CN114597977A - Application method of flexible multi-source coordinated active balance process system for thermal power - Google Patents

Application method of flexible multi-source coordinated active balance process system for thermal power Download PDF

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CN114597977A
CN114597977A CN202210269472.1A CN202210269472A CN114597977A CN 114597977 A CN114597977 A CN 114597977A CN 202210269472 A CN202210269472 A CN 202210269472A CN 114597977 A CN114597977 A CN 114597977A
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energy storage
power
frequency modulation
flywheel energy
steam
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蔡礼东
蔡祯祺
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Jilin Zhongxin Energy Service Co ltd
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Jilin Zhongxin Energy Service Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J15/00—Systems for storing electric energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J15/00—Systems for storing electric energy
    • H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to an application method of a flexible multisource coordinated active power balance process system for thermal power, which particularly comprises the following steps: setting a thermal power flexibility multi-source coordination 'active balance service' process system, wherein the system comprises a flywheel energy storage frequency modulation system, a molten salt energy storage frequency modulation system and a thermal power flexibility 'active balance' process monitoring control system; controlling a flywheel energy storage frequency modulation system to provide rotational inertia or primary frequency modulation active power balance service of a thermal power plant; a flywheel energy storage frequency modulation system and a fused salt energy storage frequency modulation system are fused with a thermal power generating unit to form a virtual frequency modulation power supply so as to provide multi-source coordination active power balance service. The method can be widely applied to the technical field of thermal power flexibility transformation active power balance service.

Description

Application method of flexible multi-source coordinated active balance process system for thermal power
Technical Field
The invention relates to an application method of an active balance process system, in particular to an application method of a thermal power flexibility multi-source coordination active balance process system, and belongs to the technical field of flywheel energy storage, fused salt energy storage, thermal power flexibility modification and manufacture, adjusting type power supplies and power system active balance service of rotational inertia, frequency modulation, peak regulation and climbing.
Background
According to the Chinese power development planning, the total installed capacity of wind power and solar power generation of renewable energy sources reaches more than 12 hundred million kilowatts in 2030 years, 13.5 hundred million kilowatts in 2035 years, new energy sources represented by wind, solar and electricity are gradually used as main power sources in China, the rapid development of the new energy power needs active balance adjusting power sources with huge capacity, and the gap of the adjusting capacity of a national power system in 2025 years is predicted to reach 2 hundred million kilowatts. However, the regulation capacity of the power system is continuously reduced along with the increase of the proportion of new energy, the thermal power generating unit is reduced along with the year-by-year reduction of the power generation load rate, and the active power balance regulation capacity of the power system is also continuously reduced and is obviously insufficient.
The national energy agency of the national reform committee, the 1519 file of national thermal power generating unit reconstruction and upgrade implementation scheme in 2021, requirement: and carrying out heat supply transformation on the thermal power generating unit, and optimizing the operation of the produced cogeneration unit. And technical transformation of the cogeneration unit is encouraged, the heat supply capacity is further improved, and the requirement of newly increased heat load is met. The flexibility manufacturing and the flexibility modification of the thermal power generating unit are continuously carried out, the technical feasibility, the economy and the operation safety are comprehensively considered, and after the flexibility modification of the thermal power generating unit in service, the minimum power generation output reaches about 30 percent of rated load; the flexibility manufacturing and the flexibility transformation of the thermal power generating unit are accelerated, and the flexibility transformation of the thermal power generating unit in service should be changed as much as possible. The general requirement of the peak regulation capacity under the pure condensation working condition is that the minimum power generation output reaches 35% of rated load, and the peak regulation capacity of the minimum power generation output reaching 40% of rated load in 6h per day is realized by the thermoelectric decoupling striving during the operation of the heating thermoelectric unit in the heating period.
At present, the flexible manufacturing and flexible modification of the thermal power generating unit are not reported in a mature scheme which is large-scale, safe, reliable, economical and applicable.
The power grid frequency essentially reflects the balance degree of power generation and load in the power system, and is one of important indexes of the operation quality and safety of the power system. The thermal power generating unit participates in active frequency modulation and mainly depends on the Automatic Generation Control (AGC) of the primary frequency modulation performance and the secondary frequency modulation of the thermal power generating unit, and the active power of the thermal power generating unit is adjusted through the AGC to achieve the aim of power grid frequency modulation scheduling. However, due to the characteristic of large thermal inertia of the coal-electric unit, the traditional thermal power unit has the problems of delay in adjustment, low climbing speed and low adjustment precision on AGC frequency modulation instructions, and the standard requirement of the power grid AGC adjustment index cannot be met when the boiler load is less than the stable combustion load output. And when the minimum power generation output of the thermal power generating unit is lower than the stable combustion load of the boiler, the primary frequency modulation capacity tends to zero, and the active power balance capacity is difficult to meet the relevant standard requirements of safe and stable operation of a power grid.
According to the reports of the energy storage network of the polaris, the total number of frequency modulation projects of the thermal power energy storage combined unit put into operation, under construction and in winning in China reaches 58 by 7 months in 2020, and the energy storage projects for assisting AGC frequency modulation of the thermal power unit in three years basically adopt the lithium iron phosphate battery energy storage process. However, the process for assisting the AGC frequency modulation of the thermal power generating unit has the following main problems:
a) thermal runaway: the electrolyte of the lithium ion battery is mostly an organic solvent, the main component is carbonate, the flash point and the boiling point are low, and the oxidation reaction is easy to occur; once leakage and other conditions occur, dangerous accidents such as battery ignition and the like are easily caused; in the manufacturing process of the lithium ion battery, a small amount of impurities such as dust and the like inevitably exist, and the impurities can easily damage the diaphragm, cause internal short circuit and cause safety accidents; in fact, the lithium battery energy storage system which runs in a large scale and a long period has the safety risks of thermal runaway and burning explosion after the thermal runaway which cannot be completely avoided; the fire-fighting measures for controlling explosion of the lithium battery energy storage system adopted at present cannot effectively prevent deep deterioration after the explosion and the combustion occur; at present, due to the characteristics of the lithium ion battery, the lithium ion battery energy storage system assisting the thermal power generating unit to perform combined frequency modulation still has no intrinsic safety, and the problem of the thermal safety of the lithium ion battery is not fundamentally solved in the application of the thermal power energy storage unit to frequency modulation;
b) does not participate in primary frequency modulation of the power grid;
c) insufficient frequency modulation energy: although the lithium battery energy storage can carry out quick charging and discharging to assist the AGC frequency modulation of the thermal power generating unit, the capability of continuously tracking an AGC frequency modulation command when the AGC adjusting power is changed in a large range is lacked;
d) the AGC frequency modulation precision adjustment of the thermal power generating unit is not involved;
e) the service life is short;
f) it is difficult to achieve unattended operation.
Disclosure of Invention
Aiming at the problems, the invention aims to provide an application method of a flexible multisource coordinated active balance process system of thermal power, which is characterized in that firstly, independent response replaces primary frequency modulation of a thermal power unit; secondly, the combined thermal power generating unit responds to the AGC frequency modulation and peak shaving of the power grid in a high quality manner; and thirdly, a thermal power generating unit is fused or a virtual frequency modulation power supply of an electric power system is independently formed to provide the services of rotational inertia, primary frequency modulation and active power balance during climbing for the power grid.
In order to realize the purpose, the invention adopts the following technical scheme:
an application method of a thermal power flexibility multi-source coordination 'active balance' process system comprises the following steps:
setting a thermal power flexibility multi-source coordination 'active balance service' process system, wherein the system comprises a flywheel energy storage frequency modulation system, a molten salt energy storage frequency modulation system and a thermal power flexibility 'active balance' process control system;
controlling a flywheel energy storage frequency modulation system to provide rotational inertia or primary frequency modulation active power balance service for a thermal power plant;
a flywheel energy storage frequency modulation system and a fused salt energy storage frequency modulation system are fused with a thermal power generating unit to form a virtual frequency modulation power supply so as to provide multi-source coordination active power balance service.
Further, the molten salt energy storage frequency modulation system comprises a molten salt electric heating device, a molten salt energy storage device and a water-molten salt-steam inversion heat exchange system containing a water-molten salt-steam inversion heat exchange device; the power supply of the molten salt electric heating device is taken from a power plant on-off bus, and the molten salt electric heating device is connected with the molten salt energy storage device through a molten salt electric heating device cold salt supply pipeline and a molten salt electric heating device hot salt return pipeline; the salt side pipeline of the water-molten salt-steam inverse transformation heat device is connected with the molten salt energy storage device through a cold salt supply pipeline of the water-molten salt-steam inverse transformation heat device, is connected with the molten salt electric heating device through a hot salt supply pipeline of the molten salt electric heating device, and is connected with the molten salt energy storage device through a hot salt return pipeline of the molten salt electric heating device after being secondarily heated by the molten salt electric heating device;
the flywheel energy storage frequency modulation system comprises a plurality of flywheel energy storage frequency modulation units which are connected in parallel, each flywheel energy storage frequency modulation unit is provided with a flywheel energy storage frequency modulation unit transformer, each flywheel energy storage frequency modulation unit is connected in parallel and connected into a flywheel energy storage frequency modulation system bus, and the flywheel energy storage frequency modulation system bus isolating switch is connected into a station-used 6kV bus; each flywheel energy storage frequency modulation unit comprises one or more groups of flywheel energy storage device array inverters PCS, the flywheel energy storage device array inverters PCS are connected with a flywheel energy storage frequency modulation unit bus through a flywheel energy storage device array inverter alternating current isolating switch, and the flywheel energy storage frequency modulation unit bus is connected with a flywheel energy storage frequency modulation unit transformer through a flywheel energy storage frequency modulation unit isolating switch; each flywheel energy storage device array inverter is connected with one or a plurality of flywheel energy storage device modules through a flywheel energy storage device array bus; each flywheel energy storage device module consists of a flywheel energy storage array management system FMS and a plurality of flywheel energy storage device modules, each flywheel energy storage device module is connected to a flywheel energy storage device array bus through a flywheel energy storage device converter direct current switch, the flywheel energy storage device array inverter PCS controls one or a plurality of flywheel energy storage array management systems FMS, the flywheel energy storage array management system FMS controls one or a plurality of flywheel energy storage device converters FCS, and each flywheel energy storage device converter FCS controls one flywheel energy storage device;
the thermal power flexibility active balance process monitoring control system is used for monitoring and controlling the flywheel energy storage frequency modulation system and the molten salt energy storage frequency modulation system; the system comprises a power grid dispatching center RTU, a power plant PMU, a thermal power generating unit DCS, a thermal power flexibility active power balance process control system DCS, a flywheel energy storage and frequency modulation energy management system EMU and a fused salt energy storage and frequency modulation control system DCS; the thermal power flexibility active balance process control system DCS is respectively connected with the power grid dispatching center RTU, the thermal power generating unit DCS, the flywheel energy storage frequency modulation energy management system EMU and the fused salt energy storage frequency modulation control system DCS; and the power plant PMU is connected with a power grid dispatching center RTU, a thermal power generating unit DCS and a flywheel energy storage frequency modulation energy management system EMU.
Further, the control of the flywheel energy storage frequency modulation system to provide power plant rotational inertia or primary frequency modulation active balance service includes:
based on power information sent by a power plant PMU, a flywheel energy storage frequency modulation system is adopted to replace a thermal power generating unit to realize primary frequency modulation active power balance service;
based on a dispatching power instruction sent by a power grid dispatching center RTU, a flywheel energy storage frequency modulation system is adopted to independently provide rotational inertia and primary frequency modulation active power balance services for a power grid.
Further, the method for realizing primary frequency modulation active power balance service by adopting a flywheel energy storage frequency modulation system to replace a thermal power generating unit based on power information sent by a power plant PMU comprises the following steps:
the flywheel energy storage frequency modulation energy management system EMU receives a PMU (power management unit) of a power plant and receives energy information of a PCS (power conversion system) of a flywheel energy storage array inverter;
the flywheel energy storage frequency modulation energy management system EMU calculates the frequency disturbance quantity according to the received power information of the PMU of the power plant, compares the frequency deviation with the target frequency, and schedules and controls the charging and discharging power of the PCS of the flywheel energy storage device array inverter;
the method comprises the following steps that a PCS (Power control System) of a flywheel energy storage device array receives a charge-discharge power instruction sent by an EMU (energy management Unit) of a flywheel energy storage frequency modulation, and schedules and controls the charge-discharge power of an FMS (frequency modulation system) of the flywheel energy storage device array;
the FMS receives a charging and discharging power control instruction sent by the flywheel energy storage device array inverter PCS, schedules and controls charging and discharging operation of the flywheel energy storage device, and achieves primary frequency modulation active power balance service.
Further, the method for independently providing the rotational inertia and primary frequency modulation active power balance service for the power grid by adopting the flywheel energy storage frequency modulation system based on the scheduling power instruction sent by the power grid scheduling center RTU comprises the following steps:
the method comprises the following steps that a power grid dispatching center RTU sends a dispatching power instruction to a flywheel energy storage frequency modulation energy management system EMU through a thermal power flexibility active power balance process control system DCS or directly;
after receiving a scheduling power instruction issued by a thermal power flexibility active balance process control system DCS or a power grid scheduling center RTU, a flywheel energy storage frequency modulation energy management system EMU schedules and controls the charging and discharging power of a flywheel energy storage device array inverter PCS;
after receiving a charging and discharging power instruction sent by a flywheel energy storage frequency modulation energy management system EMU, a flywheel energy storage device array inverter PCS schedules and controls the charging and discharging power of a flywheel energy storage device array management system FMS;
after receiving a charging and discharging power control instruction sent by a flywheel energy storage device array inverter PCS, the flywheel energy storage device array management system FMS schedules and controls charging and discharging operation of the flywheel energy storage device, and realizes that rotational inertia and primary frequency modulation active power balance services are provided for a power grid.
Further, adopt flywheel energy storage frequency modulation system, fused salt energy storage frequency modulation system to fuse thermal power generating set and constitute "virtual frequency modulation power" to provide multisource coordination "active power balance" service, include:
based on AGC (automatic gain control) regulation target power instruction information of a power grid dispatching center RTU (remote terminal Unit) and generating power state information sent by a DCS (distributed control system) of a thermal power generating unit, providing secondary frequency modulation active power balance service of a power system;
based on an AGC target power regulation instruction of a power grid dispatching center RTU, providing an active balance service of secondary frequency modulation of the power system by fusing a flywheel energy storage frequency modulation system, a flywheel energy storage frequency modulation system and/or a fused salt energy storage frequency modulation system with a thermal power generating unit;
a flywheel energy storage frequency modulation system and a fused salt energy storage frequency modulation system are fused with a thermal power generating unit to form a virtual frequency modulation power supply of a power grid, and the virtual frequency modulation power supply provides power system rotational inertia, frequency modulation, climbing, deep peak shaving or APC (active power balance) services.
Further, the method for providing the secondary frequency modulation active power balance service of the power system based on the AGC power instruction information of the power grid dispatching center RTU and the generating power state information sent by the thermal power generating unit DCS comprises the following steps:
the method comprises the steps that a thermal power flexibility active balance process control system DCS receives AGC power instruction information sent by a power grid dispatching center RTU and generating power state information sent by a thermal power unit DCS;
the process control system DCS for thermal power flexibility ' active balance ' analyzes and dispatches and controls the operation of power generation and power utilization ' of the process system DCS for thermal power flexibility ' active balance ' according to the stored energy and the operation state of the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system, the AGC frequency modulation dynamic performance information in the thermal power unit DCS, and the AGC power instruction sent by the power grid dispatching center RTU in real time.
Further, the method for providing the secondary frequency modulation active power balance service of the power system by fusing a flywheel energy storage frequency modulation system, a flywheel energy storage frequency modulation system and/or a molten salt energy storage frequency modulation system with a thermal power generating unit based on the AGC target power regulation instruction of the power grid dispatching center RTU comprises the following steps:
when the AGC adjustment target power of the RTU of the power grid dispatching center is less than (the real-time frequency modulation power of the flywheel energy storage frequency modulation system + the basic adjustment rate of the unit is multiplied by the rated power of the unit), the flywheel energy storage frequency modulation system is adopted to fuse the thermal power unit to realize the AGC adjustment target power instruction;
when the AGC (automatic gain control) target power of the RTU (real-time frequency modulation power of the flywheel energy storage frequency modulation system + basic set regulation rate x set rated power) of the power grid dispatching center, fusing a thermal power unit with the flywheel energy storage frequency modulation system and the molten salt energy storage frequency modulation system to realize the AGC target power regulation instruction.
Further, the method for realizing the target power instruction of AGC by fusing the flywheel energy storage frequency modulation system with the thermal power generating unit comprises the following steps:
determining the adjusting rate of the full-load adjusting range of the thermal power generating unit;
determining the percentage of the remaining electric quantity of the SOC energy storage system of the flywheel energy storage frequency modulation system;
controlling the thermal power generating unit to respond to an AGC (automatic gain control) regulation target power instruction of a power grid dispatching center RTU (remote terminal Unit) according to self capacity;
the method comprises the following steps that a flywheel energy storage frequency modulation energy management system EMU sequentially schedules and controls a flywheel energy storage device array inverter PCS, a flywheel energy storage device array management system FMS, a flywheel energy storage device converter FCS and a flywheel energy storage device to adjust the running of electric power for generation according to the difference between an AGC (automatic gain control) adjustment target power instruction of a power grid scheduling center RTU and the real-time generating power of a thermal power generating unit DCS read by an active balance process control system DCS;
the array bus voltage of the flywheel energy storage device runs at a constant voltage within a rated parameter range, the charge-discharge multiplying power of the flywheel energy storage device is less than 2C, and C is the capacity of the flywheel energy storage device;
and when the output power of the thermal power generating unit meets an AGC (automatic gain control) target power instruction of a power grid dispatching center RTU (remote terminal Unit), adjusting the flywheel energy storage frequency modulation system to stop the output power, and keeping 50 +/-5% of SOC (state of charge) for standby operation.
Further, the method for realizing the AGC target power regulation instruction by fusing the flywheel energy storage frequency modulation system and the molten salt energy storage frequency modulation system with the thermal power generating unit comprises the following steps:
if the molten salt electric heating device is in the running state, the following steps:
when the difference between the accumulated on-grid power and the AGC (automatic gain control) target power of the grid dispatching center RTU is adjusted by the flywheel energy storage frequency modulation system combined with the thermal power generating unit and is less than or equal to the power adjusting capacity of the molten salt electric heating device in the running state, the control method comprises the following steps: determining that the flywheel energy storage frequency modulation system and the thermal power generating unit are combined to adjust the accumulated grid power and operate in a saturated state; taking the fused salt electric heating device as a controllable load, and adjusting the accumulated output power of the fused salt electric heating device, combined with a flywheel energy storage frequency modulation system and a thermal power generating unit to reach the AGC adjustment target power of a power grid dispatching center RTU;
when the difference between the accumulated on-grid power and the AGC (automatic gain control) target power of the grid dispatching center RTU is larger than the power regulation capability of the molten salt electric heating device in the running state by combining the flywheel energy storage frequency modulation system with the thermal power generating unit, the control method comprises the following steps: determining that the flywheel energy storage frequency modulation system and the fused salt electric heating device are combined with the thermal power generating unit to adjust the accumulated on-grid power and operate in a saturated state; and taking the water-molten salt-steam inversion heat exchange system as a controllable load, and adjusting the accumulated output power of the water-molten salt-steam inversion heat exchange system, the thermal power generating unit combined flywheel energy storage frequency modulation system and the molten salt electric heating device to reach the AGC (automatic gain control) adjustment target power of the RTU (remote terminal unit) of the power grid dispatching center.
If the molten salt electric heating device is in a non-operation state, the following steps:
when the AGC target power regulation instruction of the RTU of the power grid dispatching center is continuously increased in a single direction, controlling a water-molten salt-steam inversion heat exchange system to operate for a plant/industrial steam system, and reducing steam extraction of a steam turbine to increase the power generation power; meanwhile, a water-molten salt-steam inversion heat exchange system is controlled to be operated by a main steam system, and the steam inlet flow of main steam of the steam turbine is increased to increase the power generation power;
and when the AGC target power regulation instruction of the RTU of the power grid dispatching center is continuously reduced in a single direction, controlling the water-molten salt-steam inversion heat exchange system to store the molten salt.
Further, a flywheel energy storage frequency modulation system and a fused salt energy storage frequency modulation system are adopted to fuse a thermal power generating unit to form a power grid virtual frequency modulation power supply, and the method for providing the services of rotational inertia, frequency modulation, climbing and APC peak regulation active power balance comprises the following steps:
the thermal power flexibility 'active balance' process control system DCS uploads the energy storage capacity related information of a flywheel energy storage frequency modulation energy management system EMU and a fused salt energy storage frequency modulation control system DCS to a power grid dispatching center RTU;
the method comprises the following steps that a power grid dispatching center RTU issues an instruction to a thermal power flexibility active balance process control system DCS, and the thermal power flexibility active balance process control system DCS coordinates the operation of a thermal power unit DCS, a dispatching flywheel energy storage frequency modulation energy management system EMU and a molten salt energy storage frequency modulation control system DCS;
the target power increasing direction adjustment sequence is as follows: the energy storage and frequency modulation system of the flywheel is in discharge operation, the fused salt energy storage and frequency modulation control system controls the load shedding operation of the fused salt electric heating device, and the fused salt energy storage device releases heat to cooperate with the water-fused salt-steam inversion heat exchange system to supply auxiliary main steam to the steam turbine for power generation operation and plant use/industrial steam heat supply operation;
the target power reduction adjustment sequence is: the flywheel energy storage frequency modulation system is in discharge operation, the fused salt energy storage frequency modulation system controls the fused salt electric heating device to carry out load shedding operation, and the fused salt energy storage device cooperates with the water-fused salt-steam inversion heat exchange system to assist the steam turbine to carry out main steam power generation operation and plant/industrial steam heat supply operation.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) the power type flywheel energy storage frequency modulation system is adopted to replace a thermal power generating unit to respond to the primary frequency modulation of a power grid and assist the AGC frequency modulation of the thermal power generating unit, the 'active balance' performance quality is good, the standard is high, and the flywheel energy storage frequency modulation system has a qualitative breakthrough in the aspects of intrinsic safety of equipment, power scale, operation controllability, life cycle cost and the like compared with the AGC frequency modulation of the electrochemical battery energy storage auxiliary thermal power generating unit, and is specifically embodied in that:
a) the charge-discharge operation multiplying power is more than or equal to 2C: the rotational inertia and primary frequency modulation active power balance capability of the thermal power generating unit and the new energy source unit are strong;
b) the control precision is high: the dispatching and adjusting precision of the power grid AGC can be controlled to be not higher than 0.5 percent of the rated power of the unit or not higher than the AGC command power plus or minus 0.5 MW;
c) life cycle cost is low: the service life of the flywheel energy storage system is more than 20 years, and is the same as that of main equipment of the thermal power generating unit.
d) Do benefit to intelligent management and control: unattended operation, accurate control, intelligent management and control and intelligent operation can be implemented through datamation and networking.
(2) Electric heating molten salt and molten salt heat storage are used as controllable load response power grid AGC scheduling, and the frequency modulation, peak regulation, climbing and active power balance adjusting range is large.
The molten salt electric heating device has the capability of quickly adjusting power and can be used as a controllable load combined thermal power generating unit for AGC frequency modulation and peak shaving.
(3) The 'fused salt energy storage and frequency modulation system' is applied to fuse the thermal power generating unit to absorb and release heat through fused salt, the steam supply amount of the thermal power generating unit is reduced or increased to serve as a controllable load to respond to the AGC scheduling of the power grid, and the system is large in frequency modulation, peak regulation, slope climbing and 'active power balance' power regulation range and good in economical efficiency.
The molten salt has the advantages of wide liquid temperature range, high heat storage and release, high heat transfer coefficient, low viscosity, high use temperature and the like, and the molten salt is in a liquid state in the whole heat storage and release process, and has the advantages of accurate and adjustable heat release temperature and the like.
(4) Flywheel energy storage, electric heating molten salt, molten salt heat storage and a 'water-molten salt-steam inverse heat conversion device' are applied to heat exchange and fusion of a thermal power generating unit and steam flow regulation multiple combination to form a novel 'regulation type power supply' of a power grid.
In conclusion, the thermal power flexibility multi-source coordination 'active balance' process system provided by the invention responds to the requirements of power grid rotational inertia, frequency modulation, deep peak regulation, climbing and active balance scheduling regulation by applying a flywheel energy storage frequency modulation system, a molten salt electric heating device, a molten salt energy storage device and a 'water-molten salt-steam inversion heat exchange system' combined thermal power generating unit; a flywheel energy storage frequency modulation system, a molten salt electric heating device, a molten salt energy storage device and a water-molten salt-steam inversion heat exchange system are combined with steam flow regulation of a thermal power generating unit to form a virtual frequency modulation power supply of a power system, and the virtual frequency modulation power supply is directly subjected to automatic power control and scheduling of a power grid APC (automatic Power control) and provides services of rotational inertia, frequency modulation, peak regulation and climbing active balance for the power system. Therefore, the invention can be widely applied to the technical fields of flywheel energy storage, fused salt energy storage, thermal power flexibility transformation and manufacturing, adjusting type power supply and power system active balance service, such as 'rotational inertia, frequency modulation, peak shaving and climbing'.
Drawings
FIG. 1 is a topological diagram of a thermal power flexibility multi-source coordinated active balance process system provided by an embodiment of the invention;
fig. 2 is a topology diagram of a flywheel energy storage primary frequency modulation and AGC frequency modulation process system of an auxiliary thermal power generating unit according to an embodiment of the present invention;
fig. 3 is a topological diagram of an AGC frequency modulation and deep peak shaving process system of a fused salt energy storage auxiliary thermal power generating unit according to an embodiment of the present invention;
fig. 4 is a comparison graph of the primary frequency modulation effect of the thermal power generating unit-flywheel energy storage provided by an embodiment of the invention;
the reference numerals in the figures are as follows:
1. a power grid dispatching center RTU (remote Terminal Unit), which is called a remote Terminal control system in Chinese;
2. a power grid;
3. a power plant on-off bus; 3-1, a power plant and a power plant switching bus; 3-2, a power plant and a power plant switching bus;
4. a power plant on-off bus coupler switch;
5. PMU (phasor Unit) of power plant, wherein the Chinese name is totally called phasor Measurement unit;
6. DCS (distributed Control systems) of thermal power generating units, wherein Chinese is called a distributed Control system;
7. the fused salt electric heating device supplies power to the transformer;
8. a turbo generator unit;
9. a turbine generator outlet transformer;
10. a service transformer;
11. 6kV factory bus; 11-1, a section 1A of a factory 6kV bus; 11-2, a section 1B of a factory 6kV bus;
12. a factory 6kV bus isolating switch; 12-1, isolating switches of 1A section of a factory 6kV bus; 12-2, a station 6kV bus 1B section isolating switch;
13. a factory 6kV bus interconnection switch;
flywheel energy storage frequency modulation system
14. A flywheel energy storage frequency modulation system bus;
15. a bus isolating switch of the flywheel energy storage frequency modulation system; 15-1, disconnecting a bus of the flywheel energy storage frequency modulation system from a 1A section of the station-used 6kV bus, and 15-2, disconnecting a bus of the flywheel energy storage frequency modulation system from a 1B section of the station-used 6kV bus;
16. a flywheel energy storage frequency modulation system unit transformer;
17. the thermal power flexibility is an 'active balance' process control system DCS;
18. flywheel energy storage frequency modulation energy management system emu (electric multiple units);
19. a molten salt energy storage frequency modulation control system DCS;
20. the flywheel energy storage frequency modulation system unit is used for an electric isolating switch;
21, flywheel energy storage frequency modulation system unit bus;
22. a flywheel energy storage device array bus;
23. flywheel energy storage device array inverter PCS;
24. flywheel energy storage array Management system fms (flywheel Management system);
25. flywheel energy storage converter fcs (flywheel Conversion system);
26. a flywheel energy storage device;
molten salt electric heating device:
27. a molten salt electric heater;
28. the fused salt electric heating device supplies power to the transformer inlet switch;
29. the fused salt electric heating device is provided with an electric isolating switch;
30. a fused salt electric heater power supply isolating switch;
fused salt energy storage device
31. A cold salt tank;
32. a hot salt tank;
33. a cold salt pump;
34. a cold salt pump feeds a salt door;
35. the molten salt electric heating device is provided with a cold salt-supplying isolating door;
36. a 'water-molten salt-steam inverse heat transfer device' is used for cooling salt and feeding salt to a salt isolating door;
37. a 'water-molten salt-steam inverse heat conversion device' is provided with a cold salt return isolating door;
38. the molten salt electric heating device is provided with a cold salt feeding pipeline, namely a three-way connector of a cold salt pump feeding salt door outlet pipeline is connected to a cold salt inlet pipeline connector of the molten salt electric heating device;
39. the 'water-molten salt-steam inverse transformation heat device' is a cold salt supply pipeline, namely a pipeline between a three-way connector of a cold salt pump salt door outlet pipeline and a cold salt inlet pipeline connector of the 'water-molten salt-steam inverse transformation heat device';
40. a cold salt return pipeline of the water-molten salt-steam inverse transformation heat device is connected from a cold salt outlet pipeline interface of the water-molten salt-steam inverse transformation heat device to a cold salt tank inlet pipeline interface;
41. the cold salt pump is used for supplying salt to the outlet pipeline tee joint of the salt door;
42. the cold salt tank is used for supplying (supplying) salt, namely a pipeline from a cold salt pump inlet pipeline to a cold salt pump salt supply door outlet pipeline tee joint;
43. a hot salt pump;
44. the hot salt pump is discharged to the salt gate;
45. a salt return door of the hot salt tank;
46. a hot salt return pipeline of the molten salt electric heating device, namely a pipeline between a hot salt outlet pipeline interface of the molten salt electric heating device and a hot salt inlet pipeline interface of a hot salt tank;
47. "water-molten salt-steam inverse heat exchanger";
48. a 'water-molten salt-steam inverse heat transfer device' is a hot salt outlet isolating door;
49. a hot salt supply pipeline of the molten salt electric heating device, namely a hot salt outlet pipeline interface of the 'water-molten salt-steam inverse transformation heat device' is connected to a hot salt inlet pipeline interface of the molten salt electric heating device;
50. a hot salt tank is connected with a salt supply pipeline, namely an outlet port of a hot salt pump outlet salt supply door 44 is connected with a hot salt inlet pipeline of a water-molten salt-steam inverse heat transfer device;
51. a hot salt feeding isolation door of the molten salt electric heating device;
52. a boiler;
53. 53-1 parts of a steam turbine, 53-2 parts of a high-pressure steam turbine cylinder, 53-3 parts of a medium-pressure steam turbine cylinder and a low-pressure steam turbine cylinder;
54. a turbine high pressure bypass valve;
55. an outlet isolation door of the high-pressure bypass valve of the steam turbine;
56. a high pressure bypass steam supply isolation door;
57. a steam turbine admission regulating gate; 57-1, a steam turbine high-pressure cylinder steam inlet adjusting valve, 57-2, a steam turbine intermediate pressure cylinder steam inlet adjusting valve and 57-3, a steam turbine low-pressure cylinder steam inlet adjusting valve;
58. a steam turbine high pressure heater water supply system;
59. a low-pressure water supply pump of a water-molten salt-steam inverse heat conversion device;
60. a low-pressure water supply isolation door of a water-molten salt-steam inverse heat conversion device;
61. an outlet isolation door of the high-pressure feed water pump of the boiler;
62. a high-pressure water supply inlet isolating door of a water-molten salt-steam inverse heat conversion device;
63. a 'water-hot salt-steam inverse heat transfer device' is a drainage isolation door;
64. a 'water-hot salt-steam inverse heat transfer device' drainage regulating gate;
65. a boiler feed pump deoxygenation water supply pipeline, namely an outlet pipeline of a boiler feed water deoxygenator to an inlet pipeline of a boiler feed pump;
66. the low-pressure feed pump deoxygenation water supply pipeline of the 'water-molten salt-steam inverse transformation heat device', namely an outlet pipeline interface of a boiler feed water deoxygenator is connected to an inlet pipeline interface of the low-pressure feed pump of the 'water-molten salt-steam inverse transformation heat device';
67. a high-pressure water supply pipeline of the 'water-molten salt-steam inverse transformation heat device', namely a three-way 95 connector of the high-pressure water supply pipeline of the boiler of the water-molten salt-steam inverse transformation heat device is connected to a water supply inlet pipeline connector of the water-molten salt-steam inverse transformation heat device;
68. a low-pressure water supply pipeline of the 'water-molten salt-steam inverse transformation heat device', namely a water-molten salt-steam inverse transformation heat device low-pressure water supply pump outlet pipeline interface is connected to a water-molten salt-steam inverse transformation heat device water supply inlet pipeline interface;
69. a drain pipeline of the water-molten salt-steam inverse transformation heat device is a drain outlet pipeline interface of the water-molten salt-steam inverse transformation heat device to a main bypass pipeline interface and a reheat steam drain inlet pipeline interface of a boiler feed water deaerator;
70. a steam inlet isolation door of a high-pressure bypass valve of the steam turbine;
71. the steam turbine assists the main steam high-pressure bypass pipeline to enter the steam isolating door;
72. a steam inlet isolation door of a low-pressure bypass valve of the steam turbine;
73. an isolation door of a steam extraction pipeline of a reheating hot section of the bypass steam turbine;
74. a main steam extraction pressure regulating valve of the bypass steam turbine;
75. an outlet isolation door of the low-pressure bypass valve of the steam turbine;
76. the 'water-molten salt-steam inverse heat conversion device' is used for a plant/industrial steam pipeline isolation door;
77. a water-molten salt-steam inverse heat conversion device is a steam temperature reduction plant/industrial steam isolation door;
78. the 'water-molten salt-steam inverse heat-exchanging device' is used for a plant/industrial steam check valve;
79. a water-molten salt-steam inverse heat-exchanging device is arranged in a steam inlet main pipe;
80. an auxiliary main steam supply pipeline, a water-molten salt-steam inverse transformation heat device and an auxiliary main steam pipeline interface are connected to a three-way interface of a high-pressure bypass auxiliary main steam inlet pipeline of the steam turbine;
81. the water-molten salt-steam inverse transformation heat device bypasses a main steam extraction pipeline of the steam turbine, and bypasses a tee joint of the main steam extraction pipeline of the steam turbine to an inlet pipeline joint of a steam inlet main pipe of the water-molten salt-steam inverse transformation heat device;
82. a bypass steam turbine reheating thermal section steam extraction pipeline, a pipeline between a three-way connector of the steam turbine reheating thermal section steam extraction pipeline and a steam inlet main pipe connector of a water-molten salt-steam inverse heat conversion device;
83. the steam temperature-reducing supply plant/industrial steam pipeline, the 'water-molten salt-steam inverse heat-transfer device' is internally provided with a steam temperature reducer steam outlet pipeline interface to a pipeline between a molten salt heat release and steam temperature-reducing supply plant/industrial steam pipeline tee joint;
84. the molten salt heat release supply plant/industrial steam pipeline, the 'water-molten salt-steam inverse transformation heat exchange device' is used for supplying plant/industrial steam pipeline interfaces to the pipeline between the plant/industrial steam supply pipeline interfaces;
85. a turbine low pressure bypass valve;
86. a boiler feed water deaerator;
87. a boiler feed pump;
88. the 'water-molten salt-steam inverse heat conversion device' is used for providing an auxiliary main steam isolation door;
89. a water-molten salt-steam inverse heat conversion device is used for separating a steam inlet main pipe;
90. the high-pressure bypass of the steam turbine assists the tee joint of the main steam admission pipeline;
91. a bypass steam turbine main steam extraction pipeline bypasses a steam turbine main steam extraction pipeline tee joint;
92. a check valve of a steam extraction pipeline of a reheating hot section of the bypass steam turbine;
93. a steam extraction pipeline tee joint of a reheating thermal section of the steam turbine;
94. the fused salt heat release and steam temperature reduction supply plant/industrial steam pipeline tee joint;
95. a boiler high-pressure water supply pipeline tee joint of a water-molten salt-steam inverse heat transfer device;
96. a pipeline between a main steam supply pipeline of the steam turbine and a main steam outlet of the boiler and a steam inlet regulating valve interface of a high-pressure cylinder of the steam turbine;
97. a tee joint of a steam pipeline from main steam to a high-pressure bypass of the steam turbine;
98. a steam pipeline of a reheating thermal section of the steam turbine and a pipeline at an outlet of a boiler reheater are respectively connected to a pipeline between a steam inlet regulating valve interface of a steam turbine intermediate pressure cylinder and a low-pressure bypass valve interface of the steam turbine;
99. the high-pressure bypass steam pipeline of the steam turbine, the pipeline between the tee joint of the main steam and high-pressure bypass steam pipeline of the steam turbine and the outlet isolation door interface of the high-pressure bypass valve of the steam turbine;
100. the steam turbine low pressure bypasses the steam pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "axial", "circumferential", "lateral", "vertical", "inlet", "outlet", "feed", "return", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. In addition, the terms "inlet", "outlet", "feed", "return", "front" and "rear" are used to define the components, such as "first" and "second", for the sake of convenience only to distinguish the components, and unless otherwise stated, the terms have no special meaning, and are not to be construed as indicating or implying any relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "assembled", "disposed" and "connected" are to be construed broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is particularly explained that the pipelines are connected with the pipeline as a fixed connection point in the corresponding system instead of the corresponding system because the capacity, the coal type and the thermodynamic system parameters of the thermal power generating unit are different. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in more detail with reference to the accompanying drawings.
The "active balance" includes frequency modulation, peak shaving, climbing, rotational inertia, standby and other power assisting services, which are clear in the notice of the national energy supply agency "national energy and administration regulation of national energy (2021) No. 60" Power assisting service management method "in 12 months and 21 days in 2021. Wherein:
1) frequency modulation
The frequency modulation means that when the frequency of the power system deviates from a target frequency, the grid-connected main body adjusts the active power output by means of a speed regulation system, automatic power control and the like, and the service provided by reducing the frequency deviation is provided. The frequency modulation is divided into primary frequency modulation and secondary frequency modulation. The primary frequency modulation is the service provided by the conventional unit for adjusting the active power output and reducing the frequency deviation through the automatic response of the speed regulation system, the fast frequency response of the grid-connected main bodies of new energy, energy storage and the like when the frequency of the power system deviates from the target frequency. The secondary frequency modulation refers to a service that a grid-connected main body tracks an instruction issued by an electric power dispatching mechanism through an automatic power control technology, including Automatic Generation Control (AGC), Automatic Power Control (APC) and the like, and adjusts electric power for generation in real time according to a certain adjusting rate so as to meet the requirements of frequency and power control of a tie line of an electric power system.
2) Peak regulation
The peak shaving refers to a service provided for tracking peak-valley change of a load of the power system and output change of renewable energy, and adjusting the generated electric power or starting and stopping equipment by the grid-connected main body according to an instruction issued by the power dispatching mechanism.
3) Climbing slope
The climbing refers to that the net load of the system changes greatly in a short time due to uncertain factors such as power generation fluctuation of renewable energy sources, and a grid-connected main body with a high load regulation rate regulates output according to an instruction issued by a power dispatching mechanism so as to maintain the service provided by power balance of a power system.
4) Moment of inertia
The moment of inertia is that when the power system is disturbed, the grid-connected main body provides quick positive damping responding to the frequency change rate of the power system according to the inertia characteristic of the grid-connected main body, and the service provided by sudden frequency change of the power system is prevented.
Next, the flywheel energy storage frequency modulation system provided by the embodiment of the invention is subjected to primary frequency modulation by combining with the attached drawing; the method is characterized in that flywheel energy storage, a molten salt electric heating device, molten salt heat storage and a water-molten salt-steam inverse conversion heat device are used for fusing steam flow regulation of a thermal power system of a thermal power unit, and the thermal power unit is converted from an energy type power supply into a regulation type power supply; a flywheel energy storage, a molten salt electric heating device, a molten salt heat storage and water-molten salt-steam inverse transformation heat device are fused with a steam flow regulation multi-element combination of a thermal power generating unit to form a virtual frequency modulation power supply of a power system, and a process system of rotary inertia, frequency modulation, peak regulation and slope climbing active balance except for standby is provided for a new energy source unit in a power grid for detailed description.
Example 1
As shown in fig. 1 to fig. 3, the thermal power flexibility multi-source coordination "active balance" process system provided by this embodiment includes a flywheel energy storage frequency modulation system, a molten salt energy storage frequency modulation system, and a thermal power flexibility "active balance" process monitoring control system;
wherein, a charging and discharging circuit of the flywheel energy storage frequency modulation system is connected with a 6kV bus 11 for a unit factory;
the fused salt energy storage frequency modulation system comprises a fused salt electric heating device, a fused salt energy storage device and a water-fused salt-steam inversion heat exchange system containing a water-fused salt-steam inverse heat exchange device; the power supply of the molten salt electric heating device is taken from a power plant on-off bus 3, is connected with a cold salt tank 31 of the molten salt energy storage device through a cold salt supply pipeline 38 of the molten salt electric heating device, and is respectively connected with a water-molten salt-steam inverse transformation heat device 47 and a hot salt tank 32 of the molten salt energy storage device through a hot salt supply pipeline 49 of the molten salt electric heating device and a hot salt return pipeline 46 of the molten salt electric heating device; the salt side pipeline of the water-molten salt-steam inverse transformation heat device 47 is also connected with the hot salt tank 32 through a hot salt supply pipeline 50 of the water-molten salt-steam inverse transformation heat device; the cold salt supply pipeline 39 is connected with the cold salt tank 31 through a water-molten salt-steam inverse transformation heat device, and the cold salt return pipeline 40 is connected with the cold salt tank 31 through a water-molten salt-steam inverse transformation heat device.
The thermal power flexibility active balance process monitoring and control system is used for controlling the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system, and realizing active balance service for a thermal power unit or a power system.
In the foregoing embodiment, preferably, as shown in fig. 2, an electrical system of the flywheel energy storage frequency modulation system is connected to a plant service 6kV bus 11 of the thermal power plant, and a flywheel energy storage frequency modulation system bus 14 and a flywheel energy storage frequency modulation system bus isolating switch 15 are arranged between the electrical system of the flywheel energy storage frequency modulation system and the plant service 6kV bus 11.
In the above embodiment, preferably, the other side of the plant 6kV bus 11 is connected to the power grid 2 through the plant 6kV bus isolating switch 12, the plant transformer 10, the turbo generator unit outlet transformer 9, and the plant switch plant bus 3.
In the above embodiment, preferably, the flywheel energy storage frequency modulation system includes a plurality of flywheel energy storage frequency modulation units connected in parallel, each flywheel energy storage frequency modulation unit is provided with a flywheel energy storage frequency modulation unit transformer 16, each flywheel energy storage frequency modulation unit is connected in parallel to access a flywheel energy storage frequency modulation system bus 14, and is connected to the plant 6kV bus 11 through a flywheel energy storage frequency modulation system bus isolating switch 15;
each flywheel energy storage frequency modulation unit comprises one or a plurality of groups of flywheel energy storage device array inverters PCS 23, the flywheel energy storage device array inverters PCS 23 are connected with a flywheel energy storage frequency modulation unit bus 21 through a flywheel energy storage device array inverter alternating-current isolating switch, and the flywheel energy storage frequency modulation unit bus 21 is connected with a flywheel energy storage frequency modulation unit transformer 16 through a flywheel energy storage frequency modulation unit isolating switch 20;
each flywheel energy storage device array inverter PCS 23 is also connected with one or a plurality of flywheel energy storage device modules through a flywheel energy storage device array bus 22; each flywheel energy storage device module consists of a flywheel energy storage array management system FMS 24 and a plurality of flywheel energy storage device modules, each flywheel energy storage device module is connected to a flywheel energy storage device array bus 22 through a flywheel energy storage device converter direct current switch, and each flywheel energy storage device module comprises a flywheel energy storage device converter FCS 25 and a flywheel energy storage device 26; the flywheel energy storage array inverter PCS 23 controls one or several flywheel energy storage array management systems FMS 24, the flywheel energy storage array management system FMS 24 controls one or several flywheel energy storage device converters FCS 25, each flywheel energy storage device converter FCS 25 controls one flywheel energy storage device 26.
In the above embodiment, preferably, as shown in fig. 3, the molten salt electric heating apparatus is provided with a molten salt electric heating apparatus power supply system and a molten salt electric heater 27. The power supply system of the molten salt electric heating device comprises a power plant switch plant bus power supply isolating switch 28, a molten salt electric heating device power supply transformer 7, a molten salt electric heating device power supply transformer power supply isolating switch 29 and a molten salt electric heater power supply isolating switch 30 which are sequentially connected, and the power supply of the molten salt electric heating device power supply transformer 7 is taken from a power plant switch plant bus 03; the molten salt electric heater 27 is connected with a molten salt electric heater power supply isolating switch 30.
In the above embodiment, preferably, the molten salt energy storage device includes the cold salt tank 31 and the hot salt tank 32, and the cold salt tank salt supply pipeline 42 of the cold salt tank 31 is provided with the cold salt pump 33 and the cold salt supply door 34; the salt supply pipeline of the hot salt tank 32 is provided with a hot salt pump 43 and a hot salt pump salt supply door 44. The cold salt of the cold salt tank 31 is respectively connected with a cold salt supply pipeline 38 of the molten salt electric heating device and a cold salt supply pipeline 39 of the water-molten salt-steam inverse transformation device by a cold salt pump 33, a cold salt pump salt supply door 34 and a cold salt pump salt supply door outlet pipeline tee 41; the salt return pipeline 40 of the cold salt tank 31 is connected from a cold salt outlet pipeline interface of a water-molten salt-steam inverse heat exchanger to a cold salt tank inlet pipeline interface, and a cold salt tank salt return door 37 is arranged on the cold salt tank pipeline interface; the hot salt tank 32 is provided with a hot salt pump 43 and a hot salt pump outlet salt feeding door 44 on the hot salt feeding pipeline, and the hot salt pump outlet salt feeding door is connected with a hot salt tank salt feeding (supplying) pipeline 50; the hot salt return pipeline 46 of the hot salt tank 32 is the hot salt return pipeline of the molten salt electric heating device.
Specifically, the cold salt supply system of the molten salt electric heating device: including cold salt jar 31, and supply salt pipeline 38 to insert pipeline and equipment between the fused salt electric heating device through cold salt jar by cold salt jar 31 through cold salt jar and supply salt pipeline 42 connection fused salt electric heating device, and be provided with cold salt pump 33 on the cold salt jar supplies salt pipeline 42, the cold salt pump gives salt door 34, cold salt pump gives salt door outlet pipeline tee bend 41, is provided with cold salt on the fused salt electric heating device cold salt supplies salt pipeline 38 and gives salt isolating door 35.
The hot salt supply system of the molten salt electric heating device comprises: the system comprises a 'water-molten salt-steam inverse transformation heat device' 47 and pipeline equipment which is connected between the molten salt electric heating devices through a molten salt electric heating device hot salt supply pipeline 49, wherein a 'water-molten salt-steam inverse transformation heat device' hot salt outlet isolation door 48 and a molten salt electric heating device hot salt supply isolation door 51 are arranged on the molten salt electric heating device hot salt supply pipeline 49.
The hot salt return system of the molten salt electric heating device comprises: comprises a molten salt electric heating device and a hot salt return pipeline 46 of the molten salt electric heating device, which enters a hot salt tank 32, wherein a hot salt tank return door 45 is arranged on the hot salt return pipeline 46.
In the above embodiment, preferably, the water-molten salt-steam inversion heat exchange system includes a molten salt heat storage auxiliary peak regulation system and a molten salt heat release auxiliary peak regulation system in addition to the "water-molten salt-steam inversion heat exchange device" 47 having two heat exchange functions of molten salt heat release and heat absorption; the molten salt heat storage auxiliary peak regulation system comprises a bypass turbine main steam pressure reduction steam supply system, a bypass turbine reheating heat section steam extraction system, a steam temperature reduction plant supply/industrial steam system and a 'water-molten salt-steam inverse transformation heat device' drainage system; the molten salt heat release auxiliary peak regulation system comprises a high-pressure water supply system of a 'water-molten salt-steam inverse transformation heat device', a molten salt heat release main steam supply system, a molten salt heat release plant/industrial steam supply system and a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply system.
Wherein, the "water-molten salt-steam reverse heat transfer device" 47: the salt side pipeline is connected with the fused salt energy storage device and the fused salt electric heating device, and the steam side pipeline is respectively connected with a bypass turbine main steam pressure-reducing steam supply system, a bypass turbine reheating thermal section steam extraction system, a steam temperature-reducing plant supply/industrial steam system, a fused salt heat-releasing plant supply main steam system and a fused salt heat-releasing plant supply/industrial steam system; the water side pipeline is respectively connected with a high-pressure water supply system of a water-molten salt-steam inverse transformation heat device, a low-pressure water supply system of a water-molten salt-steam inverse transformation heat device and a drainage system of a water-molten salt-steam inverse transformation heat device;
the main steam pressure-reducing steam supply system of the bypass turbine and the steam extraction system of the reheating heat section of the bypass turbine are matched with a water-molten salt-steam inverse heat conversion device 47, so that the purposes of heat absorption and heat storage of molten salt and steam temperature reduction for plant/industrial steam are achieved, and the heat supply capacity and peak regulation amplitude of a unit are increased;
the bypass steam turbine main steam pressure reduction steam supply system, the bypass steam turbine reheating hot section steam extraction system, the 'water-molten salt-steam inverse transformation heat device' drainage system and the 'water-molten salt-steam inverse transformation heat device' 47 are matched for realizing molten salt heat absorption and heat storage and unit deep peak regulation;
the existing boiler high-pressure water supply system, the 'water-molten salt-steam inverse transformation heat device' high-pressure water supply system, the molten salt heat release main steam supply system and the 'water-molten salt-steam inverse transformation heat device' 47 are matched for realizing the heat release of the molten salt and the economic operation of a unit;
the low-pressure water supply system and the industrial steam system of the 'water-molten salt-steam inverse heat transfer device' are matched with the 'water-molten salt-steam inverse heat transfer device' 47, and the low-pressure water supply system and the industrial steam system are used for realizing molten salt heat transfer, increasing the heat supply capacity and peak regulation amplitude of a unit and realizing economic operation of the unit.
In the above embodiment, preferably, the water-molten salt-steam inverse heat transfer device 47 is internally provided with a steam desuperheater, a condenser and a drain cooler which are connected in sequence, and is used for realizing a forward molten salt heat absorption and exchange function; the water supply preheater, the steam generator and the steam superheater are sequentially connected and used for realizing the heat release and heat exchange function of the inverse molten salt.
In the above embodiment, preferably, the bypass turbine main steam decompression steam supply system includes: a high-pressure bypass steam pipeline tee joint (97) arranged between an existing boiler (52) of the thermal power generating unit and a main steam pipeline (96) of a steam supply turbine, steam of the steam turbine main steam enters a steam turbine high-pressure bypass steam pipeline (99) and a steam turbine high-pressure bypass valve steam inlet isolating door (70) arranged on the steam turbine high-pressure bypass steam pipeline tee joint (97) from the other end of the steam turbine main steam to the other end of the steam turbine high-pressure bypass steam pipeline tee joint (97) through a steam turbine high-pressure bypass auxiliary main steam inlet pipeline tee joint (90), a bypass steam extraction pipeline (81) of a water-molten salt-steam inverse transformation heat device led out of the bypass steam extraction pipeline tee joint (91) is arranged at the tail end of the steam turbine high-pressure bypass steam pipeline (99) and connected to a pipeline interface (79) of a water-molten salt-steam inverse transformation heat device (47), and the bypass steam supply isolating door (56) and the water-molten salt-steam inverse transformation heat device are arranged on the bypass steam extraction pipeline (81) of the bypass steam turbine main steam extraction pipeline (81), The other end of the bypass turbine main steam extraction pipeline tee joint 91 is connected with the existing turbine high-pressure bypass valve 54 and the high-pressure bypass valve outlet isolation door 55, and the other end of the existing turbine main steam pipeline 96 is connected with the boiler 52 through the turbine main steam to the high-pressure bypass steam pipeline tee joint 97.
In the above embodiment, preferably, the bypass steam turbine reheat hot section steam extraction system includes: an existing steam turbine reheating section steam pipeline 98 led out from a boiler 52 is connected with a pipeline interface of a steam inlet main pipe 79 of a 'water-fused salt-steam inverse conversion heating device' through a steam turbine low-pressure bypass valve inlet isolating door 72, a steam turbine reheating section steam supply pipeline tee joint 93 and a bypass steam turbine reheating section steam supply pipeline 82, the bypass steam turbine reheating section steam supply pipeline 82 is provided with a steam turbine reheating section bypass steam supply pipeline check door 92 and a steam turbine reheating section bypass steam supply pipeline isolating door 73, the other side of the existing steam turbine reheating section steam pipeline 98 through the arranged steam turbine reheating section steam supply pipeline tee joint 93 is connected with an existing steam turbine low-pressure bypass valve 85, the outlet side of the turbine low pressure bypass valve 85 is provided with a turbine low pressure bypass valve outlet isolation door 75 and a connecting pipeline 100, and the other end of the existing turbine reheating hot section steam pipeline 98 is connected with a turbine intermediate pressure cylinder steam inlet adjusting door 57-2.
The bypass turbine reheating thermal section steam extraction system is arranged to be noticed, the bypass turbine reheating steam supply flow selection needs a manufacturer to check and calculate a turbine body, and the existing turbine intermediate pressure cylinder steam inlet adjusting door 57-2 and the existing turbine intermediate pressure cylinder 53-2 body are modified as required.
In the above embodiments, preferably, the steam desuperheating for plant/industrial steam system: the system comprises a steam temperature-reducing plant/industrial steam pipeline 83 connected with a steam temperature reducer arranged in a 'water-molten salt-steam inverse transformation heat device' 47, wherein the steam temperature-reducing plant/industrial steam pipeline 83 is connected to the existing plant/industrial steam pipeline through a molten salt heat-releasing and steam temperature-reducing plant/industrial steam pipeline tee joint 94, and a 'water-molten salt-steam inverse transformation heat device' plant/industrial steam check valve 78 is arranged on the plant/industrial steam pipeline.
In the above embodiment, preferably, the "water-molten salt-steam reverse heat transfer device" hydrophobic system: the method comprises the steps of leading out a drain outlet pipeline interface of a 'water-molten salt-steam inverse transformation heat device', arranging a drain pipeline 69 of the 'water-molten salt-steam inverse transformation heat device' to lead drain into a boiler feed water deaerator 86 of a unit, and arranging a drain isolation door 63 and a drain adjusting door 64 on the drain pipeline 69 of the 'water-molten salt-steam inverse transformation heat device'.
In the above embodiment, preferably, the "water-molten salt-steam reverse heat exchanger" high-pressure water supply system: the system comprises a water supply deaerator 86 interface pipeline of an existing boiler, a deaerating water supply pipeline 65 of a boiler water supply pump, a boiler water supply pump 87, an outlet isolation door 61 of a high-pressure water supply pump of the boiler, a water supply system 58 of a steam turbine high-pressure heater, a boiler high-pressure water supply pipeline tee 95 of a 'water-molten salt-steam inverse transformation heat exchanger', a 'water-molten salt-steam inverse transformation heat exchanger' high-pressure water supply inlet isolation door 62, a 'water-molten salt-steam inverse transformation heat exchanger' high-pressure water supply pipeline 67 and a 'water-molten salt-steam inverse transformation heat exchanger' high-pressure water supply pipeline interface connected with the pipeline; the other end of the boiler high-pressure water supply pipeline tee 95 of the 'water-molten salt-steam inverse heat transfer device' is connected with the boiler 52 of the existing equipment of the unit.
In the above embodiment, preferably, the molten salt releases heat to the main steam system: the system comprises a water-molten salt-steam inverse transformation heat device auxiliary main steam supply pipeline 80, an auxiliary main steam isolation door 88 for the auxiliary main steam supply pipeline, a steam turbine auxiliary main steam high-pressure bypass pipeline steam inlet isolation door 71, wherein the auxiliary main steam supply pipeline is led out from a steam outlet pipeline interface of the water-molten salt-steam inverse transformation heat device, and the other end of the steam turbine auxiliary main steam high-pressure bypass pipeline steam inlet isolation door 71 is connected with a steam turbine high-pressure bypass auxiliary main steam inlet pipeline tee joint 90; the three-way pipe 90 of the auxiliary main steam inlet pipeline of the high-pressure bypass of the steam turbine enters the steam inlet adjusting door 57-1 of the high-pressure cylinder of the steam turbine through the existing steam pipeline 99 of the high-pressure bypass of the steam turbine, the steam inlet isolating door 70 of the high-pressure bypass valve of the steam turbine and the main steam pipeline 96 of the steam turbine. The existing turbine high-pressure bypass valve 54, the turbine high-pressure bypass valve outlet isolation door 55 and the connecting pipeline are connected to the turbine high-pressure bypass steam pipeline 99 at the other end of the bypass turbine main steam extraction pipeline tee 91, and the other end of the turbine main steam pipeline 96 is connected with the boiler 52.
In the above embodiment, preferably, the "water-molten salt-steam reverse heat exchanger" low-pressure water supply system: the system comprises a low-pressure water feeding pump deoxygenation water feeding pipeline 66, a low-pressure water feeding pump 59, a low-pressure water feeding pipeline 68 of a 'water-molten salt-steam inverse transformation heat device' and a 'water-molten salt-steam inverse transformation heat device' low-pressure water feeding isolation door 60 connected with a 'water-molten salt-steam inverse transformation heat device' low-pressure water feeding pipeline interface, wherein the low-pressure water feeding pipeline 66, the low-pressure water feeding pump, the 'water-molten salt-steam inverse transformation heat device' and the 'water-molten salt-steam inverse transformation heat device' are led out from an existing boiler water feeding deoxygenator 86 of a unit.
In the above embodiments, preferably, the molten salt releases heat for the plant/industrial steam system: the system is led out by a 'water-molten salt-steam inverse transformation heat device', and is connected to the existing plant/industrial steam pipeline of the unit through a set molten salt heat release plant/industrial steam pipeline 84, a 'water-molten salt-steam inverse transformation heat device' plant/industrial steam isolating door 76 and a plant/industrial steam pipeline check valve 78.
In the above embodiment, preferably, the thermal power flexibility "active balance" process monitoring control system includes a power grid dispatching center remote terminal control system RTU1, a power plant PMU 5, a thermal power generating unit DCS 6, a thermal power flexibility "active balance" process control system 17, a flywheel energy storage frequency modulation energy management system EMU18, and a molten salt energy storage frequency modulation control system DCS 19.
The thermal power flexibility active balance process control system DCS17 is respectively connected with the power grid dispatching center remote terminal control system RTU1, the unit DCS 6, the flywheel energy storage frequency modulation energy management system EMU18 and the fused salt energy storage frequency modulation control system DCS 19; and the power plant PMU 5 is connected with a remote terminal control system RTU1 of a power grid dispatching center, a unit DCS 6 and a flywheel energy storage frequency modulation energy management system EMU 18.
Specifically, a flexible thermal power active balance process control system DCS17 receives a power grid dispatching center RTU1AGC dispatching power instruction and generating power information of a unit DCS 6, sends control information to a flywheel energy storage frequency modulation energy management system EMU18 and a molten salt energy storage frequency modulation control system DCS 19 after processing, the flywheel energy storage frequency modulation energy management system EMU18 controls the running power of electricity generated by the flywheel energy storage frequency modulation system, the molten salt energy storage frequency modulation control system DCS 19 controls the electric power used by a controllable load molten salt electric heating device and the steam supply amount of a water-molten salt-steam inversion heat exchange system balance unit and the heat storage or heat release of the molten salt energy storage device, and the active balance service of the thermal power unit or the power system is achieved.
The following introduces each functional module of the thermal power flexibility multi-source coordination 'active balance' process system provided by this embodiment:
the cold salt supply function of the molten salt electric heating device is realized by a cold salt tank salt supply pipeline 42 arranged between an inlet pipeline of a cold salt pump and a three-way 41 connector of a cold salt pump salt supply door outlet pipeline and a cold salt tank cold salt supply pipeline 38 arranged between the three-way 41 connector of the cold salt pump salt supply door outlet pipeline and a cold salt inlet pipeline connector of the molten salt electric heating device, wherein a cold salt pump 33 and a cold salt pump salt supply door 34 are arranged on a cold salt tank 31, and a cold salt isolation door 35 of the molten salt electric heating device is arranged on the cold salt supply pipeline 38 of the molten salt electric heating device;
the hot salt supply function of the molten salt electric heating device is realized by a molten salt electric heating device hot salt supply pipeline 49 arranged at the interface from a water-molten salt-steam inverse transformation heat device hot salt outlet pipeline to a molten salt electric heating device hot salt inlet pipeline, a molten salt-steam inverse transformation heat device hot salt outlet isolating door 48 arranged in the pipeline and a molten salt electric heating device hot salt supply isolating door 51;
the hot salt returning function of the molten salt electric heating device is realized by a hot salt returning pipeline 46 of the molten salt electric heating device arranged between a hot salt outlet pipeline interface of the molten salt electric heating device and a hot salt inlet pipeline interface of a hot salt tank and a hot salt tank returning door 45 arranged on the hot salt returning pipeline 46;
the cold salt supply function of the 'water-molten salt-steam inverse transformation heat device' is realized by a cold salt tank salt supply pipeline 42 arranged between the three-way joint of the cold salt pump inlet pipeline and the cold salt pump salt supply door outlet pipeline 41 and a 'water-molten salt-steam inverse transformation heat device' cold salt supply pipeline 39 arranged between the three-way joint of the cold salt pump salt supply door outlet pipeline and the cold salt inlet pipeline joint of the 'water-molten salt-steam inverse transformation heat device', wherein a 'water-molten salt-steam inverse transformation heat device' cold salt supply isolating door 36 is arranged on the 'water-molten salt-steam inverse transformation heat device' cold salt supply pipeline 39;
the hot salt returning function of the water-molten salt-steam inverse transformation heat exchange device is determined according to the molten salt performance and the steam supply parameter of the water-molten salt-steam inverse transformation heat exchange system, the hot salt returning function selected according to high parameters is the hot salt supplying function of the molten salt electric heating device, and the hot salt outlet of the water-molten salt-steam inverse transformation heat exchange device can be connected to the inlet of the hot salt tank according to the molten salt performance and the steam supply parameter of the water-molten salt-steam inverse transformation heat exchange system;
the salt return function of the cold salt tank is realized by a cold salt return pipeline 40 of a water-molten salt-steam inverse transformation heat device arranged between a cold salt outlet pipeline interface of the water-molten salt-steam inverse transformation heat device and a cold salt return isolating door 37 of the water-molten salt-steam inverse transformation heat device on the cold salt return pipeline 40;
the salt feeding function of the hot salt tank is realized by arranging a hot salt feeding pipeline 50 of a water-molten salt-steam inverse transformation heat device and a hot salt outlet isolating door 48 of the water-molten salt-steam inverse transformation heat device between a hot salt tank 31 and a hot salt inlet pipeline interface from a hot salt pump inlet to the water-molten salt-steam inverse transformation heat device, wherein a hot salt pump 43 and a hot salt pump salt feeding door 44 are arranged on the hot salt tank 32;
the electric heating device has the functions of cold salt heat absorption and energy storage, and is realized by mutually matching a cold salt tank 31, a cold salt tank salt supply pipeline 42, a cold salt pump 33, a cold salt supply door 34, a cold salt pump salt supply door outlet pipeline tee 41, a cold salt-molten salt-steam inverse transformation heat device cold salt supply isolating door 36, a molten salt electric heating device cold salt supply pipeline 38, a molten salt electric heating device cold salt supply isolating door 35, a molten salt electric heater 27, a molten salt electric heating device hot salt return pipeline 46, a hot salt tank salt return door 45 and a hot salt tank 32;
the steam heating cold salt, the electric heating hot salt heat absorption and the energy storage device heat storage function are realized by a cold salt tank 31, a cold salt tank salt supply pipeline 42, a cold salt pump 33, a cold salt supply door 34 and a cold salt pump salt supply door outlet pipeline tee joint 41, the system comprises a water-molten salt-steam inverse transformation heat device cold salt supply pipeline 39, a water-molten salt-steam inverse transformation heat device cold salt supply isolating door 36, a water-molten salt-steam inverse transformation heat device 47, a water-molten salt-steam inverse transformation heat device heat salt outlet isolating door 48, a molten salt electric heating device heat salt supply pipeline 49, a molten salt electric heating device heat salt supply isolating door 51, a molten salt electric heater 27, a molten salt electric heating device heat salt return pipeline 46, a heat salt tank return door 45, a heat salt tank 32, a corresponding molten salt electric heating device cold salt supply isolating door 35 and a corresponding molten salt pump outlet supply door 44 which are matched with one another;
the molten salt heat release and energy storage device has the heat release function and is realized by the mutual matching of a hot salt tank 32, a hot salt pump 43, a hot salt pump salt supply door 44, a water-molten salt-steam inverse transformation heat device hot salt supply pipeline 50, a water-molten salt-steam inverse transformation heat device 47, a cold salt return pipeline 40, a water-molten salt-steam inverse transformation heat device cold salt return isolating door 37, a cold salt tank 31, a corresponding water-molten salt-steam inverse transformation heat device water and steam side systems and a cold salt supply isolating door 36;
the energy storage device releases heat, the 'water-molten salt-steam inverse transformation heat device' molten salt heat release, and the boiler deoxidized water supply plant/industrial steam function are connected with the unit plant/industrial steam supply pipeline through a boiler water supply deaerator 86, a low-pressure water supply pump deoxidized water supply pipeline 66, a low-pressure water supply pump 59, a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply pipeline 68, a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply isolation door 60, a 'water-molten salt-steam inverse transformation heat device' 47 and plant/industrial steam pipeline isolation door 76 thereof, a molten salt heat release plant/industrial steam pipeline 84, a 'water-molten salt-steam inverse transformation heat device' plant/industrial steam check door 78. Correspondingly closing a steam and water side pipeline valve steam temperature-reducing plant/industrial steam isolating door 77, an auxiliary main steam isolating door 88, a steam inlet main pipe isolating door 89, a high-pressure water supply inlet isolating door 62 and a drainage isolating door 63 which are connected with a water-molten salt-steam inverse transformation heat device, and realizing heat release matching of an energy storage device;
the energy storage device releases heat, the 'water-molten salt-steam inverse transformation heat device' molten salt heat release and steam turbine high-pressure heater water supply system 58 supplies water and main steam to the main steam function, the boiler water supply deaerator 86 deaerates the water supply pipeline 65 through the boiler water supply pump, the boiler water supply pump 87, the steam turbine high-pressure heater water supply system 58, the 'water-molten salt-steam inverse transformation heat device' high-pressure water supply pipeline 67 and the 'water-molten salt-steam inverse transformation heat device' high-pressure water supply inlet isolating door 62, the 'water-molten salt-steam inverse transformation heat device' 47, the 'water-molten salt-steam inverse transformation heat device' auxiliary main steam supply pipeline 80 and the auxiliary main steam isolating door 88 thereon, the steam turbine auxiliary main steam high-pressure bypass pipeline steam inlet isolating door 71, the steam turbine high-pressure bypass pipeline 99 and the steam turbine high-pressure bypass valve steam inlet isolating door 70 thereon, The main steam pipeline 96 of the steam turbine and the steam inlet adjusting door 57-1 of the high-pressure cylinder of the steam turbine enter the high-pressure cylinder 53-1 of the steam turbine, and the energy storage devices of the outlet isolation door 55 of the high-pressure bypass valve of the steam turbine and the steam inlet isolation door 70 of the high-pressure bypass valve of the steam turbine are correspondingly closed to realize heat release in a matching way;
the main steam of the bypass turbine is used for temperature reduction supply/industrial steam, the molten salt heat absorption and energy storage device of the water-molten salt-steam inverse transformation heat device respectively enters a turbine main steam pipeline 96 and a turbine high-pressure bypass steam pipeline 99 from a boiler 52 and a turbine main steam pipeline tee 97, one pipeline passes through a turbine high-pressure bypass valve steam inlet isolation door 70, a water-molten salt-steam inverse transformation heat device bypass turbine main steam extraction pipeline 81, a high-pressure bypass steam supply isolation door 56 and a bypass turbine main steam extraction pressure regulating valve 74 on the same, a water-molten salt-steam inverse transformation heat device steam temperature reduction, steam temperature reduction supply/industrial steam pipeline 83, a steam temperature reduction supply/industrial steam isolation door 77, a molten salt heat release supply/industrial steam pipeline 84, a steam temperature reduction supply/industrial steam pipeline 84 on the same, The factory-supply/industrial steam check valve 78 of the 'water-molten salt-steam inverse heat conversion device' is connected to a factory-supply/industrial steam supply pipeline of a unit, and one path of steam enters the high-pressure cylinder 53-1 of the steam turbine through the steam inlet adjusting valve 57-1 of the high-pressure cylinder. Correspondingly adjusting a steam inlet adjusting door 57-1 of a high-pressure steam cylinder of the steam turbine, closing a steam inlet isolating door 71 of an auxiliary main steam high-pressure bypass pipeline of the steam turbine, an outlet isolating door 55 of a high-pressure bypass valve of the steam turbine, a steam supply pipeline isolating door 73 of a reheating thermal section bypass of the steam turbine, an auxiliary main steam isolating door 88 of a water-molten salt-steam inverse transformation heat device, a plant/industrial steam pipeline isolating door 76 of a plant/industrial steam pipeline isolating door 79 of the water-molten salt-steam inverse transformation heat device, a plant/industrial steam pipeline isolating door 76 of the water-molten salt-steam inverse transformation heat device on the steam inlet main pipe 79, a low-pressure water supply isolating door 60, a high-pressure water supply inlet isolating door 62 and a water drainage isolating door 63, and realizing the heat storage matching of the energy storage device;
the bypass steam reheating steam temperature-reducing supply/industrial steam for plant, the molten salt heat absorption and energy storage device heat storage functions of the water-molten salt-steam inverse transformation heat device are realized by a boiler 52 through a steam pipeline 98 of a reheating hot section of a steam turbine and an inlet isolation door 72 of a low-pressure bypass valve on the steam pipeline, a steam supply pipeline 82 of the reheating hot section of the bypass steam turbine and a steam supply pipeline isolation door 73 of the reheating hot section of the steam turbine, a check valve 92 of a bypass steam supply pipeline of the reheating hot section of the steam turbine, a steam inlet main pipe 79 and a steam inlet main pipe isolation door 89 of the water-molten salt-steam inverse transformation heat device, a steam temperature-reducing device, a steam temperature-reducing supply/industrial steam pipeline 83 and a steam temperature-reducing supply/industrial steam isolation door 77 on the steam pipeline 83, a molten salt heat-releasing supply/industrial steam pipeline 84, The 'water-molten salt-steam inverse transformation heat device' for plant/industrial steam check valve 78 is connected to a plant/industrial steam supply pipeline, the steam inlet adjusting valve 57-2 of the steam turbine intermediate pressure cylinder is correspondingly adjusted, and the steam and water side pipeline valves connected with the 'water-molten salt-steam inverse transformation heat device' are closed, and are provided with a steam turbine low-pressure bypass valve outlet isolating door 75, a high-pressure bypass steam supply isolating door 56, a 'water-molten salt-steam inverse transformation heat device' for auxiliary main steam isolating door 88, a plant/industrial steam pipeline isolating door 76, a high-pressure water supply inlet isolating door 62 and a drainage isolating door 63, and the energy storage device is realized by heat storage and matching;
the bypass turbine main steam 'water-molten salt-steam inverse transformation heat device' has heat exchange and energy storage functions, and the boiler 52 passes through a turbine main steam pipeline 96, a turbine high-pressure bypass steam pipeline 99 and a turbine high-pressure bypass valve steam inlet isolation door 70 on the turbine high-pressure bypass steam pipeline 99, a 'water-molten salt-steam inverse transformation heat device' bypass turbine main steam extraction pipeline 81 and a high-pressure bypass steam supply isolation door 56 and a bypass turbine main steam extraction pressure regulating valve 74 on the bypass turbine main steam extraction pipeline, a 'water-molten salt-steam inverse transformation heat device' 47, a 'water-molten salt-steam inverse transformation heat device' drain pipeline 69 and a drain isolation door 63 on the drain pipeline, a drain regulation door 64 and a boiler water feeding deaerator 86. Correspondingly adjusting a steam inlet adjusting door 57-1 of a high-pressure steam cylinder of the steam turbine, closing an auxiliary main steam high-pressure bypass pipeline steam inlet isolating door 71 of the steam turbine, a steam turbine high-pressure bypass valve outlet isolating door 55, a steam turbine reheating thermal section bypass steam supply pipeline isolating door 73, a 'water-molten salt-steam inverse transformation heat device' steam temperature reduction supply plant/industrial steam isolating door 77, an auxiliary main steam supply isolating door 88, a plant/industrial steam pipeline isolating door 76, a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply isolating door 60 and a high-pressure water supply inlet isolating door 62, and realizing heat storage matching of an energy storage device;
the bypass turbine reheating section steam 'water-molten salt-steam inverse transformation heat device' has the heat exchange and energy storage device heat storage functions, and the boiler 52 passes through a turbine reheating section steam pipeline 98 and a turbine low-pressure bypass valve inlet isolation door 72 arranged on the turbine reheating section steam pipeline, a bypass turbine reheating section steam supply pipeline 82 and a turbine reheating section bypass steam supply pipeline isolation door 73 arranged on the bypass turbine reheating section steam supply pipeline 82, a turbine reheating section bypass steam supply pipeline check valve 92, a 'water-molten salt-steam inverse transformation heat device' steam inlet main pipe 79 and a steam inlet main pipe isolation door 89, a 'water-molten salt-steam inverse transformation heat device' 47, a 'water-molten salt-steam inverse transformation heat device' drain pipeline 69 and a drain isolation door 63 arranged on the water-drain pipeline 69, a drain adjusting door 64 and a boiler water supply deaerator 86. Correspondingly, the steam inlet adjusting valve 57-2 of the steam turbine intermediate pressure cylinder, the steam and water side pipeline valves for closing the steam and water side pipeline valves connected with the water-molten salt-steam inverse transformation heat device are provided with a steam turbine low-pressure bypass valve outlet isolating door 75, a high-pressure bypass steam supply isolating door 56, a water-molten salt-steam inverse transformation heat device auxiliary main steam supply isolating door 88, a plant/industrial steam pipeline isolating door 76, a water-molten salt-steam inverse transformation heat device low-pressure water supply isolating door 60 and a high-pressure water supply inlet isolating door 62, the heat storage of the energy storage device is realized in a matched mode, and the heat storage of the energy storage device is realized in a matched mode.
Example 2
Based on the thermal power flexibility multi-source coordination 'active balance' process system provided by embodiment 1, the embodiment takes the flywheel energy storage frequency modulation system providing the rotational inertia and/or primary frequency modulation active balance service as an example, and introduces an application method of the thermal power flexibility multi-source coordination 'active balance' process system.
The primary frequency modulation active balance service is provided by adjusting active output to reduce frequency deviation through rapid frequency response by a flywheel energy storage frequency modulation system when the frequency of a power grid system where a unit is located deviates from a target frequency. The method mainly comprises the following two types:
the first type is based on power information sent by a power plant PMU, and a flywheel energy storage frequency modulation system replaces a primary frequency modulation function of a conventional thermal power generating unit.
1) The flywheel energy storage frequency modulation energy management system EMU18 receives power information of a PMU 05 of a power plant or a separately-arranged high-precision power grid power meter and receives flywheel energy storage device array energy information of a flywheel energy storage device array inverter PCS 23;
2) the flywheel energy storage frequency modulation energy management system EMU18 calculates the frequency disturbance quantity according to the received power information measured by the power plant PMU 5 or a high-precision power grid frequency meter which is independently arranged, compares the deviation with the target frequency, and schedules and controls the charging and discharging power of the flywheel energy storage device array inverter PCS 23;
3) after receiving a charging and discharging power instruction of a flywheel energy storage frequency modulation energy management system EMU18, the flywheel energy storage device array inverter PCS 23 schedules and controls the charging and discharging power of a flywheel energy storage array management system FMS 24;
4) after receiving the charging and discharging power control instruction of the flywheel energy storage array inverter PCS 23, the flywheel energy storage array management system FMS 24 schedules and controls the charging and discharging operation of the flywheel energy storage device 26.
And in the second category, based on a scheduling power instruction sent by a power grid scheduling center (RTU), the flywheel energy storage frequency modulation system independently provides auxiliary services of rotational inertia and primary frequency modulation active balance for a power grid.
Comprises the following steps
1) The method comprises the following steps that a power grid dispatching center RTU1 sends a dispatching power instruction to a flywheel energy storage frequency modulation energy management system EMU18 through a thermal power flexibility active power balance process control system DCS17 or directly;
2) after receiving an AGC (automatic gain control) scheduling power instruction of a thermal power flexibility active balance process control system DCS17 or a power grid scheduling center RTU1, a flywheel energy storage frequency modulation energy management system EMU18 schedules and controls the charging and discharging power of a flywheel energy storage device array inverter PCS 23;
3) after receiving a charging and discharging power instruction of a flywheel energy storage frequency modulation energy management system EMU18, the flywheel energy storage device array inverter PCS 23 schedules and controls the charging and discharging power of a flywheel array management system FMS 24;
4) after receiving the charging and discharging power control instruction of the flywheel energy storage array inverter PCS 23, the flywheel array management system FMS 24 schedules and controls the charging and discharging operation of the flywheel energy storage device 26.
As shown in fig. 4, a comparison graph of the primary frequency modulation effect of the thermal power generating unit replaced by the flywheel energy storage frequency modulation system is shown. As can be seen, the time of the whole process of the flywheel energy storage frequency modulation system responding to 0-100% target power is less than 200 milliseconds. The charging and discharging power and the stored electric quantity of the flywheel energy storage frequency modulation system can reduce the power grid frequency change amplitude at the initial stage (within 2-10 s) of the power system fault, and improve the frequency at the lowest point or reduce the frequency at the highest point at the initial stage of the power grid fault. Compared with a conventional thermal power generating unit, the flywheel energy storage frequency modulation system has the characteristics of constant-power quick response, short-time support and no-rotation inertial potential energy recovery, so that the flywheel energy storage frequency modulation system can be coordinated with the time delay and the persistence of other conventional frequency modulation power supplies to give full play to respective advantages, and therefore the power grid frequency under the transient fault of a power system is better supported.
The requirements of 5.3.1 in the Primary frequency modulation test and Performance acceptance guide rule of thermal generator sets (GB/T30370-2013) are as follows:
a) the response lag time of the unit participating in primary frequency modulation is less than 3 s.
b) The time for the coal burning unit to reach 75% of the target load should be no more than 15 seconds.
c) The time for the coal burning unit to reach 90% of the target load should be no greater than 30 seconds.
d) The stabilization time of the unit participating in the primary frequency modulation is less than 1 min.
Taking a 350MW thermal power generating unit as an example, the requirement of the guide rule is difficult to achieve under 50% load, and the primary frequency modulation dynamic performance in the 50% -85% rated load range is as follows:
a) the response lag time of the unit participating in primary frequency modulation is usually more than 2s,
b) the average regulating time of active power is usually more than 30 s;
c) the time for the coal burning unit to reach 75% of the target load is generally greater than 15 s;
d) the time for the coal-fired unit to reach 90% of the target load is not more than 30 s;
e) the stabilization time of the unit participating in primary frequency modulation is more than 1 min.
The rotational speed rate of inequality is calculated as 5%, and the theoretical power/frequency adjustment amount is about 1.165MW/r/min, namely 2.33.MW/0.0165Hz and 14MW/0.1 Hz.
Thirdly, configuring examples of main technical parameters of the flywheel energy storage frequency modulation system:
according to the primary frequency modulation amplitude limiting standard in 5.3 GB/T40595-2021 grid-connected power primary frequency modulation technical regulation and test guide rules, taking a 350MW thermal power generating unit as an example, the variation amplitude of primary frequency modulation power is not less than +/-8% of rated active power, and configuring technical parameters of a flywheel energy storage frequency modulation system:
rating: the charge and discharge power is 28 MW; the charge-discharge multiplying power is 2C; the energy storage time is 6 min; the time delay of primary frequency modulation is less than 200 milliseconds;
remarking: c represents the charge/discharge rate of the energy storage system, i.e., the ratio of the current magnitudes when the energy storage system is charged/discharged, and is generally represented by the letter C. For example, under a rated energy storage capacity, the energy storage system is discharged for 1 hour, which is called 1C discharge, and discharged for 0.5 hour, which is called 2C discharge.
According to the reports of relevant documents, the method for restraining the out-of-limit of the grid frequency comprises the following steps: the frequency drops to 49.9HZ 0t to act, and the required energy storage duration is 4 minutes; and (3) suppressing low-frequency load shedding: the frequency is dropped to 49.75HZ 0t action, and the required energy storage duration is 6 minutes. The specific application is determined according to frequency characteristic tests or simulation calculation of a power grid system where the unit is located.
When the operation of the thermal power generating unit adopts an AGC control mode, for second-level AGC dispatching instructions with short duration and frequent retracing, the primary frequency modulation adjustment quality of the thermal power generating unit is influenced due to the characteristic of inertial response delay of the thermal power generating unit, and even secondary frequency modulation and primary frequency modulation are opposite frequently. The flywheel energy storage frequency modulation system is used for replacing the primary frequency modulation of the unit, a primary frequency modulation input button and a primary frequency modulation output button can be arranged in a unit control system such as a thermal power generating unit DCS 6, and when the flywheel energy storage frequency modulation system is put into operation, the primary frequency modulation function in the unit control system is set to be in an output state, so that mutual interference between AGC frequency modulation adjustment and the primary frequency modulation adjustment of the unit can be effectively avoided. The flywheel energy storage frequency modulation system is arranged, and the design of the original primary frequency modulation scheme of the DEH control system and the CCS coordination control system of the unit is not changed.
Example 3
Based on the thermal power flexibility multi-source coordination 'active balance' process system provided by embodiment 1, the embodiment takes the flywheel energy storage frequency modulation system, the flywheel energy storage frequency modulation system and/or the molten salt energy storage frequency modulation system as an example to be fused with a thermal power generating unit to provide the secondary frequency modulation active balance service of the power system, and introduces an application method of the thermal power flexibility multi-source coordination 'active balance' process system.
The secondary frequency modulation of the process system of multi-source coordination active power balance by applying thermal power flexibility is realized by an automatic power control technology comprising Automatic Generation Control (AGC) and Automatic Power Control (APC), an instruction given by an electric power dispatching mechanism is tracked, and the electric power for generation is adjusted in real time according to the adjusting rate specified by the national power grid standard so as to meet the service requirements of the Automatic Generation Control (AGC) and the Automatic Power Control (APC) of the electric power system.
This embodiment can be divided into two cases:
the first type: and providing a secondary frequency modulation active power balance service of the power system based on AGC (automatic gain control) regulation target power instruction information of a power grid dispatching center RTU and generating power state information sent by a DCS (distributed control system) of the thermal power generating unit.
The method mainly comprises the following steps:
1) the method comprises the steps that a thermal power flexibility active balance process control system DCS17 receives AGC power target instruction information sent by a power grid dispatching center RTU1 and thermal power unit generating power state information sent by a thermal power unit DCS 6;
2) the thermal power flexibility active balance process control system DCS17 compares and analyzes the completion quality of the power generation power of the thermal power unit DCS 6 to a power grid dispatching center RTU1AGC dispatching power instruction according to the stored energy and the running state of the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system and the AGC frequency modulation dynamic performance state of the thermal power unit DCS 6, and adaptively schedules and controls the thermal power flexibility multi-source coordination power generation and power utilization operation of the thermal power flexibility active balance process system.
The second type: and adjusting a target power instruction by AGC based on a RTU of a power grid dispatching center, and providing a secondary frequency modulation active balance service of the power system by fusing a flywheel energy storage frequency modulation system, a flywheel energy storage frequency modulation system and/or a molten salt energy storage frequency modulation system with a thermal power generating unit.
Taking the statistical coverage rate data of AGC (automatic gain control) scheduling power/duration frequency modulation instructions of a certain 330MW thermal power generating unit as an example:
AGC single frequency modulation instruction: the ratio of the target power less than or equal to 18MW (5.5 percent of rated power) is more than 97 percent, and the ratio of the time length less than or equal to 6min is more than or equal to 91 percent; and (3) continuously adjusting the instruction for more than two times in the AGC single direction: the ratio of the target power less than or equal to 18MW (5.5 percent of rated power) is more than 22 percent, the ratio of the target power less than or equal to 42MW (12.7 percent of rated power) is more than 98 percent, the ratio of the target power less than or equal to 5min is less than or equal to 37 percent, and the ratio of the target power more than or equal to 13 min is less than 3 percent.
Therefore, the present embodiment is divided into two cases according to the power grid dispatching center RTU1AGC adjustment target power value:
in the first case: power grid dispatching center RTU1AGC adjusting target power < (8% unit rated power + unit basic adjusting speed x unit rated power)
At the moment, the application of a thermal power flexibility multi-source coordination 'active power balance' process system combining a flywheel energy storage frequency modulation system with AGC frequency modulation of a thermal power unit comprises the following steps:
1) determining the adjusting rate in the full-load adjusting range of the thermal power generating unit;
2) determining the percentage of the remaining electric quantity of the flywheel energy storage frequency modulation system SOC (state of charge);
3) the thermal power generating unit responds to a power grid dispatching center RTU1AGC to adjust target power according to self capacity;
4) the flywheel energy storage frequency modulation energy management system EMU18 sequentially schedules and controls a flywheel energy storage device array inverter PCS 23, a flywheel energy storage device array management system FMS 24, a flywheel energy storage device converter FCS 25 and a flywheel energy storage device 26 to regulate the running of electric power for generation according to the difference between a target power instruction regulated by a power grid scheduling center RTU1AGC and the real-time generating power of a thermal power generating unit DCS 6 read by a thermal power flexibility active balance process control system DCS 17;
5) firstly, the voltage of a flywheel energy storage device array bus 22 is regulated to run at a constant voltage within a rated parameter range, the charging and discharging multiplying power of a flywheel energy storage device 26 is regulated to be less than or equal to 2C, and when the output power of a thermal power generating unit meets the precision requirement of regulating target power of an RTU1AGC of a power grid dispatching center, a flywheel energy storage frequency modulation system stops outputting power and normally keeps 50 +/-5% SOC for running and standby.
In the second case: the power grid dispatching center RTU1AGC adjusts the target power > (8% set rated power + set basic adjusting speed x set rated power).
Combining a flywheel energy storage frequency modulation system with a fused salt energy storage frequency modulation system to fuse two typical forms of thermal power flexibility multi-source coordination 'active balance' process system application methods of thermal power unit AGC frequency modulation;
in a first form: the molten salt energy storage frequency modulation system is in hot standby, and the molten salt electric heating device is in an operating state:
1) the flywheel energy storage frequency modulation system is combined with the power regulation capability of a thermal power generating unit under the condition that the difference between the accumulated on-line power and the regulation target power of a power grid dispatching center RTU1AGC is less than or equal to the power regulation capability of a molten salt electric heating device in the running state, and the main application method comprises the following steps:
firstly, determining that the flywheel energy storage frequency modulation system and the thermal power generating unit are combined to adjust accumulated on-line power and operate in a saturated state;
secondly, the fused salt electric heating device is used as a controllable load, and the fused salt electric heating device is adjusted to be combined with flywheel energy storage frequency modulation system adjustment and thermal power generating unit adjustment to accumulate output power to reach the target power of power grid dispatching center RTU1AGC adjustment;
thirdly, responding to the power regulation sequence of the RTU1AGC of the power grid dispatching center, sequentially controlling the generator power of the DCS 6 of the thermal power generating unit, regulating the generating electric power of the flywheel energy storage frequency modulation system by the flywheel energy storage frequency modulation energy management system EMU18, and regulating the electric load of the fused salt electric heating device by the fused salt energy storage frequency modulation control system DCS 19.
2) The difference between the adjustment accumulated grid power of the flywheel energy storage combined thermal power generating unit and the adjustment target power of the power grid dispatching center RTU1AGC is larger than the adjustment capacity of the molten salt electric heating device in the running state, and the method mainly comprises the following steps:
firstly, a flywheel energy storage and fused salt electric heating device is combined with a thermal power generating unit to adjust accumulated grid power and operate in a saturated state;
secondly, the water-molten salt-steam inversion heat exchange system is used as a controllable load, and a water-molten salt-steam inverse transformation heat exchange device 47 is adjusted to integrate the accumulated output power of the flywheel energy storage frequency modulation system and the molten salt electric heating device of the thermal power generating unit to reach the RTU1AGC adjustment target power of a power grid dispatching center;
and responding to the power regulation sequence of the power grid dispatching center RTU1AGC, the thermal power generating unit DCS 6 regulates the power of the generator, the flywheel energy storage frequency modulation energy management system EMU18 regulates the power generation/utilization power of the flywheel energy storage device 26, and the molten salt energy storage frequency modulation control system DCS 19 controls the steam extraction/steam supply flow of the steam turbine in the water-molten salt-steam inversion heat exchange system and regulates the power utilization load of the molten salt electric heating device.
In a second form: hot standby of fused salt energy storage frequency modulation system and non-operation of fused salt electric heating device
When the peak-valley difference of the power grid is large and the variation amplitude of the new energy generated power is large, the RTU1AGC adjusting instruction of the power grid dispatching center is continuously added or subtracted in a single direction, the flywheel energy storage capacity is insufficient in the application method, the unit adjusting speed is maximum, and the accumulated on-grid power and the RTU1AGC adjusting target power of the power grid dispatching center are not balanced:
1) increasing power
Firstly, a water-molten salt-steam inversion heat exchange system is used for a plant/industrial steam system to operate, so that steam extraction of a steam turbine is reduced, and the power generation power is increased;
and secondly, the water-molten salt-steam inversion heat exchange system is used for the main steam system to operate, and the steam inlet flow of the main steam of the steam turbine is increased to increase the power generation power.
2) Reducing power
Firstly, a water-molten salt-steam inversion heat exchange system bypasses main steam or reheat section steam to heat molten salt for heat storage, and drains water to a deaerator;
and secondly, the water-molten salt-steam inversion heat exchange system bypasses the main steam and reheating section steam to heat molten salt for heat storage at the same time, and water is drained to a deaerator.
The second form is not easy to be used for minute-level frequency modulation turn-back operation due to large operation workload of the steam and molten salt system, and is more suitable for the working condition that the daily two-peak two-valley or three-peak two-valley of a small-level power grid, the RTU1AGC adjusting instruction of a power grid dispatching center continuously and unidirectionally adds or subtracts and dispatches the target power with larger change amplitude, the initial operation steam extraction and steam supply turn-back time is preferably more than or equal to 1 hour, and the operation of steam system drainage and steam combination needs to be particularly and fully concerned.
The main configuration technical parameters of the molten salt energy storage frequency modulation system comprise:
power of the molten salt electric heater: the rated power of the unit is more than or equal to 20 percent;
adjusting time of 0-100% rated power of the molten salt electric heating energy storage system: less than 5 min;
energy storage by molten salt: the rated power MW of the unit is more than or equal to 20 percent and is multiplied by 7 hours;
molten salt heat release main steam flow: more than or equal to 15 percent of B-MCR t/h;
adjusting time of 0-100% rated output of molten salt heat release and main steam flow: is less than 5 min.
Example 4
Based on the thermal power flexibility multi-source coordination 'active balance' process system provided by embodiment 1, the embodiment provides a thermal power flexibility multi-source coordination 'active balance' process system which integrates a thermal power unit to form a 'virtual frequency modulation power supply' to provide rotary inertia, primary frequency modulation and secondary frequency modulation 'active balance service' for a power system and a new energy unit, and the application method comprises the following steps:
1) the thermal power flexibility active balance process control system DCS17 uploads the relevant information of the power grid active balance service technical performance such as available power, regulation performance, energy storage capacity and the like of a flywheel energy storage frequency modulation energy management system EMU18 and a fused salt energy storage frequency modulation control system DCS 19 to a power grid dispatching center RTU1 according to the power grid requirements;
2) the method comprises the following steps that a power grid dispatching center RTU1 sends (APC) automatic power control commands to a thermal power flexibility active power balance process control system DCS17 or sends primary frequency modulation control commands to a flywheel energy storage frequency modulation energy management system EMU18, and the flywheel energy storage frequency modulation energy management system EMU18 controls the flywheel energy storage frequency modulation system to perform charging and discharging operation, so that rotational inertia and primary frequency modulation services are provided for a power system;
3) the method comprises the following steps that a power grid dispatching center RTU1 issues (APC) an automatic power control instruction to a thermal power flexibility active power balance process control system DCS17, wherein:
power increase adjustment sequence: the flywheel energy storage frequency modulation system generates electricity and operates; the fused salt electric heating device is in load shedding operation; the molten salt energy storage device releases heat, and the 'water-molten salt-steam inversion heat exchange system' is used for plant/industrial steam or main steam to generate electricity;
② power reduction adjustment sequence: the flywheel energy storage frequency modulation system runs by using electricity; the 'water-molten salt-steam inversion heat exchange system' bypasses main steam or reheated steam according to power adjustment requirements, or bypasses the main steam and the reheated steam simultaneously, and the molten salt energy storage device stores heat; and (4) loading the molten salt electric heating device and storing heat of the molten salt energy storage device.
Specifically, the target power reduction direction adjustment method includes:
a. charging the flywheel energy storage frequency modulation system;
b. according to the peak regulation capacity, the fused salt energy storage frequency modulation control system controls a water-fused salt-steam inversion heat exchange system to sequentially select a bypass turbine main steam pressure reduction steam supply system to supply steam and a bypass turbine reheat steam supply system to supply steam; the main steam of the bypass steam turbine is supplied by a pressure reduction steam supply system; the bypass steam turbine supplies steam to the reheat steam supply system, drains water to the deaerator, stores heat in the molten salt energy storage device, and the molten salt electric heating device runs;
c. according to the peak regulation capacity requirement and the requirement of plant/industrial steam heat supply, a fused salt energy storage frequency modulation control system controls a water-fused salt-steam inversion heat exchange system to sequentially select a bypass turbine main steam pressure reduction steam supply system to supply steam and a bypass turbine reheating steam supply system to supply steam; the main steam of the bypass steam turbine is supplied by a pressure reduction steam supply system; the bypass steam turbine supplies steam to a reheat steam supply system, the 'water-molten salt-steam inverse transformation heat device' supplies plant/industrial steam by steam temperature reduction, the molten salt energy storage device stores heat, and the molten salt electric heating device operates;
d. the above b-c modes can also be flexibly combined to adjust the operation
e. The fused salt electric heating device and the fused salt energy storage device are operated by heat storage.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (11)

1. An application method of a thermal power flexibility multi-source coordination 'active power balance' process system is characterized by comprising the following steps:
setting a thermal power flexibility multi-source coordination 'active balance service' process system, wherein the system comprises a flywheel energy storage frequency modulation system, a molten salt energy storage frequency modulation system and a thermal power flexibility 'active balance' process control system;
controlling a flywheel energy storage frequency modulation system to provide rotational inertia or primary frequency modulation active power balance service for a thermal power plant;
a flywheel energy storage frequency modulation system and a fused salt energy storage frequency modulation system are adopted to fuse a thermal power generating unit so as to provide multi-source coordination active power balance service.
2. The method for applying the thermal power flexibility multi-source coordination 'active balance' process system as claimed in claim 1, wherein the molten salt energy storage frequency modulation system comprises a molten salt electric heating device, a molten salt energy storage device, a water-molten salt-steam inversion heat exchange system containing a 'water-molten salt-steam inverse transformation heat exchange device'; the power supply of the molten salt electric heating device is taken from a power plant on-off bus, and the molten salt electric heating device is connected with the molten salt energy storage device through a molten salt electric heating device cold salt supply pipeline and a molten salt electric heating device hot salt return pipeline; the salt side pipeline of the water-molten salt-steam inverse transformation heat device is connected with the molten salt energy storage device through a cold salt supply pipeline of the water-molten salt-steam inverse transformation heat device, is connected with the molten salt electric heating device through a hot salt supply pipeline of the molten salt electric heating device, and is connected with the molten salt energy storage device through a hot salt return pipeline of the molten salt electric heating device after being secondarily heated by the molten salt electric heating device;
the flywheel energy storage frequency modulation system comprises a plurality of flywheel energy storage frequency modulation units which are connected in parallel, each flywheel energy storage frequency modulation unit is provided with a flywheel energy storage frequency modulation unit transformer, each flywheel energy storage frequency modulation unit is connected in parallel and connected into a flywheel energy storage frequency modulation system bus, and the flywheel energy storage frequency modulation system bus isolating switch is connected into a station-used 6kV bus; each flywheel energy storage frequency modulation unit comprises one or more groups of flywheel energy storage device array inverters PCS, the flywheel energy storage device array inverters PCS are connected with the flywheel energy storage frequency modulation unit bus through a flywheel energy storage device array inverter alternating current isolating switch, and the flywheel energy storage frequency modulation unit bus is connected with a flywheel energy storage frequency modulation unit transformer through a flywheel energy storage frequency modulation unit isolating switch; each flywheel energy storage device array inverter is connected with one or a plurality of flywheel energy storage device modules through a flywheel energy storage device array bus; each flywheel energy storage device module consists of a flywheel energy storage array management system FMS and a plurality of flywheel energy storage device modules, each flywheel energy storage device module is connected to a flywheel energy storage device array bus through a flywheel energy storage device converter direct current switch, the flywheel energy storage device array inverter PCS controls one or a plurality of flywheel energy storage array management systems FMS, the flywheel energy storage array management system FMS controls one or a plurality of flywheel energy storage device converters FCS, and each flywheel energy storage device converter FCS controls one flywheel energy storage device;
the thermal power flexibility active balance process monitoring control system is used for monitoring and controlling the flywheel energy storage frequency modulation system and the molten salt energy storage frequency modulation system; the system comprises a power grid dispatching center RTU, a power plant PMU, a thermal power generating unit DCS, a thermal power flexibility active power balance process control system DCS, a flywheel energy storage and frequency modulation energy management system EMU and a fused salt energy storage and frequency modulation control system DCS; the thermal power flexibility active balance process control system DCS is respectively connected with the power grid dispatching center RTU, the thermal power generating unit DCS, the flywheel energy storage frequency modulation energy management system EMU and the fused salt energy storage frequency modulation control system DCS; and the power plant PMU is connected with a power grid dispatching center RTU, a thermal power generating unit DCS and a flywheel energy storage frequency modulation energy management system EMU.
3. The method for applying the thermal power flexibility multi-source coordination active balance process system according to claim 2, wherein the step of controlling the flywheel energy storage frequency modulation system to provide a power plant rotational inertia or primary frequency modulation active balance service comprises the following steps:
based on power information sent by a power plant PMU, a flywheel energy storage frequency modulation system is adopted to replace a thermal power generating unit to realize primary frequency modulation active power balance service;
based on a dispatching power instruction sent by a power grid dispatching center RTU, a flywheel energy storage frequency modulation system is adopted to independently provide rotational inertia and primary frequency modulation active power balance services for a power grid.
4. The method for applying the thermal power flexibility multi-source coordination 'active balance' process system according to claim 3, wherein the method for achieving the primary frequency modulation 'active balance' service by using the flywheel energy storage frequency modulation system to replace a thermal power unit based on the power information sent by the power plant PMU comprises the following steps:
the method comprises the following steps that a flywheel energy storage frequency modulation energy management system EMU receives a PMU of a power plant and receives energy information of a PCS of a flywheel energy storage array inverter;
the flywheel energy storage frequency modulation energy management system EMU calculates a frequency disturbance quantity according to the received power information of the PMU of the power plant, compares the frequency disturbance quantity with a target frequency, and schedules and controls the charging and discharging power of the PCS of the flywheel energy storage device array inverter;
the method comprises the following steps that a PCS (Power control System) of a flywheel energy storage device array receives a charge-discharge power instruction sent by an EMU (energy management Unit) of a flywheel energy storage frequency modulation, and schedules and controls the charge-discharge power of an FMS (frequency modulation system) of the flywheel energy storage device array;
the FMS receives a charging and discharging power control instruction sent by the flywheel energy storage device array inverter PCS, schedules and controls charging and discharging operation of the flywheel energy storage device, and achieves primary frequency modulation active power balance service.
5. The method for applying the thermal power flexibility multi-source coordination 'active balance' process system according to claim 3, wherein the method for independently providing the rotational inertia and primary frequency modulation 'active balance' service for the power grid by adopting the flywheel energy storage frequency modulation system based on the scheduling power instruction sent by the power grid scheduling center RTU comprises the following steps:
the method comprises the following steps that a power grid dispatching center RTU sends a dispatching power instruction to a flywheel energy storage frequency modulation energy management system EMU through a thermal power flexibility active power balance process control system DCS or directly;
after receiving a scheduling power instruction issued by a thermal power flexibility active balance process control system DCS or a power grid scheduling center RTU, a flywheel energy storage frequency modulation energy management system EMU schedules and controls the charging and discharging power of a flywheel energy storage device array inverter PCS;
after receiving a charging and discharging power instruction sent by a flywheel energy storage frequency modulation energy management system EMU, a flywheel energy storage device array inverter PCS schedules and controls the charging and discharging power of a flywheel energy storage device array management system FMS;
after receiving a charging and discharging power control instruction sent by a flywheel energy storage device array inverter PCS, the flywheel energy storage device array management system FMS schedules and controls charging and discharging operation of the flywheel energy storage device, and realizes that rotational inertia and primary frequency modulation active power balance services are provided for a power grid.
6. The method for applying the thermal power flexibility multi-source coordination 'active balance' process system according to claim 1, wherein the step of fusing a thermal power unit by adopting the flywheel energy storage frequency modulation system and the molten salt energy storage frequency modulation system to provide the multi-source coordination 'active balance' service comprises the following steps:
based on AGC (automatic gain control) regulation target power instruction information of a power grid dispatching center RTU (remote terminal Unit) and generating power state information sent by a DCS (distributed control system) of a thermal power generating unit, providing secondary frequency modulation active power balance service of a power system;
based on an AGC target power regulation instruction of a power grid dispatching center RTU, providing an active balance service of secondary frequency modulation of the power system by fusing a flywheel energy storage frequency modulation system, a flywheel energy storage frequency modulation system and/or a fused salt energy storage frequency modulation system with a thermal power generating unit;
a flywheel energy storage frequency modulation system and a fused salt energy storage frequency modulation system are fused with a thermal power generating unit to form a virtual frequency modulation power supply of a power grid, and the virtual frequency modulation power supply provides power system rotational inertia, frequency modulation, climbing, deep peak shaving or APC (active power balance) services.
7. The method for applying the thermal-power flexibility multi-source coordination 'active balance' process system according to claim 6, wherein the method for providing the secondary frequency modulation 'active balance' service of the power system based on the AGC power instruction information of the RTU of the power grid dispatching center and the generating power state information sent by the DCS of the thermal power generating unit comprises the following steps:
receiving AGC power instruction information sent by a power grid dispatching center RTU and generating power state information sent by a thermal power unit DCS by a thermal power flexibility active balance process control system DCS;
the process control system DCS for thermal power flexibility ' active balance ' analyzes and dispatches and controls the operation of power generation and power utilization ' of the process system DCS for thermal power flexibility ' active balance ' according to the stored energy and the operation state of the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system, the AGC frequency modulation dynamic performance information in the thermal power unit DCS, and the AGC power instruction sent by the power grid dispatching center RTU in real time.
8. The method for applying the thermal power flexibility multi-source coordination 'active balance' process system according to claim 6, wherein the method for providing the secondary frequency modulation 'active balance' service of the power system by fusing a thermal power unit with a flywheel energy storage frequency modulation system, a flywheel energy storage frequency modulation system and/or a molten salt energy storage frequency modulation system based on the AGC (automatic gain control) regulation target power instruction of the power grid dispatching center RTU comprises the following steps:
when the AGC adjustment target power of the RTU of the power grid dispatching center is less than (the real-time frequency modulation power of the flywheel energy storage frequency modulation system + the basic adjustment rate of the unit is multiplied by the rated power of the unit), the flywheel energy storage frequency modulation system is adopted to realize the AGC adjustment target power instruction in combination with the thermal power unit;
when the AGC (automatic gain control) target power of the RTU (real-time frequency modulation power of the flywheel energy storage frequency modulation system + basic set regulation rate x set rated power) of the power grid dispatching center, fusing a thermal power unit with the flywheel energy storage frequency modulation system and the molten salt energy storage frequency modulation system to realize the AGC target power regulation instruction.
9. The method for applying the thermal power flexibility multi-source coordination 'active balance' process system according to claim 8, wherein the method for achieving the AGC adjustment target power instruction by combining the flywheel energy storage frequency modulation system and the thermal power unit comprises the following steps:
determining the adjusting rate of the full-load adjusting range of the thermal power generating unit;
determining the percentage of the remaining electric quantity of the SOC energy storage system of the flywheel energy storage frequency modulation system;
controlling the thermal power generating unit to respond to an AGC (automatic gain control) regulation target power instruction of a power grid dispatching center RTU (remote terminal Unit) according to self capacity;
the method comprises the following steps that a flywheel energy storage frequency modulation energy management system EMU sequentially schedules and controls a flywheel energy storage device array inverter PCS, a flywheel energy storage device array management system FMS, a flywheel energy storage device converter FCS and a flywheel energy storage device to adjust the running of electric power for generation according to the difference between an AGC (automatic gain control) adjustment target power instruction of a power grid scheduling center RTU and the real-time generating power of a thermal power generating unit DCS read by an active balance process control system DCS;
the array bus voltage of the flywheel energy storage device runs at a constant voltage within a rated parameter range, the charge-discharge multiplying power of the flywheel energy storage device is less than or equal to 2C, and C is the capacity of the flywheel energy storage device;
and when the output power of the thermal power generating unit meets an AGC (automatic gain control) target power instruction of a power grid dispatching center RTU (remote terminal Unit), adjusting the flywheel energy storage frequency modulation system to stop the output power, and keeping 50 +/-5% of SOC (state of charge) for standby operation.
10. The method for applying the thermal power flexibility multi-source coordination 'active balance' process system according to claim 8, wherein the method for achieving the AGC adjustment target power instruction by fusing the flywheel energy storage frequency modulation system and the molten salt energy storage frequency modulation system with the thermal power unit comprises the following steps:
if the molten salt electric heating device is in the running state, the following steps:
when the difference between the accumulated online power of the flywheel energy storage and frequency modulation system and the AGC (automatic gain control) target power of the RTU (remote terminal Unit) of the power grid dispatching center is less than or equal to the power regulation capacity of the molten salt electric heating device in the running state, the control method comprises the following steps: determining that the flywheel energy storage frequency modulation system and the thermal power generating unit are combined to adjust the accumulated grid power and operate in a saturated state; taking the fused salt electric heating device as a controllable load, and adjusting the accumulated output power of the fused salt electric heating device, combined with a flywheel energy storage frequency modulation system and a thermal power generating unit to reach the AGC adjustment target power of a power grid dispatching center RTU;
when the difference between the accumulated on-line power of the flywheel energy storage and frequency modulation system and the AGC (automatic gain control) target power of the RTU (remote terminal Unit) of the power grid dispatching center is larger than the power regulation capacity of the molten salt electric heating device in the running state, the control method comprises the following steps: determining that the accumulated grid power of the flywheel energy storage frequency modulation system and the fused salt electric heating device combined thermal power generating unit is in a saturated state; and taking the water-molten salt-steam inversion heat exchange system as a controllable load, and adjusting the accumulated output power of the water-molten salt-steam inversion heat exchange system, the thermal power generating unit combined flywheel energy storage frequency modulation system and the molten salt electric heating device to reach the AGC (automatic gain control) adjustment target power of the RTU (remote terminal unit) of the power grid dispatching center.
If the molten salt electric heating device is in a non-operation state, the following steps:
when the AGC target power regulation instruction of the RTU of the power grid dispatching center is continuously increased in a single direction, controlling a water-molten salt-steam inversion heat exchange system to operate for a plant/industrial steam system, and reducing steam extraction of a steam turbine to increase the power generation power; meanwhile, a water-molten salt-steam inversion heat exchange system is controlled to be operated by a main steam system, and the steam inlet flow of main steam of the steam turbine is increased to increase the power generation power;
and when the AGC target power regulation instruction of the RTU of the power grid dispatching center is continuously reduced in a single direction, controlling the water-molten salt-steam inversion heat exchange system to store the molten salt.
11. The method for applying the thermal power flexibility multi-source coordination 'active balance' process system according to claim 6, wherein a flywheel energy storage frequency modulation system and a molten salt energy storage frequency modulation system are adopted to combine a thermal power unit to form a power grid 'virtual frequency modulation power supply', and a method for providing rotational inertia, frequency modulation, climbing and APC peak regulation 'active balance' services comprises the following steps:
the thermal power flexibility 'active balance' process control system DCS uploads the energy storage capacity related information of a flywheel energy storage frequency modulation energy management system EMU and a fused salt energy storage frequency modulation control system DCS to a power grid dispatching center RTU;
the method comprises the following steps that a power grid dispatching center RTU issues an instruction to a thermal power flexibility active balance process control system DCS, and the thermal power flexibility active balance process control system DCS coordinates a thermal power unit DCS, a dispatching flywheel energy storage frequency modulation energy management system EMU and a molten salt energy storage frequency modulation control system DCS to operate;
the target power increasing direction adjustment sequence is as follows: the flywheel energy storage frequency modulation system is in discharge operation, the fused salt energy storage frequency modulation control system controls the fused salt electric heating device to be in load shedding operation, and the fused salt energy storage device releases heat to cooperate with the water-fused salt-steam inversion heat exchange system to supply auxiliary main steam to the steam turbine to perform power generation operation and supply plant use/industrial steam to perform heat supply operation;
the target power reduction adjustment sequence is: the flywheel energy storage frequency modulation system is in discharge operation, the fused salt energy storage frequency modulation system controls the fused salt electric heating device to carry out load shedding operation, and the fused salt energy storage device cooperates with the water-fused salt-steam inversion heat exchange system to assist the steam turbine to carry out main steam power generation operation and plant/industrial steam heat supply operation.
CN202210269472.1A 2022-03-18 2022-03-18 Application method of flexible multi-source coordinated active balance process system for thermal power Pending CN114597977A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115173438A (en) * 2022-09-08 2022-10-11 西安热工研究院有限公司 Frequency modulation system and method for flywheel energy storage auxiliary thermal power for controllable high-voltage plant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115173438A (en) * 2022-09-08 2022-10-11 西安热工研究院有限公司 Frequency modulation system and method for flywheel energy storage auxiliary thermal power for controllable high-voltage plant
CN115173438B (en) * 2022-09-08 2023-01-13 西安热工研究院有限公司 Frequency modulation system and method for flywheel energy storage auxiliary thermal power for controllable high-voltage plant

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