CN114183294A - Back-to-back starting process control method and system for pumped storage power station - Google Patents

Back-to-back starting process control method and system for pumped storage power station Download PDF

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Publication number
CN114183294A
CN114183294A CN202111344261.1A CN202111344261A CN114183294A CN 114183294 A CN114183294 A CN 114183294A CN 202111344261 A CN202111344261 A CN 202111344261A CN 114183294 A CN114183294 A CN 114183294A
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CN
China
Prior art keywords
unit
dragged
dragging
excitation
starting
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Pending
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CN202111344261.1A
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Chinese (zh)
Inventor
陈鹤虎
庞新
郭中元
蒋梦姣
朱冬
施超凡
邱亚鸣
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East China Yixing Pumped Storage Co ltd
Shanghai Minghua Power Technology Co ltd
State Grid Xinyuan Co Ltd
Original Assignee
East China Yixing Pumped Storage Co ltd
Shanghai Minghua Power Technology Co ltd
State Grid Xinyuan Co Ltd
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Application filed by East China Yixing Pumped Storage Co ltd, Shanghai Minghua Power Technology Co ltd, State Grid Xinyuan Co Ltd filed Critical East China Yixing Pumped Storage Co ltd
Priority to CN202111344261.1A priority Critical patent/CN114183294A/en
Publication of CN114183294A publication Critical patent/CN114183294A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B15/00—Controlling
    • F03B15/005—Starting, also of pump-turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy
    • 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
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a back-to-back starting process control method and a back-to-back starting process control system for a pumped storage power station, wherein after a dragged unit starts an inflation water pressing flow, after the inflation water pressing flow is finished, excitation is started, mechanical braking is exited, the dragging unit opens a ball valve, excitation is started, then the dragging unit and a dragged machine start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, after the dragging unit and the dragged unit asynchronously run for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage, so that the unit can rotate without step loss, and meanwhile, the long-term low-speed creeping of the unit can be avoided.

Description

Back-to-back starting process control method and system for pumped storage power station
Technical Field
The invention relates to the technical field of pumped storage power stations, in particular to a back-to-back starting process control method and system for a pumped storage power station.
Background
With the rapid development of modern industry and power industry, the contradiction between the peak-to-valley load difference of a power system is increasingly prominent. With the production of a large-capacity nuclear power unit and the large-scale grid connection of intermittent energy sources such as wind power, solar energy and the like, the uncertainty and randomness of a power supply side bring greater and greater impact to a power grid. The safety, flexibility, adaptability and economy of power grid operation are required to be improved comprehensively when the intelligent power grid is built. Therefore, the power system is urgently required to have stronger peak regulation, frequency modulation, phase modulation and standby capabilities so as to ensure the safe, stable and economic operation of the power system.
The pumped storage power station is one of effective and economic means for solving the problems due to the characteristics of flexibility, rapidness, economy and reliability. When the power grid is in a low-valley load, the pumped-storage power station pumps water to an upstream reservoir to convert the electric energy into potential energy and store the potential energy; when the power grid is in a peak load, the water is discharged to generate electricity, and the electricity is provided for the power grid. Therefore, the pumped storage power station can convert low-value electric energy in the load valley period of the power grid into high-value electric energy in the load peak period, and the static benefit is obvious; the system can provide the functions of peak clipping, valley filling, frequency modulation, phase modulation, emergency standby, rapid load tracking and the like for the power grid at lower cost, and has good dynamic benefit.
The back-to-back starting is a backup starting mode of the working condition of a pump of a unit of the pumped storage power station, the process of the back-to-back starting needs the matching of two units, the back-to-back dragging process is complex, and the back-to-back starting relates to the matching problem of secondary equipment such as monitoring, protection, excitation, a speed regulator and the like. Monitoring synchronization parameters, protecting low-frequency overcurrent parameters, setting exciting current, opening rules of guide vanes of a speed regulator and the like all influence the success rate of back-to-back starting. Therefore, how to increase the success rate of the back-to-back starting of the pumped storage power station is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
Therefore, one embodiment of the invention provides a back-to-back starting process control method for a pumped storage power station, so as to improve the success rate of back-to-back starting of the pumped storage power station.
According to one embodiment of the invention, the back-to-back starting process control method for the pumped storage power station comprises the following steps:
the method is applied to a dragging unit and a dragged unit, wherein the dragged unit is dragged by the dragging unit and is connected to the grid to realize pumping phase modulation starting, the dragged unit runs in a water pump motor mode, the dragging unit runs in a hydraulic generator mode, and the dragging unit and the dragged unit realize dragging by establishing an electric connecting shaft, and the method comprises the following steps of:
after receiving a back-to-back dragging starting instruction sent by an upper computer, the dragged unit analyzes the back-to-back dragging starting instruction and transmits the instruction to the dragging unit, and the dragged unit is switched to an auxiliary equipment operation state;
closing a generator side starting switch of the dragged unit, simultaneously closing a main transformer side starting switch of the dragged unit, and closing a starting bus coupler switch to enable the dragging unit and the dragged unit to transmit dragging torque through an electric shaft formed by a starting bus;
the dragged unit starts an inflation water pressing flow, after the inflation water pressing flow is completed, excitation is started, mechanical braking is quitted, the dragging unit opens a ball valve, and excitation is started;
after the dragging unit and the dragged unit start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, and after the dragging unit and the dragged unit asynchronously operate for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage;
when the rotating speed of the dragged unit is greater than the rated rotating speed of a first preset proportion and the rotating speed of the dragging unit is greater than the rated rotating speed of the first preset proportion, the dragging unit starts synchronous grid connection, a speed regulator is set to be in a phase modulation mode after grid connection, the dragging unit enters a water pumping phase modulation running state, and the dragging unit enters a power generation-to-shutdown process after receiving a GCB (GCB) closing signal of the dragged unit.
After receiving a back-to-back dragging start instruction issued by an upper computer, the dragged unit parses the back-to-back dragging start instruction and transmits the instruction to the dragging unit, and after the step of switching the dragged unit to the operation state of the auxiliary equipment, the method further comprises the following steps:
the dragging unit and the dragged unit both start a generator high-pressure oil system, the speed regulator high-pressure oil system continuously operates, a hydraulic turbine guide bearing oil pump is started, a main shaft sealing water pump is started, a generator space heater is stopped, a motor cooling water valve is developed, a generator oil-water separator is started, a unit technology water supply system is started, and a reset ball valve emergency shut-off valve is used.
The method comprises the following steps that a dragged unit starts an inflation water pressing flow, after the inflation water pressing flow is completed, excitation is started, mechanical braking is quitted, the dragging unit opens a ball valve, and the excitation starting step specifically comprises the following steps:
when the dragging unit receives a back-to-back dragging machine mode command, the dragging unit closes a de-excitation switch;
when the dragged unit receives a back-to-back dragged unit mode command, the dragged unit closes a demagnetization switch;
after the driven unit de-excitation switch is switched on, delaying preset time and putting the driven unit into excitation, and setting excitation current as a first preset value;
after the dragged unit is excited, and the exciting current is set to be a second preset value;
the dragging unit and the dragged unit establish synchronous electromagnetic torque;
and a guide vane of the dragging unit is opened, and the dragged unit and the dragging unit synchronously accelerate under the action of synchronous electromagnetic torque.
Wherein the first preset value and the second preset value satisfy the following conditional expressions:
1.05＜I1/I2＜1.5；
wherein, I1Is the first preset value, I2The second preset value is obtained.
Wherein, the stator of dragging the unit is opened, after the step that the unit dragged and the unit dragging the synchronous acceleration of unit under the effect of synchronous electromagnetic moment, the method also includes:
when the rotating speed of the dragged unit is greater than the rated rotating speed of a second preset proportion, activating a synchronizing device of the dragged unit, and adjusting the excitation of the dragging unit through the synchronizing device until the voltage of the dragging unit and the voltage of a power grid are within an allowable switching-on range;
and setting the excitation of the dragged unit as voltage loop control, and exiting the excitation of the dragged unit at the same time.
According to the back-to-back starting process control method for the pumped storage power station, provided by the embodiment of the invention, after a dragged unit starts an inflation water pressing flow, and the inflation water pressing flow is finished, excitation is started, mechanical braking is exited, the dragging unit opens a ball valve, excitation is started, then after the dragging unit and the dragged unit start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, after the dragging unit and the dragged unit asynchronously run for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage, so that the unit can rotate, no step loss is caused, and meanwhile, the unit can be prevented from creeping at a low speed for a long time; after the unit establishes rotational inertia, the opening rate of the guide vane is controlled, the synchronization of the dragging unit and the dragged unit can be ensured, in addition, after a de-excitation switch of the dragged unit is switched on, the dragged unit is switched on for delaying preset time, and excitation current is set to be a first preset value; after the excitation of the dragged unit is put into use, and the excitation current is set to be in a second preset value constant excitation current starting mode, so that the transmission of electromagnetic torque of the unit can be effectively guaranteed, and the success rate of back-to-back starting of the pumped storage power station is finally improved.
Another embodiment of the present invention provides a back-to-back starting process control system for a pumped storage power station to improve the success rate of back-to-back starting of the pumped storage power station.
The back-to-back starting process control system for the pumped storage power station comprises a dragging unit and a dragged unit, wherein the dragged unit is dragged by the dragging unit to be connected to the grid to realize pumped phase modulation starting, the dragged unit runs in a water pump motor mode, the dragging unit runs in a hydro-generator mode, and the dragging unit and the dragged unit realize dragging through establishing an electric connecting shaft:
the dragged unit is used for analyzing the back-to-back dragging starting instruction after receiving the back-to-back dragging starting instruction sent by the upper computer, transmitting the instruction to the dragging unit, and switching the dragged unit to an auxiliary equipment running state;
closing a generator side starting switch of the dragged unit, simultaneously closing a main transformer side starting switch of the dragged unit, and closing a starting bus coupler switch to enable the dragging unit and the dragged unit to transmit dragging torque through an electric shaft formed by a starting bus;
the dragged unit is used for starting an inflation water pressing process, after the inflation water pressing process is finished, excitation is started, mechanical braking is quitted, the dragging unit opens a ball valve, and excitation is started;
after the dragging unit and the dragged unit start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, and after the dragging unit and the dragged unit asynchronously operate for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage;
when the rotating speed of the dragged unit is greater than the rated rotating speed of a first preset proportion and the rotating speed of the dragging unit is greater than the rated rotating speed of the first preset proportion, the dragging unit starts synchronous grid connection, a speed regulator is set to be in a phase modulation mode after grid connection, the dragging unit enters a water pumping phase modulation running state, and the dragging unit enters a power generation-to-shutdown process after receiving a GCB (GCB) closing signal of the dragged unit.
After the dragged unit is switched to the operation state of the auxiliary equipment, the dragging unit and the dragged unit both start a generator high-pressure oil system, the speed governor high-pressure oil system continuously operates, a hydraulic turbine guide bearing oil pump is started, a main shaft sealing water pump is started, a generator space heater is stopped, a motor cooling water valve is developed, a generator oil-water separator is started, a unit technology water supply system is started, and a reset ball valve is used for emergently closing the valve.
The system comprises a dragging unit, a magnetic field elimination switch and a magnetic field elimination switch, wherein the dragging unit is used for closing the magnetic field elimination switch when receiving a back-to-back dragging machine mode command;
the dragged unit is used for switching on a demagnetization switch when receiving a back-to-back dragged unit mode command;
after the driven unit de-excitation switch is switched on, delaying preset time and putting the driven unit into excitation, and setting excitation current as a first preset value;
after the dragged unit is excited, and the exciting current is set to be a second preset value;
the dragging unit and the dragged unit establish synchronous electromagnetic torque;
and a guide vane of the dragging unit is opened, and the dragged unit and the dragging unit synchronously accelerate under the action of synchronous electromagnetic torque.
Wherein the first preset value and the second preset value satisfy the following conditional expressions:
1.05＜I1/I2＜1.5；
wherein, I1Is the first preset value, I2The second preset value is obtained.
When the rotating speed of the dragged unit is greater than the rated rotating speed of a second preset proportion, activating a synchronizing device of the dragged unit, and adjusting the excitation of the dragged unit through the synchronizing device until the voltage of the dragged unit and the voltage of a power grid are within an allowable switching-on range;
and setting the excitation of the dragged unit as voltage loop control, and exiting the excitation of the dragged unit at the same time.
According to the back-to-back starting process control system for the pumped storage power station, provided by the embodiment of the invention, after a dragged unit starts an inflation water pressing flow, and the inflation water pressing flow is finished, excitation is started, mechanical braking is exited, the dragging unit opens a ball valve, excitation is started, then after the dragging unit and the dragged unit start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, after the dragging unit and the dragged unit asynchronously run for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage, so that the units can rotate, no step loss is caused, and meanwhile, the long-term low-speed creeping of the units can be avoided; after the unit establishes rotational inertia, the opening rate of the guide vane is controlled, the synchronization of the dragging unit and the dragged unit can be ensured, in addition, after a de-excitation switch of the dragged unit is switched on, the dragged unit is switched on for delaying preset time, and excitation current is set to be a first preset value; after the excitation of the dragged unit is put into use, and the excitation current is set to be in a second preset value constant excitation current starting mode, so that the transmission of electromagnetic torque of the unit can be effectively guaranteed, and the success rate of back-to-back starting of the pumped storage power station is finally improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of embodiments of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of controlling a back-to-back startup process for a pumped-storage power plant according to a first embodiment of the present invention;
fig. 2 is a detailed flowchart of step S103 in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, a back-to-back starting process control method for a pumped storage power station according to a first embodiment of the present invention is applied to a dragging unit and a dragged unit, the dragged unit is dragged by the dragging unit to be connected to a grid to realize pumped phase modulation starting, the dragged unit operates in a water pump motor manner, the dragging unit operates in a water turbine generator manner, and the dragging unit and the dragged unit realize dragging by establishing an electrical connection shaft, and the method includes steps S101 to S105.
S101, after receiving a back-to-back dragging starting instruction sent by an upper computer, the dragged unit analyzes the back-to-back dragging starting instruction and transmits the instruction to the dragging unit, and the dragged unit is switched to an auxiliary device running state.
And S102, closing a generator side starting switch of the dragged unit, closing a main transformer side starting switch of the dragging unit, and closing a starting bus coupler switch, so that the dragging unit and the dragged unit transmit dragging torque through an electric shaft formed by a starting bus.
S103, starting an inflation water pressing process by the dragged unit, starting excitation after the inflation water pressing process is completed, quitting mechanical braking, opening a ball valve by the dragged unit, and starting excitation.
Referring to fig. 2, the dragged unit starts an inflation and water pressurization process, after the inflation and water pressurization process is completed, excitation is started, mechanical braking is exited, the dragging unit opens a ball valve, and the step of starting excitation specifically includes steps of S1031 to S1036:
s1031, when the dragging unit receives a back-to-back dragging machine mode command, the dragging unit closes a de-excitation switch;
s1032, when the dragged unit receives a back-to-back dragged unit mode command, the dragged unit closes a de-excitation switch;
s1033, after the demagnetizing switch of the dragged unit is switched on, delaying preset time and putting the dragged unit into excitation, and setting excitation current as a first preset value;
for example, the delay time of 30s is put into the excitation of the driven unit, and the excitation current is set to be a first preset value.
S1034, after the dragged unit is excited, exciting the dragged unit, and setting exciting current as a second preset value;
wherein the first preset value and the second preset value satisfy the following conditional expressions:
1.05＜I1/I2＜1.5：
wherein, I1Is the first preset value, I2The second preset value is obtained.
In the present embodiment, specifically, I1/I2＝1.2。
S1035, establishing synchronous electromagnetic torque between the dragging unit and the dragged unit;
and S1036, opening guide vanes of the dragging unit, and enabling the dragged unit to synchronously accelerate with the dragging unit under the action of synchronous electromagnetic torque.
Optionally, after the guide vane of the dragging unit is opened, and the dragged unit and the dragging unit synchronously increase speed under the action of the synchronous electromagnetic torque, the method further includes:
when the rotating speed of the dragged unit is greater than the rated rotating speed of a second preset proportion, activating a synchronizing device of the dragged unit, adjusting the excitation of the dragging unit through the synchronizing device until the voltage of the dragging unit and the voltage of a power grid are within an allowable closing range, for example, when the rotating speed of the dragged unit is greater than 95% of the rated rotating speed, activating the synchronizing device of the dragged unit, and adjusting the excitation of the dragging unit through the synchronizing device until the voltage of the dragging unit and the voltage of the power grid are within the allowable closing range;
and then setting the excitation of the dragged unit as voltage loop control, and exiting the excitation of the dragged unit at the same time.
And S104, after the dragging unit and the dragged unit start excitation, the speed regulator of the dragging unit starts guide vanes according to a preset scheme in a back-to-back mode, and after the dragging unit and the dragged unit asynchronously run for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage.
S105, when the rotating speed of the dragged unit is greater than the rated rotating speed of a first preset proportion, and the rotating speed of the dragging unit is greater than the rated rotating speed of the first preset proportion, the dragging unit starts synchronous grid connection, a speed regulator is set to be in a phase modulation mode after grid connection, the dragging unit enters a water pumping phase modulation operation state, and the dragging unit enters a power generation-to-shutdown process after receiving a GCB (general packet bus) closing signal of the dragged unit. For example, when the rotating speed of the dragged unit is greater than 96% of the rated rotating speed and the rotating speed of the dragging unit is greater than 96% of the rated rotating speed, the dragging unit starts synchronous grid connection, a speed regulator is set to be in a phase modulation mode after grid connection, the dragging unit enters a water pumping phase modulation operation state, and the dragging unit enters a power generation-to-shutdown process after receiving a GCB closing signal of the dragged unit.
In addition, as a specific example, after the dragged unit receives a back-to-back dragging start instruction issued by an upper computer, the back-to-back dragging start instruction is analyzed, and the instruction is transmitted to the dragging unit, and after the step of switching the dragged unit to the operating state of the auxiliary device, the method further includes:
the dragging unit and the dragged unit both start a generator high-pressure oil system, the speed regulator high-pressure oil system continuously operates, a hydraulic turbine guide bearing oil pump is started, a main shaft sealing water pump is started, a generator space heater is stopped, a motor cooling water valve is developed, a generator oil-water separator is started, a unit technology water supply system is started, and a reset ball valve emergency shut-off valve is used.
According to the back-to-back starting process control method for the pumped storage power station, after a dragged unit starts an inflation water pressing flow and finishes the inflation water pressing flow, excitation is started, mechanical braking is quitted, the dragging unit opens a ball valve, excitation is started, then a dragging unit and the dragged unit start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, after the dragging unit and the dragged unit run asynchronously for a preset time, the dragged unit is dragged into a synchronous acceleration stage by the dragging unit, so that the unit can rotate, no desynchronization is caused, and long-term low-speed creeping of the unit can be avoided; after the unit establishes rotational inertia, the opening rate of the guide vane is controlled, the synchronization of the dragging unit and the dragged unit can be ensured, in addition, after a de-excitation switch of the dragged unit is switched on, the dragged unit is switched on for delaying preset time, and excitation current is set to be a first preset value; after the excitation of the dragged unit is put into use, and the excitation current is set to be in a second preset value constant excitation current starting mode, so that the transmission of electromagnetic torque of the unit can be effectively guaranteed, and the success rate of back-to-back starting of the pumped storage power station is finally improved.
Based on the same inventive concept, a second embodiment of the present invention provides a back-to-back starting process control system for a pumped storage power station, including a dragging unit and a dragged unit, where the dragged unit is dragged by the dragging unit to be connected to a grid to realize pumped phase modulation starting, the dragged unit operates in a water pump motor manner, the dragging unit operates in a hydro-generator manner, and the dragging unit and the dragged unit realize dragging by establishing an electrical connection shaft:
the dragged unit is used for analyzing the back-to-back dragging starting instruction after receiving the back-to-back dragging starting instruction sent by the upper computer, transmitting the instruction to the dragging unit, and switching the dragged unit to an auxiliary equipment running state;
closing a generator side starting switch of the dragged unit, simultaneously closing a main transformer side starting switch of the dragged unit, and closing a starting bus coupler switch to enable the dragging unit and the dragged unit to transmit dragging torque through an electric shaft formed by a starting bus;
the dragged unit is used for starting an inflation water pressing process, after the inflation water pressing process is finished, excitation is started, mechanical braking is quitted, the dragging unit opens a ball valve, and excitation is started;
after the dragging unit and the dragged unit start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, and after the dragging unit and the dragged unit asynchronously operate for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage;
when the rotating speed of the dragged unit is greater than the rated rotating speed of a first preset proportion and the rotating speed of the dragging unit is greater than the rated rotating speed of the first preset proportion, the dragging unit starts synchronous grid connection, a speed regulator is set to be in a phase modulation mode after grid connection, the dragging unit enters a water pumping phase modulation running state, and the dragging unit enters a power generation-to-shutdown process after receiving a GCB (GCB) closing signal of the dragged unit.
In this embodiment, after the dragged unit is switched to the operating state of the auxiliary device, the dragging unit and the dragged unit both start the high-pressure oil system of the generator, the high-pressure oil system of the speed governor continuously operates, the oil pump of the hydraulic turbine guide bearing is started, the main shaft seal water pump is started, the generator space heater is stopped, the motor cooling water valve is developed, the oil-water separator of the generator is started, the unit technical water supply system is started, and the reset ball valve promptly closes the valve.
In this embodiment, the dragging unit is configured to close a demagnetization switch when receiving a back-to-back dragging machine mode command;
the dragged unit is used for switching on a demagnetization switch when receiving a back-to-back dragged unit mode command;
after the driven unit de-excitation switch is switched on, delaying preset time and putting the driven unit into excitation, and setting excitation current as a first preset value;
after the dragged unit is excited, and the exciting current is set to be a second preset value;
the dragging unit and the dragged unit establish synchronous electromagnetic torque;
and a guide vane of the dragging unit is opened, and the dragged unit and the dragging unit synchronously accelerate under the action of synchronous electromagnetic torque.
In this embodiment, the first preset value and the second preset value satisfy the following conditional expression:
1.05＜I1/I2＜1.5；
wherein, I1Is the first preset value, I2The second preset value is obtained.
In this embodiment, when the rotating speed of the dragged unit is greater than the rated rotating speed of a second preset proportion, a synchronization device of the dragged unit is activated, and the excitation of the dragged unit is adjusted by the synchronization device until the voltage of the dragged unit and the voltage of the power grid are within an allowable closing range;
and setting the excitation of the dragged unit as voltage loop control, and exiting the excitation of the dragged unit at the same time.
According to the back-to-back starting process control system for the pumped storage power station, after a dragged unit starts an inflation water pressing flow and finishes the inflation water pressing flow, excitation is started, mechanical braking is quitted, the dragging unit opens a ball valve, excitation is started, then a speed regulator of the dragging unit and the dragged unit start excitation, a guide vane is opened according to a preset scheme in a back-to-back mode, after the dragging unit and the dragged unit run asynchronously for a preset time, the dragged unit is dragged by the dragging unit to enter a synchronous acceleration stage synchronously, so that the units can rotate, no desynchronization is caused, and long-term low-speed creeping of the units can be avoided; after the unit establishes rotational inertia, the opening rate of the guide vane is controlled, the synchronization of the dragging unit and the dragged unit can be ensured, in addition, after a de-excitation switch of the dragged unit is switched on, the dragged unit is switched on for delaying preset time, and excitation current is set to be a first preset value; after the excitation of the dragged unit is put into use, and the excitation current is set to be in a second preset value constant excitation current starting mode, so that the transmission of electromagnetic torque of the unit can be effectively guaranteed, and the success rate of back-to-back starting of the pumped storage power station is finally improved.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A back-to-back starting process control method for a pumped storage power station is applied to a dragging unit and a dragged unit, the dragged unit is dragged by the dragging unit to be connected to a grid to realize pumped phase modulation starting, the dragged unit runs in a water pump motor mode, the dragging unit runs in a hydro-generator mode, the dragging unit and the dragged unit realize dragging through establishing an electric connecting shaft, and the method comprises the following steps:
after receiving a back-to-back dragging starting instruction sent by an upper computer, the dragged unit analyzes the back-to-back dragging starting instruction and transmits the instruction to the dragging unit, and the dragged unit is switched to an auxiliary equipment operation state;
closing a generator side starting switch of the dragged unit, simultaneously closing a main transformer side starting switch of the dragged unit, and closing a starting bus coupler switch to enable the dragging unit and the dragged unit to transmit dragging torque through an electric shaft formed by a starting bus;
the dragged unit starts an inflation water pressing flow, after the inflation water pressing flow is completed, excitation is started, mechanical braking is quitted, the dragging unit opens a ball valve, and excitation is started;
after the dragging unit and the dragged unit start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, and after the dragging unit and the dragged unit asynchronously operate for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage;
when the rotating speed of the dragged unit is greater than the rated rotating speed of a first preset proportion and the rotating speed of the dragging unit is greater than the rated rotating speed of the first preset proportion, the dragging unit starts synchronous grid connection, a speed regulator is set to be in a phase modulation mode after grid connection, the dragging unit enters a water pumping phase modulation running state, and the dragging unit enters a power generation-to-shutdown process after receiving a GCB (GCB) closing signal of the dragged unit.
2. The method according to claim 1, wherein after the dragged unit receives a back-to-back dragging start command issued by an upper computer, the back-to-back dragging start command is analyzed and transmitted to the dragging unit, and after the step of switching the dragged unit to the operating state of the auxiliary device, the method further comprises:
the dragging unit and the dragged unit both start a generator high-pressure oil system, the speed regulator high-pressure oil system continuously operates, a hydraulic turbine guide bearing oil pump is started, a main shaft sealing water pump is started, a generator space heater is stopped, a motor cooling water valve is developed, a generator oil-water separator is started, a unit technology water supply system is started, and a reset ball valve emergency shut-off valve is used.
3. The back-to-back starting process control method for the pumped storage power station as claimed in claim 1, wherein the dragged unit starts an air-inflation water-pressurization flow, after the air-inflation water-pressurization flow is completed, excitation is started, mechanical braking is exited, the dragging unit opens a ball valve, and the step of starting excitation specifically comprises:
when the dragging unit receives a back-to-back dragging machine mode command, the dragging unit closes a de-excitation switch;
when the dragged unit receives a back-to-back dragged unit mode command, the dragged unit closes a demagnetization switch;
after the driven unit de-excitation switch is switched on, delaying preset time and putting the driven unit into excitation, and setting excitation current as a first preset value;
after the dragged unit is excited, and the exciting current is set to be a second preset value;
the dragging unit and the dragged unit establish synchronous electromagnetic torque;
and a guide vane of the dragging unit is opened, and the dragged unit and the dragging unit synchronously accelerate under the action of synchronous electromagnetic torque.
4. The back-to-back startup process control method for a pumped-storage power plant of claim 3, wherein the first preset value and the second preset value satisfy the following conditional:
1.05＜I1/I2＜1.5；
wherein, I1Is the first preset value, I2The second preset value is obtained.
5. The back-to-back startup process control method for a pumped-storage power station of claim 3, wherein the guide vanes of the pulling unit are opened, and after the step of synchronously accelerating the pulled unit and the pulling unit under the action of the synchronous electromagnetic torque, the method further comprises:
when the rotating speed of the dragged unit is greater than the rated rotating speed of a second preset proportion, activating a synchronizing device of the dragged unit, and adjusting the excitation of the dragging unit through the synchronizing device until the voltage of the dragging unit and the voltage of a power grid are within an allowable switching-on range;
and setting the excitation of the dragged unit as voltage loop control, and exiting the excitation of the dragged unit at the same time.
6. The utility model provides a back-to-back start-up process control system for pumped storage power station, its characterized in that, includes drags the unit and is dragged the unit, dragged the unit by drags the unit and drags the grid-connected realization pumped phase modulation and start, dragged the unit and move with the pump motor mode, drags the unit and moves with hydraulic generator mode, drag the unit with dragged the unit and realize dragging through establishing electric connecting axle:
the dragged unit is used for analyzing the back-to-back dragging starting instruction after receiving the back-to-back dragging starting instruction sent by the upper computer, transmitting the instruction to the dragging unit, and switching the dragged unit to an auxiliary equipment running state;
closing a generator side starting switch of the dragged unit, simultaneously closing a main transformer side starting switch of the dragged unit, and closing a starting bus coupler switch to enable the dragging unit and the dragged unit to transmit dragging torque through an electric shaft formed by a starting bus;
the dragged unit is used for starting an inflation water pressing process, after the inflation water pressing process is finished, excitation is started, mechanical braking is quitted, the dragging unit opens a ball valve, and excitation is started;
after the dragging unit and the dragged unit start excitation, a speed regulator of the dragging unit opens a guide vane according to a preset scheme in a back-to-back mode, and after the dragging unit and the dragged unit asynchronously operate for a preset time, the dragged unit is dragged by the dragging unit to synchronously enter a synchronous acceleration stage;
when the rotating speed of the dragged unit is greater than the rated rotating speed of a first preset proportion and the rotating speed of the dragging unit is greater than the rated rotating speed of the first preset proportion, the dragging unit starts synchronous grid connection, a speed regulator is set to be in a phase modulation mode after grid connection, the dragging unit enters a water pumping phase modulation running state, and the dragging unit enters a power generation-to-shutdown process after receiving a GCB (GCB) closing signal of the dragged unit.
7. The back-to-back startup process control system for a pumped-storage power plant of claim 6, wherein:
after the dragged unit is switched to the operation state of the auxiliary equipment, the dragging unit and the dragged unit both start a generator high-pressure oil system, a speed regulator high-pressure oil system continuously operates, a hydraulic turbine guide bearing oil pump is started, a main shaft seal water pump is started, a generator space heater is stopped, a motor cooling water valve is developed, a generator oil-water separator is started, a unit technical water supply system is started, and a reset ball valve is used for emergently closing the valve.
8. The back-to-back startup process control system for a pumped-storage power plant of claim 7, wherein:
the dragging unit is used for switching on a field suppression switch when receiving a back-to-back dragging machine mode command;
the dragged unit is used for switching on a demagnetization switch when receiving a back-to-back dragged unit mode command;
after the driven unit de-excitation switch is switched on, delaying preset time and putting the driven unit into excitation, and setting excitation current as a first preset value;
after the dragged unit is excited, and the exciting current is set to be a second preset value;
the dragging unit and the dragged unit establish synchronous electromagnetic torque;
and a guide vane of the dragging unit is opened, and the dragged unit and the dragging unit synchronously accelerate under the action of synchronous electromagnetic torque.
9. The back-to-back startup process control system for a pumped-storage power plant of claim 8, wherein the first and second preset values satisfy the following conditional:
1.05＜I1/I2＜1.5；
wherein, I1Is the first preset value, I2The second preset value is obtained.
10. The back-to-back startup process control system for a pumped-storage power plant of claim 8, wherein:
when the rotating speed of the dragged unit is greater than the rated rotating speed of a second preset proportion, activating a synchronizing device of the dragged unit, and adjusting the excitation of the dragging unit through the synchronizing device until the voltage of the dragging unit and the voltage of a power grid are within an allowable switching-on range;
and setting the excitation of the dragged unit as voltage loop control, and exiting the excitation of the dragged unit at the same time.
CN202111344261.1A 2021-11-12 2021-11-12 Back-to-back starting process control method and system for pumped storage power station Pending CN114183294A (en)

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