CN107154645B - Method for enabling residual pressure waste heat generator set to participate in AGC (automatic gain control) adjustment of power plant - Google Patents
Method for enabling residual pressure waste heat generator set to participate in AGC (automatic gain control) adjustment of power plant Download PDFInfo
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- CN107154645B CN107154645B CN201710399000.7A CN201710399000A CN107154645B CN 107154645 B CN107154645 B CN 107154645B CN 201710399000 A CN201710399000 A CN 201710399000A CN 107154645 B CN107154645 B CN 107154645B
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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
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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
- H02J3/381—Dispersed generators
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Abstract
The invention discloses a method for a residual pressure waste heat generator set to participate in AGC adjustment of a power plant, which specifically comprises the following steps: adding a residual pressure waste heat unit at a plant high-pressure section of a power plant unit; respectively interconnecting a small steam turbine speed regulating system and a unit control system of the residual pressure waste heat unit with an RTU (remote terminal Unit) of the power plant; the RTU of the power plant simultaneously sends an AGC instruction to a small steam turbine speed regulating system and a unit set control system; and the residual pressure waste heat unit and the unit set perform output adjustment according to the received instruction. The invention utilizes the load adjustable characteristic of the residual pressure waste heat unit to cooperate with the unit of the power plant to participate in AGC adjustment, thereby greatly improving the adjustment speed and the adjustment precision of the load, reducing the load adjustment time and further greatly improving the adjustment effect.
Description
Technical Field
The invention relates to the technical field of power plants, in particular to an AGC (automatic gain control) adjusting technology of a power plant.
Background
The AGC (automatic generation control) regulation of the power plant refers to the automatic redistribution of the power of the generator set in the control area through the operation of an automatic control program so as to meet the dynamic change of the load in the control area and the balance of the exchange power.
In order to ensure the high-quality, safe and economic operation of the power grid, the North China electric supervision bureau issues two detailed rules to examine and compensate the AGC, and the examination index of the AGC of the power plant has response time (corresponding examination value K)3) Regulating rate (corresponding assessment value K)1) Adjusting precision (corresponding assessment value K)2) And adjusting the depth (corresponding to the assessment value D), wherein the assessment electric quantity and the compensation quantity are directly influenced by the quality of the assessment indexes.
In order to realize the cascade utilization of energy, a residual pressure waste heat power generator set is usually added, the operating principle of the residual pressure waste heat power generator set is that the energy level difference of heating steam extraction of a main steam turbine is utilized to drive a residual pressure waste heat steam turbine to work, a generator is further dragged to generate electricity, the power is used by a plant factory, after a back pressure type steam turbine set is added, the cogeneration advantages can be fully exerted, the steam utilization efficiency is improved, and the purposes of saving energy, reducing consumption and improving the operating benefit are achieved. However, at present, the back-pressure steam turbine set does not participate in AGC adjustment of a power plant, so that the AGC adjustment of the power plant is still based on a traditional method, and the adjustment effect is difficult to be greatly improved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an AGC adjusting method for a power plant, which utilizes the load adjustable characteristic of a residual pressure waste heat unit to realize the auxiliary adjustment of an AGC command received by the unit, and finally further optimizes the AGC adjusting index of the unit, thereby greatly improving the adjusting effect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A method for enabling a residual pressure waste heat generator set to participate in AGC adjustment of a power plant specifically comprises the following steps:
1) a back pressure type steam turbine generator unit is additionally arranged at a plant high-pressure section of a power plant unit, and the excess pressure waste heat is utilized to do work to generate power to form an excess pressure waste heat unit;
2) respectively interconnecting a small steam turbine speed regulating system and a unit control system of the residual pressure waste heat unit with an RTU (remote terminal Unit) of the power plant;
3) the RTU of the power plant simultaneously sends an AGC instruction to a small steam turbine speed regulating system and a unit set control system;
4) and the residual pressure waste heat unit and the unit set perform output adjustment according to the received instruction.
The method for enabling the residual pressure waste heat generator set to participate in AGC adjustment of the power plant comprises the following specific adjustment modes in the step 4):
the residual pressure waste heat unit judges according to self-set parameters after receiving the instruction, and increases the speed according to the speed regulation rate set by the small steam turbine speed regulation system; meanwhile, the unit set accelerates according to the regulation rate set by the unit set control system; when the load rise of the residual pressure waste heat unit does not reach the rated load, the output loads of the unit and the residual pressure waste heat unit reach the regulation requirement of AGC, and the unit and the residual pressure waste heat unit stop the load rise at the same time; when the load rise of the residual pressure waste heat unit reaches the rated load, the output loads of the unit and the residual pressure waste heat unit do not reach the regulation requirement of AGC, the residual pressure waste heat unit stops the load rise, and the unit continues to rise until the load requirement of AGC is reached.
According to the method for the residual pressure waste heat generator set to participate in AGC adjustment of the power plant, when the residual pressure waste heat generator set receives a speed increasing instruction, the residual pressure waste heat generator set is operated at full load, at the moment, the load increasing operation of the residual pressure waste heat generator set is locked, and the load is increased only through the unit set.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
The invention is applied to the automatic power generation control of a power plant, the power generation load of the residual pressure waste heat unit is connected to the high-pressure section for the plant, the load adjustable characteristic of the residual pressure waste heat unit is utilized to cooperate with the unit of the power plant to participate in AGC adjustment, the adjustment speed and the adjustment precision of the load are greatly improved, the load adjustment time is reduced, and the adjustment effect is greatly improved.
Drawings
FIG. 1 is a one-time wiring diagram of the present invention;
FIG. 2 is a control schematic block diagram of the present invention;
fig. 3 is a graph of the regulation of the present invention and a conventional AGC regulation method applied to a power plant.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific examples.
A control principle of the method is shown in figure 2, and an electric processing unit RTU of a power plant controls a residual pressure waste heat unit and a unit to adjust load at the same time.
1) A back pressure type steam turbine generator unit is additionally arranged at a plant high-pressure section of a power plant unit, and as shown in figure 1, the excess pressure waste heat is utilized to do work to generate power to form an excess pressure waste heat unit.
2) Respectively interconnecting a small steam turbine speed regulating system and a unit control system of the residual pressure waste heat unit with an RTU (remote terminal Unit) of the power plant; certainly, the electric processing unit RTU of the power plant is also interconnected with the automatic dispatching system EMS of the medium dispatching in the power plant, and the electric processing unit RTU of the power plant receives the load regulating instruction of the automatic dispatching system EMS of the medium dispatching to control the speed regulating system of the small steam turbine and the unit set control system to regulate the load.
3) And the RTU of the power plant simultaneously sends an AGC instruction to the small steam turbine speed regulating system and the unit set control system.
4) And (4) performing output adjustment on the residual pressure waste heat unit and the unit according to the received instruction, wherein the specific adjustment mode of the step is as follows.
Firstly, judging whether the residual pressure waste heat unit runs at full load before an AGC instruction is issued, if the residual pressure waste heat unit runs at full load, locking the load-increasing operation of the residual pressure waste heat unit, and only increasing the load through the unit; if the load is not in the full load state, the load-up operation and the load-down operation can be carried out.
Under the state that the residual pressure waste heat unit is not fully loaded: if an AGC command issued by an RTU of the power plant to a small steam turbine speed regulating system and a unit set control system at the same time is a speed increasing command, the residual pressure waste heat unit judges according to self-set parameters after receiving the command and increases the speed according to a speed regulating rate set by the small steam turbine speed regulating system; and meanwhile, the unit set accelerates according to the regulation rate set by the unit set control system. In the speed increasing process, when the load increasing of the residual pressure waste heat unit does not reach the rated load, the output loads of the unit and the residual pressure waste heat unit reach the regulation requirement of AGC, and the unit and the residual pressure waste heat unit stop increasing the load at the same time. If the output loads of the unit and the excess pressure waste heat unit do not meet the AGC regulation requirement when the excess pressure waste heat unit rises to the rated load in the speed rising process, the excess pressure waste heat unit stops rising the load, and the unit continues rising the load until the unit reaches the AGC load requirement.
If an AGC command issued by an RTU of the power plant to a small steam turbine speed regulating system and a unit set control system at the same time is a speed reduction command, the residual pressure waste heat unit judges according to self-set parameters after receiving the command, and reduces the speed according to the speed regulation rate set by the small steam turbine speed regulating system; and simultaneously, the unit set performs speed reduction according to the adjusting rate set by the unit set control system.
Specifically, in the embodiment, the rated power of the unit set is set to be 300MW, the rated capacity of the residual pressure waste heat unit is set to be 8MW, and the generated energy is supplied to the service load of the unit set for self use when the unit set stably operates; during normal operation, the residual pressure waste heat unit operates under 4MW capacity, the output of the unit is 246MW, and the output of the unit for AGC reaction is 250 MW.
When a power grid sends a load instruction (AGC) of 260MW, the unit and the residual pressure waste heat unit receive a load increase instruction at the same time, the small steam turbine speed regulating system judges according to self-set parameters after receiving the instruction, the speed is increased (the adjusting range is 0-100%) according to the speed regulating rate set by the small steam turbine speed regulating system, and the unit performs speed increase according to the adjusting rate of the unit control system.
If the proportional relation between the load-lifting rate of the residual pressure waste heat unit and the load-lifting of the unit is 1: 4, speed-up regulation is carried out (the residual pressure waste heat unit is 1MW/min, the unit is 4 MW/min), and when the load of the residual pressure waste heat unit is increased to 6MW, 2MW is increased relative to the whole unit; at the moment, when the output of the unit set is increased by 8WM, the unit set reflects that the AGC load is 260MW, and the requirement of a power grid instruction can be met.
If the residual pressure waste heat unit does not participate in AGC adjustment, the unit needs to be increased by 10MW load to meet the instruction requirement of AGC.
The adjusting curve chart of the invention applied to a power plant together with the traditional AGC adjusting method is shown in figure 3, therefore, the adjusting time of AGC is obviously shortened after the adjusting method of the invention is adopted, and the capacity of the whole unit to pass through the AGC dead zone is enhanced because the residual pressure waste heat unit participates in load adjustment.
When the invention is applied, the adjusting method and the speed-up adjusting process are the same when the AGC command issued by the RTU of the power plant to the small steam turbine speed regulating system and the unit set control system is the speed-down command.
After the invention participates in AGC adjustment of a power plant, the AGC indexes change as follows.
1) Regulating rate K1: the adjusting speed refers to the speed of the time from the moment that the output force of the unit exceeds the response dead zone to the moment that the output force enters the adjusting dead zone in the AGC command direction, namely the adjusting speed in the time.
After the residual pressure waste heat unit participates in load adjustment, the increasing speed of the P2 value is accelerated, so that the adjusting speed is accelerated compared with that before the residual pressure waste heat unit is not added.
The adjustment rate corresponds to a check value K1, and K1 measures the degree of actual speed adjustment compared with the standard rate which the actual speed adjustment should achieve.
When an adjustment amount is added to the original adjustment rate, the adjustment rate is adjusted
The size of the material is increased to be larger,
the value becomes large.
2) Response time K3: the response time refers to the time for the unit to reliably cross the response dead zone consistent with the instruction direction on the basis of the original output after the AGC system sends the instruction.
tj=t1-t0
The response time corresponds to a check value K3, and K3 measures the degree of the actual response time of the unit compared with the standard response time.
When the response tj time becomes shorter after an adjustment amount is added to the original adjustment rate,
the value becomes large.
3) Adjusting the depth D: the output adjustment quantity of the unit according to the AGC instruction direction reflects the contribution of the unit to adjusting the power change of the system, the adjustment depth of the unit is increased after one residual pressure waste heat unit is added, and the D value is increased.
From the above analysis, after the extra-pressure waste heat unit is added to participate in AGC adjustment of the power plant, the evaluation parameter adjustment rate K1, the adjustment precision K2 and the adjustment depth D of the AGC are superior to those of the conventional adjustment mode.
Claims (1)
1. A method for enabling a residual pressure waste heat generator set to participate in AGC adjustment of a power plant is characterized by specifically comprising the following steps:
1) a back pressure type steam turbine generator unit is additionally arranged at a plant high-pressure section of a power plant unit, and the excess pressure waste heat is utilized to do work to generate power to form an excess pressure waste heat unit;
2) respectively interconnecting a small steam turbine speed regulating system and a unit control system of the residual pressure waste heat unit with an RTU (remote terminal Unit) of the power plant;
3) the RTU of the power plant simultaneously sends an AGC instruction to a small steam turbine speed regulating system and a unit set control system;
4) the residual pressure waste heat unit and the unit perform output adjustment according to the received instruction; the specific adjusting mode is as follows:
firstly, judging whether the residual pressure waste heat unit runs at full load before an AGC instruction is issued, if the residual pressure waste heat unit runs at full load, locking the load-increasing operation of the residual pressure waste heat unit, and only increasing the load through the unit; if the load is not in the full load state, the load increasing operation and the load decreasing operation can be carried out;
the residual pressure waste heat unit judges according to self-set parameters after receiving the instruction, and increases the speed according to the regulating rate set by the small steam turbine speed regulating system; meanwhile, the unit set accelerates according to the regulation rate set by the unit set control system;
when the load rise of the residual pressure waste heat unit does not reach the rated load, the output loads of the unit and the residual pressure waste heat unit reach the regulation requirement of AGC, and the unit and the residual pressure waste heat unit stop the load rise at the same time;
when the load rise of the residual pressure waste heat unit reaches the rated load, the output loads of the unit and the residual pressure waste heat unit do not reach the regulation requirement of AGC, the residual pressure waste heat unit stops the load rise, and the unit continues to rise until the load requirement of AGC is reached.
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| CN108900116B (en) * | 2018-06-06 | 2020-06-09 | 三峡大学 | Auxiliary control device and control method for power plant motor |
| CN109188935A (en) * | 2018-07-10 | 2019-01-11 | 长沙国通电力科技有限公司 | A kind of low pressure overbottom pressure cogeneration machine unit automatic generation method and system |
| CN111445141B (en) * | 2020-03-26 | 2023-07-21 | 华润电力技术研究院有限公司 | Load distribution method, system and device of heat supply unit |
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| CN101705318A (en) * | 2009-11-19 | 2010-05-12 | 西安陕鼓动力股份有限公司 | Full-automatic rise speed controlling method of blast furnace gas excess pressure energy recovering device |
| CN102953775A (en) * | 2011-08-23 | 2013-03-06 | 上海漕泾热电有限责任公司 | Automatic power generation control system based on gas-steam combined heat and power supply unit |
| CN102629131A (en) * | 2012-04-18 | 2012-08-08 | 国电科学技术研究院 | Coordinative control method for pulse-mode regulation of condensate flow to participate in frequency modulation |
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Address after: 050000 2nd floor, Yingpan commercial and residential building, 129 Nanxiao street, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee after: Hebei Jiantou energy science and Technology Research Institute Co.,Ltd. Address before: 050000 2nd floor, Yingpan commercial and residential building, 129 Nanxiao street, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee before: HEBEI JI-YAN ENERGY SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |