CN213990146U - System for improving AGC response capability of thermal generator set - Google Patents
System for improving AGC response capability of thermal generator set Download PDFInfo
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- CN213990146U CN213990146U CN202022910770.3U CN202022910770U CN213990146U CN 213990146 U CN213990146 U CN 213990146U CN 202022910770 U CN202022910770 U CN 202022910770U CN 213990146 U CN213990146 U CN 213990146U
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Abstract
The utility model discloses a system for improve thermal generator set AGC response ability belongs to thermal engineering automation technical field. The system comprises a signal receiving module, a power grid AGC instruction judging module, a control module, an air cooling variable frequency fan frequency adjusting device, a deaerator water supply door opening degree control device and a heat supply pipeline main valve operating mechanism; the signal receiving module is connected with a power grid AGC instruction judging module, the power grid AGC instruction judging module is connected with a control module, and the control module is respectively connected with an air cooling variable frequency fan frequency adjusting device, a deaerator water supply door opening degree control device and a heat supply pipeline main valve operating mechanism; the air cooling frequency conversion fan frequency adjusting device is connected with an air cooling frequency conversion fan of the thermal generator set, the deaerator water supply door opening degree control device is connected with a deaerator water supply door, and the heat supply pipeline main valve control mechanism is connected with the heat supply pipeline main valve. The load of the thermal generator set can be quickly adjusted, the AGC instruction of the power grid is responded, and the safe and stable operation of the power grid is ensured.
Description
Technical Field
The utility model belongs to the technical field of the thermal engineering automation, concretely relates to improve system of thermal generator set AGC response ability.
Background
The AGC response capability is an important index of economy, safety and reliability of current and future power generation and power grids, and with the increasing proportion of renewable energy sources, higher requirements are put forward on the AGC response capability of the coal generating unit. Renewable energy power generation represented by photovoltaic power generation and wind power generation develops rapidly, so that the traditional thermal power industry faces new challenges. The flexible operation technology of foreign thermal power generating units is mature, the lowest deep peak regulation load of Germany thermal power plants reaches 20% (fire coal and biomass), and the climbing capacity is 4% of rated load/min; the ratio of the wind power generation of Denmark is 42%, and the power generation of Denmark is about 50% in 2020 years, the lowest deep peak shaving of the coal-electricity unit is less than 20%, and the climbing capability is 4% of rated load/min. The climbing capacity of the units in other areas is generally 2% of rated load/min, and some units are even lower than 1% of rated load/min, so that the AGC control requirement of a power grid cannot be met. In order to better ensure the safe and stable operation of the power grid and stabilize the impact of new energy power on the power grid, the quick response capability of the power source needs to be continuously increased; thermal power generation still occupies a leading position in the traditional energy structure, so that the improvement of the rapid load-variable operation capacity of the thermal power generating unit is a necessary choice for large-scale admission of new energy power. Although the traditional thermal power generating unit has certain variable load capacity, the variable load rate of the traditional thermal power generating unit still cannot meet the requirement of a power grid.
Disclosure of Invention
In order to solve the problem, an object of the utility model is to provide an improve system of thermal generator set AGC response ability, load that can quick adjustment thermal generator set responds the AGC instruction of electric wire netting, guarantees the safety and stability operation of electric wire netting.
The utility model discloses a realize through following technical scheme:
the utility model discloses a system for improving AGC response capability of a thermal generator set, which comprises a signal receiving module, a power grid AGC instruction judging module, a control module, an air cooling variable frequency fan frequency adjusting device, a deaerator water supply door opening degree control device and a heat supply pipeline main valve operating mechanism;
the signal receiving module is connected with a power grid AGC instruction judging module, the power grid AGC instruction judging module is connected with a control module, and the control module is respectively connected with an air cooling variable frequency fan frequency adjusting device, a deaerator water supply door opening degree control device and a heat supply pipeline main valve operating mechanism; the air cooling frequency conversion fan frequency adjusting device is connected with an air cooling frequency conversion fan of the thermal generator set, the deaerator water supply door opening degree control device is connected with a deaerator water supply door, and the heat supply pipeline main valve control mechanism is connected with the heat supply pipeline main valve.
Preferably, the signal receiving module is a wireless signal receiving module.
Preferably, the grid AGC command determination module includes a threshold comparator.
Preferably, the control module is an industrial PLC.
Preferably, the air-cooling variable frequency fan frequency adjusting device is a fan frequency converter.
Preferably, the control device for the opening degree of the water feeding gate of the deaerator comprises a sequence valve.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a system for improve thermal generator set AGC response ability, judge the back to electric wire netting AGC instruction lift and numerical value change interval through electric wire netting AGC instruction judgement module, control module can pass through air cooling frequency conversion fan frequency adjustment device, the frequency of water gate aperture controlling means and heat supply pipeline main valve operating mechanism respectively to air cooling frequency conversion fan on the oxygen-eliminating device, the aperture of water gate and the aperture of heat supply pipeline main valve are controlled on the oxygen-eliminating device, realize the change of cooling medium's flow, the change of condensate flow and the change of unit power generation, thereby quick adjustment thermal generator set's load, respond the AGC instruction of electric wire netting, guarantee the safe and stable operation of electric wire netting.
Furthermore, the signal receiving module adopts a wireless signal receiving module, so that the signal receiving speed is high, and the response speed of the system is improved.
Furthermore, the air-cooled variable frequency fan frequency adjusting device adopts a fan frequency converter, can realize stepless speed regulation of the fan, can conveniently form a closed-loop control system, realizes control of constant pressure or constant flow, and has low operation energy consumption and high comprehensive benefit.
Further, the control device of the opening degree of the water feeding door of the deaerator comprises a sequence valve, and the control efficiency is high when the deaerator is in partial load.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a control diagram of an embodiment.
In the figure: the system comprises a signal receiving module, a 2-power grid AGC instruction judging module, a 3-control module, a 4-air cooling variable frequency fan frequency adjusting device, a 5-deaerator water supply door opening degree control device and a 6-heat supply pipeline main valve operating mechanism.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, which are included to illustrate and not to limit the present invention:
as shown in fig. 1, the system for improving the AGC response capability of a thermal generator set of the present invention includes a signal receiving module 1, a power grid AGC instruction determining module 2, a control module 3, an air cooling variable frequency fan frequency adjusting device 4, a deaerator water supply door opening degree control device 5 and a heat supply pipeline main valve operating mechanism 6;
the signal receiving module 1 is connected with a power grid AGC instruction judging module 2, the power grid AGC instruction judging module 2 is connected with a control module 3, and the control module 3 is respectively connected with an air cooling variable frequency fan frequency adjusting device 4, a deaerator water supply door opening degree control device 5 and a heat supply pipeline main valve operating mechanism 6; the air cooling frequency conversion fan frequency adjusting device 4 is connected with an air cooling frequency conversion fan of the thermal generator set, the deaerator water feeding door opening degree control device 5 is connected with a deaerator water feeding door, and the heat supply pipeline main valve operating mechanism 6 is connected with a heat supply pipeline main valve.
The signal receiving module 1 is preferably a wireless signal receiving module.
The power grid AGC command judgment module 2 comprises a threshold comparator.
The control module 3 is preferably an industrial PLC.
The air cooling frequency conversion fan frequency adjusting device 4 is preferably a fan frequency converter.
The water feeding door opening control device 5 of the deaerator comprises a sequence valve.
The utility model discloses a theory of operation:
the condensed water throttling technology is provided by Siemens in the 50 th century, and the condensed water amount of a unit is quickly reduced while the air suction of a low-pressure heater is quickly cut off, so that the load is quickly changed. The change of the flow of condensed water caused by the rapid change of the opening degree of a water feeding door of the deaerator enables the load of the unit to change.
The heat supply unit generates electricity and simultaneously uses part of heat for heat supply. The heat supply network comprises a large number of heaters, heat supply pipelines, heat exchangers, user heaters and other equipment, and has huge energy storage capacity. The peak regulation and frequency modulation performance of the unit on a short time scale can be improved by utilizing the part of heat storage. The heat supply amount is reduced in a short time, the energy originally used for heat supply can be used for power generation, the generating power of the unit is rapidly increased, and obvious influence on a heat user can not be caused.
The basic principle of backpressure frequency modulation of a cooling working medium of a condenser is that when boundary conditions are the same as steam parameters, the last stage exhaust pressure of a steam turbine changes to cause the last stage pressure ratio to change, the efficiency of the last stage of the steam turbine changes, the effective enthalpy drop of the last stage work of the steam turbine changes, the power of a unit changes finally, and the principle is that the heat energy of the last stage steam of the steam turbine is activated. The cooling working medium backpressure frequency modulation can be used as an auxiliary frequency modulation technology and is combined with other frequency modulation technologies to ensure the stability of the power grid frequency. For the air cooling unit, the variable frequency fan is basically adopted, the continuous adjustment of the flow of cooling air can be realized by changing the variable frequency rotating speed of the fan, and because the air cooling unit has a plurality of fans and a single fan has low power, the flow of a cooling medium can be conveniently changed through variable frequency control, and the power of the unit can be quickly adjusted.
The working method of the present invention is further explained below by taking the actual operation of 660MW units of a certain thermal power plant as an example:
as shown in fig. 2, when the AGC instruction of the power grid is increased to be more than 2MW and less than 7MW, the opening instruction of the water supply door of the deaerator is reduced by 10%, the instruction of the main valve of the heat supply pipeline is reduced by 10%, and the instruction of the air cooling variable frequency fan is increased by 5%; when the AGC instruction of the power grid is increased by more than or equal to 7MW, the opening instruction of the water feeding door of the deaerator is reduced by 20%, the instruction of the main valve of the heat supply pipeline is reduced by 20%, and the instruction of the air cooling variable frequency fan is increased by 10%, so that the load of the unit can be rapidly increased, and the AGC instruction can be tracked more rapidly. When the AGC instruction of the power grid is reduced by more than 2MW and less than 7MW, the opening instruction of the water supply door of the deaerator is increased by 10%, the main valve instruction of the heat supply pipeline is increased by 10%, and the instruction of the air cooling variable frequency fan is reduced by 5%; when the AGC instruction of the power grid is increased by more than or equal to 7MW, the opening instruction of the water feeding door of the deaerator is increased by 20%, the instruction of the main valve of the heat supply pipeline is increased by 20%, and the instruction of the air cooling variable frequency fan is reduced by 10%, so that the load of the unit can be quickly reduced, and the AGC instruction can be tracked more quickly.
Although some terms are used in the present invention, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the present invention and are to be construed as any additional limitation which is not in accordance with the spirit of the present invention. The above description is only used as an example to further illustrate the content of the present invention, so as to facilitate understanding, but not to represent that the embodiment of the present invention is limited to this, and any technical extension or re-creation according to the present invention is protected by the present invention.
Claims (6)
1. A system for improving AGC response capability of a thermal generator set is characterized by comprising a signal receiving module (1), a power grid AGC instruction judging module (2), a control module (3), an air cooling variable frequency fan frequency adjusting device (4), a deaerator water supply door opening degree control device (5) and a heat supply pipeline main valve operating mechanism (6);
the signal receiving module (1) is connected with a power grid AGC instruction judging module (2), the power grid AGC instruction judging module (2) is connected with a control module (3), and the control module (3) is respectively connected with an air cooling variable frequency fan frequency adjusting device (4), a deaerator water supply door opening degree control device (5) and a heat supply pipeline main valve operating mechanism (6); the air cooling frequency conversion fan frequency adjusting device (4) is connected with an air cooling frequency conversion fan of the thermal generator set, the deaerator water feeding door opening degree control device (5) is connected with a deaerator water feeding door, and the heat supply pipeline main valve operating mechanism (6) is connected with a heat supply pipeline main valve.
2. The system for improving the AGC response capability of the thermal generator set according to claim 1, wherein the signal receiving module (1) is a wireless signal receiving module.
3. The system for improving the AGC response capability of the thermal generator set according to claim 1, wherein the power grid AGC command judgment module (2) comprises a threshold comparator.
4. The system for improving the AGC response capability of the thermal generator set according to claim 1, wherein the control module (3) is an industrial PLC.
5. The system for improving AGC response capability of a thermal generator set according to claim 1, wherein the air-cooled variable frequency fan frequency adjusting device (4) is a fan frequency converter.
6. The system for improving AGC responsiveness of a thermal generator set according to claim 1, wherein the water gate opening control device (5) on the deaerator comprises a sequence valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022910770.3U CN213990146U (en) | 2020-12-07 | 2020-12-07 | System for improving AGC response capability of thermal generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022910770.3U CN213990146U (en) | 2020-12-07 | 2020-12-07 | System for improving AGC response capability of thermal generator set |
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| CN213990146U true CN213990146U (en) | 2021-08-17 |
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| CN202022910770.3U Active CN213990146U (en) | 2020-12-07 | 2020-12-07 | System for improving AGC response capability of thermal generator set |
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