CN214798886U - System for supplementary frequency modulation of thermal power plant - Google Patents
System for supplementary frequency modulation of thermal power plant Download PDFInfo
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- CN214798886U CN214798886U CN202023341084.5U CN202023341084U CN214798886U CN 214798886 U CN214798886 U CN 214798886U CN 202023341084 U CN202023341084 U CN 202023341084U CN 214798886 U CN214798886 U CN 214798886U
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Abstract
The utility model discloses a system of supplementary frequency modulation of thermal power plant relates to thermal power plant's frequency modulation technical field, and this frequency modulation system includes device two, little transformer, main steam turbine generating set, main transformer, main switch, power frequency electric wire netting, load, the device three that control circuit connects or breaks off that device one, control circuit of little generator, little steam turbine, air inlet adjusting valve, control circuit connect or break off. The utility model discloses sensitive, quick, high-efficient, can further improve energy-conserving level, can improve the regulation performance of unit primary control, AGC, improve main steam turbine generator set's thermal behavior, improve energy-conserving effect and energy utilization efficiency.
Description
Technical Field
The utility model relates to a frequency modulation technical field of thermal power plant especially relates to a system of supplementary frequency modulation of thermal power plant.
Background
On the premise of energy conservation and consumption reduction, a thermal power plant actively excavates internal potential for reducing cost, saving energy and reducing emission, reduces plant power consumption rate by thousands of means and improves the economy of the power plant, and a small generator set is built, so that power supply to plant loads or other equipment is an energy-saving technology implemented at present.
On the other hand, the grid-connected thermal power plant provides functions, performance and auxiliary services of grid-connected operation according to relevant regulations, including frequency modulation services such as primary frequency modulation and Automatic Generation Control (AGC).
The primary frequency modulation is an automatic control process that when the frequency of the power grid deviates from a rated value, a control system of a unit in the power grid automatically controls the increase and decrease of the active power of the unit, limits the change of the power grid frequency and enables the power grid frequency to be stable. When the frequency of the power grid is increased, the primary frequency modulation function requires the unit to rapidly reduce the load by means of heat storage and the like, and conversely, the unit rapidly increases the load. The assessment indexes of the primary frequency modulation generally comprise correct action rate, performance indexes and the like.
Automatic Generation Control (AGC) refers to a service that a generator set tracks a power scheduling instruction within a specified output adjustment range, and adjusts the generated output in real time according to a certain adjustment rate so as to meet the requirements of power system frequency and tie line power control. The evaluation indexes of the AGC generally comprise response time, regulation rate, regulation precision and the like.
The primary frequency modulation and AGC of the thermal power plant act on a thermodynamic system through thermal control, a large response dead zone or an adjustment dead zone exists, the response time is long (generally reaching tens of seconds), the response speed or the adjustment speed is slow, and energy loss exists.
Therefore, those skilled in the art are dedicated to develop an auxiliary frequency modulation system of a thermal power plant, which improves the performance indexes of the primary frequency modulation and AGC of the thermal power plant, reduces energy loss, and improves energy utilization efficiency.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect of prior art, the utility model aims to solve the technical problem how to improve thermal power plant primary control and AGC's regulation performance and energy utilization efficiency, make thermal power plant's primary control, AGC's regulation performance sensitive more, quick, high-efficient.
In order to achieve the purpose, the utility model provides a system for auxiliary frequency modulation of a thermal power plant, which comprises a small generator, a main steam turbine generator set, a main transformer, a main switch, a power frequency grid, a first device for connecting or disconnecting a control circuit, a second device for connecting or disconnecting the control circuit, a small transformer, a load, a third device for connecting or disconnecting the control circuit, a bus, an energy storage device and a fourth device for connecting or disconnecting the control circuit;
furthermore, the outlet of the main steam turbine generator set is electrically connected with the input end of a main transformer, and the output end of the main transformer is electrically connected with a power frequency power grid through a main switch.
Furthermore, the first device for controlling the circuit connection or disconnection, the second device for controlling the circuit connection or disconnection, the third device for controlling the circuit connection or disconnection and the fourth device for controlling the circuit connection or disconnection at least comprise one or more of a circuit breaker and a contactor.
Further, a small generator is driven by a small turbine.
Furthermore, the auxiliary frequency modulation system further comprises a steam inlet adjusting valve, the steam inlet adjusting valve is used for controlling the size of the steam inlet quantity of the small steam turbine, and the small steam turbine is used for driving the small generator to send out alternating current.
Further, the small transformer is electrically connected with the bus through a device for controlling the circuit connection or disconnection.
Further, the small generator is electrically connected with the bus through a second device for controlling the circuit connection or disconnection.
Further, the bus bar is electrically connected to the load through a third device for controlling the connection or disconnection of the circuit.
Further, the bus is electrically connected with the energy storage device through a control circuit connection or disconnection device IV.
The utility model also provides a control method of the system of the supplementary frequency modulation of thermal power plant, this control method is: when receiving an instruction for requiring the main steam turbine generator unit to perform frequency modulation, controlling the opening degree of the steam inlet adjusting valve to increase or decrease the output power of the generator, and/or releasing or absorbing energy by the energy storage device to assist the main steam turbine generator unit to perform the frequency modulation.
And further, when an auxiliary frequency modulation instruction sent by the main steam turbine generator unit when the output power of the main steam turbine generator unit needs to be increased is received, the opening degree of the steam inlet adjusting valve is increased and/or the energy storage device releases energy.
And further, when an auxiliary frequency modulation command sent by the main steam turbine generator unit when the output power of the main steam turbine generator unit needs to be reduced is received, the opening degree of the steam inlet adjusting valve is reduced and/or the energy is absorbed by the energy storage device.
Further, when an auxiliary frequency modulation instruction sent by the main steam turbine generator unit when the output power of the main steam turbine generator unit needs to be increased is received, the energy storage device releases energy and increases the opening degree of the steam inlet adjusting valve.
Further, when an auxiliary frequency modulation instruction sent by the main steam turbine generator unit when the output power of the main steam turbine generator unit needs to be reduced is received, the energy storage device absorbs energy and simultaneously reduces the opening degree of the steam inlet adjusting valve.
Further, the energy storage mode of the energy storage device includes physical energy storage, chemical energy storage or electromagnetic energy storage.
Preferably, the physical stored energy is one or more of compressed air stored energy, flywheel stored energy or rotating equipment stored energy.
Preferably, the chemical stored energy is one or more of a lead acid battery, a redox flow battery, a sodium sulfur battery, or a lithium ion battery.
Preferably, the electromagnetic energy storage comprises: superconducting electromagnetic energy storage or super capacitor energy storage.
Further, the frequency modulation comprises primary frequency modulation and automatic power generation control.
The utility model discloses compare in current energy-conserving technique and primary control, AGC act on thermodynamic system, adjustment unit and exert oneself, there are following advantages:
absorption or release energy through adjusting little steam turbine admission governing valve opening and/or energy memory are used for assisting main steam turbine generating set to carry out the frequency modulation, and the frequency, time or the degree of depth of reducible main steam turbine generating set's primary control or AGC action reduce main steam turbine generating set's thermodynamic system fluctuation and the energy loss who causes to, carry out joint control to little steam turbine, can improve the performance such as the depth of regulation or the control range of main steam turbine generating set frequency modulation, in addition, the utility model discloses an adjustment accuracy is high, and it is little to respond the blind spot or adjust the blind spot promptly, can make sensitive response to the supplementary frequency modulation instruction of receiving.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a system diagram of a preferred embodiment of the present invention;
FIG. 2 is a system diagram of another preferred embodiment of the present invention;
the system comprises a small generator 1, a small turbine 2, a small turbine 201, a steam inlet regulating valve 301, a first device 101 for controlling circuit connection or disconnection, a second device 4 for controlling circuit connection or disconnection, a small transformer 5, a main turbine generator set 6, a main transformer 7, a power frequency grid 701, a main switch 9, a load 901, a third device B1 for controlling circuit connection or disconnection, a bus, an SE1 energy storage device 102 and a fourth device for controlling circuit connection or disconnection.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly understood and appreciated by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.
The first embodiment is as follows:
as shown in fig. 1, the system for auxiliary frequency modulation of a thermal power plant comprises a small generator 1, a second device 101, in which the small generator 1 is connected or disconnected through a control circuit, is electrically connected with a bus B1, a third device 901, in which the bus B1 is connected or disconnected through a control circuit, is electrically connected with a load 9, a small turbine 2, which drives the small generator 1 to generate alternating current, a steam inlet regulating valve 201, which controls the steam inlet quantity of the small turbine 2, a main turbo generator unit 5 and a main transformer 6, wherein the main transformer 6 is electrically connected with a power frequency grid 7 through a main switch 701, and a first device 301, in which the small transformer 4 and the control circuit are connected or disconnected, is electrically connected with a bus B1.
The small generator is driven by the small turbine, and the steam inlet regulating valve controls the steam inlet quantity of the small turbine.
Frequency modulation includes primary frequency modulation and Automatic Generation Control (AGC).
Example two:
the control method of the embodiment one system comprises the following steps: when receiving an instruction for requesting the main steam turbine generator set 5 to perform frequency modulation, the opening degree of the steam inlet adjusting valve 201 is controlled to increase or decrease the output power of the generator, so as to assist the main steam turbine generator set 5 to perform the frequency modulation.
When an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the output power of the main steam turbine generator set 5 needs to be increased is received, the opening degree of the steam inlet adjusting valve 201 is increased;
when an auxiliary frequency modulation instruction sent by the main steam turbine generator unit 5 when the output power of the main steam turbine generator unit 5 needs to be reduced is received, the opening degree of the steam inlet adjusting valve 201 is reduced;
example three: as shown in fig. 2, the system for auxiliary frequency modulation of the thermal power plant comprises a small generator 1, wherein the small generator 1 is electrically connected with a bus B1 through a device II 101 for controlling circuit connection or disconnection, the bus B1 is electrically connected with a load 9 through a device III 901 for controlling circuit connection or disconnection, and a small turbine 2 for driving the small generator 1 to generate alternating current, a steam inlet adjusting valve 201 for controlling the steam inlet quantity of the small turbine 2, a main turbo generator unit 5 and a main transformer 6, and a fourth device 102 for connecting or disconnecting the energy storage device SE1 and the control circuit, wherein the main transformer 6 is electrically connected with the power frequency grid 7 through a main switch 701, the system further comprises a small transformer 4, a first device 301 for connecting or disconnecting the control circuit is electrically connected with a bus B1, and the energy storage device SE1 is electrically connected with a bus B1 through the fourth device 102 for connecting or disconnecting the control circuit.
The small generator is driven by a small turbine.
Frequency modulation includes primary frequency modulation and Automatic Generation Control (AGC).
The energy storage mode of the energy storage device comprises physical energy storage, chemical energy storage or electromagnetic energy storage.
The physical energy storage can be one or more of compressed air energy storage, flywheel energy storage or rotating equipment energy storage.
The chemical energy storage can be one or more of lead-acid batteries, redox flow batteries, sodium-sulfur batteries or lithium ion batteries.
The electromagnetic energy storage can be selected from superconducting electromagnetic energy storage or super capacitor energy storage.
Example four:
the control method of the third system of the embodiment comprises the following steps: when receiving a command for the main steam turbine generator set 5 to perform frequency modulation, the opening degree of the steam inlet adjusting valve 201 is controlled to increase or decrease the output power of the generator, and/or the energy storage device SE1 is adjusted to release or absorb energy to assist the main steam turbine generator set 5 to perform the frequency modulation.
When an auxiliary frequency modulation instruction sent by the main steam turbine generator set 5 when the output power of the main steam turbine generator set 5 needs to be increased is received, the opening degree of the steam inlet adjusting valve 201 is increased, or the energy storage device SE1 releases energy;
or when an auxiliary frequency modulation command which is sent by the main steam turbine generator set 5 and needs to increase the output power of the main steam turbine generator set 5 is received, the opening degree of the steam inlet adjusting valve 201 is increased, and meanwhile, the energy storage device SE1 releases energy.
When an auxiliary frequency modulation command which is sent by the main steam turbine generator unit 5 when the output power of the main steam turbine generator unit 5 needs to be reduced is received, the opening degree of the steam inlet adjusting valve 201 is reduced, or the energy storage device SE1 absorbs energy;
or when an auxiliary frequency modulation command which is sent by the main steam turbine generator set 5 and needs to reduce the output power of the main steam turbine generator set 5 is received, the opening degree of the steam inlet adjusting valve 201 is reduced, and meanwhile, the energy storage device SE1 absorbs energy.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. A system for auxiliary frequency modulation of a thermal power plant is characterized by comprising a small generator, a main steam turbine generator set, a main transformer, a main switch, a power frequency power grid, a first device for controlling circuit connection or disconnection, a second device for controlling circuit connection or disconnection, a small transformer, a load, a third device for controlling circuit connection or disconnection, a bus, an energy storage device and a fourth device for controlling circuit connection or disconnection, wherein an outlet of the main steam turbine generator set is electrically connected with an input end of the main transformer, an output end of the main transformer is electrically connected with the power frequency power grid through the main switch, an outlet of the main steam turbine generator set is electrically connected with the bus through the first device for controlling circuit connection or disconnection by the small transformer, the small generator is electrically connected with the bus through the second device for controlling circuit connection or disconnection, and the bus is electrically connected with the load through the third device for controlling circuit connection or disconnection, and the bus is electrically connected with the energy storage device through a device IV for controlling the circuit connection or disconnection.
2. The system for auxiliary frequency modulation of a thermal power plant as claimed in claim 1, further comprising a small turbine and an admission regulating valve, wherein said small generator is driven by said small turbine, said admission regulating valve is used for controlling the admission amount of said small turbine, and said small turbine is used for driving said small generator to generate ac power.
3. A system for auxiliary frequency modulation of a thermal power plant as claimed in claim 1 wherein said means for controlling circuit connection or disconnection one, means for controlling circuit connection or disconnection two, means for controlling circuit connection or disconnection three, and means for controlling circuit connection or disconnection four comprise at least one of a circuit breaker and a contactor.
4. A system for auxiliary frequency modulation of a thermal power plant as claimed in claim 1 wherein said energy storage means comprises physical or chemical energy storage.
5. A system for auxiliary frequency modulation of a thermal power plant as claimed in claim 4 wherein said physical stored energy is one or more of compressed air stored energy or rotating equipment stored energy.
6. The system of claim 4, wherein the chemical energy storage is one or more of a lead-acid battery, a redox flow battery, a sodium-sulfur battery, or a lithium-ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023341084.5U CN214798886U (en) | 2020-12-31 | 2020-12-31 | System for supplementary frequency modulation of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023341084.5U CN214798886U (en) | 2020-12-31 | 2020-12-31 | System for supplementary frequency modulation of thermal power plant |
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| CN214798886U true CN214798886U (en) | 2021-11-19 |
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| CN202023341084.5U Active CN214798886U (en) | 2020-12-31 | 2020-12-31 | System for supplementary frequency modulation of thermal power plant |
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