CN112803435A - System and control method for auxiliary frequency modulation of thermal power plant - Google Patents
System and control method for auxiliary frequency modulation of thermal power plant Download PDFInfo
- Publication number
- CN112803435A CN112803435A CN202011632594.XA CN202011632594A CN112803435A CN 112803435 A CN112803435 A CN 112803435A CN 202011632594 A CN202011632594 A CN 202011632594A CN 112803435 A CN112803435 A CN 112803435A
- Authority
- CN
- China
- Prior art keywords
- frequency modulation
- steam turbine
- small
- power plant
- thermal power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
-
- 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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Control Of Eletrric Generators (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a system and a control method for auxiliary frequency modulation of a thermal power plant, and relates to the technical field of frequency modulation of the thermal power plant. The invention is sensitive, fast and efficient, can further improve the energy-saving level, can improve the primary frequency modulation and AGC regulation performance of the generator set, improves the thermal performance of the main steam turbine generator set, and improves the energy-saving effect and the energy utilization efficiency.
Description
Technical Field
The invention relates to the technical field of frequency modulation of a thermal power plant, in particular to a system and a control method for auxiliary frequency modulation of the 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 a system and a control method for auxiliary frequency modulation of a thermal power plant, so as to improve performance indexes of primary frequency modulation and AGC of the thermal power plant, reduce energy loss, and improve energy utilization efficiency.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is how to improve the adjustment performance and energy utilization efficiency of the primary frequency modulation and AGC of the thermal power plant, so that the adjustment performance of the primary frequency modulation and AGC of the thermal power plant is more sensitive, faster and more efficient.
In order to achieve the purpose, the invention provides an auxiliary frequency modulation system 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 controlling the connection or disconnection of a circuit, a second device for controlling the connection or disconnection of the circuit, a small transformer, a load, a third device for controlling the connection or disconnection of the circuit and a bus;
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 and the third 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.
Furthermore, a device for connecting or disconnecting through a control circuit is also arranged on the bus and electrically connected with the energy storage device.
Further, the device for controlling the connection or disconnection of the circuit comprises one or more of a circuit breaker and a contactor.
The invention also provides a control method of the system for auxiliary frequency modulation of the thermal power plant, which comprises the following steps: when an instruction for requiring the main steam turbine generator unit to perform frequency modulation is received, the opening degree of the steam inlet adjusting valve is controlled to increase or decrease the output power of the generator so as 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 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.
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/or increases the opening degree of the steam inlet adjusting valve.
Further, when an auxiliary frequency modulation command which is 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/or 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.
Compared with the prior art, the invention has the following advantages that the energy-saving technology, the primary frequency modulation and AGC (automatic gain control) are acted on a thermodynamic system and the output of a regulating unit:
the small steam turbine is controlled in a combined mode, so that the performance of the adjustment depth or the adjustment range of the frequency modulation of the main steam turbine generator set can be improved, in addition, the adjustment precision is high, namely the response dead zone or the adjustment dead zone is small, and sensitive response can be made to the received auxiliary frequency modulation instruction.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings 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 and easily understood 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 set forth 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.
And 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.
And 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.
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.
The fourth device 102 for controlling the connection or disconnection of the circuit comprises one or more of a circuit breaker and a contactor.
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 detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
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 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 and a bus;
the outlet of the main steam turbine generator set is electrically connected with the input end of the main transformer, and the output end of the main transformer is electrically connected with the power frequency power grid through the main switch.
2. A system for auxiliary frequency modulation of a thermal power plant as claimed in claim 1 wherein said small generator is driven by a small turbine;
the auxiliary frequency modulation system further comprises a steam inlet adjusting valve, the steam inlet adjusting valve is used for controlling 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.
3. A system for auxiliary frequency modulation of a thermal power plant as claimed in claim 1 wherein said small transformer is electrically connected to said bus by means for connecting or disconnecting said control circuit.
4. A system for auxiliary frequency modulation of a thermal power plant as claimed in claim 1 wherein said small generator is electrically connected to said bus by means for connecting or disconnecting said control circuit.
5. A system for auxiliary frequency modulation of a thermal power plant as claimed in claim 1 wherein said bus bar is electrically connected to said load through means for connecting or disconnecting said control circuit.
6. A system for auxiliary frequency modulation of a thermal power plant as claimed in claim 1 wherein said first means for controlling circuit connection or disconnection, said second means for controlling circuit connection or disconnection, and said third means for controlling circuit connection or disconnection comprise at least one or more of circuit breakers and contactors.
7. A method for controlling a system for auxiliary frequency modulation of a thermal power plant according to any of claims 3-6, characterized in that the method comprises: when an instruction for requiring the main steam turbine generator unit to perform frequency modulation is received, the opening degree of the steam inlet adjusting valve is controlled to increase or decrease the output power of the small generator so as to assist the main steam turbine generator unit to perform the frequency modulation.
8. The method as claimed in claim 7, wherein the opening of the steam admission control valve is increased upon receiving an auxiliary frequency modulation command from the main steam turbine generator unit to increase the output power of the main steam turbine generator unit.
9. The method as claimed in claim 7, wherein the opening of the steam inlet adjusting valve is decreased when receiving an auxiliary frequency modulation command from the main steam turbine generator unit to decrease the output power of the main steam turbine generator unit.
10. A method for controlling a system for auxiliary frequency modulation in a thermal power plant as claimed in any one of claims 7 to 9, wherein said frequency modulation comprises primary frequency modulation and automatic power generation control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011632594.XA CN112803435A (en) | 2020-12-31 | 2020-12-31 | System and control method for auxiliary frequency modulation of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011632594.XA CN112803435A (en) | 2020-12-31 | 2020-12-31 | System and control method for auxiliary frequency modulation of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112803435A true CN112803435A (en) | 2021-05-14 |
Family
ID=75808459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011632594.XA Pending CN112803435A (en) | 2020-12-31 | 2020-12-31 | System and control method for auxiliary frequency modulation of thermal power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112803435A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206195360U (en) * | 2016-11-02 | 2017-05-24 | 西安交通大学 | A electric power storage primary control system for thermal power factory |
| CN206471833U (en) * | 2017-03-07 | 2017-09-05 | 中安创盈能源科技产业有限公司 | A kind of separate unit fired power generating unit electrochemical energy storage aids in frequency modulation device |
| CN209488186U (en) * | 2019-04-12 | 2019-10-11 | 西安热工研究院有限公司 | A kind of power plant AGC energy storage auxiliary frequency modulation system |
| CN110932292A (en) * | 2019-12-12 | 2020-03-27 | 上海外高桥第三发电有限责任公司 | Thermal power plant auxiliary frequency modulation device based on electric energy conversion device and energy storage device and control method |
| CN110932293A (en) * | 2019-12-12 | 2020-03-27 | 上海外高桥第三发电有限责任公司 | Auxiliary frequency modulation device of thermal power plant based on energy storage device and control method |
| CN111725845A (en) * | 2020-07-21 | 2020-09-29 | 西安热工研究院有限公司 | Auxiliary frequency modulation system based on variable load of power plant |
-
2020
- 2020-12-31 CN CN202011632594.XA patent/CN112803435A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206195360U (en) * | 2016-11-02 | 2017-05-24 | 西安交通大学 | A electric power storage primary control system for thermal power factory |
| CN206471833U (en) * | 2017-03-07 | 2017-09-05 | 中安创盈能源科技产业有限公司 | A kind of separate unit fired power generating unit electrochemical energy storage aids in frequency modulation device |
| CN209488186U (en) * | 2019-04-12 | 2019-10-11 | 西安热工研究院有限公司 | A kind of power plant AGC energy storage auxiliary frequency modulation system |
| CN110932292A (en) * | 2019-12-12 | 2020-03-27 | 上海外高桥第三发电有限责任公司 | Thermal power plant auxiliary frequency modulation device based on electric energy conversion device and energy storage device and control method |
| CN110932293A (en) * | 2019-12-12 | 2020-03-27 | 上海外高桥第三发电有限责任公司 | Auxiliary frequency modulation device of thermal power plant based on energy storage device and control method |
| CN111725845A (en) * | 2020-07-21 | 2020-09-29 | 西安热工研究院有限公司 | Auxiliary frequency modulation system based on variable load of power plant |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110932293B (en) | Auxiliary frequency modulation device of thermal power plant based on energy storage device and control method | |
| CN107516905B (en) | Multi-element coupling energy storage system | |
| EP4236001A1 (en) | Method and apparatus for controlling optical storage off-grid system, controller and storage medium | |
| CN111371104B (en) | Power grid frequency stability control method based on wind-storage combined power generation system | |
| CN103178533A (en) | Controlling method and controller for variable participation frequency of temperature control load | |
| CN103259059B (en) | A kind of flow battery initial charge method and circuit | |
| CN103595096A (en) | DC/DC conversion and control system used for standby power system of proton exchange membrane fuel cell | |
| CN106169752A (en) | Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern | |
| CN211266492U (en) | Auxiliary frequency modulation device of thermal power plant based on energy storage device | |
| CN203119501U (en) | Wind energy, solar energy and diesel engine integrated power supply system | |
| CN107546780B (en) | Power control algorithm of wind generating set | |
| CN211296204U (en) | Thermal power plant frequency modulation auxiliary device based on double electric energy converters | |
| CN110970926A (en) | Auxiliary frequency modulation device based on energy-saving technology for thermal power plant and control method thereof | |
| CN110932292A (en) | Thermal power plant auxiliary frequency modulation device based on electric energy conversion device and energy storage device and control method | |
| CN214798886U (en) | System for supplementary frequency modulation of thermal power plant | |
| CN112803435A (en) | System and control method for auxiliary frequency modulation of thermal power plant | |
| CN211266494U (en) | Auxiliary frequency modulation device based on energy-saving technology of thermal power plant | |
| CN211266491U (en) | Auxiliary frequency modulation device of thermal power plant based on electric energy conversion device and energy storage device | |
| EP4391295A1 (en) | Backup power supply and operating method therefor | |
| CN112787339A (en) | Auxiliary frequency modulation device of thermal power plant based on energy storage equipment and control method | |
| CN203813454U (en) | DC/DC conversion and control system for standby power system of proton exchange membrane fuel cell | |
| CN110943482A (en) | Thermal power plant frequency modulation auxiliary device based on double electric energy converters and control method | |
| CN114069672B (en) | Energy storage system control method and energy storage system | |
| CN210246326U (en) | Electrochemical frequency modulation power supply of thermal power plant and safety protection power supply system | |
| CN214412308U (en) | Auxiliary frequency modulation device of thermal power plant based on energy storage equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |