CN111725845A - Auxiliary frequency modulation system based on variable load of power plant - Google Patents
Auxiliary frequency modulation system based on variable load of power plant Download PDFInfo
- Publication number
- CN111725845A CN111725845A CN202010707253.8A CN202010707253A CN111725845A CN 111725845 A CN111725845 A CN 111725845A CN 202010707253 A CN202010707253 A CN 202010707253A CN 111725845 A CN111725845 A CN 111725845A
- Authority
- CN
- China
- Prior art keywords
- power
- load
- generator
- control system
- agc
- 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
- H02J3/38—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
-
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
-
- 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
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses an auxiliary frequency modulation system based on variable load of a power plant, which comprises a 220kV high-voltage bus, a main transformer, a distributed control system DCS, a remote terminal unit RTU, a power measuring device, a generator, a high-voltage station transformer, a 6kV station bus, a load transformer and a variable load system, wherein a coal-fired generator is connected with the main transformer and the high-voltage station transformer through the power measuring device, the main transformer is connected with the 220kV high-voltage bus through a first switch, the high-voltage station transformer is connected with the 6kV station bus through a second switch, the 6kV station bus is connected with the high-voltage side of the load transformer through a third switch, and the low-voltage side of the load transformer is connected with a large-capacity load through a power control device; the DCS is in communication connection with the power control device to participate in unit AGC, so that the response speed of a power plant to AGC commands is effectively increased, the frequency modulation of the unit is assisted, the requirement of power grid evaluation indexes is met, and the economic benefit of a power generation enterprise is increased.
Description
Technical Field
The invention belongs to the field of frequency modulation of power plant units, and particularly relates to an auxiliary frequency modulation system based on variable load of a power plant.
Background
When a thermal power plant participates in primary frequency modulation of a power grid, due to factors such as unstable power supply coal quality and low accuracy of an online wind-powder measuring system, when the power plant rapidly lifts loads, various parameters of the unit are difficult to accurately control, and the response speed and accuracy of load change of the unit are greatly reduced. At present, the high-pressure throttle regulating technology and a multivariable collaborative optimization system are generally adopted to improve the regulating capacity of a unit, but the actual load change curve of the unit is still different from the load change curve required by the primary frequency modulation assessment of a power grid, so that other methods are needed to further improve the response speed of load change.
The large-capacity variable load system controls the power of a large-capacity load in real time through the power control device, and has the advantages of high response speed, accurate control and the like. Some factory electrical systems of thermal power plants have access to large-capacity variable loads, such as an electric boiler system and the like, but the power control systems of the thermal power plants and the power plant DCS do not establish communication and cannot participate in unit AGC.
Disclosure of Invention
The invention aims to provide an auxiliary frequency modulation system based on variable load of a power plant aiming at the problems that the existing large-capacity variable load can not participate in AGC of a unit and can not help the unit to improve the frequency modulation performance.
The invention is realized by adopting the following technical scheme:
an auxiliary frequency modulation system based on variable load of a power plant comprises a 220kV high-voltage bus, a main transformer, a Distributed Control System (DCS), a Remote Terminal Unit (RTU), a power measuring device, a generator, a high-voltage station transformer, a 6kV station bus, a load transformer and a variable load system; wherein the content of the first and second substances,
the coal-fired generator is connected with a main transformer and a high-voltage station transformer through a power measuring device, the main transformer is connected with a 220kV high-voltage bus through a first switch, the high-voltage station transformer is connected with a 6kV station bus through a second switch, the 6kV station bus is connected with the high-voltage side of a load transformer through a third switch, and the low-voltage side of the load transformer is connected with a variable load system.
A further improvement of the invention is that the variable load system comprises a power control means and a high capacity load, the high capacity load being connected to the load transformer via the power control means.
A further improvement of the invention is that the power control means is capable of adjusting the output power in accordance with the command.
The invention has the further improvement that the distributed control system DCS and the power measuring device establish communication connection, and the power measuring device transmits a power signal of the generator to the distributed control system DCS; the distributed control system DCS establishes communication connection with the generator and sends a power instruction to the generator; the distributed control system DCS establishes bidirectional communication connection with the power control device, the power control device transmits a large-capacity load power signal to the distributed control system DCS, and the distributed control system DCS transmits the power of a generator to the power control device; the distributed control system DCS and the remote terminal unit RTU establish two-way communication connection, the distributed control system DCS transmits a total power signal of the unit to the remote terminal unit RTU, the total power signal of the unit is the difference between the power of a generator and the large-capacity load power, and the remote terminal unit RTU transmits the total power signal of the unit to a dispatching center; and the dispatching center transmits AGC commands to the distributed control system DCS and the power control device through the remote terminal unit RTU.
The invention has the further improvement that the unit normally operates, when the variable load normally operates, the variable load system is accessed into a factory power system of the unit and participates in AGC frequency modulation of the unit, and the first switch, the second switch and the third switch are in on-position; the unit and the large-capacity load participate in unit AGC, a dispatching center sends AGC instructions to a Distributed Control System (DCS) and a power control device through a Remote Terminal Unit (RTU), if the AGC instructions are load increasing instructions, the Distributed Control System (DCS) sends the load increasing instructions to a generator, and the power control device rapidly reduces the large-capacity load power, so that the difference between the power increasing of the generator and the power reducing of the large-capacity load is always consistent with the AGC load increasing instructions; if the AGC instruction is a load reduction instruction, the distributed control system DCS sends the load reduction instruction to the generator, and the power control device rapidly increases the large-capacity load power, so that the difference between the power reduction of the generator and the power increase of the large-capacity load is always consistent with the AGC load reduction instruction; wherein increasing power is positive and decreasing power is negative.
The invention has the further improvement that when the unit normally operates and the large-capacity load stops operating, the large-capacity load is disconnected with the auxiliary power system and does not participate in the AGC of the unit, the first switch and the second switch are in a closed position, and the third switch is in a separated position; the unit participates in AGC frequency modulation, the dispatching center sends an AGC instruction to the distributed control system DCS through the remote terminal unit RTU, and the distributed control system DCS sends a load increasing and decreasing instruction to the generator, so that the load increasing and decreasing of the generator are always consistent with the AGC load increasing and decreasing instruction.
The invention has at least the following beneficial technical effects:
the industrial power large load system of the existing system does not establish communication with a remote terminal unit RTU and a unit distributed control system DCS, cannot participate in unit AGC, and cannot assist a generator to participate in frequency modulation. According to the auxiliary frequency modulation system based on the variable load of the power plant, the power control device is arranged on the large-capacity load, the power control device establishes communication with the remote terminal unit RTU and the distributed control system DCS, and the large-capacity load power is controlled to jointly participate in AGC, so that the response speed of the power plant to AGC commands is effectively increased, the frequency modulation of the unit is assisted, the requirement of power grid evaluation indexes is met, and the economic benefit of power generation enterprises is increased.
Drawings
FIG. 1 is a schematic diagram of a variable load secondary frequency modulation system for a power plant.
Fig. 2 is a schematic diagram of a variable load secondary frequency modulation operation of a power plant.
FIG. 3 is a schematic diagram of a variable load shutdown operation of a power plant.
Description of reference numerals:
the system comprises 1-220kV high-voltage bus, 2-main transformer, 3-distributed control system DCS, 4-remote terminal unit RTU, 5-power measuring device, 6-generator, 7-high-voltage station transformer, 8-6kV station bus, 9-load transformer, 10-power control device and 11-large-capacity load.
101-a first switch, 201-a second switch, 202-a third switch.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the auxiliary frequency modulation system based on variable load of power plant provided by the present invention comprises a 220kV high voltage bus 1, a main transformer 2, a distributed control system DCS3, a remote terminal unit RTU4, a power measurement device 5, a generator 6, a high voltage service transformer 7, a 6kV service bus 8, a load transformer 9, a power control device 10, and a large capacity load 11; wherein the coal-fired generator 6 is connected with a main transformer 2 and a high-voltage station transformer 7 through a power measuring device 5, the main transformer 2 is connected with a 220kV high-voltage bus 1 through a first switch 101, the high-voltage station transformer 7 is connected with a 6kV station bus 8 through a second switch 201, the 6kV station bus 8 is connected with the high-voltage side of a load transformer 9 through a third switch 202, and the low-voltage side of the load transformer 9 is connected with a high-capacity load 11 through a power control device 10.
The working principle of the invention is as follows:
the distributed control system DCS3 and the power measuring device 5 establish communication connection, and the power measuring device 5 transmits a power signal of the generator to the distributed control system DCS 3; the distributed control system DCS3 establishes communication connection with the generator 6, and the distributed control system DCS3 sends a power instruction to the generator; the distributed control system DCS3 establishes bidirectional communication connection with the power control device 10, the power control device 10 transmits a large-capacity load power signal to the distributed control system DCS3, and the distributed control system DCS3 transmits generator power to the power control device 10; the distributed control system DCS3 and the remote terminal unit RTU4 establish bidirectional communication connection, the distributed control system DCS3 transmits a total power signal of the unit to the remote terminal unit RTU4, the total power signal of the unit is the difference between the power of the generator and the power of a large-capacity load, and the remote terminal unit RTU4 transmits the total power signal of the unit to a dispatching center; the dispatch center transmits an AGC command to the distributed control system DCS3 and the power control apparatus 10 via the remote terminal unit RTU 4.
As shown in fig. 2, when the unit normally operates, and the variable load system normally operates, the variable load system accesses the plant power system and participates in AGC frequency modulation of the unit, and the first switch 101, the second switch 201 and the third switch 202 are in a closed position; the unit and the large-capacity load participate in AGC of the unit, a dispatching center sends an AGC command to a distributed control system DCS3 and a power control device 10 through a remote terminal unit RTU4, if the AGC command is a load increasing command, the distributed control system DCS3 sends a load increasing command to a generator 6, and the power control device rapidly reduces the large-capacity load power, so that the difference between the power increasing of the generator and the power reducing of the large-capacity load (the power increasing is a positive value, and the power reducing is a negative value) is always kept consistent with the AGC load increasing command; if the AGC instruction is a load reduction instruction, the distributed control system DCS3 sends the load reduction instruction to the generator 6, and the power control device rapidly increases the large-capacity load power, so that the difference between the power reduction of the generator and the power increase of the large-capacity load (the power increase is a positive value, and the power decrease is a negative value) is always consistent with the AGC load reduction instruction;
as shown in fig. 3, when the unit normally operates, and the large-capacity load stops operating, the large-capacity load is disconnected from the service power system and does not participate in AGC of the unit, the first switch 101 and the second switch 201 are in a closed position, and the third switch 202 is in an open position; the unit participates in AGC frequency modulation, the dispatching center sends an AGC command to a distributed control system DCS3 through a remote terminal unit RTU4, and the distributed control system DCS3 sends a load increase and decrease command to the generator 6, so that the load increase and decrease of the generator are always kept with the AGC increase and decrease.
Claims (6)
1. An auxiliary frequency modulation system based on variable load of a power plant is characterized by comprising a 220kV high-voltage bus (1), a main transformer (2), a distributed control system DCS (3), a remote terminal unit RTU (4), a power measuring device (5), a generator (6), a high-voltage station transformer (7), a 6kV station bus (8), a load transformer (9) and a variable load system; wherein the content of the first and second substances,
the coal-fired generator (6) is connected with a main transformer (2) and a high-voltage station transformer (7) through a power measuring device (5), the main transformer (2) is connected with a 220kV high-voltage bus (1) through a first switch (101), the high-voltage station transformer (7) is connected with a 6kV station power bus (8) through a second switch (201), the 6kV station power bus (8) is connected with the high-voltage side of a load transformer (9) through a third switch (202), and the low-voltage side of the load transformer (9) is connected with a variable load system.
2. A power plant variable load based secondary fm system according to claim 1, wherein the variable load system comprises a power control device (10) and a bulk load (11), the bulk load (11) being connected to the load transformer (9) via the power control device (10).
3. A power plant variable load based secondary fm system according to claim 2, wherein the power control means (10) is operable to adjust the output power in response to a command.
4. A power plant variable load based auxiliary frequency modulation system according to claim 2, characterized in that the distributed control system DCS (3) is communicatively connected to the power measuring device (5), and the power measuring device (5) transmits the generator power signal to the distributed control system DCS (3); the distributed control system DCS (3) is in communication connection with the generator (6), and the distributed control system DCS (3) sends a power instruction to the generator; the distributed control system DCS (3) is in bidirectional communication connection with the power control device (10), the power control device (10) transmits a large-capacity load power signal to the distributed control system DCS (3), and the distributed control system DCS (3) transmits power of a generator to the power control device (10); the distributed control system DCS (3) and the remote terminal unit RTU (4) establish bidirectional communication connection, the distributed control system DCS (3) transmits a total power signal of a unit to the remote terminal unit RTU (4), the total power signal of the unit is the difference between the power of a generator and the power of a large-capacity load, and the remote terminal unit RTU (4) transmits the total power signal of the unit to a dispatching center; the dispatching center transmits AGC commands to a distributed control system DCS (3) and a power control device (10) through a remote terminal unit RTU (4).
5. The auxiliary frequency modulation system based on the variable load of the power plant as claimed in claim 2, wherein the unit is in normal operation, when the variable load is in normal operation, the variable load system is connected to the plant power system of the unit and participates in AGC frequency modulation of the unit, and the first switch (101), the second switch (201) and the third switch (202) are in closed position; the unit and the large-capacity load participate in AGC of the unit, a dispatching center sends an AGC instruction to a distributed control system DCS (3) and a power control device (10) through a remote terminal unit RTU (4), if the AGC instruction is a load increasing instruction, the distributed control system DCS (3) sends a load increasing instruction to a generator (6), and the power control device rapidly reduces the large-capacity load power, so that the difference between the power increasing of the generator and the power reducing of the large-capacity load is always kept consistent with the AGC load increasing instruction; if the AGC instruction is a load reduction instruction, the distributed control system DCS (3) sends the load reduction instruction to the generator (6), and the power control device rapidly increases the high-capacity load power, so that the difference between the power reduction of the generator and the power increase of the high-capacity load is always consistent with the AGC load reduction instruction; wherein increasing power is positive and decreasing power is negative.
6. The auxiliary frequency modulation system based on the variable load of the power plant as claimed in claim 1 or 2, wherein the unit is normally operated, when the large-capacity load is stopped, the large-capacity load is disconnected from the service system and does not participate in the unit AGC, the first switch (101) and the second switch (201) are in a closed position, and the third switch (203) is in a separated position; the unit participates in AGC frequency modulation, the dispatching center sends an AGC instruction to the distributed control system DCS (3) through the remote terminal unit RTU (4), and the distributed control system DCS (3) sends a load increasing and decreasing instruction to the generator (6), so that the load increasing and decreasing of the generator are always consistent with the AGC load increasing and decreasing instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010707253.8A CN111725845A (en) | 2020-07-21 | 2020-07-21 | Auxiliary frequency modulation system based on variable load of power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010707253.8A CN111725845A (en) | 2020-07-21 | 2020-07-21 | Auxiliary frequency modulation system based on variable load of power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111725845A true CN111725845A (en) | 2020-09-29 |
Family
ID=72573046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010707253.8A Pending CN111725845A (en) | 2020-07-21 | 2020-07-21 | Auxiliary frequency modulation system based on variable load of power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111725845A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803435A (en) * | 2020-12-31 | 2021-05-14 | 上海外高桥第三发电有限责任公司 | System and control method for auxiliary frequency modulation of thermal power plant |
| CN114151207A (en) * | 2021-11-03 | 2022-03-08 | 中山嘉明电力有限公司 | Quick load-changing control method for gas turbine unit |
| CN115133582A (en) * | 2022-06-16 | 2022-09-30 | 吉林省电力科学研究院有限公司 | AGC frequency modulation control method for auxiliary thermal power generating unit of electrode type electric boiler |
| WO2023071266A1 (en) * | 2021-10-26 | 2023-05-04 | 西安热工研究院有限公司 | Coordination control system for agc frequency modulation of energy storage participation unit of power plant |
-
2020
- 2020-07-21 CN CN202010707253.8A patent/CN111725845A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803435A (en) * | 2020-12-31 | 2021-05-14 | 上海外高桥第三发电有限责任公司 | System and control method for auxiliary frequency modulation of thermal power plant |
| WO2023071266A1 (en) * | 2021-10-26 | 2023-05-04 | 西安热工研究院有限公司 | Coordination control system for agc frequency modulation of energy storage participation unit of power plant |
| CN114151207A (en) * | 2021-11-03 | 2022-03-08 | 中山嘉明电力有限公司 | Quick load-changing control method for gas turbine unit |
| CN114151207B (en) * | 2021-11-03 | 2023-12-22 | 中山嘉明电力有限公司 | Rapid load-changing control method for gas turbine unit |
| CN115133582A (en) * | 2022-06-16 | 2022-09-30 | 吉林省电力科学研究院有限公司 | AGC frequency modulation control method for auxiliary thermal power generating unit of electrode type electric boiler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111725845A (en) | Auxiliary frequency modulation system based on variable load of power plant | |
| CN212412777U (en) | Auxiliary frequency modulation system based on variable load of power plant | |
| CN102064562B (en) | Active power optimization method for combined transmission of wind power and thermal power | |
| WO2023071266A1 (en) | Coordination control system for agc frequency modulation of energy storage participation unit of power plant | |
| CN101414752A (en) | Closed-cycle control system for reactive automatic optimization of network-configuring voltage | |
| CN102315813B (en) | Intelligent control system of economic operation of transformer | |
| CN103178764A (en) | Method and system for adjusting on-load tapping switch of flexible direct-current transmission connected transformer | |
| CN102738807B (en) | All-station reactive optimal control method for intensively integrating wind farms into public transformer substation | |
| CN113964851A (en) | Intelligent control system for energy storage participation in primary frequency modulation of thermal power generating unit | |
| CN113300415A (en) | Auxiliary frequency modulation system based on power plant new energy power generation technology | |
| CN104701856A (en) | Method of controlling reactive voltage at grid connection point of wind power plant | |
| CN103475002A (en) | Voltage stability control method based on AVC (Automatic Voltage Control) | |
| CN116382200A (en) | Full-load self-stabilization system of unit and operation method thereof | |
| CN204663593U (en) | The filling control system of Power Plant Feedwater mercury vapour turbine | |
| CN203251095U (en) | A negative sequence compensation system in electrified railways | |
| CN215733513U (en) | Auxiliary frequency modulation system based on power plant new energy power generation technology | |
| CN211316135U (en) | Automatic power generation control system of circulating fluidized bed unit | |
| CN215817557U (en) | Primary frequency modulation system of thermal power generating unit based on new energy power generation equipment | |
| CN203967766U (en) | Cogeneration power plant's level of factory load based on level of factory information monitoring system is optimized distributor | |
| CN113489050A (en) | Induction type voltage regulation soft take-off and landing control system and method for photovoltaic power station | |
| CN202103431U (en) | MCR (Magnetically Controlled Reactor)-type static var compensator (SVC) | |
| CN206992707U (en) | Power plant AGC frequency modulation systems | |
| CN108075477B (en) | Electric power system voltage regulating method based on electric heat storage device | |
| CN113300419A (en) | Primary frequency modulation system of thermal power generating unit based on new energy power generation equipment | |
| Xuedong et al. | The research and application of stability control system operated on qipanjing industrial park isolated power system |
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 |