CN212183137U - Power plant energy storage black start system - Google Patents
Power plant energy storage black start system Download PDFInfo
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- CN212183137U CN212183137U CN202020783721.5U CN202020783721U CN212183137U CN 212183137 U CN212183137 U CN 212183137U CN 202020783721 U CN202020783721 U CN 202020783721U CN 212183137 U CN212183137 U CN 212183137U
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Abstract
The utility model discloses a black start-up system of power plant energy storage. The black start system comprises an energy storage system, an energy storage coordination controller and a synchronization device; the generator of the power plant is connected to the high-voltage substation of the power plant, and the high-voltage substation is connected to the service bus of the power plant through the service bus incoming switch; the energy storage system is used for accessing a service bus to realize black start; the energy storage coordination controller is respectively connected with the energy storage system and the synchronization device and used for adjusting the energy storage system, so that an industrial bus connected with the energy storage system tracks the voltage of the low-voltage side of the high-voltage substation and realizes synchronization, the energy storage coordination controller is also used for starting the synchronization device to perform synchronization detection, and when the voltage of the low-voltage side of the high-voltage substation and the voltage of the industrial bus meet synchronization conditions, the inlet wire switch of the industrial bus is closed, and synchronous closing is completed.
Description
Technical Field
The utility model belongs to the technical field of electrical engineering, in particular to black start-up system of power plant energy storage.
Background
The energy storage is an important component and a key supporting technology of smart power grids, energy internet, micro power grids and renewable energy grid connection. The stored energy may be used to assist in frequency modulation of the generator in power plant applications, and may also be used as a black start power supply to assist in black start of the generator set. 26/2/2020, GE U.S. at Pelliville, Louisiana, used a 7.4MW energy storage single cycle unit with a 150 megawatt 7F.03 heavy duty gas turbine to complete the world's first black start of the heavy duty gas turbine. When energy storage participates in black start in a power plant, a power supply source of a service bus needs to be switched back to a generator by the energy storage after the black start is completed, and if the system design is unreasonable, switching failure may occur, so that service power is lost, and black start failure is caused.
In view of this, a black start system for energy storage in a power plant is provided, which can realize that the power supply of the service bus is stably switched from the energy storage to the generator, reduce the impact during switching, and has important practical value and significance.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome the defect that above-mentioned prior art exists, provide a black start-up system of power plant energy storage, realize that the power plant passes through the energy storage and accomplishes black start-up.
In order to achieve the above object, according to one aspect of the present invention, there is provided a black start system for energy storage in a power plant, wherein the black start system comprises an energy storage system, an energy storage coordination controller, and a synchronization device; the generator of the power plant is connected to a high plant transformer of the power plant, and the high plant transformer is connected to a service bus of the power plant through a service bus incoming line switch;
the energy storage system is used for accessing the service bus to realize black start;
the energy storage coordination controller is respectively connected with the energy storage system and the synchronizing device and is used for adjusting the energy storage system, so that the factory bus connected with the energy storage system tracks the low-voltage side voltage of the high factory transformer and realizes synchronizing, the energy storage coordination controller is also used for starting the synchronizing device to perform synchronizing detection, and when the voltage of the low-voltage side of the high factory transformer and the voltage of the factory bus meet synchronizing conditions, the factory bus incoming line switch between the high factory transformer and the factory bus is closed to complete synchronous switching.
According to some embodiments, the black start system further comprises a voltage sampling device, and the voltage sampling device is respectively connected to two sides of the service bus incoming line switch, and is used for collecting voltages at two sides and transmitting the voltages to the energy storage coordination controller and the synchronization device.
According to some embodiments, the generator is connected to the high plant substation through a grid tie switch.
According to some embodiments, the generator is a gas generator or a coal generator.
According to some embodiments, the energy storage system is composed of at least one energy storage unit, and the energy storage unit comprises a battery, an energy storage converter, a transformer and an energy storage unit grid-connected switch.
According to some embodiments, the energy storage system is composed of 2 energy storage units, and each energy storage unit comprises 4 groups of batteries, 4 energy storage converters, 1 transformer and 1 energy storage unit grid-connected switch.
According to some embodiments, the energy storage converter operates in a voltage source mode of operation, employing droop control or virtual synchronous machine control strategies.
According to some embodiments, the energy storage coordination controller is connected to the energy storage system through an optical fiber or a network cable, and the energy storage coordination controller is configured to adjust a frequency, a voltage, and a phase of the energy storage system, so that the service bus connected to the energy storage system tracks a low-voltage side voltage of the high-voltage substation and achieves synchronization.
According to some embodiments, the energy storage coordination controller adjusts the frequency, voltage, and phase of the energy storage system by adjusting the energy storage converter.
According to some embodiments, the energy storage coordination controller is connected to the contemporaneous device by a cable.
According to some embodiments, the service bus incoming line switch is configured to be in an open state before the synchronization starts.
The utility model discloses following beneficial effect has:
1) the energy storage system is configured on the service bus of the power plant, and the service power is supplied by the energy storage system, so that black start of the generator and related auxiliary equipment in the power plant is realized. And after the black start is finished, the service bus is seamlessly returned to the generator again through synchronous control, and the generator terminal voltage supplies power.
2) And selecting the service bus incoming line switch as a synchronization point, and switching the power supply of the service bus back to the generator from the energy storage system. Compared with the synchronous operation at the generator end through a grid-connected switch, the load born by the stored energy in the black start process can be reduced, the design demand capacity of the energy storage system can be reduced, and the problem of poor operation control stability caused by large-scale impact loads such as high plant variation of the energy storage system can be solved.
3) The energy storage coordination controller and the synchronization device are configured in parallel, and double guarantees are provided for synchronization through different logics and means. The energy storage coordination controller actively adjusts the working point of each PCS in the energy storage system, controls the station bus voltage to track the voltage of the high-voltage station-to-low-voltage side, and actively and quickly completes synchronous adjustment. If only the synchronization device is used for passively waiting for capturing the synchronization point, the stable synchronization point may not be found for a long time even due to the low inertia of the energy storage system. And after the synchronization condition of the energy storage coordination controller is met, the synchronization device is started, synchronization judgment and outlet closing operation are completed through commonly used and approved relay protection equipment of the power system, and the operation specification of the power system is met.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is an embodiment of a power plant energy storage black start system of the present invention;
fig. 2 is an embodiment of an energy storage system in a power plant energy storage black start system according to the present invention;
in the figure: 1-a generator; 2-a grid-connected switch; 3-high factory change; 4-service bus incoming line switch; 5-service bus; 6-an energy storage system; 7-a voltage sampling device; 8-energy storage coordination controller; 9-a synchronizing device; PCS-energy storage converter; PMS-energy storage coordination controller.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the detailed description.
The utility model provides a black start-up system of power plant energy storage realizes that the power plant passes through energy storage system and accomplishes black start-up.
As shown in fig. 1, the power plant includes a generator 1, a grid-connected switch 2, a high-voltage substation 3, a service bus incoming line switch 4, a service bus 5, and the like, wherein the generator 1 is connected to the high-voltage substation 3, and the high-voltage substation 3 is connected to the service bus 5 through the service bus incoming line switch 4. In some embodiments, the generator 1 is a gas generator or a coal generator.
The black start system comprises an energy storage system 6, an energy storage coordination controller 8, a synchronization device 9 and the like.
The energy storage system 6 is connected to the service bus 5 of the power plant during black start. In some embodiments, the energy storage system 6 is comprised of at least one energy storage unit comprising: the system comprises a battery, an energy storage converter, a transformer and an energy storage unit grid-connected switch. Fig. 2 is an example of an energy storage system 6, which includes 2 units, each unit is composed of 4 groups of batteries, 4 energy storage converters, 1 transformer, and 1 energy storage unit grid-connected switch. The energy storage converter operates in a voltage source working mode, and a virtual synchronous machine control strategy is adopted.
The energy storage coordination controller 8 is respectively connected with the energy storage system 6 and the synchronization device 9. The energy storage coordination controller 8 can regulate the energy storage system 6, so that the service bus 5 connected with the energy storage system 6 can track the low-voltage side voltage of the high-voltage substation 3 and realize synchronization.
The synchronization device 9 can be started under the control of the energy storage coordination controller 8 to perform synchronization detection. When the synchronization device 9 detects that the voltage of the low-voltage side of the high-voltage substation 3 and the voltage of the service bus 5 meet synchronization conditions, the service bus incoming line switch 4 between the high-voltage substation 3 and the service bus 5 is closed, and synchronization switching-on is completed.
In some embodiments, the voltage sampling device 7 is used to collect the voltages at two sides of the service bus incoming line switch 4, and the collected voltages are used as the basis for the energy storage coordination controller 8 to adjust the energy storage system 6, and also used as the basis for the synchronization device 9 to judge whether the synchronization condition is met.
Specifically, the voltage sampling device 7 is respectively connected with the energy storage coordination controller 8 and the energy storage system 6, and the voltage sampling device 7 collects voltages on two sides of the service bus incoming line switch 4 and respectively transmits the voltages to the synchronization device 9 and the energy storage coordination controller 8. The energy storage coordination controller 8 and the energy storage system 6 can be connected through optical fibers. The energy storage coordination controller 8 issues an adjusting instruction to each energy storage converter of the energy storage system 6 through an optical fiber channel based on the low-voltage side voltage of the high-voltage substation 3 and the frequency, voltage and phase of the voltage on the service bus 5, which are obtained from the voltage sampling device 7, so as to adjust the frequency, voltage and phase of the service bus 5, so that the low-voltage side voltage of the high-voltage substation 3 is tracked, and finally the frequency, voltage and phase of the service bus 5 are synchronized with the low-voltage side of the high-voltage substation 3.
The energy storage coordination controller 8 and the synchronization device 9 may be hard-wired (e.g., cabled) via a node. After controlling the energy storage system 6 to perform synchronization tracking, the energy storage coordination controller 8 issues a start signal through the node, and starts the synchronization device 9 to start synchronization detection. The service bus incoming line switch 4 is in a breaking state before the same period begins. The synchronization device 9 judges whether the voltage of the low-voltage side of the high-voltage substation 3 and the voltage of the service bus 5 meet synchronization conditions or not according to the voltages of the two sides of the bus incoming line switch 4 collected by the voltage sampling device 7, and once the synchronization conditions are met, the service bus incoming line switch 4 is closed to complete synchronization switching.
The utility model discloses in, select the station service bus service incoming line switch as the synchronization point, realize that the power supply of station service bus switches back generator by the energy storage. Compared with the method that synchronization is carried out at the generator end through a grid-connected switch, the factory bus incoming line switch is selected as a synchronization point, the load born by the energy storage system in the black starting process can be reduced, the design demand capacity of the energy storage system is reduced, and the problem of poor operation control stability caused by large-scale impact loads such as high factory variation of the energy storage system can be solved.
In addition, the energy storage coordination controller and the synchronization device are configured at the same time, double guarantees can be provided for synchronization through different logics and means, and active and rapid synchronization adjustment is achieved.
The utility model also provides a control method of power plant energy storage black start system, include:
starting an energy storage system 6 and connecting the energy storage system with a service bus 5 of a power plant to realize black start;
the energy storage coordination controller 8 controls the energy storage system 6, so that the station bus 5 connected with the energy storage system 6 tracks the low-voltage side voltage of the high-voltage substation 3 of the power plant and realizes synchronization;
and the energy storage coordination controller 8 starts the synchronization device 9 to perform synchronization detection, and when the voltage on the low-voltage side of the high-voltage substation 3 and the voltage on the service bus 5 meet synchronization conditions, the service bus incoming line switch 4 between the high-voltage substation 3 and the service bus 5 is closed, and synchronization switching-on is completed.
In one embodiment, the voltages on two sides of the service bus incoming line switch 4 are collected, the energy storage coordination controller 8 controls the energy storage system 6 according to the collected voltages on the two sides, and the energy storage system 6 works in a voltage source mode.
In one embodiment, the synchronization device 9 detects voltages at two sides of the service bus incoming line switch 4 according to the collected voltage, and when it is detected that the voltage at the low-voltage side of the high-voltage service transformer 3 and the voltage on the service bus 5 meet the synchronization condition, the service bus incoming line switch 4 is closed, and synchronous closing is completed.
In one embodiment, the energy storage coordination controller 8 adjusts the frequency, voltage and phase of the energy storage system 6, so that the service bus 5 connected with the energy storage system 6 tracks the low-voltage side voltage of the high plant transformer 3 of the power plant and realizes synchronization.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Those of ordinary skill in the art will understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed broadly as set forth in the appended claims.
Claims (11)
1. The black start system for energy storage of the power plant is characterized by comprising an energy storage system, an energy storage coordination controller and a synchronization device; the generator of the power plant is connected to a high plant transformer of the power plant, and the high plant transformer is connected to a service bus of the power plant through a service bus incoming line switch;
the energy storage system is used for accessing the service bus to realize black start;
the energy storage coordination controller is respectively connected with the energy storage system and the synchronizing device and is used for adjusting the energy storage system, so that the factory bus connected with the energy storage system tracks the low-voltage side voltage of the high factory transformer and realizes synchronizing, the energy storage coordination controller is also used for starting the synchronizing device to perform synchronizing detection, and when the voltage of the low-voltage side of the high factory transformer and the voltage of the factory bus meet synchronizing conditions, the factory bus incoming line switch between the high factory transformer and the factory bus is closed to complete synchronous switching.
2. The power plant energy storage black start system of claim 1, wherein: the black start system further comprises a voltage sampling device, wherein the voltage sampling device is respectively connected with two sides of the service bus incoming line switch and used for collecting voltages on two sides and transmitting the voltages to the energy storage coordination controller and the synchronization device.
3. The power plant energy storage black start system of claim 1 or 2, wherein: and the generator is connected with the high-rise substation through a grid-connected switch.
4. The power plant energy storage black start system of claim 1, wherein: the generator is a gas generator or a coal generator.
5. The power plant energy storage black start system of claim 1, wherein: the energy storage system is composed of at least one energy storage unit, and the energy storage unit comprises a battery, an energy storage converter, a transformer and an energy storage unit grid-connected switch.
6. The power plant energy storage black start system of claim 5, wherein: the energy storage system is composed of 2 energy storage units, and each energy storage unit comprises 4 groups of batteries, 4 energy storage converters, 1 transformer and 1 energy storage unit grid-connected switch.
7. The power plant energy storage black start system of claim 5, wherein: the energy storage converter operates in a voltage source working mode and adopts a droop control or virtual synchronous machine control strategy.
8. The power plant energy storage black start system of claim 5, wherein: the energy storage coordination controller is connected with the energy storage system through an optical fiber or a network cable, and is used for adjusting the frequency, the voltage and the phase of the energy storage system, so that the service bus connected with the energy storage system tracks the voltage of the low-voltage side of the high-voltage substation and realizes synchronization.
9. The power plant energy storage black start system of claim 8, wherein: and the energy storage coordination controller adjusts the frequency, the voltage and the phase of the energy storage system by adjusting the energy storage converter.
10. The power plant energy storage black start system of claim 1, wherein: the energy storage coordination controller is connected with the synchronous device through a cable.
11. The power plant energy storage black start system of claim 1, wherein: the service bus incoming line switch is configured to be in an open state before the synchronization starts.
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| CN202020783721.5U CN212183137U (en) | 2020-05-12 | 2020-05-12 | Power plant energy storage black start system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922495A (en) * | 2021-10-13 | 2022-01-11 | 阳光电源(南京)有限公司 | Energy storage power station and black start method |
| CN114629144A (en) * | 2022-05-16 | 2022-06-14 | 国网浙江省电力有限公司电力科学研究院 | Energy storage power station black start method and system based on virtual synchronous machine |
| CN116073435A (en) * | 2023-03-30 | 2023-05-05 | 西安热工研究院有限公司 | Black start system and method for diesel-engine combined combustion engine |
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2020
- 2020-05-12 CN CN202020783721.5U patent/CN212183137U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922495A (en) * | 2021-10-13 | 2022-01-11 | 阳光电源(南京)有限公司 | Energy storage power station and black start method |
| CN114629144A (en) * | 2022-05-16 | 2022-06-14 | 国网浙江省电力有限公司电力科学研究院 | Energy storage power station black start method and system based on virtual synchronous machine |
| CN114629144B (en) * | 2022-05-16 | 2022-09-02 | 国网浙江省电力有限公司电力科学研究院 | Energy storage power station black start method and system based on virtual synchronous machine |
| CN116073435A (en) * | 2023-03-30 | 2023-05-05 | 西安热工研究院有限公司 | Black start system and method for diesel-engine combined combustion engine |
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Effective date of registration: 20220623 Address after: 211102, No. 69, Su Yuan Avenue, Jiangning District, Jiangsu, Nanjing Patentee after: NR ELECTRIC Co.,Ltd. Patentee after: NR ENGINEERING Co.,Ltd. Patentee after: NR ELECTRIC POWER ELECTRONICS Co.,Ltd. Address before: 211102, No. 69, Su Yuan Avenue, Jiangning District, Jiangsu, Nanjing Patentee before: NR ELECTRIC Co.,Ltd. Patentee before: Nanjing Nan relic Engineering Technology Co., Ltd. |
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