CN114094635B - Black-start system and method for small hydropower micro-grid - Google Patents
Black-start system and method for small hydropower micro-grid Download PDFInfo
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- CN114094635B CN114094635B CN202111364986.7A CN202111364986A CN114094635B CN 114094635 B CN114094635 B CN 114094635B CN 202111364986 A CN202111364986 A CN 202111364986A CN 114094635 B CN114094635 B CN 114094635B
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- 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
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- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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- 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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention relates to the technical field of micro-grid application, and discloses a black start system and method of a small hydropower micro-grid. The system comprises a main line with a plurality of loads at the tail end, a power grid branch line, an energy storage switch station, an important load distribution room branch line and an energy storage management system, wherein the tail end of the main line is connected with a bus A, the power grid branch line is connected with a bus B, each branch line in the energy storage switch station is connected with a corresponding bus in a 3/2 wiring mode, and the energy storage management system controls the on-off of a corresponding switch of each branch line in the energy storage switch station; the invention also correspondingly provides a black start method based on the system, the method automatically switches the load according to the small water power output and load condition, and the power supply is gradually recovered by adopting a water power-load small capacity alternate start mode, so that the excessive line charging current and transformer excitation surge current can be prevented, the impact on a black start main power supply is effectively reduced, and the method can be suitable for micro-grids containing multiple water power, energy storage and multiple loads.
Description
Technical Field
The invention relates to the technical field of micro-grid application, in particular to a black start system and method of a small hydropower micro-grid.
Background
And the black start refers to a process of recovering power supply to the load by utilizing a power supply with self-starting capability in the area to drive the load in the area to enter island operation after the power system fails and stops running. In order that the micro-grid can stably operate and continuously supply power to important loads when the power system fails and stops, it is necessary to formulate a black start control strategy of the micro-grid.
The prior patent (patent application number is CN 201410397837.4) provides a regional little hydropower and new energy complementary micro-grid participation power grid black start method, the research object of the patent is a micro-grid system comprising 1 little hydropower, 1 photovoltaic, 1 energy storage, 1 fan and 1 load, and the method completes the start of the micro-grid by adopting a mode of starting the energy storage, the little hydropower, the photovoltaic, the fan and the load in sequence. The system structure of the research object is ideal, and the situation that multiple loads, multiple hydropower stations, multiple energy storage and multiple branch lines exist in one area in an actual power grid is often caused, the power generation capacity of each hydropower station is divided, the loads are different in importance degree, and the capacities of the loads are different. If the input is carried out indiscriminately, the charging current of the circuit and the excitation surge current of the transformer are too large, so that the impact on the black start main power supply is increased, and further the black start failure and the important load power failure are caused.
Disclosure of Invention
The invention provides a black start system and a method for a small hydropower micro-grid, which solve the technical problems that the existing black start control strategy cannot be suitable for micro-grids containing multiple hydropower, energy storage and multiple loads and has larger impact on a black start main power supply.
The invention provides a black start system of a small hydropower micro-grid, which comprises a main line, a power grid branch line, an energy storage switch station, an important load distribution room branch line and an energy storage management system, wherein the tail end of the main line is provided with a plurality of loads, the energy storage switch station comprises a bus A, a bus B, a standby interval branch line, a first small hydropower branch line, a second small hydropower branch line, a third small hydropower branch line, a fourth small hydropower branch line, a first energy storage system branch line and a second energy storage system branch line;
the tail end of the main line is connected with the bus A, the branch line of the power grid is connected with the bus B, the branch line of the first energy storage system is connected with the bus A, the branch line of the second energy storage system is connected with the bus B, the branch line of the important load distribution room and the branch line of the first small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode, the branch line of the second small hydropower station and the branch line of the third small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode, and the branch line of the standby interval and the branch line of the fourth small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode;
the energy storage management system is used for controlling the on-off of the corresponding switch of each branch line in the energy storage switch station.
According to one implementation manner of the first aspect of the present invention, when each branch line in the energy storage switchyard is connected to a corresponding bus, the connected switches are all circuit breakers.
According to one realisable form of the first aspect of the invention, the load-bearing electrical distribution room leg is adjacent the busbar a and the first small hydropower leg is adjacent the busbar B.
According to one realisable form of the first aspect of the invention, the alternate spacing leg is adjacent the busbar a and the fourth small hydropower leg is adjacent the busbar B.
The second aspect of the invention provides a black start method of a small hydropower micro-grid, the method is based on the black start system of the small hydropower micro-grid in any mode, and the method comprises the following steps:
s1, controlling all switches in each branch line, a main line and an important load distribution room branch line in an energy storage switch station to be disconnected;
s2, controlling three switches in a 3/2 wiring mode of the standby interval branch line and the fourth small hydropower branch line to be closed so that the bus A and the bus B operate in parallel;
s3, controlling switches in a first energy storage system branch line and a second energy storage system branch line to be closed, so that a transformer in the first energy storage system branch line is connected to the bus A, and a transformer in the second energy storage system branch line is connected to the bus B;
s4, starting a first energy storage system corresponding to the first energy storage system branch line, and starting a second energy storage system corresponding to the second energy storage system branch line after a first preset time is spaced;
s5, performing circulation control operation;
wherein the loop control operation includes:
s51, judging whether a first condition is met according to the current energy storage charging power of the system, wherein the first condition is that the current energy storage charging power is smaller than a first power threshold value and a small hydropower branch line is not put in; if yes, go to step S52; if not, executing step S53;
s52, throwing a small hydropower station branch line from the small hydropower station branch line which is not thrown into according to the sequence from the large hydropower station capacity to the small hydropower station branch line, and executing the step S53 after a second preset time interval;
s53, judging whether a second condition is met according to the current energy storage and discharge power of the system, wherein the second condition is that the current energy storage and discharge power is smaller than a second power threshold value and no load branch line is put in; if yes, go to step S54; if not, and the previous step is step S51, ending the cycle control operation; if not, and the previous step is step S52, step S51 is executed;
s54, selecting one load branch which is not put into the process according to the order of the importance degree of the load from the large to the small, and executing the step S51 after a third preset time is spaced.
According to one implementation manner of the second aspect of the present invention, in step S4, the first energy storage system and the second energy storage system are started in a VF droop control mode.
According to one manner of realising the second aspect of the invention, the importance of the load in the branch of the load distribution room is greater than the importance of the load in the main line.
According to one mode of the second aspect of the present invention, the small hydropower stations are arranged in order of large hydropower capacity, and the first small hydropower station, the second small hydropower station, the third small hydropower station, and the fourth small hydropower station are arranged in this order.
According to one manner of implementation of the second aspect of the present invention, the first power threshold is 20% of the maximum stored charging power of the system; the second power threshold is 20% of the maximum energy storage discharge power of the system.
According to one possible implementation of the second aspect of the present invention, the first preset time is 1 minute.
From the above technical scheme, the invention has the following advantages:
the system comprises a main line with a plurality of loads at the tail end, a power grid branch line, an energy storage switch station, an important load distribution room branch line and an energy storage management system, wherein the tail end of the main line is connected with a bus A, the power grid branch line is connected with a bus B, each branch line in the energy storage switch station is connected with a corresponding bus in a 3/2 wiring mode, and the energy storage management system controls the on-off of a corresponding switch of each branch line in the energy storage switch station; the invention also correspondingly provides a black start method based on the system, the method automatically switches the load according to the small water power output and load condition, and the power supply is gradually recovered by adopting a water power-load small capacity alternate start mode, so that the excessive line charging current and transformer excitation surge current can be prevented, the impact on a black start main power supply is effectively reduced, and the method can be suitable for micro-grids containing multiple water power, energy storage and multiple loads.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of a black start system of a small hydropower micro-grid according to an alternative embodiment of the present invention;
fig. 2 is a flowchart of a black start method of a small hydropower micro-grid according to an alternative embodiment of the invention.
Description of the drawings:
39T 1-first circuit breaker; 58T 1-second circuit breaker; 601-a third circuit breaker; 602-fourth circuit breaker; 603-fifth circuit breaker; 604-a sixth circuit breaker; 605-seventh circuit breaker; 606-eighth circuit breaker; 607-ninth circuit breaker; 608-tenth circuit breaker; 611-eleventh circuit breaker; 612-twelfth circuit breaker; 613-thirteenth circuit breaker; 621-fourteenth circuit breaker; 622-fifteenth circuit breaker; 623-sixteenth circuit breaker; 631-seventeenth circuit breaker; 632-eighteenth circuit breaker; 633-nineteenth circuit breaker; 802-twentieth circuit breaker; 803-twenty-first circuit breaker; x601-twenty-second circuit breaker; x602-twenty-third circuit breaker; x603-twenty-fourth circuit breaker; x801-twenty-fifth circuit breaker; x802-twenty-sixth circuit breaker; x803-twenty-seventh circuit breaker.
Detailed Description
The embodiment of the invention provides a black start system and a method for a small hydropower micro-grid, which are used for solving the technical problems that the existing black start control strategy cannot be suitable for micro-grids containing multiple hydropower, energy storage and multiple loads and has large impact on a black start main power supply.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Where noted, the terms "first," "second," and the like in the following embodiments of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, fig. 1 shows a schematic wiring diagram of a black start system of a small hydropower micro-grid according to an embodiment of the invention.
The invention provides a black start system of a small hydropower micro-grid, which comprises a main line, a power grid branch line, an energy storage switch station, an important load distribution room branch line and an energy storage management system, wherein the tail end of the main line is provided with a plurality of loads, the energy storage switch station comprises a bus A, a bus B, a standby interval branch line, a first small hydropower branch line, a second small hydropower branch line, a third small hydropower branch line, a fourth small hydropower branch line, a first energy storage system branch line and a second energy storage system branch line;
the tail end of the main line is connected with the bus A, the branch line of the power grid is connected with the bus B, the branch line of the first energy storage system is connected with the bus A, the branch line of the second energy storage system is connected with the bus B, the branch line of the important load distribution room and the branch line of the first small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode, the branch line of the second small hydropower station and the branch line of the third small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode, and the branch line of the standby interval and the branch line of the fourth small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode;
the energy storage management system is used for controlling the on-off of the corresponding switch of each branch line in the energy storage switch station.
And a switch is connected between each branch line and the corresponding bus in the energy storage switch station. The switch can be controlled by an energy storage management system. In one possible implementation, when each branch line in the energy storage switchyard is connected to a corresponding bus, the connected switches are all circuit breakers.
As shown in fig. 1, the main circuit includes a first load and a second load, wherein the first load is connected to a first breaker 39T1 on the left side, a second breaker 58T1 is connected between the first load and the second load, and a third breaker 601 is provided between the right end of the second load and the connected bus a.
A fourth breaker 602 is arranged at the standby interval branch line, and a fifth breaker 603 is arranged at the fourth small hydropower branch line; a sixth breaker 604 is arranged on the right side of a third load at a branch line of the important load distribution room, a seventh breaker 605 is arranged at a first small hydropower branch line, an eighth breaker 606 is arranged at a third small hydropower branch line, a ninth breaker 607 is arranged at a second small hydropower branch line, and a tenth breaker 608 is arranged at a power grid branch line;
the three switches in the 3/2 wiring mode of the standby interval branch line and the fourth small hydropower branch line are an eleventh circuit breaker 611, a twelfth circuit breaker 612 and a thirteenth circuit breaker 613 in this order. The three switches in the 3/2 connection mode of the important load distribution room branch line and the first small hydropower branch line are a fourteenth circuit breaker 621, a fifteenth circuit breaker 622 and a sixteenth circuit breaker 623 in order. The three switches in the 3/2 wiring mode of the third small hydropower branch line and the second small hydropower branch line are a seventeenth circuit breaker 631, an eighteenth circuit breaker 632 and a nineteenth circuit breaker 633 in sequence; a twenty-first circuit breaker 802 is disposed between the first energy storage system leg and bus a, and a twenty-first circuit breaker 803 is disposed between the second energy storage system leg and bus B.
The important load distribution room branch line is further provided with a fourth load, a fifth load, a sixth load and a seventh load, and is correspondingly provided with a twenty-second circuit breaker X601, a twenty-third circuit breaker X602, a twenty-fourth circuit breaker X603, a twenty-fifth circuit breaker X801, a twenty-sixth circuit breaker X802 and a twenty-seventh circuit breaker X803.
According to the embodiment of the invention, the main line of the important load distribution room and the first small hydropower station main line are connected into the bus A and the bus B in a 3/2 wiring mode, so that the first small hydropower station main line is favorable for guaranteeing power supply preferentially in an off-grid state, and the power supply reliability of important users is obviously improved.
Further, the important load distribution room branch line is close to the bus A, the first small hydropower branch line is close to the bus B, the standby interval branch line is close to the bus A, and the fourth small hydropower branch line is close to the bus B, so that the small hydropower branch line can be put into more flexibly.
The invention also provides a black start method of the small hydropower micro-grid, which is based on the black start system of the small hydropower micro-grid according to any one of the embodiments.
As shown in fig. 2, the method comprises the steps of:
s1, controlling all switches in each branch line, the main line and the branch line of the important load distribution room in the energy storage switch station to be disconnected.
S2, controlling three switches in a 3/2 wiring mode of the standby interval branch line and the fourth small hydropower branch line to be closed, so that the bus A and the bus B operate in parallel. Namely closing the eleventh, twelfth and thirteenth circuit breakers 611, 612, 613 in fig. 1.
S3, controlling the switches in the first energy storage system branch line and the second energy storage system branch line to be closed, so that the transformer in the first energy storage system branch line is connected with the bus A, and the transformer in the second energy storage system branch line is connected with the bus B. Namely closing the twentieth circuit breaker 802, and the twenty-first circuit breaker 803 in fig. 1. The transformer is connected to the bus to prepare for zero-step boosting, so that the triggering protection mechanism of the converter in each energy storage system caused by overlarge excitation surge current can be prevented.
S4, starting the first energy storage system corresponding to the first energy storage system branch line, and starting the second energy storage system corresponding to the second energy storage system branch line after a first preset time is spaced.
In one implementation, the first energy storage system and the second energy storage system are activated in a VF droop control mode.
In one possible implementation, the first preset time is set in a range of 1-3 minutes. Preferably, the first preset time is set to 1 minute.
S5, performing circulation control operation.
Wherein the loop control operation includes:
s51, judging whether a first condition is met according to the current energy storage charging power of the system, wherein the first condition is that the current energy storage charging power is smaller than a first power threshold value and a small hydropower branch line is not put in; if yes, go to step S52; if not, executing step S53;
s52, throwing a small hydropower station branch line from the small hydropower station branch line which is not thrown into according to the sequence from the large hydropower station capacity to the small hydropower station branch line, and executing the step S53 after a second preset time interval;
s53, judging whether a second condition is met according to the current energy storage and discharge power of the system, wherein the second condition is that the current energy storage and discharge power is smaller than a second power threshold value and no load branch line is put in; if yes, go to step S54; if not, and the previous step is step S51, ending the cycle control operation; if not, and the previous step of step S53 is step S52, step S51 is executed;
s54, selecting one load branch which is not put into the process according to the order of the importance degree of the load from the large to the small, and executing the step S51 after a third preset time is spaced.
In one manner that can be implemented, the importance of the load in the vital load distribution room branch is greater than the importance of the load in the main line.
In one possible embodiment, the small hydropower stations are arranged in order of the water power capacity from large to small, and the first small hydropower station, the second small hydropower station, the third small hydropower station, and the fourth small hydropower station are arranged in this order.
In one implementation, the first power threshold may be set based on a system maximum stored charging power. Preferably, the first power threshold is set to 20% of the maximum stored charging power of the system; the second power threshold may be set based on the system maximum stored discharge power. Preferably, the second power threshold is set to 20% of the maximum stored discharge power of the system.
According to the embodiment of the invention, the main line, the power grid branch line, the energy storage switch station, the important load power distribution room branch line and the energy storage management system are arranged, so that the constructed black start system can be suitable for micro-grids with multiple hydro-electric power, energy storage and multiple loads, and when a corresponding black start method is executed based on the black start system, the transformer zero lifting voltage of the energy storage system is driven when the energy storage main power supply is started, and the excitation inrush current can be effectively prevented from triggering a protection mechanism of the transformer; the synchronous switching-on is carried out when the small hydropower station is started, and the sectional switching-on is carried out when each branch is switched on, so that the trigger protection mechanism of the converter caused by overlarge line charging current and transformer excitation surge current can be effectively prevented; the power supply is gradually restored in a hydropower-load small-capacity alternate starting mode, so that the impact on a black starting main power supply is effectively reduced.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A black start method for a small hydropower microgrid, the method being based on a black start system for the small hydropower microgrid, the system comprising:
the energy storage switch station comprises a bus A, a bus B, a standby interval branch line, a first small hydropower station branch line, a second small hydropower station branch line, a third small hydropower station branch line, a fourth small hydropower station branch line, a first energy storage system branch line and a second energy storage system branch line;
the tail end of the main line is connected with the bus A, the branch line of the power grid is connected with the bus B, the branch line of the first energy storage system is connected with the bus A, the branch line of the second energy storage system is connected with the bus B, the branch line of the important load distribution room and the branch line of the first small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode, the branch line of the second small hydropower station and the branch line of the third small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode, and the branch line of the standby interval and the branch line of the fourth small hydropower station are connected with the bus A and the bus B in a 3/2 wiring mode;
the energy storage management system is used for controlling the on-off of the corresponding switch of each branch line in the energy storage switch station;
when each branch line in the energy storage switch station is connected with a corresponding bus, the connected switches are all circuit breakers;
the important load distribution room branch line is close to the bus A, and the first small hydropower station branch line is close to the bus B;
the standby interval branch line is close to the bus A, and the fourth small hydropower branch line is close to the bus B;
the method comprises the following steps:
s1, controlling all switches in each branch line, a main line and an important load distribution room branch line in an energy storage switch station to be disconnected;
s2, controlling three switches in a 3/2 wiring mode of the standby interval branch line and the fourth small hydropower branch line to be closed so that the bus A and the bus B operate in parallel;
s3, controlling switches in a first energy storage system branch line and a second energy storage system branch line to be closed, so that a transformer in the first energy storage system branch line is connected to the bus A, and a transformer in the second energy storage system branch line is connected to the bus B;
s4, starting a first energy storage system corresponding to the first energy storage system branch line, and starting a second energy storage system corresponding to the second energy storage system branch line after a first preset time is spaced;
s5, performing circulation control operation;
wherein the loop control operation includes:
s51, judging whether a first condition is met according to the current energy storage charging power of the system, wherein the first condition is that the current energy storage charging power is smaller than a first power threshold value and a small hydropower branch line is not put in; if yes, go to step S52; if not, executing step S53;
s52, throwing a small hydropower station branch line from the small hydropower station branch line which is not thrown into according to the sequence from the large hydropower station capacity to the small hydropower station branch line, and executing the step S53 after a second preset time interval;
s53, judging whether a second condition is met according to the current energy storage and discharge power of the system, wherein the second condition is that the current energy storage and discharge power is smaller than a second power threshold value and no load branch line is put in; if yes, go to step S54; if not, and the previous step is step S51, ending the cycle control operation; if not, and the previous step is step S52, step S51 is executed;
s54, selecting one load branch which is not put into the process according to the order of the importance degree of the load from the large to the small, and executing the step S51 after a third preset time is spaced.
2. The black start method of a small hydropower micro grid according to claim 1, wherein in step S4, the first energy storage system and the second energy storage system are started in a VF sag control mode.
3. The black start method of a small hydropower micro grid according to claim 1, wherein the importance of the load in the important load distribution room branch is greater than the importance of the load in the main line.
4. The black start method of a small hydropower micro grid according to claim 1, wherein the small hydropower branch lines are arranged in order of large hydropower capacity, and are a first small hydropower branch line, a second small hydropower branch line, a third small hydropower branch line, and a fourth small hydropower branch line in this order.
5. The black start method of a small hydropower micro grid according to claim 1, wherein the first power threshold is 20% of the maximum stored charging power of the system; the second power threshold is 20% of the maximum energy storage discharge power of the system.
6. The black start method of a small hydropower micro grid according to claim 1, wherein the first preset time is 1 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111364986.7A CN114094635B (en) | 2021-11-17 | 2021-11-17 | Black-start system and method for small hydropower micro-grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111364986.7A CN114094635B (en) | 2021-11-17 | 2021-11-17 | Black-start system and method for small hydropower micro-grid |
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| CN101552462A (en) * | 2008-12-30 | 2009-10-07 | 上海市电力公司 | Black-start method |
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| CN108306330A (en) * | 2017-12-28 | 2018-07-20 | 吴位跃 | The method that governor black starting-up is utilized under power station isolated power grid linkage and net state |
| CN110994687A (en) * | 2019-12-31 | 2020-04-10 | 广东顺德电力设计院有限公司 | Line transformation method and system with distributed small hydropower stations at tail ends |
| CN210404841U (en) * | 2019-09-27 | 2020-04-24 | 云南华电金沙江中游水电开发有限公司梨园发电分公司 | Novel power supply system for hydropower station in black start |
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| CN101552462A (en) * | 2008-12-30 | 2009-10-07 | 上海市电力公司 | Black-start method |
| WO2014201849A1 (en) * | 2013-06-18 | 2014-12-24 | 国网辽宁省电力有限公司电力科学研究院 | Method for actively optimizing, adjusting and controlling distributed wind power plant provided with energy-storage power station |
| WO2015149619A1 (en) * | 2014-04-01 | 2015-10-08 | 阳光电源股份有限公司 | Black-start method, energy management system and off-grid light storage micro-grid with shared alternating-current bus |
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| CN210404841U (en) * | 2019-09-27 | 2020-04-24 | 云南华电金沙江中游水电开发有限公司梨园发电分公司 | Novel power supply system for hydropower station in black start |
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