CN114094635A - Black start system and method for small hydropower microgrid - Google Patents
Black start system and method for small hydropower microgrid Download PDFInfo
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- CN114094635A CN114094635A CN202111364986.7A CN202111364986A CN114094635A CN 114094635 A CN114094635 A CN 114094635A CN 202111364986 A CN202111364986 A CN 202111364986A CN 114094635 A CN114094635 A CN 114094635A
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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
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of micro-grid application, and discloses a black start system and a black start method for a small hydropower micro-grid. The system comprises a trunk line, a power grid branch line, an energy storage switch station, an important load power distribution room branch line and an energy storage management system, wherein the tail end of the trunk line is provided with a plurality of loads, the tail end of the trunk 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 an 3/2 wiring mode, and the energy storage management system controls the on and 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 output of small hydropower and the load condition, and gradually recovers power supply by adopting a hydropower-load small-capacity alternate start mode, so that the line charging current and the transformer excitation surge current can be prevented from being overlarge, the impact on the black start main power supply is effectively reduced, and the black start method can be suitable for a micro-grid containing multiple hydropower, 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 a black start method for a small hydropower micro-grid.
Background
The black start refers to a process of driving a load in an area to enter an island operation by using a power supply with self-starting capability in the area after a power system is in fault outage, so as to realize power restoration of the load. In order to stably operate the micro-grid and continuously supply power to important loads when the power system fails and stops operating, a black start control strategy of the micro-grid needs to be formulated.
The existing patent (patent application number is CN201410397837.4) provides a method for a regional small hydropower station and new energy complementary microgrid to participate in black start of a power grid, the research object of the patent is a microgrid system comprising 1 small hydropower station, 1 photovoltaic, 1 energy storage, 1 fan and 1 load, and the method adopts a mode of sequentially starting the energy storage, the small hydropower station, the photovoltaic, the fan and the load to complete the start of the microgrid. The system structure of the research object is ideal, the actual power grid is often under the conditions of multiple loads, multiple hydropower stations, multiple energy storage and multiple branches in one region, the power generation capacity of each hydropower station is divided by the size, and the loads not only have difference of importance degree, but also have different capacities. If the power is input indiscriminately, the line charging current and the transformer magnetizing inrush current are overlarge, so that the impact on a black start main power supply is increased, and further, the black start failure and the important load power loss are caused.
Disclosure of Invention
The invention provides a black start system and a black start method for a small hydropower station microgrid, and solves the technical problems that the existing black start control strategy cannot be suitable for a microgrid with multiple hydropower stations, energy storage and multiple loads, and the impact on a black start main power supply is large.
The invention provides a black start system of a small hydropower station micro-grid, which comprises a trunk line with a plurality of loads at the tail end, a grid branch line, an energy storage switch station, an important load power distribution room branch line and an energy storage management system, wherein 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 trunk line is connected with the bus A, the grid branch line is connected with the bus B, the first energy storage system branch line is connected with the bus A, the second energy storage system branch line is connected with the bus B, the important load distribution room branch line and the first small hydropower branch line are connected with the bus A and the bus B in an 3/2 wiring mode, the second small hydropower branch line and the third small hydropower branch line are connected with the bus A and the bus B in an 3/2 wiring mode, and the standby interval branch line and the fourth small hydropower branch line 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 a manner that can be realized by the first aspect of the present invention, when each branch line in the energy storage switchgear station is connected to a corresponding bus, the connected switches are all circuit breakers.
According to one possible implementation of the first aspect of the invention, the vital load distribution room branch is adjacent to the bus bar a and the first small hydropower branch is adjacent to the bus bar B.
According to one possible implementation of the first aspect of the invention, the spare bay branch is adjacent to the busbar a and the fourth small hydropower branch is adjacent to the busbar B.
A second aspect of the present invention provides a black start method for a small hydropower micro-grid, the method being based on the black start system for a small hydropower micro-grid as described in any one of the realizable manners above, the method comprising the steps of:
s1, controlling all switches in each branch line, main line and branch line of important load distribution room in the energy storage switch station to be disconnected;
s2, controlling three switches in a wiring mode of 3/2 between the standby partition branch line and the fourth small hydropower branch line to be closed, so that the bus A and the bus B run in parallel;
s3, controlling switches in a first energy storage system branch and a second energy storage system branch to be closed so that a transformer in the first energy storage system branch is connected to the bus A and a transformer in the second energy storage system branch 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 interval;
s5, performing cycle control operation;
wherein the loop control operation comprises:
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 small hydropower branches are not put into the system; if yes, go to step S52; if not, go to step S53;
s52, throwing a small hydropower branch line from the never-thrown small hydropower branch lines according to the sequence of the water-electricity capacity from large to small, 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 discharge power of the system, wherein the second condition is that the current energy storage discharge power is smaller than a second power threshold value and a loaded branch line is not put into the system; if yes, go to step S54; if not, and the previous step is step S51, ending the loop control operation; if not, and the previous step is step S52, go to step S51;
and S54, selecting one load branch which is not input according to the sequence of the load importance degrees from large to small for inputting, and executing the step S51 after a third preset time interval.
According to one possible 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 activated in a VF droop control mode.
According to one possible implementation of the second aspect of the invention, the importance of the load in the utility branch is greater than the importance of the load in the trunk line.
According to a mode that can be realized in the second aspect of the present invention, the small hydropower branch lines 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, which are arranged in order of the hydropower capacity from large to small.
According to a possible implementation manner of the second aspect of the present invention, the first power threshold is 20% of the maximum energy storage charging power of the system; the second power threshold is 20% of the maximum energy storage discharge power of the system.
According to a possible implementation manner of the second aspect of the invention, the first preset time is 1 minute.
According to the technical scheme, the invention has the following advantages:
the system comprises a trunk line, a power grid branch line, an energy storage switch station, an important load power distribution room branch line and an energy storage management system, wherein the tail end of the trunk line is provided with a plurality of loads, the tail end of the trunk 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 an 3/2 wiring mode, and the energy storage management system controls the on and 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 output of small hydropower and the load condition, and gradually recovers power supply by adopting a hydropower-load small-capacity alternate start mode, so that the line charging current and the transformer excitation surge current can be prevented from being overlarge, the impact on the black start main power supply is effectively reduced, and the black start method can be suitable for a micro-grid containing multiple hydropower, energy storage and multiple loads.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic wiring diagram of a black start system of a small hydropower microgrid according to an alternative embodiment of the invention;
fig. 2 is a flowchart of a black start method of a small hydropower station microgrid according to an alternative embodiment of the present invention.
Description of the drawings:
39T 1-first circuit breaker; 58T 1-second breaker; 601-a third circuit breaker; 602-a fourth circuit breaker; 603-a fifth circuit breaker; 604-sixth circuit breaker; 605-seventh circuit breaker; 606-an 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 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 black start method for a small hydropower microgrid, which are used for solving the technical problems that the existing black start control strategy cannot be suitable for a microgrid with multiple hydropower, energy storage and multiple loads, and the impact on a black start main power supply is large.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Where necessary, the terms "first", "second", etc. 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 is a schematic diagram illustrating a connection diagram of a black start system of a small hydropower microgrid according to an embodiment of the present invention.
The invention provides a black start system of a small hydropower station microgrid, which comprises a trunk line, a power grid branch line, an energy storage switch station, an important load power distribution room branch line and an energy storage management system, wherein the tail end of the trunk line is provided with a plurality of loads;
the tail end of the trunk line is connected with the bus A, the grid branch line is connected with the bus B, the first energy storage system branch line is connected with the bus A, the second energy storage system branch line is connected with the bus B, the important load distribution room branch line and the first small hydropower branch line are connected with the bus A and the bus B in an 3/2 wiring mode, the second small hydropower branch line and the third small hydropower branch line are connected with the bus A and the bus B in an 3/2 wiring mode, and the standby interval branch line and the fourth small hydropower branch line 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 the energy storage management system. In an implementation manner, when each branch line in the energy storage switchgear station is connected to a corresponding bus, the connected switches are all circuit breakers.
As shown in fig. 1, the trunk line includes a first load and a second load, wherein the left side of the first load is connected with a first breaker 39T1, a second breaker 58T1 is connected between the first load and the second load, and a third breaker 601 is arranged between the right end of the second load and the accessed bus a.
A fourth circuit breaker 602 is arranged at the spare interval branch line, and a fifth circuit breaker 603 is arranged at the fourth small hydropower branch line; a sixth circuit breaker 604 is arranged on the right side of a third load at a branch line of the important load power distribution room, a seventh circuit breaker 605 is arranged at a first small hydropower branch line, an eighth circuit breaker 606 is arranged at a third small hydropower branch line, a ninth circuit breaker 607 is arranged at a second small hydropower branch line, and a tenth circuit breaker 608 is arranged at a branch line of the power grid;
the three switches in the 3/2 connection of the spare bay branch to the fourth small hydropower branch are in turn an eleventh circuit breaker 611, a twelfth circuit breaker 612 and a thirteenth circuit breaker 613. The three switches in the 3/2 wiring pattern of the important load distribution room branch line and the first small hydropower branch line are a fourteenth breaker 621, a fifteenth breaker 622, and a sixteenth breaker 623 in this order. The three switches in the 3/2 wiring mode of the third small hydropower branch and the second small hydropower branch are a seventeenth circuit breaker 631, an eighteenth circuit breaker 632 and a nineteenth circuit breaker 633 in sequence; a twentieth circuit breaker 802 is arranged between the first energy storage system branch and the bus A, and a twenty-first circuit breaker 803 is arranged between the second energy storage system branch and the bus B.
The important load distribution room branch line is also provided with a fourth load, a fifth load, a sixth load and a seventh load, and is correspondingly provided with a twenty-second breaker X601, a twenty-third breaker X602, a twenty-fourth breaker X603, a twenty-fifth breaker X801, a twenty-sixth breaker X802 and a twenty-seventh breaker X803.
According to the embodiment of the invention, the branch line of the important load power distribution room and the first small hydropower branch line are connected to the bus A and the bus B in an 3/2 wiring mode, so that the first small hydropower branch line is favorable for preferentially ensuring power supply in an off-grid state, and the power supply reliability of important users is obviously improved.
Further, important load distribution room branch line is close to bus A, first little water electricity branch line is close to bus B, reserve interval branch line is close to bus A, fourth little water electricity branch line is close to bus B to put into little water electricity branch line more nimble.
The invention also provides a black start method of the small hydropower station micro-grid, which is based on the black start system of the small hydropower station micro-grid in any one of the embodiments.
As shown in fig. 2, the method comprises the steps of:
and S1, controlling all switches in each branch line in the energy storage switch station, the main line and the important load distribution room branch line to be disconnected.
S2, controlling the three switches in the wiring mode of 3/2 of the spare partition branch line and the fourth small hydropower branch line to be closed, so that the bus A and the bus B run in parallel. I.e. closing the eleventh, twelfth and thirteenth breakers 611, 612, 613 in fig. 1.
And S3, controlling the switches in the first energy storage system branch and the second energy storage system branch to be closed so that the transformer in the first energy storage system branch is connected to the bus A and the transformer in the second energy storage system branch is connected to the bus B. I.e., closing the twentieth breaker 802, and the twenty-first breaker 803 in fig. 1. The transformer is connected to the bus to prepare for zero starting boosting, and therefore the protection mechanism can be favorably prevented from being triggered by converters in each energy storage system due to overlarge magnetizing inrush current.
And 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 interval.
In one implementation, the first and second energy storage systems are enabled in a VF droop control mode.
In one implementation, the first preset time is set in a range of 1-3 minutes. Preferably, the first preset time is set to 1 minute.
And S5, performing a circulation control operation.
Wherein the loop control operation comprises:
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 small hydropower branches are not put into the system; if yes, go to step S52; if not, go to step S53;
s52, throwing a small hydropower branch line from the never-thrown small hydropower branch lines according to the sequence of the water-electricity capacity from large to small, 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 discharge power of the system, wherein the second condition is that the current energy storage discharge power is smaller than a second power threshold value and a loaded branch line is not put into the system; if yes, go to step S54; if not, and the previous step is step S51, ending the loop control operation; if not, and the previous step of the step S53 is the step S52, execute the step S51;
and S54, selecting one load branch which is not put into the load branch to put into the load branch according to the sequence of the load importance degrees from large to small, and executing the step S51 after a third preset time interval.
In one possible embodiment, the importance of the load in the main line is greater than the importance of the load in the main load distribution room branch.
In one mode that can be realized, in the small hydropower branch, arrange from big to little according to the water and electricity capacity in proper order be first small hydropower branch, second small hydropower branch, third small hydropower branch and fourth small hydropower branch.
In one implementation, the first power threshold may be set according to a system maximum energy storage charging power. Preferably, the first power threshold is set to be 20% of the maximum energy storage charging power of the system; the second power threshold may be set according to a maximum energy storage discharge power of the system. Preferably, the second power threshold is set to 20% of the maximum energy storage 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 distribution room branch line and the energy storage management system are arranged, so that the constructed black start system can be suitable for a micro-grid with multiple hydropower, energy storage and multiple loads; synchronous switching-on is carried out when the small hydropower station is started, and sectional input is carried out when each branch circuit is switched on, so that a converter trigger protection mechanism caused by overlarge line charging current and transformer excitation surge current can be effectively prevented; the power supply is gradually recovered in a mode of water, electricity and load small-capacity alternate starting, and the impact on a black start main power supply is effectively reduced.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A black start system of a small hydropower station micro-grid is characterized by comprising a trunk line, grid branch lines, an energy storage switch station, important load distribution room branch lines and an energy storage management system, wherein the tail end of the trunk line is provided with a plurality of loads, and 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 trunk line is connected with the bus A, the grid branch line is connected with the bus B, the first energy storage system branch line is connected with the bus A, the second energy storage system branch line is connected with the bus B, the important load distribution room branch line and the first small hydropower branch line are connected with the bus A and the bus B in an 3/2 wiring mode, the second small hydropower branch line and the third small hydropower branch line are connected with the bus A and the bus B in an 3/2 wiring mode, and the standby interval branch line and the fourth small hydropower branch line 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.
2. The black start system of a small hydropower station micro-grid according to claim 1, wherein when each branch line in the energy storage switching station is connected to a corresponding bus, the connected switches are all circuit breakers.
3. The black start system of the small hydropower microgrid of claim 1, wherein the vital load distribution room branch is proximate to the bus bar a and the first small hydropower branch is proximate to the bus bar B.
4. A black start system for a small hydropower microgrid according to claim 3, characterized in that the spare bay branch is close to the busbar a and the fourth small hydropower branch is close to the busbar B.
5. A black start method of a small hydropower microgrid, which is characterized in that the black start system based on the small hydropower microgrid of any one of claims 1 to 4 comprises the following steps:
s1, controlling all switches in each branch line, main line and branch line of important load distribution room in the energy storage switch station to be disconnected;
s2, controlling three switches in a wiring mode of 3/2 between the standby partition branch line and the fourth small hydropower branch line to be closed, so that the bus A and the bus B run in parallel;
s3, controlling switches in a first energy storage system branch and a second energy storage system branch to be closed so that a transformer in the first energy storage system branch is connected to the bus A and a transformer in the second energy storage system branch 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 interval;
s5, performing circulation control operation;
wherein the loop control operation comprises:
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 small hydropower branches are not put into the system; if yes, go to step S52; if not, go to step S53;
s52, throwing a small hydropower branch line from the never thrown small hydropower branch lines according to the sequence of the water-electricity capacities from large to small, 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 discharge power of the system, wherein the second condition is that the current energy storage discharge power is smaller than a second power threshold value and a loaded branch line is not put into the system; if yes, go to step S54; if not, and the previous step is step S51, ending the loop control operation; if not, and the previous step is step S52, go to step S51;
and S54, selecting one load branch which is not put into the load branch to put into the load branch according to the sequence of the load importance degrees from large to small, and executing the step S51 after a third preset time interval.
6. The black start method for the small hydropower microgrid of claim 5, wherein in step S4, the first energy storage system and the second energy storage system are started in a VF droop control mode.
7. The black start method of a small hydropower microgrid of claim 5, wherein the importance of the load in the important load distribution room branch line is greater than the importance of the load in the main line.
8. The black start method of the small hydropower station microgrid according to claim 5, characterized in that the small hydropower branch lines are sequentially 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 the order of the hydropower capacity from large to small.
9. The black start method of the small hydropower grid according to claim 5, wherein the first power threshold is 20% of a maximum stored energy charging power of a system; the second power threshold is 20% of the maximum energy storage discharge power of the system.
10. The black start method of a small hydropower microgrid of claim 5, 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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| 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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