AU2023296594A1 - Control debugging method for off-grid wind storage load power generation system - Google Patents
Control debugging method for off-grid wind storage load power generation system Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000010248 power generation Methods 0.000 title claims abstract description 49
- 238000004146 energy storage Methods 0.000 claims abstract description 155
- 230000009194 climbing Effects 0.000 claims abstract description 7
- 238000001983 electron spin resonance imaging Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 12
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000000977 initiatory effect Effects 0.000 claims description 6
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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
- H02J3/381—Dispersed generators
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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
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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
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the 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
- H02J3/38—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
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
- Control Of Eletrric Generators (AREA)
- Wind Motors (AREA)
Abstract
The embodiments of the present application provide a control debugging method for an off-grid wind storage load power generation system. The system comprises a wind power generation branch provided with a wind power generator, an energy storage branch, an active load, and a circuit breaker. The wind power generation branch and the circuit breaker are connected in series, then connected in parallel with the energy storage branch and the active load, and then access a high-voltage bus. The present application controls circuit breaker disconnection, energy storage branch input and active load partial input, and controls the circuit breaker to close, and the wind power generator to start operating; a reactive power of an output end of the energy storage branch is taken as an instruction to control an output power of the energy storage branch, the stator voltage of the wind power generator starts to synchronize with the external voltage of a fan, and a preset grid connection condition is reached; the wind power generator climbs to output an active power according to a given power, and during the fan active climbing, the active load is gradually input. The fan and energy storage power are controlled, and when a starting inductive load during networking is insufficient, the problem of over-voltage caused by long cables can be avoided, which helps the system to operate stably.
Description
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[0001] This application is based on and claims priority to Chinese patent application No. 202210754819.1, filed on June 30, 2022, and entitled "METHOD FOR CONTROLLING AND DEBUGGING OFF-GRID WIND LOAD STORAGE POWER GENERATION SYSTEM", which is incorporated herein by reference in its entirety.
[0002] The disclosure relates to, but is not limited to, a field of wind power generation and energy storage technology, and in particular to a method for controlling and debugging an off-grid wind load storage power generation system.
[0003] In recent years, with the global energy shortage and environmental problems caused by traditional power generation becoming more and more prominent, wind power generation has developed rapidly with its mature technology and commercial potential. An off-grid wind power generation system can operate independently without a support of a large power grid and can supply power to its surroundings. Thus, the off-grid wind power generation system is of great significance to ease the shortage of power supply. However, the wind power generation is characterized by volatility and randomness. Fluctuations in wind speed causes corresponding fluctuations in an output power of a wind generator set, and thus, the wind power generation cannot provide continuous and stable power. The poor stability of the wind power generation may lead to a series of problems, such as the fluctuations in the wind power, output voltage, frequency, and may even threaten the stability and safe operation of the system. Due to the lack of effective support by the large power grid, the aforementioned problems may be more prominent in the off-grid wind power generation system. Since an energy storage system has flexible control and fast response, it can smooth
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the fluctuations in the wind power and provide the effective support for a voltage frequency of the system. Therefore, the energy storage with rational configuration can improve the stability of the system.
[ 0004] At present, most of researches are on grid-connected wind power generation, but the researches on the off-grid wind power generation is relatively scarce. Most of the researches on the off-grid wind power generation may be that the grid-connected wind power generation system is transferred into an isolated-grid operation as a result of some certain reasons. Such researches do not consider the problem of black start-up of the wind power generation system and the problem during the dynamic networking operation of the off-grid wind load storage system. For a dynamic networking device in the off-grid wind load storage system, there is a long-distance power cable between a side of a fan and a high-voltage bus. The lack of the reactive load easily causes the energy storage to absorb more reactive power, and a reactive voltage droop control for voltage-source-type energy storage causes an output voltage of the energy storage to be relatively high. As a result, an overvoltage at a fan end causes problems in the operation of the system.
[0005] Embodiments of the present disclosure aim to provide a method for controlling and debugging an off-grid wind load storage power generation system. Therefore, it can solve the technical problem that the existing off-grid wind load storage system is easy to cause the overvoltage at the fan end due to the existence of the long-distance power cable, resulting in the unstable operation of the system.
[ 0006] An off-grid wind load storage power generation system is provided in the embodiments of the present disclosure, and the system includes a wind power generation branch, an energy storage branch, an active load and a breaker K2.
[ 0007] The wind power generation branch and the breaker K2, which are connected in series, are connected in parallel with the energy storage branch and the active load, and further connected with a high-voltage bus 200. The wind power generation branch includes a wind power generator.
[ 0008] In some embodiments, the wind power generation branch further includes a breaker KI, a converter, a box transformer T and a fan grid-connected cable.
[ 0009] The breaker KI and the converter are connected in parallel to form a parallel branch.
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[0010] An output of the wind power generator is connected with a low-voltage side of the box transformer TI through the parallel branch. Additionally, a high-voltage side of the box transformer T1 is connected with the breaker K2 through the fan grid-connected cable.
[ 0011] In some embodiments, the energy storage branch includes a voltage-source type energy storage system 300, a current-source-type energy storage system 400 and a box transformer T2.
[ 0012] The voltage-source-type energy storage system and the current-source-type energy storage system are connected in parallel, then connected with the high-voltage bus through the box transformer T2.
[ 0013] In some embodiments, the voltage-source-type energy storage system includes a plurality of voltage-source-type energy storage devices connected in parallel. The current source-type energy storage system includes a plurality of current-source-type energy storage devices connected in parallel.
[ 0014] In some embodiments, the voltage-source-type energy storage system adopts a virtual synchronous control mode.
[ 0015] In some embodiments, the current-source-type energy storage system adopts a PQ control mode.
[ 0016] In some embodiments, the wind power generator is a doubly-fed asynchronous wind generator.
[ 0017] In some embodiments, the system further includes the wind load storage coordination control device. The wind load storage coordination control device is configured
to: collect a voltage UO and a current 0 at a low-voltage side of a box transformer T2;
decouple the voltage Uo and the current 0 at the low-voltage side of the box transformer T2
and calculate a reactive powerQA output from the low-voltage side of the box transformer T2, control a current-source-type energy storage system, and set a reactive power reference value of the current-source-type energy storage system as an inverse number of the reactive power at the low-voltage side of the transformer T2, to form a closed-loop control.
[ 0018] Based on same inventive concept, a method for controlling and debugging an off-grid wind load storage power generation system is further provided in the embodiments of the present disclosure. The off-grid wind load storage power generation system is the off-grid wind load storage power generation system provided in the embodiments of the present disclosure. The method includes the following operations.
[ 0019] The breaker K2 is controlled to be disconnected, the energy storage branch is
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put in, and a part of the active load is put in, to form an off-grid load storage system.
[ 0020] The breaker K2 is controlled to be closed, such that the wind power generator starts to work; an output power of the energy storage branch is controlled by using a reactive power at an output of the energy storage branch as an instruction, such that a stator voltage of the wind power generator begins to synchronize with an external voltage of a fan and reaches a preset grid-connection condition, to form an off-grid wind load storage system.
[ 0021] The wind power generator is controlled to climb and output an active power according to a given power, and the active load is gradually put in during an active climbing process of the fan.
[ 0022] In some embodiments, the process of controlling the breaker K2 to be disconnected, putting in the energy storage branch, and putting in the part of the active load, to form the off-grid load storage system, includes the following operations.
[ 0023] The breaker K2 is controlled to be disconnected, while a breaker KI is controlled to be disconnected.
[0024] A voltage-source-type energy storage system and a current-source-type energy load storage system are initiated, and of the active load is put in, to form the off-grid load storage system.
[0025] In some embodiments, in the step of initiating the voltage-source-type energy load storage system and the current-source-type energy storage system, and putting in the A of load the active load, to form the off-grid load storage system, the A of the active load is less than or equal to a total capacity of the voltage-source-type energy storage system.
[0026] In some embodiments, in the step of initiating the voltage-source-type energy load storage system and the current-source-type energy storage system, and putting in the A of the active load, to form the off-grid load storage system, an active power output from the load voltage-source-type energy storage system is equal to the A of the active load that is put in.
[ 0027] In some embodiments, the process of controlling the breaker K2 to be closed, such that the wind power generator starts to work, the output power of the energy storage branch is controlled by using the reactive power at the output of the energy storage branch as the instruction, such that the stator voltage of the wind power generator begins to synchronize with the external voltage of the fan and reaches the preset grid-connection condition, to form the off-grid wind load storage system, includes the following operations.
[ 0028] The breaker K2 is controlled to be closed to complete a line access at a side of
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the fan.
[ 0029] A reactive power at a low-voltage side of a box transformer T2 is measured, and an inverse number of the reactive power is taken as a reactive input instruction for a current-source-type energy storage system.
[ 0030] After the stator voltage of the wind power generator begins to synchronize with the external voltage of the fan and reaches the preset grid-connection condition, a breaker KI is closed, to form the off-grid wind load storage system.
[ 0031] In some embodiments, the preset grid-connection condition specifically includes: a frequency, a phase and an amplitude of the stator voltage of the wind power generator are exactly the same as those of the external voltage.
[ 0032] In some embodiments, the step of measuring the reactive power at the low voltage side of the box transformer T2, and taking the inverse number of the reactive power as the reactive input instruction for the current-source-type energy storage system, specifically includes the following operations. The reactive power at the low-voltage side of the box transformer T2 is measured. A reactive power reference value of the current-source-type energy storage system is set as the inverse number of the reactive power at the low-voltage side of the transformer T2, to form a closed-loop control.
[ 0033] In some embodiments, the step of gradually putting in the active load during the active climbing process of the fan specifically includes the following operations.
[ 0034] At a time moment ti, at which the wind power generator starts to climb, the active load is dynamically putting in gradually. At a time moment t2, at which an output power of the wind power generator is stable, an active power and a reactive power output from the wind power generator are stabilized to respective preset values. The part of the active load that is put in is the same as the preset value of the wind power generator.
[ 0035] In some embodiments, in the step of gradually putting in the active load during the active climbing process of the fan, the method further includes the following operations. From the time moment ti, a reactive power of a current-source-type energy storage system is continuously reduced until the reactive power of the current-source-type energy storage system is completely cut out at the time moment t2.
[ 0036] The embodiments of the present disclosure have the following advantages.
[ 0037] The method for controlling and debugging the off-grid wind load storage power generation system provided in the embodiments of the present disclosure adopts a plurality of types of hybrid energy storage systems. Thus, an accurate output of the voltage, the frequency and the active power can be achieved. The method further avoids the
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overvoltage problem caused by the reactive deviation due to the long cable when only using the voltage-source-type energy storage. Finally, by using the closed-loop control, the black start-up of the fan can be realized on different lines, which is of great significance for the start-up of the off-grid remote fan and the stable operation of the system.
[ 0038] In the embodiments of the present disclosure, after establishing the stable voltage and frequency by the black start-up of the energy storage, the fan is initiated. According to the power coordination controlling and debugging method , the operation of dynamically putting in or cutting out on the fan, the energy storage and the load operated in the isolated grid can be realized, and the real-time power optimization control thereof can be also realized. In the embodiments of the present disclosure, by controlling the power of the fan and the energy storage, the overvoltage problem caused by the long cable can be avoided when the inductive load is not started sufficiently during the networking, which is beneficial for the system to operate stably.
[ 0039] The method for controlling and debugging the off-grid wind load storage power generation system according to the embodiments of the present disclosure can be free from the support of a large power grid, to realize the power supply to the surrounding loads. Such method is very suitable for areas that cannot be effectively covered by the large power grid, such as, a pastoral area, a forest area, an island; and thus, it is of great significance to alleviate the power supply shortage.
[0040] In order to more clearly explain the technical schemes in the specific implementations of the present disclosure, the drawings required for the description of the specific implementations will be briefly introduced below. It is apparent that the drawings described below are some of the implementations of the present disclosure, and the description and drawings forming part of the present disclosure are intended to provide a further understanding of the present disclosure. Schematic embodiments of the present disclosure and the descriptions thereof are used to interpret the present disclosure and do not constitute any undue limitation of the present disclosure. Other drawings may be obtained on the basis of the drawings without creative effort for a person having ordinary skill in the art.
[ 0041] FIG. 1 is a schematic structural diagram of an off-grid wind load storage power generation system according to an embodiment of the present disclosure.
[ 0042] FIG. 2 is a schematic structural diagram of a wind load storage coordination
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control device according to an embodiment of the present disclosure.
[ 0043] FIG. 3 is a schematic diagram of a coordination control for a power of an off grid wind load storage system according to an embodiment of the present disclosure.
[ 0044] Figure 4 is a diagram of a coordination control for power values of respective units in an off-grid wind load storage power generation system according to an embodiment of the present disclosure.
[ 0045] FIG. 5 is a schematic diagram of an automatic response for a power of a voltage-source-type energy storage according to an embodiment of the present disclosure.
[0046] The present disclosure is described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that the embodiments in the present disclosure and the features thereof may be combined with each other without conflict.
[ 0047] The following detailed explanation is illustrative and is intended to provide detailed description in some embodiments of the present disclosure. Unless otherwise specified, all technical terms used in the present disclosure have the same meaning as generally understood by those skilled in the art to which the present disclosure belongs. The terms used in the present disclosure are intended only to describe specific implementations, but not intended to limit exemplary implementations according to the present disclosure.
[ 0048] Since a voltage-source-type energy storage adopts a traditional virtual synchronous control technology, when a wind storage system operates independently, there are an overvoltage of a long cable, load fluctuations and fan power ramp-up. Since the voltage-source-type energy storage uses an active-frequency control and reactive-voltage control, the frequency and the voltage may deviate from rated values, and even exceed limits. In order to solve such problem, in the present disclosure, an active power and a reactive power of the fan are set according to the load and the line impedance of the system. The active load is put in or cut out during the active ramp-up process of the fan, the reactive power generated by the capacitive line is absorbed by the current-source-type energy storage, and the reactive load is compensated to stabilize the frequency and the voltage of the system.
[ 0049] First Embodiment
[ 0050] Referring to FIG. 1, an off-grid wind load storage power generation system is provided in the embodiments of the present disclosure, and the system includes a wind power
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generation branch, an energy storage branch, an active load and a breaker K2. The wind power generation branch includes a wind power generator 100. The energy storage branch includes a plurality of types of hybrid energy storage systems. The wind power generation branch and the breaker K2, which are connected in series, are connected in parallel with the energy storage branch and the active load, and then connected with a high-voltage bus 200.
[ 0051] The hybrid energy storage systems include a voltage-source-type energy storage system 300 and a current-source-type energy storage system 400.
[ 0052] In some embodiments, the wind power generation branch further includes a breaker Ki, a converter 101, a box transformer TI and a fan grid-connected cable 500. The breaker KI and the converter 101 are connected in parallel to form a parallel branch.
[ 0053] In some embodiments, the energy storage branch further includes a box transformer T2. The voltage-source-type energy storage system 300 and the current-source type energy storage system 400 are connected in parallel, and then connected with the high voltage bus 200 through the box transformer T2.
[ 0054] The voltage-source-type energy storage system 300 is formed by m voltage source-type energy storage devices 301 connected in parallel, and the current-source-type energy storage system 400 is formed by n current-source-type energy storage devices 401 connected in parallel. Both m and n are positive integers greater than or equal to 1. That is, the m voltage-source-type energy storage devices 301 form the voltage-source-type energy storage system 300; and the n current-source-type energy storage devices 401 form the current-source-type energy storage system 400. The output of the m voltage-source-type energy storage devices 301 and the output of the n current-source-type energy storage devices 401 are connected with a low-voltage side of the box transformer T2, and a high-voltage side of the box transformer T2 is connected with the high voltage bus 200. The voltage-source type energy storage system 300 adopts a virtual synchronous control mode. The virtual synchronous control mode is classified into an active-frequency control and a reactive-voltage control, to respectively simulate a speed regulation system and an excitation system of the synchronous generator. The current-source-type energy storage system 400 adopts a PQ control mode, which is substantially to separately control the active power and the reactive power that are decoupled.
[ 0055] In some embodiments, an active load P1 is connected with the high voltage bus 200.
[ 0056] In the embodiments of the present disclosure, the hybrid energy storage systems include the voltage-source-type energy storages connected in parallel and the current-
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source-type energy storages connected in parallel. Thus, the stable voltage and frequency as well as the accurate output of the active power can be realized through the voltage-source type energy storage. Meanwhile, due to the existence of the transformer and the long cable, a reactive closed-loop support can be provided by the current-source-type energy storage, thereby avoiding the overvoltage problem caused by the reactive deviation due to the long cable when only using the voltage-source-type energy storage.
[ 0057] In some embodiments, the wind power generator 100 adopts a doubly-fed asynchronous wind generator.
[ 0058] Referring to FIG. 2, an off-grid wind load storage power generation system is provided in the embodiments of the present disclosure, and the system includes a wind load storage coordination control device 20. The wind load storage coordination control device 20 includes a data acquisition module 201, a power calculation module 202, an execution module 203 and a communication management module 204.
[ 0059] The data acquisition module 201 is configured to collect a voltage U 0 and a
current i0 at a low-voltage side of a box transformer T2, and the operation information of the current-source-type energy storage system 400 and the wind power generator 100. The power
calculation module 202 is configured to decouple the voltage U 0and the current i0 at the low voltage side of the box transformer T2, and further calculate a reactive power output QA from
the low-voltage side of the box transformer T2. The execution module 203 is configured to control the powers of the current-source-type energy storage system 400, the active load P1 and the wind power generator 100 through the communication management module 204. When controlling the current-source-type energy storage system 400, a reactive power
reference value of the current-source-type energystoragesystem400issetas ]S_ _ andanactivepowerreference value ofthe current-source-type energy storage system 400 is
QESS set as =0, to form a closed-loop control.
[ 0060] The embodiments of the present disclosure give full play to the advantages of different control types of energy storages, and form the complementation. Here, the voltage source-type energy storage may establish the stable voltage and frequency, provide the system with a self-start-up capability, and automatically respond to the fluctuations of the fan and the active load. The current-source-type energy storage may compensate the reactive power of the system in time. During the initiation process, the wind load storage coordination control device also controls the power of the active load, such that the output active power of the
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voltage-source-type energy storage is maintained near 0.
[ 0061] Second Embodiment
[ 0062] A method for controlling and debugging an off-grid wind load storage power generation system is further provided in the embodiments of the present disclosure. The method is implemented by the following operations S Ito S3.
[ 0063] At SI, the breaker K2 is controlled to be disconnected, the energy storage branch is put in, and a part of the active load is put in, to form an off-grid load storage system.
[ 0064] At S2, the breaker K2 is controlled to be closed, such that the wind power generator starts to work; an output power of the energy storage branch is controlled by using a reactive power at an output of the energy storage branch as an instruction, such that a stator voltage of the wind power generator 100 begins to synchronize with an external voltage of a fan and reaches a preset grid-connection condition, to form an off-grid wind load storage system.
[ 0065] At S3, the wind power generator 100 is controlled to ramp up and output an active power according to a given power, and the active load is gradually put in during an active ramp-up process of the fan.
[ 0066] In some embodiments, the operation S Imay include the following.
[ 0067] The wind load storage coordination control device controls the breaker K2 to be disconnected, initiates the voltage-source-type energy storage system 300 and the current load source-type energy storage system 400, and put in the PO of the active load, to form the off grid load storage system including the hybrid energy storages and the active load. Here, an active power output from the voltage-source-type energy storage system 300 is set to be equal load to the P0 of the active load that is put in; and the active power output from the current source-type energy storage system 400 is set to be 0.
[ 0068] In some embodiments, the operation S2 may include the following.
[ 0069] At a time moment to, after the stable voltage and frequency is output from the off-grid load storage system at the operation Sl, the wind load storage coordination control device controls the breaker K2 to be closed, to complete a line access at a side of the fan.
[ 0070] A reactive power at a low-voltage side A of a box transformer T2 is measured, and an inverse number of the reactive power is taken as a reactive input instruction for the current-source-type energy storage system 400. Thus, a balance among the reactive powers generated by the fan grid-connected cable 500, the box transformer TI and the box transformer T2 can be realized.
2313036PCT-AU-EPRI
[0071] A stator voltage of the wind power generator 100 begins to synchronize with an external voltage of the fan. When a frequency, a phase and an amplitude of the stator voltage of the fan are exactly the same as those of the external voltage (at the time moment ti), the wind load storage coordination control device controls the fan to be grid-connected, and controls the breaker KI to be closed; thus, the wind power generator 100 is connected completely, to form the off-grid wind load storage system.
[ 0072] In some embodiments, the operation S3 may include the following.
[ 0073] The wind power generator 100 is controlled to ramp up and output an active power according to a given power, and the active load is gradually put in during an active ramp-up process of the fan. When an output power of the wind power generator 100 is stable, the dynamic networking of the wind load storage is completed. The system has a strong transient stability, and can respond to the output fluctuations of the fan and realize the operation of putting in or cutting out on the load.
[ 0074] The method for controlling and debugging the off-grid wind load storage power generation system provided in the embodiments of the present disclosure gives full play to the advantages of the voltage-source-type energy storages and the current-source-type energy storages. Here, the voltage-source-type energy storage may establish the stable voltage and frequency of the system, provide the system with the self-start-up capability, and quickly respond to the active power fluctuations of the fan and the active load. To solve the problem that the frequency and the voltage of the off-grid system deviate from the rated values in the traditional virtual synchronous control technology, the current-source-type energy storage in the embodiments of the present disclosure can provide the reactive compensation, such that the voltage of the system may be maintained at the rated value. At the same time, the operation of dynamically putting in or cutting out on the active load can be controlled, the pressure of debugging the active power of the voltage-source-type energy storage can be reduced, and the frequency of the system can be maintained at the rated value.
[ 0075] Referring to FIG. 3, in a specific implementation, when the breaker K2 is
closed, a reactive power QA at a low-voltage side A of the box transformer T2 can be
calculated by measuring and decoupling the voltage U0 and the current i0 at the low-voltage side A of the box transformer T2. The reactive power reference value of the current-source
type energy storage system 400 is set asQ[ef QA ,and the active power reference value of
the current-source-type energy storage system 400 is set as QESS0 'f , to form a closed-loop
2313036PCT-AU-EPRI
control. The inductive reactive powers emitted at the sides of the fan and the load are absorbed by the current-source-type energy storage system 400, and the inductive reactive power absorbed by the voltage-source-type energy storage system 300 is close to 0. Thus, the voltage output from the energy storage can be restored to normal, and can respond to the changes of the reactive load in time, which is conducive to the black start-up and the smooth operation of the system. Before the black start-up starts (at the time moment to), the
instantaneous value QO after the Q- is stabilized is measured. After the fan is stabilized, the
reactive power reference value is QiVA I and the active power reference value isPrem.At the time, the inductive reactive power is absorbed by using the wind power. Instructions for the active power and the reactive power of the wind power generator 100 are shown as formulas (1) and (2):
0, t<ti
P _ = __", ti<t<t 2 t2 - ti
[ 0076] m' , t>t2 (1)
0,o<t1
Q" = I"_, ti<t<t 2 t2 -tI
[ 0077] LQGm' t>t2 (2)
PWrt ___f
[0078] where t2 and t2 are an active ramp-up rate and a reactive ramp-up rate of the wind power generator 100 respectively.
[ 0079] The wind load storage power controlled by the method for controlling and debugging the off-grid wind load storage power generation system is shown in FIG. 4. Based on the aforementioned embodiments, the breaker K2 is closed at the time moment to, and the wind power generator 100 starts to ramp up at the time moment ti. At the time, the active load _ load pload .m1 0 is dynamically put in gradually, and n is put in each time, a total of n times. After the output power is stable at the time moment t2, the active power and the reactive power
output from the wind power generator 100 are stabilized to respective preset values rm and
QGfm, and the black start-up of the system is completed. At the time, the active load put in is
2313036PCT-AU-EPRI
where m rmfin. From the time moment ti, a reactive power of the current-source
type energy storage system 400 is continuously reduced until the reactive power of the current-source-type energy storage system 400 is completely cut out at the time moment t2. From the time moment ti to t2, the reactive power of the current-source-type energy storage is continuously reduced, and the situation of lacking a reactive standby load is considered in the embodiments of the present disclosure. The reactive load P2 marked in FIG. 1 is the reactive load generated after the completion of the black start-up of the system. In the embodiments of the present disclosure, the reactive power of the current-source-type energy storage can be controlled, and the reactive balance and the voltage stability after the stable operation of the system can be maintained. Q Iis the capacitive reactive load generated after the system is stabilized, a time moment t 3 is the time when such load is generated, and a time moment t4 indicates the time when the capacitive load is cut out.
[ 0080] The response power of the voltage-source-type energy storage system 300 is shown in FIG. 5. According to the control and debugging method provided in the embodiments of the present disclosure, the reactive output is 0, and the active output may be maintained near 0 after the wind power generator 100 ramps up. Thus, the problem of the excessive deviation of the voltage and the frequency of the system can be avoided.
[ 0081] Based on the aforementioned technical schemes, by debugging the powers of the energy storages and the fan, and performing the operation of dynamically putting in and cutting out the load, the reactive power and the active power output from the voltage-source type energy storage can be reduced, and the frequency and the voltage of the system can be maintained at the rated values. After the fan is initiated, the energy storage systems can automatically smooth the wind electric field output fluctuations, and further smooth the load output fluctuations.
[ 0082] Based on the method for controlling and debugging the wind load storage system provided in the embodiments of the present disclosure, in the case of the off-grid operation, differentiated dynamically networking control among the wind power generation system, the energy storage systems and the load can be implemented according to different operating conditions. After establishing the stable voltage and frequency by the black start-up of the energy storages, the fan is initiated. According to the strategy, the powers of the fan and the energy storage operated in the isolated gird can be optimized in real time, and the operation of dynamically putting in or cutting out on the load can be controlled. Thus, the balance between the power supply and power consumption of the whole system as well as the
2313036PCT-AU-EPRI
stable and reliable operation of the system can be realized.
[ 0083] In the embodiments of the present disclosure, the off-grid wind load storage system is established step by step firstly, and then the powers of the fan, the energy storage and the load are controlled. Thus, it can solve problem of the influence of the overvoltage of the long cable, the load fluctuations and the power ramp-up of the fan on the deviation of the voltage and the frequency of the system during the establishment and operation of the wind load storage system.
[ 0084] Finally, it should be noted that the aforementioned embodiments are only used to illustrate the technical schemes of the present disclosure and not to limit the present disclosure. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can be made by those skilled to the specific embodiments of the present disclosure, and such modifications or variations belong to the protection scope of the claims of the present disclosure.
[ 0085] Those skilled in the art should understand that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to a disk storage, a Compact Disc Read-Only Memory (CD-ROM), an optical storage, etc.) containing computer-usable program codes.
[ 0086] The present disclosure is described with reference to flowcharts and/or block diagrams of the method, the device (system) and the computer program product according to the embodiments of the present disclosure. It should be understood that each flow and/or block in the flowcharts and/or the block diagrams and a combination of the flows and/or the blocks in the flowcharts and/or the block diagrams can be realized by computer program instructions. Such computer program instructions can be provided for a general computer, a dedicated computer, an embedded processor or processors of other programmable data processing devices to generate a machine, so that an apparatus for realizing functions assigned in one or more flows of the flowcharts and/or one or more blocks of the block diagrams is generated via instructions executed by the computers or the processors of the other programmable data processing devices.
[ 0087] Such computer program instructions can also be stored in a computer readable
2313036PCT-AU-EPRI
memory capable of guiding the computers or the other programmable data processing devices to work in a specific mode, so that a manufactured product including an instruction apparatus is generated via the instructions stored in the computer readable memory, and the instruction apparatus realizes the functions assigned in one or more flows of the flowcharts and/or one or more blocks of the block diagrams.
[ 0088] Such computer program instructions can also be loaded to the computers or the other programmable data processing devices, so that processing realized by the computers is generated by executing a series of operation steps on the computers or the other programmable devices, and therefore the instructions executed on the computers or the other programmable devices provide a step of realizing the functions assigned in one or more flows of the flowcharts and/or one or more blocks of the block diagrams.
[ 0089] Finally, it is to be noted that the aforementioned embodiments are only used to illustrate the technical schemes of the present disclosure and not to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements are made to the specific embodiments of the present disclosure, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present disclosure shall be covered by the protection scope of the claims of the present disclosure.
Claims (15)
1. A method for controlling and debugging an off-grid wind load storage power generation system, wherein the off-grid wind load storage power generation system comprises: a wind power generation branch, an energy storage branch, an active load and a breaker K2; wherein the wind power generation branch and the breaker K2, which are connected in series, are connected in parallel with the energy storage branch and the active load, and further connected with a high-voltage bus (200); the wind power generation branch comprises a wind power generator (100); and the energy storage branch comprises a plurality of types of hybrid energy storage systems; the method comprises: controlling the breaker K2 to be disconnected, putting in the energy storage branch, and putting in a part of the active load, to form an off-grid load storage system; controlling the breaker K2 to be closed, such that the wind power generator (100) starts to work; controlling an output power of the energy storage branch by using a reactive power at an output of the energy storage branch as an instruction, such that a stator voltage of the wind power generator (100) begins to synchronize with an external voltage of a fan and reaches a preset grid-connection condition, to form an off-grid wind load storage system; controlling the wind power generator (100) to climb and output an active power according to a given power, and gradually putting in the active load during an active climbing process of the fan; wherein the step of gradually putting in the active load during the active climbing process of the fan specifically comprises: at a time moment t, at which the wind power generator (100) starts to climb, dynamically putting in the active load gradually; and at a time moment t2, at which an output power of the wind power generator (100) is stable, stabilizing an active power and a reactive power output from the wind power generator (100) to respective preset values, wherein the part of the active load that is put in is the same as the preset value of the wind power generator (100).
2. The method of claim 1, wherein controlling the breaker K2 to be disconnected, putting in the energy storage branch, and putting in the part of the active load, to form the off-grid load storage system, comprises:
2313036PCT-AU-EPRI
controlling the breaker K2 to be disconnected, while controlling a breaker KI to be disconnected; and initiating a voltage-source-type energy storage system (300) and a current-source-type load
energy storage system (400), and putting in O of the active load, to form the off-grid load storage system.
3. The method of claim 2, wherein in the step of initiating the voltage-source-type energy storage system (300) and the current-source-type energy storage system (400), and putting in load load the O of the active load, to form the off-grid load storage system, the A of the active load is less than or equal to a total capacity of the voltage-source-type energy storage system (300).
4. The method of claim 2, wherein in the step of initiating the voltage-source-type energy storage system (300) and the current-source-type energy storage system (400), and putting in load the oa of the active load, to form the off-grid load storage system, an active power output load from the voltage-source-type energy storage system (300) is equal to the O of the active load that is put in.
5. The method of claim 1, wherein controlling the breaker K2 to be closed, such that the wind power generator (100) starts to work; controlling the output power of the energy storage branch by using the reactive power at the output of the energy storage branch as the instruction, such that the stator voltage of the wind power generator (100) begins to synchronize with the external voltage of the fan and reaches the preset grid-connection condition, to form an off-grid wind load storage system, comprises: controlling the breaker K2 to be closed to complete a line access at a side of the fan; measuring a reactive power at a low-voltage side of a box transformer T2, and taking an inverse number of the reactive power as a reactive input instruction for a current-source-type energy storage system (400); and after the stator voltage of the wind power generator (100) begins to synchronize with the external voltage of the fan and reaches the preset grid-connection condition, closing a breaker KI, to form the off-grid wind load storage system.
6. The method of claim 5, the preset grid-connection condition comprises: a frequency, a
2313036PCT-AU-EPRI
phase and an amplitude of the stator voltage of the wind power generator (100) are exactly the same as those of the external voltage.
7. The method of claim 5, wherein the step of measuring the reactive power at the low-voltage side of the box transformer T2, and taking the inverse number of the reactive power as the reactive input instruction for the current-source-type energy storage system (400), comprises: measuring the reactive power at the low-voltage side of the box transformer T2; and setting a reactive power reference value of the current-source-type energy storage system (400) as the inverse number of the reactive power at the low-voltage side of the transformer T2, to form a closed-loop control.
8. The method of claim 1, wherein in the step of gradually putting in the active load during the active climbing process of the fan, the method further comprises: from the time moment tl, continuously reducing a reactive power of a current-source-type energy storage system (400) until the reactive power of the current-source-type energy storage system (400) is completely cut out at the time moment t2.
9. The method of claim 1, wherein the wind power generation branch further comprises: a breaker KI, a converter (101), a box transformer T Iand a fan grid-connected cable (500); the breaker KI and the converter (101) are connected in parallel to form a parallel branch; an output of the wind power generator (100) is connected with a low-voltage side of the box transformer TI through the parallel branch; and a high-voltage side of the box transformer T Iis connected with the breaker K2 through the fan grid-connected cable (500).
10. The method of claim 1, wherein the energy storage branch comprises: a voltage-source type energy storage system (300), a current-source-type energy storage system (400) and a box transformer T2; the voltage-source-type energy storage system (300) and the current-source-type energy storage system (400) are connected in parallel, then connected with the high-voltage bus (200) through the box transformer T2.
11. The method of claim 10, wherein the voltage-source-type energy storage system (300) comprises a plurality of voltage-source-type energy storage devices connected in parallel; and the current-source-type energy storage system (400) comprises a plurality of current-source-
2313036PCT-AU-EPRI
type energy storage devices connected in parallel.
12. The method of claim 10, wherein the voltage-source-type energy storage system (300) adopts a virtual synchronous control mode.
13. The method of claim 10, wherein the current-source-type energy storage system (400) adopts a PQ control mode.
14. The method of claim 1, wherein the wind power generator (100) is a doubly-fed asynchronous wind generator.
15. The method of claim 1, wherein the system further comprises a wind load storage coordination control device; the wind load storage coordination control device is configured
to: collect a voltage Uo and a current '0 at a low-voltage side of a box transformer T2,
decouple the voltage U 0and the current i0 at the low-voltage side of the box transformer T2
and calculate a reactive power QA output from the low-voltage side of the box transformer T2, control a current-source-type energy storage system (400), and set a reactive power reference value of the current-source-type energy storage system (400) as an inverse number of the reactive power at the low-voltage side of the transformer T2, to form a closed-loop control.
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| PCT/CN2023/111740 WO2024002387A1 (en) | 2022-06-30 | 2023-08-08 | Control debugging method for off-grid wind storage load power generation system |
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