CN114825487A - Off-grid wind storage load power generation system and control debugging method - Google Patents
Off-grid wind storage load power generation system and control debugging method Download PDFInfo
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- CN114825487A CN114825487A CN202210754819.1A CN202210754819A CN114825487A CN 114825487 A CN114825487 A CN 114825487A CN 202210754819 A CN202210754819 A CN 202210754819A CN 114825487 A CN114825487 A CN 114825487A
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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
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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
- 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
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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
- 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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- Control Of Eletrric Generators (AREA)
- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention discloses an off-grid wind storage load power generation system and a control and debugging method, wherein the off-grid wind storage load power generation system comprises the following steps: the system comprises a wind power generation branch with a wind power generator, an energy storage branch, an active load and a circuit breaker; the wind power generation branch circuit is connected with the breaker in series, then is connected with the energy storage branch circuit and the active load in parallel, and then is connected with the high-voltage bus. The method comprises the steps of firstly, controlling a breaker to be disconnected, putting an energy storage branch into the breaker and putting a part of active load into the breaker; controlling the circuit breaker to be closed, and starting the wind driven generator to work; controlling the output power of the energy storage branch circuit by taking the reactive power at the output end of the energy storage branch circuit as an instruction, and enabling the stator voltage of the wind driven generator and the external voltage of the fan to be synchronous and reach a preset grid-connected condition; the wind driven generator outputs active power according to given power climbing, and active load is gradually input in the active climbing process of the fan. By controlling the power of the fan and the stored energy, when the starting inductive load is insufficient in the networking process, the overvoltage problem caused by a long cable can be avoided, and the system can run stably.
Description
Technical Field
The invention belongs to the technical field of wind power generation and energy storage, and particularly relates to an off-grid wind energy storage power generation system and a control debugging method.
Background
In recent years, wind power generation has been rapidly developed with its mature technical and commercial potential as global energy shortage and environmental problems caused by conventional power generation have been more and more prominent. The off-grid wind power generation system can independently operate under the condition of no large power grid support, supplies power to the periphery of the off-grid wind power generation system, and has important significance for relieving the shortage of power supply. However, wind power generation has volatility and randomness, and wind speed fluctuation can cause corresponding fluctuation of output power of a wind turbine generator, so that the wind power generation cannot provide continuous and stable power, the power generation stability is poor, a series of problems such as wind power, output voltage and frequency fluctuation are caused, and even the stable and safe operation of a system is threatened. In an off-grid wind power generation system, the above problem will be more pronounced due to the lack of effective support of a large grid. The energy storage system is flexible to control and quick in response, can stabilize wind power fluctuation, and provides effective support for the voltage frequency of the system. Therefore, the reasonably configured energy storage can improve the stability of the system.
At present, most of the research on wind power generation is of a grid-connected type, and the research on off-grid type wind power generation is less. Most of researches on off-grid wind power generation are as follows: the grid-connected wind power generation system is switched to isolated network operation for some reasons, and the problems existing in the black start of the wind power generation system and the dynamic networking operation of the off-grid wind storage system are not considered. In the dynamic networking device of the off-grid wind energy storage system, a remote power cable is arranged between a wind turbine side and a high-voltage bus, the lack of reactive load easily enables the reactive power absorbed by energy storage to be more, and the reactive voltage droop control of the voltage source type energy storage enables the energy storage output voltage to be too high, so that the overvoltage at the wind turbine side is caused, and the system operation is in a problem.
Disclosure of Invention
The invention aims to provide an off-grid wind storage and load power generation system and a control and debugging method, and aims to solve the technical problem that the existing off-grid wind storage and load power generation system is easy to cause overvoltage at a fan end due to the existence of a long-distance power cable, so that the system is unstable in operation.
The invention provides an off-grid wind storage load power generation system, which comprises: a wind power generation branch, an energy storage branch, an active load and a breaker K2;
the wind power generation branch circuit is connected in series with a breaker K2, then is connected in parallel with an energy storage branch circuit and an active load, and then is connected into a high-voltage bus 200; the wind power generation branch comprises a wind power generator.
Preferably, the wind power generation branch further comprises a circuit breaker K1, a current transformer, a box-type transformer T1 and a fan grid-connected cable;
the breaker K1 and the current transformer are connected in parallel to form a parallel branch;
the output end of the wind driven generator is connected with the low-voltage side of the box type transformer T1 through a parallel branch; and the high-voltage side of the box type transformer T1 is connected with a breaker K2 through a fan grid-connected cable.
Preferably, the energy storage branch comprises a voltage source type energy storage system 300, a current source type energy storage system 400 and a box type transformer T2;
the voltage source type energy storage system and the current source type energy storage system are connected in parallel and are connected with a high-voltage bus through a box type transformer T2.
Preferably, the voltage source type energy storage system comprises a plurality of voltage source type energy storage devices connected in parallel; the current source type energy storage system comprises a plurality of current source type energy storage devices which are connected in parallel.
Preferably, the voltage source type energy storage system adopts a virtual synchronous control mode.
Preferably, the current source type energy storage system adopts a PQ control mode.
Preferably, the wind power generator is a double-fed asynchronous wind power generator.
Preferably, the system also comprises a wind storage and load coordination control device; the wind storage and load coordination control device is used for collecting the voltage of the low-voltage side of the box-type transformer T2u 0 And currenti 0 (ii) a Voltage to low voltage side of header transformer T2u 0 And currenti 0 Decoupling and calculating the reactive power emitted by the low-voltage side of the header transformer T2Q A (ii) a And controlling the current source type energy storage system, and setting the reactive power reference value of the current source type energy storage system as the inverse number of the reactive power of the low-voltage side of the transformer T2 to form closed-loop control.
Based on the same invention concept, the invention also provides a control and debugging method for the off-grid wind storage and power generation system, wherein the off-grid wind storage and power generation system is the off-grid wind storage and power generation system provided by the invention, and the control and debugging method comprises the following steps:
controlling a breaker K2 to be disconnected, putting an energy storage branch into the energy storage branch, and putting a part of active load into the energy storage branch, so as to form an off-grid type energy storage system;
controlling a circuit breaker K2 to be closed, and starting the wind driven generator to work; controlling the output power of the energy storage branch by taking the reactive power at the output end of the energy storage branch as an instruction, and enabling the stator voltage of the wind driven generator and the external voltage of the fan to be synchronous and reach a preset grid-connected condition, so that an off-grid wind storage system is formed;
the wind driven generator outputs active power according to given power climbing, and active load is gradually input in the active climbing process of the fan.
Preferably, the off-grid type storage system, in which the control circuit breaker K2 is opened, the energy storage branch is put into use, and a part of the active load is put into use, includes:
controlling a breaker K2 to be opened, and simultaneously controlling a breaker K1 to be opened;
starting a voltage source type energy storage system and a current source type energy storage system to supply power to the load
And (5) putting into the system to form an off-grid type storage system.
Preferably, the starting voltage source type energy storage system and the current source type energy storage system are used for converting active load into active load
The active load is put into the step of forming an off-grid type storage system
Less than or equal to the total capacity of the voltage source type energy storage system.
Preferably, the starting voltage source type energy storage system and the current source type energy storage system are used for converting active load into active load
Inputting to form an off-grid type energy storage system, wherein the voltage source type energy storage system outputs active power equal to the input active load
。
Preferably, the control circuit breaker K2 is closed, and the wind driven generator starts to work; the output power of the energy storage branch is controlled by taking the reactive power of the output end of the energy storage branch as an instruction, the stator voltage of the wind driven generator and the external voltage of the fan start to be synchronous, and the preset grid-connected condition is achieved, and the off-grid wind storage system is formed at the moment and comprises the following components:
controlling a breaker K2 to close to finish the access of the side line of the fan;
measuring the reactive power of the low-voltage side of the box-type transformer T2, and taking the opposite number of the reactive power as a reactive input instruction of the current source type energy storage system;
the stator voltage of the wind driven generator and the external voltage of the fan start to be synchronous, and after the preset grid-connected condition is achieved, the circuit breaker K1 is closed, so that the off-grid wind storage system is formed.
Preferably, the preset grid-connected condition specifically includes: the stator voltage of the wind driven generator is completely consistent with the frequency, the phase and the amplitude of the external voltage.
Preferably, the step of measuring the reactive power at the low-voltage side of the box-type transformer T2 and taking the opposite number of the reactive power as a reactive input instruction of the current source type energy storage system specifically includes: measuring the reactive power of the low-voltage side of the box-type transformer T2; and setting the reactive power reference value of the current source type energy storage system as the inverse number of the reactive power of the low-voltage side of the transformer T2 to form closed-loop control.
Preferably, in the active climbing process of the wind turbine, the step of gradually putting into active load specifically includes:
at the time of t1, the power of the wind driven generator begins to climb, and active load is dynamically put into the wind driven generator in times; after the output power of the wind driven generator is stable at the time t2, the active power and the reactive power output by the wind driven generator are respectively stabilized to a set value; the active load put into the wind turbine is the same as the set value of the wind turbine.
Preferably, in the step of gradually putting in the active load during the active climbing of the wind turbine, the reactive power of the current source type energy storage system is continuously reduced starting at time t1 until the wind turbine is completely switched out at time t 2.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an off-grid wind storage power generation system and a control and debugging method, wherein various types of hybrid energy storage systems are adopted, so that accurate output of voltage, frequency and active power can be realized; the problem of overvoltage caused by reactive deviation caused by long cables due to the fact that only voltage source type energy storage is adopted is avoided, and finally, due to the fact that closed-loop control is adopted, black starting of the fan can be achieved on different lines, and the method has great significance for starting of the off-grid type far-end fan and stable operation of a system.
The invention firstly establishes stable voltage and frequency by energy storage black start, then starts the fan, and carries out equipment dynamic switching and real-time power optimization control on the fan, the energy storage and the load which run in the isolated network according to a power coordination control debugging method. By controlling the power of the fan and the stored energy, the invention can avoid the overvoltage problem caused by a long cable when the inductive load is insufficient during the networking process, and is beneficial to the stable operation of the system.
The control and debugging method can be separated from the support of a large power grid, realizes the power supply of peripheral loads, is very suitable for the areas which cannot be effectively covered by the large power grid, such as pasturing areas, forest areas, islands and the like, and has important significance for relieving the tension of power supply.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an off-grid wind storage and power generation system according to the present invention;
FIG. 2 is a schematic structural diagram of a wind storage coordination control device according to the present invention;
FIG. 3 is a schematic diagram of power coordination control of an off-grid wind storage system;
FIG. 4 is a control diagram for coordinating power values of units of an off-grid wind storage load power generation system;
fig. 5 is a schematic diagram of the voltage source type energy storage automatic response power.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Because the voltage source type energy storage adopts the traditional virtual synchronous control technology, when the wind storage system operates independently, the conditions of long cable overvoltage, load fluctuation, fan power climbing and the like exist. Since voltage source type energy storage uses both active-frequency control and reactive-voltage control, the frequency and voltage can deviate from nominal values and even out of limits. In order to solve the problem, the invention firstly sets the active power and the reactive power of the fan according to the load and the line impedance of the system. And in the active climbing process of the fan, active load is switched, reactive power generated by a capacitive line is absorbed through current source type energy storage, the reactive load is compensated, and the system frequency and voltage are stabilized.
Example 1
Referring to fig. 1, the present invention provides an off-grid wind storage load power generation system, including: a wind power generation branch, an energy storage branch, an active load and a breaker K2; the wind power generation branch comprises a wind power generator 100; the energy storage branch comprises various types of hybrid energy storage systems;
the wind power generation branch circuit is connected with the breaker K2 in series, then is connected with the energy storage branch circuit and the active load in parallel, and then is connected with the high-voltage bus 200.
The hybrid energy storage system includes a voltage source type energy storage system 300 and a current source type energy storage system 400.
Further, the wind power generation branch also comprises a breaker K1, a converter 101, a box-type transformer T1 and a fan grid-connected cable 500;
the breaker K1 and the converter 101 are connected in parallel to form a parallel branch;
the output end of the wind driven generator 100 is connected with the low-voltage side of the box-type transformer T1 through a parallel branch; the high-voltage side of the box type transformer T1 is connected with a breaker K2 through a fan grid-connected cable 500.
Further, the energy storage branch also comprises a box type transformer T2. The voltage source energy storage system 300 and the current source energy storage system 400 are connected in parallel and connected to the high voltage bus 200 through a box transformer T2.
The voltage source type energy storage system 300 is formed by connecting m voltage source type energy storage devices 301 in parallel; the current source energy storage system 400 is formed by connecting n current source energy storage devices 401 in parallel. m and n are both positive integers greater than or equal to 1. The m voltage source type energy storage devices 301 form a voltage source type energy storage system 300; the n current source type energy storage devices 401 constitute a current source type energy storage system 400; the output ends of the m voltage source type energy storage devices 301 and the n current source type energy storage devices 401 are connected with the low-voltage side of the box-type transformer T2; the high voltage side of the junction box transformer T2 is connected to the high voltage bus 200. The voltage source type energy storage system 300 adopts a virtual synchronous control type, which is divided into active frequency control and reactive voltage control, and respectively simulates the speed regulation and excitation system of a synchronous generator. The current source energy storage system 400 employs a PQ control mode, which essentially decouples the active power and the reactive power and then controls them separately.
An active load P1 is connected to the high voltage bus 200.
The voltage source type and current source type energy storage multi-machine parallel hybrid energy storage system can realize the stability of voltage and frequency and the accurate output of active power through voltage source type energy storage; meanwhile, due to the existence of the transformer and the long cable, the current source type energy storage can provide reactive closed loop support, and the overvoltage problem caused by reactive deviation due to the long cable only adopting the voltage source type energy storage is avoided.
In one embodiment, wind turbine 100 is a double-fed asynchronous wind turbine.
Referring to fig. 2, the off-grid wind storage-load power generation system of the present invention further includes a wind storage-load coordination control device; the wind storage and load coordination control device comprises a data acquisition module, a power calculation module, an execution module and a communication module;
the data acquisition module is used for acquiring the voltage of the low-voltage side of the box-type transformer T2u 0 And currenti 0 And operation information of the current source type energy storage system 400 and the wind turbine 100;
a power calculation module for calculating the voltage of the low-voltage side of the header transformer T2u 0 And currenti 0 Decoupling and calculating the reactive power emitted by the low-voltage side of the header transformer T2Q A ；
The execution module is used for carrying out the operation on the current source type energy storage system 400, the active load P1 and the wind driven generator 100 through the communication management moduleAnd (4) controlling power. When controlling the current source type energy storage system 400, the reactive power reference value of the current source type energy storage system 400 is set
Reference value of active power
And closed-loop control is formed.
The invention gives full play to the advantages of energy storage of different control types and forms complementation. The voltage source type energy storage can establish stable voltage and frequency, provides system self-starting capability, and automatically responds to the fluctuation of a fan and active load. The current source type energy storage can compensate the reactive power of the system in time. During the starting process, the wind energy storage and load coordination control device also controls the power of an active load, so that the voltage source type energy storage output active power is maintained near 0.
Example 2
The invention also provides a control and debugging method for the off-grid wind storage and power generation system, which comprises the following steps:
s1, controlling a breaker K2 to be disconnected, putting the energy storage branch into operation, and putting a part of active load into operation, so that an off-grid type energy storage system is formed;
s2, controlling a breaker K2 to be closed, and enabling the wind driven generator 100 to start working; controlling the output power of the energy storage branch by taking the reactive power at the output end of the energy storage branch as an instruction, and enabling the stator voltage of the wind driven generator 100 and the external voltage of the fan to be synchronous and reach a preset grid-connected condition, so that an off-grid wind storage system is formed;
s3, the wind driven generator 100 outputs active power according to given power climbing, and active load is gradually put into the wind driven generator in the active climbing process.
Step S1 specifically includes:
the wind-load coordination control device controls the breaker K2 to be disconnected, starts the voltage source type energy storage system 300 and the current source type energy storage system 400, and puts active load into
The off-grid type storage system is formed by the hybrid energy storage and the active load. Wherein the output active power of the voltage source type energy storage system 300 is set to be equal to the input active load
The output active power of the current source energy storage system 400 is 0.
Step S2 specifically includes:
t 0 at the moment, after the off-grid type storage system outputs stable voltage and frequency, the wind storage coordination control device controls a breaker K2 to be closed, and the access of a fan side line is finished;
measuring reactive power at the low-voltage side A of the box type transformer T2, and taking the opposite number of the reactive power as a reactive input instruction of the current source type energy storage system 400 to balance the reactive power generated by the fan grid-connected cable 500, the box type transformer T1 and the box type transformer T2;
the stator voltage of the wind driven generator 100 and the external voltage of the fan start to be synchronous, when the frequency, the phase and the amplitude of the stator voltage of the fan are completely consistent (at the moment of t 1), the wind storage coordination control device controls the fan grid-connected circuit breaker K1 to be closed, and the wind driven generator 100 is completely connected to form an off-grid wind storage system;
step S3 specifically includes:
the wind driven generator 100 outputs active power according to given power climbing, and active load is gradually input in the active climbing process of the fan. And when the power output of the wind driven generator 100 is stable, the wind, the storage and the load complete dynamic networking. The system has stronger transient stability and can respond to the output fluctuation and load switching of the fan.
The invention provides an off-grid wind storage load power generation system and a control and debugging method, which give full play to the advantages of voltage source type and current source type energy storage. The voltage source type energy storage can establish stable system voltage and frequency, provides system self-starting capability, and quickly responds to active power fluctuation of a fan and an active load. Aiming at the problem that the frequency and the voltage of an off-grid system deviate from a rated value due to the traditional virtual synchronous control technology, the invention adopts the current source type energy storage to provide reactive compensation, so that the voltage of the system is maintained at the rated value, and meanwhile, the dynamic switching of active load is controlled, so that the active power regulation pressure of the voltage source type energy storage is reduced, and the frequency of the system is maintained at the rated value.
In one embodiment, please refer to FIG. 3: after closing the circuit breaker K2, the voltage and current at the low-voltage side A of the tank transformer T2 are measuredu 0 、i 0 Decoupling and calculating the reactive power emitted from AQ A . Reactive power reference for current source type energy storage system 400
Reference value of active power
And closed-loop control is formed. The current source type energy storage system 400 is used for absorbing inductive reactive power generated by the fan side and the load side, and the inductive reactive power absorbed by the voltage source type energy storage system 300 is close to 0, so that the energy storage voltage output can be recovered to be normal, the change of the reactive load can be responded in time, and the black start and the stable operation of the system are facilitated. Before the start of black start (t 0), it was measuredQ A Stabilized instantaneous valueQ 0 Reactive reference value after fan stabilization
The active reference value is
. And wind power is utilized to absorb inductive reactive power. The active and reactive power commands of the wind turbine 100 are as follows:
wherein
And
active and reactive ramp rates for wind turbine 100, respectively.
The wind storage power controlled by the method is shown in figure 4,t 0 the circuit breaker K2 is closed at a time,t 1 at the moment, the power of the wind driven generator 100 begins to climb, the active load is dynamically put into the wind driven generator in times, and each time the active load is put into the wind driven generator
And the number of the reaction cycles is n times,t 2 after the output power is stabilized, the active power and the reactive power output by the wind power generator 100 are stabilized to the set values respectively
And
and the system black start is completed. The active load put into this moment is
Wherein
。t 1 The moment begins, the reactive power of the current-source energy storage system 400 is continuously reduced until it is completely switched out at time t 2. t is t 1 To t 2 The reactive power of the current source type energy storage is continuously reduced, the invention considers the condition of no reactive standby load, the reactive load P2 marked on figure 1 is the reactive load generated after the system is started in black, and the invention can control the reactive power of the current source type energy storage, and continuously keep the reactive balance and the voltage stability after the system runs stably. Q 1 Is the capacitive reactive load, t, generated after the system has stabilized 3 Is the negativeThe time of charge generation; t4 represents the capacitive load dump.
Voltage source type energy storage system 300 response power as shown in fig. 5, the reactive output is 0 and the active output can be maintained near 0 after wind turbine 100 climbs the slope by the method according to the present invention. The problem of overlarge system voltage and frequency offset is avoided.
By adopting the technical scheme, the reactive power and the active power output by the voltage source type energy storage are reduced by regulating the power of the energy storage and the fan and dynamically switching the load, so that the frequency voltage of the system is maintained at a rated value; when the fan is started, the energy storage system can automatically smooth the output fluctuation of the wind power plant and can also stabilize the output fluctuation of the load.
The control debugging method of the wind power storage system provided by the invention can be used for carrying out differentiated dynamic networking control on the wind power generation system, the energy storage system and the load according to different operating conditions under the off-grid operating condition. The method comprises the steps of firstly establishing stable voltage and frequency by energy storage black start, then starting the fan, carrying out real-time optimization on the power of the fan and the energy storage in isolated network operation and carrying out dynamic switching control on load according to a strategy, so as to realize balanced power supply and utilization of the whole system and stable and reliable operation.
The off-grid wind storage system is built step by step, and then the fan, the stored energy and the load power are controlled, so that the influence of the conditions of overvoltage, load fluctuation, fan power climbing and the like of a long cable on the voltage and frequency deviation of the system in the building and running processes of the wind storage system can be solved.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and the present invention is described in detail with reference to the above embodiments, and it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the embodiments of the invention by those skilled in the art, which modifications and equivalents are within the scope of the claims appended hereto.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (17)
1. An off-grid wind-storage-charge-generation system, comprising: a wind power generation branch, an energy storage branch, an active load and a breaker K2;
the wind power generation branch circuit is connected with a breaker K2 in series, then is connected with an energy storage branch circuit and an active load in parallel, and then is connected with a high-voltage bus (200); the wind power generation branch comprises a wind power generator (100); the energy storage branch comprises various types of hybrid energy storage systems.
2. The system according to claim 1, characterized in that said wind power branch further comprises a circuit breaker K1, a converter (101), a box transformer T1 and a wind turbine grid connection cable (500);
the breaker K1 and the converter (101) are connected in parallel to form a parallel branch;
the output end of the wind driven generator (100) is connected with the low-voltage side of the box type transformer T1 through a parallel branch; the high-voltage side of the box type transformer T1 is connected with a breaker K2 through a fan grid-connected cable (500).
3. The system 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 type transformer T2;
the voltage source type energy storage system (300) and the current source type energy storage system (400) are connected in parallel and are connected with the high-voltage bus (200) through a box type transformer T2.
4. The system of claim 3, wherein the voltage source energy storage system (300) comprises a plurality of voltage source energy storage devices connected in parallel; the current source type energy storage system (400) comprises a plurality of parallel current source type energy storage devices.
5. The system of claim 3, wherein the voltage source energy storage system (300) employs a virtual synchronous control mode.
6. The system of claim 3, wherein the current source energy storage system (400) employs a PQ control mode.
7. The system according to claim 1, characterized in that the wind generator (100) is a double-fed asynchronous wind generator.
8. The system of claim 1, further comprising a wind storage coordination control device; the wind storage and load coordination control device is used for collecting the voltage of the low-voltage side of the box-type transformer T2u 0 And currenti 0 (ii) a Voltage to low voltage side of header transformer T2u 0 And currenti 0 Decoupling and calculating the reactive power emitted by the low-voltage side of the header transformer T2Q A (ii) a And controlling the current source type energy storage system (400), and setting the reactive power reference value of the current source type energy storage system (400) as the inverse number of the reactive power of the low-voltage side of the transformer T2 to form closed-loop control.
9. A control debugging method for an off-grid wind storage and power generation system, which is characterized in that the off-grid wind storage and power generation system is the off-grid wind storage and power generation system of any one of claims 1 to 8, and the control debugging method comprises the following steps:
controlling a breaker K2 to be disconnected, putting an energy storage branch into the energy storage branch, and putting a part of active load into the energy storage branch, so as to form an off-grid type energy storage system;
controlling a circuit breaker K2 to close, and starting the wind driven generator (100) to work; controlling the output power of the energy storage branch by taking the reactive power at the output end of the energy storage branch as an instruction, and enabling the stator voltage of the wind driven generator (100) and the external voltage of the fan to be synchronous and reach a preset grid-connected condition, so that an off-grid wind storage system is formed;
the wind driven generator (100) outputs active power according to given power climbing, and active load is gradually input in the active climbing process of the fan.
10. The control debugging method according to claim 9, wherein the control breaker K2 is opened, the energy storage branch is put into use, and a part of active load is put into use, and when the off-grid type energy storage system is configured, the method comprises:
controlling a breaker K2 to be opened, and simultaneously controlling a breaker K1 to be opened;
starting the voltage source type energy storage system (300) and the current source type energy storage system (400) to convert the active load
And (5) putting into the system to form an off-grid type storage system.
11. The control commissioning method of claim 10, wherein the starting voltage source energy storage system (300) and the current source energy storage system (400) are active loads
The active load is put into the step of forming an off-grid type storage system
Less than or equal to the total capacity of the voltage source energy storage system (300).
12. The control commissioning method of claim 10, wherein the starting voltage source energy storage system (300) and the current source energy storage system (400) are active loads
Inputting, in the step of forming the off-grid type energy storage system, the voltage source type energy storage system (300) outputs active power equal to the input active load
。
13. The control commissioning method according to claim 9, wherein the control breaker K2 is closed and the wind turbine (100) starts to operate; the output power of the energy storage branch is controlled by taking the reactive power of the output end of the energy storage branch as an instruction, the stator voltage of the wind driven generator (100) and the external voltage of the fan start to be synchronous, and a preset grid-connected condition is achieved, and the off-grid wind storage system is formed at the moment and comprises:
controlling a breaker K2 to close to finish the access of the side line of the fan;
measuring the reactive power of the low-voltage side of the box-type transformer T2, and taking the opposite number of the reactive power as a reactive input instruction of the current source type energy storage system (400);
the stator voltage of the wind driven generator (100) and the external voltage of the fan start to be synchronous, and after the preset grid-connected condition is achieved, the circuit breaker K1 is closed, so that the off-grid wind storage system is formed.
14. The control debugging method according to claim 13, wherein the preset grid-connection condition is specifically: the stator voltage of the wind driven generator (100) is completely consistent with the frequency, the phase and the amplitude of the external voltage.
15. The control debugging method according to claim 13, wherein the step of measuring the reactive power at the low-voltage side of the box transformer T2, and taking the opposite number of the reactive power as the reactive input command of the current source energy storage system (400) specifically comprises: measuring the reactive power of the low-voltage side of the box-type transformer T2; and setting the reactive power reference value of the current source type energy storage system (400) as the inverse number of the reactive power of the low-voltage side of the transformer T2 to form closed-loop control.
16. The control debugging method according to claim 9, wherein the step of gradually putting in an active load during the active climbing of the wind turbine specifically comprises:
at the time t1, the power of the wind driven generator (100) begins to climb, and active load is dynamically put into the wind driven generator in a graded manner; at the time of t2, after the output power of the wind driven generator (100) is stabilized, the active power and the reactive power output by the wind driven generator (100) are stabilized to set values respectively; the active load to be input at this time is the same as the set value of the wind turbine generator (100).
17. The control commissioning method according to claim 16, wherein in the step of gradually putting in active load during active wind turbine ramp-up, the reactive power of the current source energy storage system (400) is continuously reduced starting at time t1 until it is completely switched out at time t 2.
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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 |
| AU2023296594A AU2023296594A1 (en) | 2022-06-30 | 2023-08-08 | Control debugging method for off-grid wind storage load power generation system |
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