CN106786796B - Control method and system for wind power to participate in frequency modulation of power system - Google Patents
Control method and system for wind power to participate in frequency modulation of power system Download PDFInfo
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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
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- 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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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
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Abstract
The invention provides a control method and a control system for wind power to participate in frequency modulation of a power system. The control method comprises the step of regulating and controlling the frequency of the power system by utilizing the rotor kinetic energy control and the storage battery energy storage system. The control method of the invention, based on the combined action of the rotor kinetic energy control and the storage battery energy storage system, of the wind power participating in the frequency modulation of the power system, fully utilizes the wind energy, reduces the configuration capacity of the energy storage system and improves the economical efficiency of the wind field operation. The control method and the system thereof can play a good role even under the condition of large load disturbance.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a control method and a control system for wind power to participate in frequency modulation of a power system.
Background
By the end of 2015, the newly added global wind power installed capacity reaches 63.013GW, the total global wind power installed capacity breaks through 430GW, the wind power permeability in the power grid is continuously improved, and a new problem is brought to the frequency regulation of the power system. The wind turbine generator controlled by the frequency converter cannot participate in system frequency adjustment if not additionally controlled; the wind turbine generator generally operates at a Maximum Power Point (MPP), cannot provide active Power for standby, does not have the same frequency modulation capability as a synchronous machine, and cannot ensure safe and stable operation of a system.
At present, a great deal of research is carried out on the control strategy scholars of wind power participating in system frequency modulation. The main control strategies are rotor kinetic energy control and power reserve control. Rotor kinetic energy control supports system frequency by controlling rotor speed, releasing kinetic energy in the rotating rotor. The specific implementation method comprises virtual inertia control, droop control and comprehensive inertia control. And the power standby control enables the wind turbine generator to be in load shedding operation through pitch angle control or overspeed control, and reserves a standby mode for participating in system frequency adjustment. The rotor kinetic energy control response speed is high, but frequency support can be provided only in the dynamic process, the duration is short, sufficient support cannot be provided for large load disturbance, and the secondary reduction of the frequency is easily caused in the recovery process of the rotating speed; the pitch angle control can provide frequency backup once, but the pitch angle needs to be changed frequently, so that the abrasion of a mechanical part is aggravated, and the service life of the fan is shortened; for overspeed control, overspeed control cannot be realized under the condition of high wind speed, and derating operation is contradictory to economy.
Disclosure of Invention
In order to solve the above problems or at least partially solve the above problems, the present invention provides a control method and system for wind power to participate in frequency modulation of an electric power system.
The invention provides a control method for wind power to participate in frequency modulation of a power system.
Preferably, the rotor kinetic energy control and the storage battery energy storage system are connected in parallel at the same bus of the power system to jointly regulate and control the frequency of the power system.
Preferably, the rotor kinetic energy control regulates the frequency of the power system using droop control and virtual inertia control.
Preferably, the specific steps of regulating and controlling the frequency of the power system by adopting droop control and virtual inertia control in the rotor kinetic energy control are as follows:
obtaining Δ P using the droop control based on the system frequency deviation1；
Obtaining delta P by using the virtual inertia control based on the system frequency change rate2；
To obtain an additional active reference signal Δ P of the wind power system, and Δ P ═ Δ P1+ΔP2。
Preferably, the rotor kinetic energy control regulation frequency is 0-delta PmaxThe power system fluctuates within the range, and the regulating and controlling frequency of the storage battery energy storage system is 0-delta PmaxThe power system fluctuating out of range, wherein Δ PmaxIs the maximum value of Δ P.
Preferably, the battery energy storage system is incorporated into the power system by wiring; the battery energy storage system includes: a plurality of storage batteries pass through a storage battery pack, a converter and a transformer which are formed in parallel and/or series connection.
Preferably, the storage battery adopts an internal resistance equivalent model which comprises an ideal voltage source E0And an equivalent internal resistance r, the relationship between which satisfies the following equation:
wherein, V0I is a terminal voltage of the secondary battery, and I is a current value flowing through the secondary battery.
Preferably, the battery energy storage system further comprises a PQ control module, and the specific steps of regulating and controlling the system frequency by using the battery energy storage system are as follows:
and controlling the converter by utilizing a PQ control module based on the voltage, the frequency, the active power and the reactive power at the grid-connected position, and adjusting the frequency of the power system.
Preferably, the specific step of regulating and controlling the frequency of the power system by using the storage battery energy storage system further comprises:
based on the frequency at the grid connection, the frequency is adjusted using a droop control strategy.
Preferably, the storage battery energy storage system further comprises a PI regulator, and the specific steps of regulating and controlling the system frequency by using the storage battery energy storage system are as follows:
the difference value of active power output by a bus at the outlet of the wind power plant and reference active power is processed by a PI regulator to generate a d-axis reference current signal;
generating a q-axis reference current signal by a difference value between voltage output by a bus at an outlet of the wind power plant and reference voltage through a PI regulator;
and controlling the amplitude and the phase of the alternating voltage output by the converter based on the d-axis reference current signal and the q-axis reference current signal, and controlling the active power output by the electric power storage and energy storage system, thereby regulating and controlling the output frequency of the electric power system.
According to another aspect of the invention, a control system for wind power to participate in frequency modulation of a power system is also provided, and comprises a rotor kinetic energy control module and a storage battery energy storage system.
Preferably, the control system further comprises a wind turbine generator, wherein the rotor kinetic energy control module is arranged inside the wind turbine generator; the wind turbine generator and the storage battery energy storage system are respectively connected in parallel at the same bus through a transformer.
Preferably, the control system further comprises a frequency converter control system, and the frequency converter control system is used for outputting active input and output signals controlled by the rotor kinetic energy control module.
Preferably, the battery energy storage system is incorporated into the power system by wiring; the battery energy storage system includes: a plurality of storage batteries pass through a storage battery pack, a converter and a transformer which are formed in parallel and/or series connection.
The control method and the control system for the wind power to participate in the frequency modulation of the power system are based on the combined action of rotor kinetic energy control and the storage battery energy storage system, the capacity of the storage battery energy storage system for rapidly discharging and receiving energy can be utilized, frequency fluctuation is restrained, steady-state frequency deviation of the system is reduced, and dynamic frequency response capacity is improved. The storage battery energy storage system makes up the deficiency of rotor kinetic energy control; meanwhile, the rotor kinetic energy control can fully exert the frequency modulation capability of the fan, fully utilize wind energy, reduce the configuration capacity of an energy storage system and improve the economical efficiency of wind field operation. Even if the wind power permeability of the system is high and the load disturbance is large, the control method can also play a good role and effect and can maintain the frequency stability of the system. The method and the system enhance the inertia of the power system and slow down the frequency fluctuation process caused by the system load disturbance.
Drawings
FIG. 1 is a schematic diagram of rotor kinetic energy control in accordance with a preferred embodiment of the present invention;
FIG. 2 is a diagram of a model of a battery energy storage system in accordance with a preferred embodiment of the present invention;
FIG. 3 is a block diagram of a control framework for a battery energy storage system in accordance with a preferred embodiment of the present invention;
FIG. 4 is a block diagram of the frequency control of the battery energy storage system in accordance with a preferred embodiment of the present invention;
FIG. 5 is a control block diagram of a battery energy storage system in accordance with a preferred embodiment of the present invention;
fig. 6 is a diagram of a simulation system model according to embodiment 1 of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention provides a control method for wind power to participate in frequency modulation of a power system.
The invention innovatively combines rotor kinetic energy control and a storage battery energy storage system to regulate and control the frequency of a power system with wind power participating in frequency modulation, wherein the rotor kinetic energy control can fully utilize the self regulation function of a wind field and ensure the economic operation of the wind field; the storage battery energy storage system has the advantages of high response speed, flexible scale, high energy density, easy maintenance and long service life, can just make up for the defects of a rotor kinetic energy control strategy, and can greatly improve the frequency response characteristic of the system.
In the invention, the rotor kinetic energy control module and the storage battery energy storage system are connected in parallel at the same bus to regulate and control the frequency of the power system together.
In an electric power system with participation of wind power, a wind turbine generator is usually included, a rotor kinetic energy control module is arranged in the wind turbine generator, and the wind turbine generator and a storage battery energy storage system are respectively connected in parallel at the same bus through a transformer to realize common regulation and control of the frequency of the electric power system.
In the invention, the wind turbine is preferably a doubly-fed wind turbine.
The rotor kinetic energy control supports system frequency by controlling the rotor speed and releasing kinetic energy in the rotating rotor, and the specific implementation method comprises virtual inertia control, droop control and comprehensive inertia control. In the present invention, it is preferable to select the integrated inertia control (including droop control and virtual inertia control) to support the system frequency, i.e., to regulate the system frequency.
The power system also comprises a frequency converter control system which is used for outputting active signals after the active signals are controlled by the kinetic energy of the rotor.
When the whole system has external interference, namely when the system frequency is reduced, the rotor kinetic energy control forcibly reduces the rotating speed of a fan rotor in the system participating in wind power, and the kinetic energy of the fan rotor is converted into electric energy for supporting the system frequency; when the system frequency is increased, the rotor kinetic energy is controlled to increase the rotating speed of the fan rotor, and the fan rotor absorbs energy to inhibit the increase of the system frequency.
In order to fully exert the advantages of virtual inertia control and droop control, in a specific embodiment, it is preferable to introduce the system frequency deviation and the frequency change rate into the wind turbine active power control loop of the power system, as shown in fig. 1, that is, the specific steps of regulating and controlling the system frequency by adopting the droop control and the virtual inertia control in the rotor kinetic energy control are as follows: obtaining Δ P using the droop control based on the system frequency deviation1(ii) a Obtaining delta P by using the virtual inertia control based on the system frequency change rate2(ii) a To obtain an additional active reference signal Δ P of the wind power system, and Δ P ═ Δ P1+ΔP2. That is to say that the first and second electrodes,
wherein, K1、K2Respectively a virtual inertia control coefficient and a droop control coefficient,
Δ f is a frequency deviation.
As shown in FIG. 1, f is the system frequency, frIs the reference frequency. The reference frequency refers to a frequency when the system is stably operated without interference, and is generally a rated frequency when the power grid is operated. The system frequency deviation forms delta P through a droop control link1The system frequency change rate forms delta P through a virtual inertia control link2And the sum delta P of the two is an additional active reference signal. Obtaining the maximum active power reference value P at the rotating speed according to the maximum wind power tracking curveMPPT，PMPPTThe power reference value P of the frequency converter control system is formed by the additional active reference signal delta PrefSee fig. 1. The inverter control system in fig. 1 refers to an inverter of the entire power system. When the frequency change of the whole power system is controlled, a frequency converter is arranged in the power system, the rotor kinetic energy control is arranged in a wind turbine generator, the wind turbine generator and a storage battery energy storage system are respectively connected in parallel at the same bus through a transformer, and the frequency converter is arranged at the bus and used for outputting active input and output signals controlled by the rotor kinetic energy.
In one embodiment of the invention, the rotor kinetic energy is controlled to regulate and control the frequency between 0 and delta PmaxThe power system fluctuates in a range, and the regulating frequency of the storage battery is 0-delta PmaxOut-of-range fluctuating power systems. I.e. 0 to delta P for loadmaxWithin the scope, rotor kinetic energy control is used to provide frequency support, thereby modulating power system frequency. When the load exceeds the range, the storage battery energy storage system is used for providing frequency support and regulating and controlling the system frequency. Wherein, Δ PmaxIs the maximum value of Δ P.
The rotor kinetic energy control and the storage battery energy storage system are connected in parallel at the same bus. When the system is in load disturbance, the rotor kinetic energy control acts immediately, and when the rotor kinetic energy control is not enough to support, namelyIn the range of 0 to |. DELTA.PmaxOutside the range, the energy storage system will be active.
The control may be achieved by a dead band setting of the battery energy storage system. When the frequency change is positioned in the dead zone, only the kinetic energy control function of the rotor is realized; when the dead zone is crossed, the kinetic energy of the rotor cannot meet the requirement of system frequency modulation, and the storage battery energy storage system can act at the moment.
In the invention, the storage battery energy storage system can comprise a storage battery pack formed by connecting a plurality of storage batteries in parallel and/or in series, a converter and a transformer. Wherein the battery energy storage system is incorporated into the power system by wiring. The plurality of the present invention means 2 or more than 2.
Wherein, each storage battery can adopt an internal resistance equivalent model which comprises an ideal voltage source E0And an equivalent internal resistance r, the relationship between which satisfies the following equation:
in the above formula, V0I is a terminal voltage of the secondary battery, and I is a current value flowing through the secondary battery.
The simplified storage batteries are connected in parallel and series to form a storage battery pack, and then are sequentially connected into a power system through a converter, a transformer and a circuit to form a storage battery energy storage system, as shown in fig. 2.
In the invention, in order to more fully play the role of the wind turbine generator, the storage battery energy storage system can also comprise a PQ control module, and the converter in the storage battery energy storage system can be controlled by utilizing the PQ control module based on the voltage, the frequency, the active power and the reactive power at the grid-connected position, so that the frequency of the power system is adjusted.
As shown in fig. 3, the voltage, the frequency, the active power and the reactive power of the grid-connected part of the storage battery energy storage system measured by the measuring device are all controlled by the converter of the storage battery current energy storage system through the PQ control module, so as to participate in the frequency regulation of the system.
In order to respond more quicklyFor the measured frequency at the grid-connected position, a droop control strategy can be used, the strategy simulates a power-frequency static characteristic curve of primary frequency modulation of the synchronous generator, and the actual frequency f of the system and the reference frequency f are adjusted0(the reference frequency is the frequency value when the power system normally operates) the deviation df forms an active reference signal f of the storage battery energy storage system through the dead zonedeadIs multiplied by a work-frequency coefficient
Obtaining an active reference value P of the storage battery energy storage systemrefEven if the storage battery energy storage system can make corresponding adjustment according to the frequency change of the system, the system frequency is supported, as shown in fig. 4.
When the frequency of the power system changes, the active reference value of the energy storage system changes correspondingly, and after the frequency is controlled by the converter, the energy storage system outputs or absorbs active power correspondingly to support the frequency of the system.
In the embodiment, the converter takes the active power and the voltage output by the bus at the outlet of the storage battery energy storage system as control signals, and the control signals for controlling active power decoupling control and reactive power decoupling control of the wind power plant are formed after the control signals are compared with reference values, as shown in fig. 5. Wherein P isin、VinRespectively the active power and voltage, P, output by the bus at the outlet of the wind farm (i.e. at the outlet of the storage battery energy storage system)ref、VrefThe active power reference signal and the voltage reference signal are obtained, namely the power value and the voltage value of the grid-connected bus before the load disturbance occurs. PinAnd a reference active power PrefThe difference dp of (d) is passed through an inertia link
Then the d-axis reference current signal I is generated by a PI regulatord_ref(ii) a Actual voltage VinAnd a reference voltage VrefVoltage deviation dv of
Death and harmfulnessThe region, while passing through the integration segment
Acting together to generate a q-axis reference current signal Iq_refAnd then the amplitude and the phase of the alternating voltage output by the converter are controlled, so that the active power output by the energy storage system is controlled.
Based on the method, the embodiment of the invention also provides a control system for wind power to participate in frequency modulation of the power system, and the system comprises a rotor kinetic energy control module and a storage battery energy storage system.
The system comprises a wind turbine generator, wherein the rotor kinetic energy control module is arranged in a fan; the wind turbine generator and the storage battery energy storage system are respectively connected in parallel at the same bus through a transformer.
The control system further comprises a frequency converter control system, and the frequency converter control system is used for outputting active input and output signals controlled by the rotor kinetic energy control module.
The storage battery energy storage system further comprises a dead zone, and when the change value of the system frequency is located in the dead zone, the rotor kinetic energy controls and regulates the frequency of the power system; when the change value of the system frequency crosses the dead zone, the storage battery energy storage system regulates and controls the power system frequency.
The storage battery energy storage system comprises a storage battery pack, a converter and a transformer, wherein the storage battery pack is formed by connecting a plurality of storage batteries in parallel and/or in series; the battery energy storage system is incorporated into the power system through wiring.
The storage battery pack, the converter and the transformer can be sequentially combined into a power system to form the storage battery energy storage system.
The single storage battery is preferably a storage battery adopting an internal resistance equivalent model.
The storage battery energy storage system also comprises a voltage measuring module, a frequency measuring module, a PQ measuring module and a PQ control module. The power grid-connected frequency regulation system comprises a voltage measurement module, a frequency measurement module, a PQ control module and a converter, wherein the voltage measurement module is used for measuring voltage at a grid-connected position, the frequency measurement module is used for measuring frequency at the grid-connected position, the PQ measurement module is used for measuring active power at the grid-connected position and reactive power at the grid-connected position, and the PQ control module is used for controlling the converter according to the voltage, the frequency, the active power and the reactive power so as to.
A frequency control module is also included in the battery energy storage system for adjusting the frequency using a droop control strategy.
The storage battery energy storage system also comprises a PI regulator which is used for generating a d-axis reference current signal according to the difference value of the active power output by the bus at the outlet of the wind power plant and the reference active power and generating a q-axis reference current signal according to the difference value of the voltage output by the bus at the outlet of the wind power plant and the reference voltage.
Example 1
The simulation study used a classical 4 machine 2 zone system as shown in figure 6. The system comprises 11 nodes, and a wind field with rotor kinetic energy control and a storage battery energy storage system are respectively merged into B through a transformer2On the bus, the configuration capacity of the storage battery energy storage system is 30MVA, the wind field is 200MW (2MW × 100), and the wind speed is constant 8 m/s.G1、G2、G3All 800MW and equipped with speed regulators and power system stabilizers system load L1，L2The sizes are 1600MW, 900MW and L respectively0To disturb the load. The whole simulation process lasts for 15s, and the system load is disturbed at the moment of 5 s. The simulation compares the frequency response characteristics of the non-frequency control, the rotor kinetic energy control, the storage battery energy storage system and the combined control of the non-frequency control, the rotor kinetic energy control and the storage battery energy storage system.
At the moment of 5s, 5% of disturbance of the system load occurs, the frequency of the system is reduced, and the system is stabilized again after a period of time. Taking 5% load disturbance as an example, the maximum frequency deviation of the system is 0.17062Hz under the non-control action, and after the rotor is subjected to dynamic control, the maximum frequency deviation is 0.15900Hz, so that 0.01162Hz is improved; under the action of a storage battery energy storage system, the maximum frequency deviation is 0.12691Hz, and 0.04371Hz is increased; under the combined action of the two control modes, the maximum frequency deviation is 0.11778Hz, and the frequency deviation is improved by 0.05284 Hz. The effectiveness of the control strategy of the rotor kinetic energy control combined energy storage system is demonstrated, and meanwhile, the combined control is proved to be capable of further improving the lowest point frequency, reducing the maximum frequency deviation and improving the frequency stability. In summary, the dynamic response characteristic of the system frequency during load disturbance can be improved by combining the rotor kinetic energy control and the storage battery energy storage system. The effect of the combination of the two is obviously better than the independent action of the storage battery energy storage system and the independent action of the rotor kinetic energy control.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A control method for wind power to participate in frequency modulation of a power system is characterized by comprising the following steps: the frequency of the power system is regulated and controlled by utilizing rotor kinetic energy control and a storage battery energy storage system;
the rotor kinetic energy control adopts droop control and virtual inertia control to regulate and control the frequency of the power system;
the rotor kinetic energy control adopts droop control and virtual inertia control to regulate and control the frequency of the power system, and comprises the following specific steps:
obtaining Δ P using the droop control based on the system frequency deviation1；
Obtaining delta P by using the virtual inertia control based on the system frequency change rate2；
To obtain an additional active reference signal Δ P of the wind power system, and Δ P ═ Δ P1+ΔP2；
The rotor kinetic energy control and the storage battery energy storage system are connected in parallel at the same bus;
the storage battery energy storage system further comprises a PI regulator, and the specific steps of regulating and controlling the system frequency by using the storage battery energy storage system are as follows:
the difference value of active power output by a bus at the outlet of the wind power plant and reference active power is processed by a PI regulator to generate a d-axis reference current signal; the reference active power forms a reference frequency signal of the storage battery energy storage system by passing the deviation of the actual frequency and the reference frequency of the storage battery energy storage system through a dead zone, and then is multiplied by a power-frequency coefficient
Obtaining a reference active power;
generating a q-axis reference current signal by a difference value between voltage output by a bus at an outlet of the wind power plant and reference voltage through a PI regulator; the q-axis reference current signal is subjected to inertia link through a difference value of active power output by a bus at an outlet of the wind power plant and reference active power, then is subjected to the PI regulator to generate a d-axis reference current signal, and the q-axis reference current is generated through combined action of voltage deviation between voltage output by the bus at the outlet of the wind power plant and reference voltage through the inertia link and a dead zone and through an integral link;
and controlling the amplitude and the phase of the alternating voltage output by the converter based on the d-axis reference current signal and the q-axis reference current signal, and controlling the active power output by the storage battery energy storage system, thereby regulating and controlling the output frequency of the power system.
2. The control method according to claim 1, wherein the rotor kinetic energy control regulation frequency is 0- Δ PmaxThe power system fluctuates within the range, and the regulating and controlling frequency of the storage battery energy storage system is 0-delta PmaxThe power system fluctuating out of range, wherein Δ PmaxIs the maximum value of Δ P.
3. The control method according to claim 1 or 2, characterized in that the battery energy storage system is incorporated into the power system by wiring; the battery energy storage system includes: a plurality of storage batteries pass through a storage battery pack, a converter and a transformer which are formed in parallel and/or series connection.
4. A control method according to claim 3, characterized in that the accumulator uses an internal resistance equivalent model comprising an ideal voltage source E0And an equivalent internal resistance r, the relationship between which satisfies the following equation:
wherein, V0I is a terminal voltage of the secondary battery, and I is a current value flowing through the secondary battery.
5. The control method according to claim 3, wherein the battery energy storage system further comprises a PQ control module, and the specific steps of regulating and controlling the system frequency by using the battery energy storage system are as follows:
and controlling the converter by utilizing a PQ control module based on the voltage, the frequency, the active power and the reactive power at the grid-connected position, and adjusting the frequency of the power system.
6. A control system for wind power to participate in frequency modulation of a power system is characterized by comprising a rotor kinetic energy control module and a storage battery energy storage system;
the rotor kinetic energy control adopts droop control and virtual inertia control to regulate and control the frequency of the power system;
the rotor kinetic energy control adopts droop control and virtual inertia control to regulate and control the frequency of the power system, and comprises the following specific steps:
obtaining Δ P using the droop control based on the system frequency deviation1；
Obtaining delta P by using the virtual inertia control based on the system frequency change rate2；
To obtain an additional active reference signal Δ P of the wind power system, and Δ P ═ Δ P1+ΔP2；
The rotor kinetic energy control and the storage battery energy storage system are connected in parallel at the same bus;
the storage battery energy storage system further comprises a PI regulator, and the specific steps of regulating and controlling the system frequency by using the storage battery energy storage system are as follows:
the difference value of active power output by a bus at the outlet of the wind power plant and reference active power is processed by a PI regulator to generate a d-axis reference current signal; the reference active power forms a reference frequency signal of the storage battery energy storage system by passing the deviation of the actual frequency and the reference frequency of the storage battery energy storage system through a dead zone, and then is multiplied by a power-frequency coefficient
Obtaining a reference active power;
generating a q-axis reference current signal by a difference value between voltage output by a bus at an outlet of the wind power plant and reference voltage through a PI regulator; the q-axis reference current signal is subjected to inertia link through a difference value of active power output by a bus at an outlet of the wind power plant and reference active power, then is subjected to the PI regulator to generate a d-axis reference current signal, and the q-axis reference current is generated through combined action of voltage deviation between voltage output by the bus at the outlet of the wind power plant and reference voltage through the inertia link and a dead zone and through an integral link;
and controlling the amplitude and the phase of the alternating voltage output by the converter based on the d-axis reference current signal and the q-axis reference current signal, and controlling the active power output by the storage battery energy storage system, thereby regulating and controlling the output frequency of the power system.
7. The control system of claim 6, further comprising a wind turbine, wherein,
the rotor kinetic energy control module is arranged in the wind turbine generator;
the wind turbine generator and the storage battery energy storage system are respectively connected in parallel at the same bus through a transformer.
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