CN108599232A - A kind of the wind-light storage energy exchange control method and system of virtual synchronous generator - Google Patents

Abstract

A wind-solar-storage energy exchange control method and system for a virtual synchronous generator, including: determining the deviation power according to the grid dispatching demand and the power output of the distributed system; supplementing the deviation power based on the control strategy of the energy switch; wherein the energy switch The control strategy includes: distributed system and centralized energy storage system control strategy. The technical solution proposed by the invention has strong practicability, can be used in micro-grid systems with different distributed energy combinations, improves the stability of power system operation, and realizes active support for large power grids.

Description

A wind-solar-storage energy exchange control method and system for a virtual synchronous generator

technical field

The invention belongs to the technical field of grid-connected distributed power generation, and in particular relates to a wind-solar-storage-storage energy exchange control method and system for a virtual synchronous generator.

Background technique

At present, the global energy crisis is intensifying and the problem of climate warming is becoming more and more prominent. Under this background, the power generation technology including distributed energy has been developed rapidly. Load and grid dispatching requirements. But at the same time, there are many grid-connected inverters in the distributed generation system, which brings great challenges to the safe and stable operation of the distribution network. Considering the randomness, intermittentness, and low dispatchability of distributed energy in the microgrid system, when they are integrated into the entire microgrid system through inverters, there will be large fluctuations in voltage or frequency. Considering that the grid-connected inverter of distributed energy and the synchronous generator have the same external characteristics, the electromagnetic and mechanical equations of the synchronous generator are used to control the grid-connected inverter, so that the distributed generation system changes from the passive regulation of the original grid to the synchronous generator. For active power regulation, the "virtual synchronous generator" technology came into being. The virtual synchronous generator is based on the fact that the synchronous generator in the large power grid has excellent inertia and damping characteristics, and can participate in the regulation of the grid voltage and frequency. The advantage of being naturally friendly to the grid. Based on this idea, a proper amount of energy storage unit is introduced into the DC side of the traditional grid-connected inverter, and the traditional synchronous generator model is integrated in the control of the inverter, leading to the virtual synchronous generator technology. However, how to realize the energy exchange control between the distributed energy source and the energy storage device, so that the distributed energy source can meet the stable and reliable operation of the entire microgrid system, is a technical problem to be solved in this field.

Contents of the invention

In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a wind-solar-storage energy exchange control method and system for a virtual synchronous generator.

The technical scheme provided by the invention is:

A method for controlling wind-solar-storage energy exchange of a virtual synchronous generator, comprising:

Determine the deviation power according to the grid dispatching demand and the power output of the distributed system;

A control strategy based on an energy exchange supplements the bias power;

The control strategies of the energy exchange include: distributed system and centralized energy storage system control strategies.

Preferably, the calculation of the deviation power is as follows:

In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output, P ₀ is the grid dispatching demand reference value; P _{j_i} is the mechanical power of the virtual synchronous generator; P _load is the local load of the microgrid system; i is the number of virtual synchronous generators.

Preferably, the energy switch-based control strategy supplements the bias power; including:

Based on the working status of the distributed power generation system, the energy switch selects the power supply of the centralized energy storage system or the distributed hierarchical control strategy to supplement the power demanded by the grid;

When the distributed power generation system is at the maximum power output, the energy switch selects the centralized energy storage system for scheduling;

Otherwise, the energy exchange is selected to be dispatched by a distributed system or a combination of a distributed system and an energy storage system connected in parallel with the distributed system.

Preferably, when the distributed power generation system is at the maximum power output, the energy switch selects the centralized energy storage system for scheduling, including:

The energy switch performs power distribution according to the following formula:

In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output; P _{str_i} is the power output of the energy storage system; n is the number of energy storage systems; f _{x_i} is the condition function for calling the energy storage system.

Preferably, the energy exchange is selected to be scheduled by a distributed system or a distributed system plus an energy storage system connected in parallel with the distributed system, including:

The energy switch performs power distribution according to the following formula:

In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output; P _{str_i} is the power output of the energy storage system; n is the number of energy storage systems; f _{x_i} is the condition function for calling the energy storage system; P _{eng_k} is the power output of distributed energy; m is the number of distributed energy; P _{str_i} is the power output of the energy storage system; f _{y_k} is the condition function for calling the photovoltaic/wind power generation system.

Preferably, the distributed system includes: a wind storage system and a light storage system.

Another purpose of the present invention is to propose a wind-solar-storage energy exchange control system for a virtual synchronous generator, including: a deviation determination module and an analysis and processing module;

The deviation determination module is used to determine the deviation power according to the grid dispatching demand and the power output of the distributed system;

The analysis and processing module is configured to supplement the deviation power based on the control strategy of the energy switch including the distributed system and the centralized energy storage system, wherein the control strategy of the energy switch includes: the control strategy of the distributed system and the centralized energy storage system.

Preferably, the deviation determination module includes: a calculation submodule;

The calculation submodule is used to calculate the deviation power according to the following formula:

In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output, P ₀ is the grid dispatching demand reference value; P _{j_i} is the mechanical power of the virtual synchronous generator; P _load is the local load of the microgrid system; i is the number of virtual synchronous generators.

Preferably, the analysis and processing module includes: an analysis submodule and a processing submodule;

The analysis sub-module is used for the energy switch to select the power supply of the centralized energy storage system or the distributed hierarchical control strategy to supplement the required power of the grid based on the working state of the distributed power generation system;

The processing sub-module is used to select the centralized energy storage system for scheduling by the energy switch when the distributed power generation system is at the maximum power output;

Otherwise, the energy exchange is selected to be dispatched by a distributed system or a combination of a distributed system and an energy storage system connected in parallel with the distributed system.

Preferably, the processing submodule includes: a centralized scheduling unit;

The centralized scheduling unit is used to select the centralized energy storage system for scheduling by the energy switch when the distributed power generation system is at the maximum power output, and perform power distribution according to the following formula,

In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output; P _{str_i} is the power output of the energy storage system; n is the number of energy storage systems; f _{x_i} is the condition function for calling the energy storage system.

Preferably, the processing submodule further includes: a distributed scheduling unit;

The distributed scheduling unit is used for the energy switch to select a distributed system or a distributed system plus an energy storage system connected in parallel with the distributed system for scheduling, and perform power distribution according to the following formula:

In the formula, P _{eng_k} is the power output of distributed energy sources; m is the number of distributed energy sources; f _{y_k} is the condition function for calling the photovoltaic/wind power generation system. Preferably, the distributed system includes: a wind storage system and a light storage system.

Compared with prior art, the beneficial effect of the present invention is:

The technical solution proposed by the present invention determines the deviation power according to the power grid dispatching requirements and the power output of the distributed system; supplements the deviation power based on the control strategy of the energy switch; the control strategy of the energy switch includes: distributed system and centralized energy storage System control strategy. When considering the energy exchange between distributed energy sources and the entire micro-grid system, a centralized-distributed multi-layer energy exchange control strategy is adopted to realize seamless switching between different distributed energy sources and the entire micro-grid system. Stable operation and seamless switching of grid-connected/islanded operation modes of the microgrid system.

In the process of multi-layer energy exchange, the technical solution proposed by the present invention is based on the centralized-distributed energy exchange control of the multi-layer energy storage system, and the energy storage elements on the side of the energy exchange network effectively simulate the rotation of the "synchronous generator". Inertia, the entire energy exchange can simulate the synchronous generator output to support the grid frequency when the grid frequency decreases. When the grid frequency is too high, the simulated synchronous generator stores energy in different energy storage systems.

The energy exchange control method in the technical solution proposed by the present invention has strong practicability, and can be used in micro-grid systems with different distributed energy combinations to improve the stability of power system operation and realize active support for large power grids.

Description of drawings

Fig. 1 is a control block diagram of a wind/light/storage distributed energy inverter based on the present invention;

Fig. 2 is the energy exchange control block diagram of the present invention;

Fig. 3 is a simplified equivalent model of the energy exchange control block diagram of the present invention.

Detailed ways

In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.

According to the characteristics of distributed energy grid-connected, a wind-solar-storage energy exchange control method based on a virtual synchronous generator is proposed: the output of photovoltaic/wind power generation in the two systems of wind-storage and solar-storage systems is connected in parallel with energy storage devices and inverters , the inverter device is connected to the microgrid through a "virtual synchronous generator". When considering the energy exchange between distributed energy and the entire microgrid system, a centralized-distributed hierarchical energy exchange control strategy is adopted. The lower layer control method mainly considers optical storage Separate energy exchange control mode for wind/wind storage; the upper control mode mainly considers the energy exchange between the centralized energy storage device and the lower solar/wind storage, so as to realize the seamless switching of different distributed energy sources to the main inverter in different operating modes, and Accurately and quickly meet the dispatching needs of the microgrid system and power grid.

A method for controlling wind-solar-storage energy exchange of a virtual synchronous generator, comprising:

Determine the deviation power according to the grid dispatching demand and the power output of the distributed system;

A control strategy based on an energy exchange supplements the bias power;

The control strategies of the energy exchange include: distributed system and centralized energy storage system control strategies.

Specifically, a control method for wind-solar-storage-storage energy exchange based on a virtual synchronous generator, the inverter control of the microgrid system is shown in Figure 1. Its steps are as follows:

In the first step, the present invention takes the direct drive permanent magnet wind turbine as an example. In order to realize the output voltage stability of the wind power generation system and the decoupling control of active power and reactive power, the grid-side converter adopts a directional voltage vector for the rotor magnetic field. control strategy, the obtained steady-state voltage equation is

Among them, k _p is the fixed resistance value of the dq axis; _idref is the d-axis component of the grid-side converter output reference current; i _qref is the q-axis component of the grid-side converter output reference current; id, iq are the grid-side converter dq-axis component of the current output by the converter; ud, uq are the dq-axis components of the voltage output by the grid-side converter; ω is the synchronous speed; _{u g} is the grid voltage; The inductance value of the line reactor; R is the line resistance value of the three-phase line reactor.

The active power P _g and reactive power Q _g output by the grid-side converter are respectively

Among them, u _gd is the d-axis component of the output power to the grid; u _gq is the q-axis component of the output power to the grid.

When controlling the grid-side converter of the wind power generation system, the actual value of active power and reactive power is compared with the reference value, and the difference signal is sent to the PI control unit to calculate the component of the current on the d-q axis, and The current value is sent to the PI control unit to obtain the modulated voltage value.

In the second step, calculate the output current i _pv of the photovoltaic cell as

Among them, K _I is the Boltzmann constant; I _scr is the short-circuit current value of the photovoltaic cell under ideal conditions; T is the ambient temperature value; S _r is the number of photovoltaic panels; I _rs is the reverse saturation current of the diode; The amount of charge; U _dc is the output voltage value; A is the polarity factor of the pole tube.

Photovoltaics adopts the maximum power tracking control method, real-time sampling output voltage and current sampling to obtain the output power value P _pv of photovoltaic cells is

P _pv = U _dc i _pv (4)

Sample the photovoltaic output at the same time interval, and calculate the difference ΔP _pv of the battery output power of the difference Δt between two time nodes. If ΔP _pv >0, change the power output according to the power output trend (the direction of power increase) at this time; if ΔP _pv <0, power output in the opposite direction (the direction of power increase) at this time.

In the third step, in order to maintain the stable output of the voltage and power of the wind power generation system and photovoltaic system, it is necessary to incorporate energy storage batteries into the distributed energy system. The real-time state of charge SOC of the energy storage batteries is

Among them, SOC ₀ is the state of charge at the starting point; _ib is the charging current of the energy storage battery; E is the total capacity of the battery.

The output voltage value U _b of the energy storage battery is

Among them, A is the amplitude within the range of the voltage output index; T ₀ is the time constant; U ₀ is the opening voltage value; R _b is the internal resistance; K is the capacity coefficient.

In the fourth step, the inverter connected to distributed energy sources is regarded as a virtual synchronous generator, and the mechanical motion equation of the virtual synchronous generator is proposed as

Among them, ω _i is the electrical angular velocity; J _i is the moment of inertia; P _{j_i} is the mechanical power; P _{c_i} is the electromagnetic power; D _i is the damping coefficient. i is a different inverter, i=1 is a photovoltaic inverter; i=2 is an inverter of a wind power generation system.

in, is the three-phase potential of the synchronous generator; is the three-phase current of the synchronous generator.

The fifth step is to adjust the virtual mechanical power P _{j_i} of the virtual synchronous generator, obtain the active power command P _{ref_i} according to the grid-connected inverter, and then calculate the frequency deviation to obtain the feedback command ΔP _{f_i} = P _{ref_i} -P _{j_i} , the power deviation command is given by The energy storage device is input into the inverter through a bidirectional DC/DC converter to compensate for power deviation.

If the frequency deviation satisfies

ΔP _{f_i} = k _{f_i} f ₀ -k _{f_i} f _i (9)

Among them, k _{f_i} is the active power adjustment coefficient of different virtual synchronous generators; f ₀ is the rated frequency of distribution network; f _i is the port frequency of virtual synchronous generators.

Then sort out the mechanical power of the virtual synchronous generator as

P _{j_i} ＝P _{ref_i} -(k _{f_i} f ₀ -k _{f_i} f _i ) (10)

The sixth step is to adjust the virtual potential e of the virtual synchronous generator to realize the machine terminal voltage and reactive power value. The expression of the virtual potential e _i is

e _i ＝e _{0_i} +Δe _{U_i} +Δe _{Q_i} ＝e _{0_i} +k _{U_i} (u _{refs_i} -u _{s_i} )+k _{Q_i} (u _{refQ_i} -u _{Q_i} )

(11)

Among them, e _{0_i} is the no-load potential energy of the virtual synchronous generator; Δe _{U_i} is the potential energy output by the virtual synchronous generator voltage or excitation regulation; Δe _{Q_i} is the reactive power value corresponding to the regulation of the virtual synchronous generator; k _{U_i} is the regulation Voltage difference coefficient; k _{Q_i} is the adjusted reactive power difference coefficient; u _{refs_i} is the reference value of the inverter output voltage; u _{s_i} is the actual value of the inverter output voltage; u _{refQ_i} is the reference value of the inverter output power; u _{Q_i} is the actual value of the inverter output voltage.

The seventh step is to determine the power output value of the entire distributed system according to the grid dispatching center, and calculate the deviation ΔP _{p_i} between the grid demand reference value and the actual power output at a fixed time Δt. And through the integrated scheduling of energy switches to meet the needs of the grid.

Among them, P ₀ is the power demand of the grid. When P ₀ >0, it means output power to the grid. When P ₀ <0, it means that the microgrid needs the power supplied by the grid; P _{j_i} is the mechanical power of the virtual synchronous generator; P _load is the microgrid The local load of the system; i is the number of virtual synchronous generators.

There are two virtual synchronous generators connected to the photovoltaic system and the wind power generation system. As shown in Figure 2-3, the two virtual synchronous generators and a centralized energy storage system together constitute an energy exchange to ensure that the distributed power output can meet While meeting the needs of the microgrid, it ensures the transmission of power to the large grid.

In the eighth step, according to the demand of the power grid, the energy exchange supplements the required power ΔP _{p_i} of the power grid by considering the centralized-distributed hierarchical control strategy of the distributed actual operation situation.

1) If the photovoltaic power generation system is already working in the maximum power tracking state P _{MPPT_i} and the wind turbine is already working at the rated power output, the energy exchange system needs to schedule the energy storage device to meet the grid scheduling requirements.

Calculate the basic characteristics of the operation of each energy storage system for power output allocation.

Among them, P _{str_i} is the power output of the energy storage system; n is the number of energy storage systems; f _{x_i} is the condition function for calling the energy storage system, including the state of charge, real-time power, the upper and lower limits of the power and capacity of the energy storage unit, etc., considering Line loss, etc., generally adopt the upper-level scheduling strategy and consider the centralized energy storage system as the priority scheduling object.

2) If the distributed energy source does not meet the maximum power output at this time, the energy exchange system needs to consider the underlying scheduling strategy, and schedule the distributed energy source or the combination of distributed energy source and energy storage to meet the grid dispatching requirements.

Calculate the basic characteristics of the operation of each energy storage system for power output allocation.

Among them, P _{eng_k} is the power output of distributed energy sources; m is the number of distributed energy sources; f _{y_k} is the condition function for calling the photovoltaic/wind power generation system, including the real-time power output value of the virtual synchronous generator of the photovoltaic/wind power generation system.

Another purpose of the present invention is to propose a wind-solar energy-storage exchange control system for a virtual synchronous generator. This system has the same principle as the wind-solar energy-storage exchange control method for a virtual synchronous generator. The system will be further described below:

The system includes: a deviation determination module and an analysis and processing module;

A deviation determination module, configured to determine the deviation power according to the grid dispatching demand and the power output of the distributed system;

The analysis and processing module is used to supplement the bias power based on the control strategy of the energy switch including the distributed system and the centralized energy storage system, wherein the control strategy of the energy switch includes: the control strategy of the distributed system and the centralized energy storage system.

Deviation determination module, including: calculation sub-module;

The calculation sub-module is used to calculate the deviation power according to the following formula:

In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output, P ₀ is the grid demand reference value; P _{j_i} is the mechanical power of the virtual synchronous generator; P _load is the local load of the microgrid system; i is Number of virtual synchronous generators.

Analysis and processing module, including: analysis sub-module and processing sub-module;

The analysis sub-module is used for the energy switch to select the power supply of the centralized energy storage system or the distributed hierarchical control strategy based on the working status of the distributed power generation system to supplement the required power of the grid;

The processing sub-module is used to select the centralized energy storage system for dispatching by the energy switch when the distributed power generation system is at the maximum power output;

Otherwise, the energy exchange is selected to be dispatched by a distributed system or a combination of a distributed system and an energy storage system connected in parallel with the distributed system.

Processing sub-modules, including: centralized scheduling unit;

The centralized scheduling unit is used to select the centralized energy storage system for scheduling by the energy switch when the distributed power generation system is at the maximum power output, and perform power distribution according to the following formula,

In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output; P _{str_i} is the power output of the energy storage system; n is the number of energy storage systems; f _{x_i} is the condition function for calling the energy storage system.

The processing sub-module also includes: a distributed scheduling unit;

The distributed scheduling unit is used for the energy switch to select a distributed system or a distributed system plus an energy storage system connected in parallel with the distributed system for scheduling, and perform power distribution according to the following formula:

In the formula, P _{eng_k} is the power output of distributed energy sources; m is the number of distributed energy sources; f _{y_k} is the condition function for calling the photovoltaic/wind power generation system. Distributed systems, including: wind storage system and solar storage system.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application 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, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

The above are only embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the pending application of the present invention. within the scope of the claims.

Claims (10)

1. A wind-solar-storage storage energy exchange control method for a virtual synchronous generator, characterized in that it comprises: Determine the deviation power according to the grid dispatching demand and the power output of the distributed system; A control strategy based on an energy exchange supplements the bias power; The control strategies of the energy exchange include: distributed system and centralized energy storage system control strategies. 2. The wind-solar-storage-storage energy exchange control method of a virtual synchronous generator according to claim 1, wherein the calculation of the deviation power is as follows: In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output, P ₀ is the grid dispatching demand reference value; P _{j_i} is the mechanical power of the virtual synchronous generator; P _load is the local load of the microgrid system; i is the number of virtual synchronous generators. 3. The wind-solar-storage-storage energy exchange control method of a virtual synchronous generator according to claim 1, wherein the energy switch-based control strategy supplements the bias power; comprising: Based on the working status of the distributed power generation system, the energy switch selects the power supply of the centralized energy storage system or the distributed hierarchical control strategy to supplement the power demanded by the grid; When the distributed power generation system is at the maximum power output, the energy switch selects the centralized energy storage system for scheduling; otherwise, the energy switch selects the distributed system or the combination of the distributed system and the energy storage system connected in parallel with the distributed system for scheduling . 4. The wind-solar-storage-storage energy exchange control method of a virtual synchronous generator according to claim 3, wherein when the distributed power generation system is at maximum power output, the energy switch selects the centralized energy storage system for scheduling, include: The energy switch performs power distribution according to the following formula: In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output; P _{str_i} is the power output of the energy storage system; n is the number of energy storage systems; f _{x_i} is the condition function for calling the energy storage system. 5. The wind-solar-storage energy exchange control method of a virtual synchronous generator according to claim 3, wherein the energy switch is selected to be combined with a distributed system or a distributed system plus an energy storage system connected in parallel with the distributed system Make a schedule, including: The energy switch performs power distribution according to the following formula: In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output; P _{str_i} is the power output of the energy storage system; n is the number of energy storage systems; f _{x_i} is the condition function for calling the energy storage system; P _{eng_k} is the power output of distributed energy; m is the number of distributed energy; P _{str_i} is the power output of the energy storage system; f _{y_k} is the condition function for calling the photovoltaic/wind power generation system. 6. A wind-solar-storage energy exchange control system for a virtual synchronous generator, characterized in that it includes: a deviation determination module and an analysis and processing module; The deviation determination module is used to determine the deviation power according to the grid dispatching demand and the power output of the distributed system; The analysis and processing module is configured to supplement the deviation power based on the control strategy of the energy switch including the distributed system and the centralized energy storage system, wherein the control strategy of the energy switch includes: the control strategy of the distributed system and the centralized energy storage system. 7. The wind-solar-storage energy exchange control system of a virtual synchronous generator according to claim 6, wherein the deviation determination module includes: a calculation sub-module; The calculation submodule is used to calculate the deviation power according to the following formula: In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output, P ₀ is the grid dispatching demand reference value; P _{j_i} is the mechanical power of the virtual synchronous generator; P _load is the local load of the microgrid system; i is the number of virtual synchronous generators. 8. The wind-solar-storage energy exchange control system of a virtual synchronous generator according to claim 6, wherein the analysis and processing module includes: an analysis sub-module and a processing sub-module; The analysis sub-module is used for the energy switch to select the power supply of the centralized energy storage system or the distributed hierarchical control strategy to supplement the required power of the grid based on the working state of the distributed power generation system; The processing sub-module is used to select the centralized energy storage system for scheduling by the energy switch when the distributed power generation system is at the maximum power output; Otherwise, the energy exchange is selected to be dispatched by a distributed system or a combination of a distributed system and an energy storage system connected in parallel with the distributed system. 9. The wind-solar-storage-storage energy exchange control system of a virtual synchronous generator according to claim 8, wherein the processing sub-module includes: a centralized scheduling unit; The centralized scheduling unit is used to select the centralized energy storage system for scheduling by the energy switch when the distributed power generation system is at the maximum power output, and perform power distribution according to the following formula: In the formula, ΔP _{p_i} is the deviation power, which is the deviation between the grid demand reference value and the actual power output; P _{str_i} is the power output of the energy storage system; n is the number of energy storage systems; f _{x_i} is the condition function for calling the energy storage system. 10. The wind-solar-storage-storage energy exchange control system of a virtual synchronous generator according to claim 9, wherein the processing sub-module further comprises: a distributed scheduling unit; The distributed scheduling unit is used for the energy switch to select a distributed system or a distributed system plus an energy storage system connected in parallel with the distributed system for scheduling, and perform power distribution according to the following formula: In the formula, P _{eng_k} is the power output of distributed energy sources; m is the number of distributed energy sources; f _{y_k} is the condition function for calling the photovoltaic/wind power generation system.