Simulation test system and method for active support working condition of high-voltage cascade energy storage module

Abstract

The application provides a simulation test system and method for high-voltage cascade energy storage module active support working conditions, which acts on a test circuit composed of a current generator, a filter and an energy storage module / module group, and the test system comprises a power grid-energy storage system virtual equivalent model, a current controller and an energy storage module / module group controller; the equivalent model is used to generate current reference signals, modulation voltage reference signals and state of charge reference signals corresponding to high-voltage cascade energy storage active support working conditions, and send the signals to the current controller and the energy storage module / module group controller to simulate the interaction characteristics of the power grid and the energy storage system. The application simulates the interaction characteristics of the power grid and the energy storage system by using the power grid-energy storage virtual equivalent model, and can realize the simulation of high-voltage cascade energy storage active support working conditions under various power grid parameters and energy storage control conditions without building a complete energy storage system, so that the test of a single or a small number of energy storage modules can be realized, the test flexibility and accuracy are high, and the test cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a simulation test system and method for active support working condition of high-voltage cascaded energy storage module. BACKGROUND

[0002] With the increasing prominence of the "double high" characteristics of China's new power system, new energy power generation is gradually replacing conventional synchronous machines and will become the main power source, making the system frequency regulation capacity and voltage support capacity significantly decreased. Therefore, the high-voltage cascaded energy storage system needs to have active support capability, but while the energy storage system is executing the active support function, the internal energy storage module will be subjected to the influence of power grid transient and energy storage system control, which is easy to cause component over-stress failure. The existing test method needs to build a relatively complete energy storage system for testing, which is high in cost and low in efficiency, or can only test a small number of energy storage modules under simple constant working conditions, lacking a flexible method for creating test working conditions. Therefore, how to design an energy storage module simulation test method for high-voltage cascaded energy storage active support working condition to efficiently and accurately test a small number of energy storage modules has become a problem to be solved.

[0003] Therefore, a simulation test method for a small number of energy storage modules is needed to accurately simulate the running working condition of the energy storage module when it is actively supported in the actual high-voltage cascaded energy storage system, and to improve the test accuracy and test flexibility. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a simulation test system and method for active support working condition of high-voltage cascaded energy storage module.

[0005] According to one aspect of the present application, a simulation test system for active support working condition of high-voltage cascaded energy storage module is provided, which acts on a test circuit and includes a power grid-energy storage system virtual equivalent model, a current controller, and an energy storage module / module group controller.

[0006] The test circuit is a closed loop, including a current generator, a filter and an energy storage module / module group.

[0007] The power grid-energy storage system virtual equivalent model includes a power grid response model, an energy storage system control model and a power grid-energy storage system circuit model, which is used to generate current reference signals, modulation voltage reference signals and state of charge reference signals corresponding to the high-voltage cascaded energy storage active support working condition, and send them to the current controller and the energy storage module / module group controller to simulate the interaction characteristics of the power grid and the energy storage system.

[0008] The current controller is configured to receive the current reference signal generated by the grid-ESS virtual equivalent model and the current sampling signal of the test circuit, generate a switching signal of the current generator, and control the test current generated by the current generator to be consistent with the current reference signal.

[0009] The ESS module / module group controller is configured to receive the current reference signal, the modulation voltage reference signal and the state of charge reference signal generated by the grid-ESS virtual equivalent model, and the state of charge estimation signal of the ESS module / module group of the test circuit, generate a switching signal of the ESS module / module group, and control the modulation voltage of the ESS module / module group to be consistent with the modulation voltage reference signal and the state of charge of the battery cluster to be consistent with the state of charge reference signal.

[0010] Preferably, in the grid-ESS virtual equivalent model,

[0011] The grid response model is configured to receive the active power and the reactive power generated by the ESS control model, generate a grid frequency and a grid voltage amplitude, and send them to the ESS control model, so as to simulate the frequency response characteristic and the voltage response characteristic of the grid.

[0012] The ESS control model is configured to receive the grid frequency and the grid voltage amplitude generated by the grid response model, receive the grid current generated by the grid-ESS circuit model, generate the output active power and the output reactive power and send them to the grid response model, generate the modulation voltage and the grid voltage and send them to the grid-ESS circuit model, so as to simulate the active support control characteristic of the high-voltage cascade ESS system.

[0013] The grid-ESS circuit model is configured to receive the modulation voltage and the grid voltage generated by the ESS control model, generate the grid current and send it to the ESS control model, generate the current reference signal, the modulation voltage reference signal and the state of charge reference signal, and send them to the current controller and the ESS module / module group controller, so as to simulate the electrical interaction characteristic of the grid-ESS system.

[0014] Preferably, the grid response model of the grid-ESS virtual equivalent model simulates the frequency response characteristic G Fg -P g (s) and the voltage response characteristic G Vg -Q g (s) of the grid by a transfer function:

[0015]

[0016] Wherein, F g(s) represents the Laplace transform of the grid active power, V g (s) represents the Laplace transform of the grid voltage magnitude, Q g (s) represents the Laplace transform of the grid active power, V g (s) represents the Laplace transform of the grid reactive power.

[0017] Preferably, the grid response model of the grid-ESS virtual equivalent model obtains the grid active power through the algebraic sum of the ESS active power, the generation system active power and the load active power; and obtains the grid reactive power through the algebraic sum of the ESS reactive power, the generation system reactive power, the reactive compensation system reactive power and the load reactive power.

[0018] Preferably, the ESS control model of the grid-ESS virtual equivalent model simulates the active support control characteristics of the high-voltage cascaded ESS, including:

[0019] The frequency-active control is configured to receive the grid frequency generated by the grid response model, generate a virtual ESS active power reference value, and send the virtual ESS active power reference value to the grid response model.

[0020] The voltage-reactive control is configured to receive the grid voltage magnitude generated by the grid response model, generate a virtual ESS reactive power reference value, and send the virtual ESS reactive power reference value to the grid response model.

[0021] The modulation voltage control is configured to receive the active power reference value and the reactive power reference value, and the grid current generated by the grid-ESS circuit model, generate a virtual ESS modulation voltage reference value and a grid voltage, and send the virtual ESS modulation voltage reference value and the grid voltage to the grid-ESS circuit model.

[0022] Preferably, the grid-ESS circuit model of the grid-ESS virtual equivalent model simulates the output voltage response characteristics of the actual high-voltage cascaded ESS through a transfer function the state of charge response characteristics of the battery cluster of the energy storage module of the actual high-voltage cascaded ESS and the current response characteristics of the grid

[0023]

[0024] wherein, V e (s) represents the Laplace transform of the grid active power, V sm (s) represents the Laplace transform of the grid active power, V g (s) represents the Laplace transform of the grid active power, V

[0025] Preferably, the grid-ESS virtual equivalent model of the grid-ESS circuit model obtains the virtual ESS energy storage module DC side current by multiplying the virtual ESS modulation voltage reference value and the grid current.

[0026] Preferably, the current reference signal, the modulation voltage reference signal, and the state of charge reference signal generated by the grid-ESS virtual equivalent model, the obtaining process comprises:

[0027] Selecting the energy storage module of any one phase of the three phases as the test reference object, the current reference signal is the phase current in the three-phase grid current generated by the grid-ESS circuit model;

[0028] The modulation voltage reference signal is the phase modulation voltage reference value in the virtual ESS modulation voltage reference value received by the grid-ESS circuit model;

[0029] The state of charge reference signal is the virtual ESS energy storage module battery cluster state of charge in the virtual ESS energy storage module battery cluster state of charge generated by the grid-ESS circuit model.

[0030] Preferably, in the test circuit,

[0031] The current generator comprises a power semiconductor bridge circuit and a power supply device thereof, wherein the power semiconductor bridge circuit comprises a single H-bridge or a plurality of H-bridges connected in series or in parallel, for generating the test current of the energy storage module / module group;

[0032] The energy storage module / module group comprises a single energy storage module or an energy storage module group obtained by connecting a plurality of energy storage modules in series or in parallel, and is the test object;

[0033] The filter is used to filter out high-frequency noise of the test current.

[0034] According to the second aspect of the present application, a simulation test method for active support working condition of high-voltage cascade energy storage module is provided, comprising:

[0035] Selecting actual grid parameters to input the grid response model, selecting actual high-voltage cascade energy storage system control parameters to input the energy storage system control model, and selecting actual grid-ESS circuit parameters to input the grid-ESS circuit model;

[0036] Generating the current reference signal i t * , the modulation voltage reference signal v m * , and the state of charge reference signal SoC i* ;

[0037] The test current reference signal i t * is output to the current controller and the energy storage module / module group controller, and the modulation voltage reference signal v m * is output to the energy storage module / module group controller. i * The test current reference signal i t is output to the current controller.

[0038] The test current is sampled, and the current sampling signal i i is output to the current controller.

[0039] The state of charge estimation signal SoC i of the battery cluster of the energy storage module / module group is obtained through state of charge estimation of the energy storage module / module group, and the state of charge estimation signal SoC i is output to the energy storage module / module group controller.

[0040] In the current controller, the switch signal of the current generator is obtained through current control and current controller pulse width modulation, so that the test current and the test current reference signal i t * are consistent.

[0041] In the energy storage module controller, the switch signals of the two energy storage modules / module groups are obtained through state of charge control and energy storage module / module group controller pulse width modulation, so that the modulation voltage of the energy storage module / module group and the modulation voltage reference signal v m * are consistent, and the state of charge of the battery cluster of the energy storage module / module group and the state of charge reference signal SoC i * are consistent.

[0042] Compared with the prior art, the embodiment of the present application has at least one of the following beneficial effects:

[0043] The simulation test system and method for high-voltage cascade energy storage module active support working condition in the embodiment of the present application adopts a power grid-energy storage virtual equivalent model to simulate the interaction characteristics of the power grid and the energy storage system, and can realize simulation of high-voltage cascade energy storage active support working condition under various power grid parameters and energy storage control conditions without building a complete energy storage system, so as to realize testing of a single or a small number of energy storage modules, has high testing flexibility and testing accuracy, and reduces testing cost. BRIEF DESCRIPTION OF DRAWINGS

[0044] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0045] Figure 1 This is a framework diagram of a simulation test system for the active support condition of a high-voltage cascaded energy storage module provided in one embodiment of the present invention.

[0046] Figure 2 This is a schematic diagram of the topology of the energy storage module / module group in the simulation test system of the high-voltage cascaded energy storage module active support working condition provided in a preferred embodiment of the present invention.

[0047] In the diagram, 1-Virtual equivalent model of power grid-energy storage system; 2-Power grid response model; 3-Energy storage system control model; 4-Power grid-energy storage system circuit model; 5-Current controller; 6-Energy storage module / module group controller; 7-Test circuit; 8-Current generator; 9-Energy storage module / module group; 10-Filter. Detailed Implementation

[0048] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0049] like Figure 1 As shown, in one embodiment of the present invention, a simulation test system for the active support condition of a high-voltage cascaded energy storage module is provided, which operates on test circuit 7. The test system includes a virtual equivalent model 1 of the grid-energy storage system, a current controller 5, and an energy storage module / module group controller 6; test circuit 7 is a closed loop composed of a current generator 8, a filter 10, and an energy storage module / module group 9.

[0050] Among them, the grid-energy storage system virtual equivalent model 1 includes a grid response model, an energy storage system control model and a grid-energy storage system circuit model. It is used to generate current reference signals, modulation voltage reference signals and state of charge reference signals corresponding to the active support conditions of high-voltage cascaded energy storage, and send them to the current controller 5 and the energy storage module / module group controller 6 to simulate the interaction characteristics of the grid and the energy storage system.

[0051] The current controller 5 is used to receive the current reference signal generated by the virtual equivalent model 1 of the power grid-energy storage system and the current sampling signal of the test circuit 7, generate the switching signal of the current generator 8, and control the test current generated by the current generator 8 to match the current reference signal.

[0052] The energy storage module / module group controller 6 receives the current reference signal, the modulation voltage reference signal and the state of charge reference signal generated by the grid-energy storage system virtual equivalent model 1, and the state of charge estimation signal of the energy storage module / module group 9 of the test circuit 7, generates the switching signal of the energy storage module / module group 9, controls the modulation voltage of the energy storage module / module group 9 to be consistent with the modulation voltage reference signal, and controls the state of charge of the battery cluster to be consistent with the state of charge reference signal.

[0053] The simulation test system for the active support working condition of the high-voltage cascade energy storage module in the above embodiment can improve the test accuracy and test flexibility.

[0054] Based on the above embodiment, in a preferred embodiment of the present application, the grid-energy storage system virtual equivalent model 1 comprises a grid response model 2, an energy storage system control model 3 and a grid-energy storage system circuit model 4.

[0055] In the grid-energy storage system virtual equivalent model 1,

[0056] The grid response model 2 receives the active power and the reactive power generated by the energy storage system control model 3, generates the grid frequency and the grid voltage amplitude, and sends them to the energy storage system control model 3, so as to simulate the frequency response characteristics and the voltage response characteristics of the grid.

[0057] The energy storage system control model 3 receives the grid frequency and the grid voltage amplitude generated by the grid response model 2, receives the grid current generated by the grid-energy storage system circuit model 4, generates the output active power and the output reactive power, and sends them to the grid response model 2, generates the modulation voltage and the grid voltage, and sends them to the grid-energy storage system circuit model 4, so as to simulate the active support control characteristics of the high-voltage cascade energy storage system.

[0058] The grid-energy storage system circuit model 4 receives the modulation voltage and the grid voltage generated by the energy storage system control model 3, generates the grid current, and sends it to the energy storage system control model 3; generates the current reference signal, the modulation voltage reference signal and the state of charge reference signal, and sends them to the current controller 5 and the energy storage module / module group controller 6, so as to simulate the electrical interaction characteristics of the grid-energy storage system.

[0059] In a preferred embodiment, the grid response model 2 of the grid-energy storage system virtual equivalent model 1 simulates the frequency response characteristics and the voltage response characteristics of the grid through a transfer function.

[0060]

[0061] In the grid-energy storage system virtual equivalent model 1, F g (s) represents the Laplace transform of the grid frequency, P g ​(s) represents the Laplace transform of the grid voltage magnitude, Q g (s) represents the Laplace transform of the grid voltage magnitude, Q g (s) represents the Laplace transform of the grid reactive power.

[0062] In a preferred embodiment, the grid response model 2 of the grid-ESS virtual equivalent model 1 obtains the grid active power by the algebraic sum of the ESS active power, the generation system active power and the load active power; and obtains the grid reactive power by the algebraic sum of the ESS reactive power, the generation system reactive power, the reactive compensation system reactive power and the load reactive power.

[0063] In a preferred embodiment, the ESS control model 3 of the grid-ESS virtual equivalent model 1 simulates the active support control characteristics of the high-voltage cascaded ESS, including:

[0064] The frequency-active control, including but not limited to droop control, frequency rate control and inertia response control, is used to receive the grid frequency generated by the grid response model 2, generate the active power reference value of the virtual ESS (specifically the active power reference value of the virtual ESS in the ESS control model of the grid-ESS virtual equivalent model, which corresponds to the actual ESS to be simulated) and send it to the grid response model 2. Figure 1 The frequency-active control, including but not limited to droop control, frequency rate control and inertia response control, is used to receive the grid frequency generated by the grid response model 2, generate the active power reference value of the virtual ESS (specifically the active power reference value of the virtual ESS in the ESS control model of the grid-ESS virtual equivalent model, which corresponds to the actual ESS to be simulated) and send it to the grid response model 2.

[0065] The voltage-reactive control, including but not limited to droop control and closed-loop PI control, is used to receive the grid voltage magnitude generated by the grid response model 2, generate the reactive power reference value of the virtual ESS, and send it to the grid response model 2.

[0066] The modulated voltage control is used to receive the active power reference value and the reactive power reference value, and the grid current generated by the grid-ESS circuit model 4, generate the modulated voltage reference value of the ESS and the grid voltage, and send them to the grid-ESS circuit model 4.

[0067] In a preferred embodiment, the grid-ESS circuit model 4 of the grid-ESS virtual equivalent model 1 simulates the output voltage response characteristics of the actual high-voltage cascaded ESS by transfer function The state of charge response characteristics of the battery cluster of the actual high-voltage cascaded ESS And the current response characteristics of the grid

[0068]

[0069] wherein, V e (s) represents the Laplace transform of the grid voltage magnitude, Q sm(s) represents the Laplace transform of the energy storage module DC side current of the virtual energy storage system, SoC(s) represents the Laplace transform of the battery cluster state of charge of the virtual energy storage system, I g (s) represents the Laplace transform of the grid current.

[0070] Further, the grid-energy storage system circuit model 4 of the grid-energy storage system virtual equivalent model 1 obtains the energy storage module DC side current of the energy storage system by multiplying the energy storage system modulation voltage reference value and the grid current.

[0071] In a preferred embodiment of the present application, the current reference signal, the modulation voltage reference signal, and the state of charge reference signal generated by the grid-energy storage system virtual equivalent model 1 are obtained through the following process:

[0072] Selecting the energy storage module of any one phase of the three phases as the test reference object, the current reference signal is the current of the phase in the three-phase grid current generated by the grid-energy storage system circuit model 4;

[0073] The modulation voltage reference signal is the modulation voltage reference value of the phase in the virtual energy storage system modulation voltage reference value received by the grid-energy storage system circuit model 4;

[0074] The charge state reference signal is the virtual energy storage system energy storage module battery cluster state of charge of the phase in the virtual energy storage system energy storage module battery cluster state generated by the grid-energy storage system circuit model 4.

[0075] In a preferred embodiment of the present application, the current generator 8, as shown in Figure 2 , includes a cascaded H-bridge and its power supply device, wherein the power semiconductor bridge circuit is composed of a single H-bridge, or composed of a plurality of H-bridges in series or parallel, for generating a test current of the energy storage module / module group;

[0076] for generating a test current of the energy storage module / module group 9;

[0077] The energy storage module / module group 9, as shown in Figure 2 , includes a single energy storage module, or an energy storage module group obtained by connecting a plurality of energy storage modules in series or parallel, as a test object;

[0078] The filter 10 is used to filter out high-frequency noise of the test current.

[0079] In a preferred embodiment of the present application, the current controller 5 includes current control and current controller 5 pulse width modulation, wherein the current control is used to generate a current controller 5 modulation signal tracking the current reference value signal; the current controller 5 pulse width modulation is used to generate a current generator 8 switch signal according to the current controller 5 modulation signal.

[0080] In a preferred embodiment of the present invention, the energy storage module / module group controller 6 includes state of charge control and pulse width modulation, wherein the state of charge control is used to generate a modulation signal of the energy storage module / module group controller 6 that tracks the state of charge reference value signal; and the pulse width modulation of the energy storage module / module group controller 6 is used to generate a switching signal of the energy storage module / module group 9 based on the modulation signal of the energy storage module / module group controller 6.

[0081] Based on the same inventive concept, in another embodiment of the present invention, a simulation test method for active support conditions of a high-voltage cascaded energy storage module is provided, including:

[0082] Select actual grid parameters to input into grid response model 2, select actual high-voltage cascaded energy storage system control parameters to input into energy storage system control model 3, and select actual grid-energy storage system circuit parameters to input into grid-energy storage system circuit model 4;

[0083] A current reference signal i is generated through a virtual equivalent model 1 of a power grid-energy storage system. t * Modulated voltage reference signal v m * and State of Charge Reference Signal SoC i * ;

[0084] The test current reference signal i t * The output is sent to the current controller 5 and the energy storage module / module group controller 6 to modulate the voltage reference signal v. m * and State of Charge Reference Signal SoC i * Output to energy storage module / module group controller 6;

[0085] Sample the test current and convert the current sampling signal i t Output to current controller 5;

[0086] The state-of-charge (SOC) estimation signal of the battery cluster in energy storage module / module group 9 is obtained by estimating the SOC of the energy storage module / module group 9. i and the state of charge estimation signal SoC i Output to energy storage module / module group controller 6;

[0087] In the current controller 5, the switching signal of the current generator 8 is obtained through current control and pulse width modulation of the current controller 5, so that the test current and the test current reference signal i t * Consistent;

[0088] In the energy storage module controller, two switch signals of the energy storage module / module group to be tested are obtained through state of charge control and energy storage module / module group controller 6 pulse width modulation, so that the modulation voltage of the energy storage module / module group 9 is consistent with the modulation voltage reference signal v m * The battery cluster state of charge of the energy storage module / module group 9 is consistent with the state of charge reference signal SoC i * The battery cluster state of charge of the energy storage module / module group 9 is consistent with the state of charge reference signal SoC

[0089] The modules / units in the above examples of the present application can refer to the implementation technologies of the corresponding modules of the high-voltage cascaded energy storage active support working condition energy storage module simulation test system in the above embodiments, which will not be described here.

[0090] The simulation test system and method of the high-voltage cascaded energy storage module active support working condition in the above embodiments realize the simulation of the high-voltage cascaded energy storage active support working condition, can make the current, voltage and battery cluster state of charge of the tested energy storage module consistent with the actual, and improve the test accuracy; the test of a single or a small amount of energy storage modules can be realized without building a complete energy storage system, and the test cost is reduced.

[0091] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various modifications or modifications within the scope of the claims, which does not affect the essential content of the present application. The above preferred features can be used in combination in the case of not conflicting with each other.

Claims

1. A simulation test system of high-voltage cascade energy storage module active support working condition, acting on a test circuit, characterized in that, The grid-ESS virtual equivalent model, the current controller, and the ESS module / module group controller; The test circuit is a closed loop, including a current generator, a filter, and an ESS module / module group; The grid-ESS virtual equivalent model includes a grid response model, an ESS control model, and a grid-ESS circuit model, which are used to generate current reference signals, modulation voltage reference signals, and state of charge reference signals corresponding to the active support working condition of the high-voltage cascaded ESS, and send them to the current controller and the ESS module / module group controller, so as to simulate the interaction characteristics of the grid and the ESS; The current controller is used to receive the current reference signals generated by the grid-ESS virtual equivalent model and the current sampling signals of the test circuit, and generate the switching signals of the current generator, so as to control the test current generated by the current generator to be consistent with the current reference signals; The ESS module / module group controller is used to receive the current reference signals, the modulation voltage reference signals, and the state of charge reference signals generated by the grid-ESS virtual equivalent model, and the state of charge estimation signals of the ESS module / module group of the test circuit, and generate the switching signals of the ESS module / module group, so as to control the modulation voltage of the ESS module / module group to be consistent with the modulation voltage reference signals and control the state of charge of the battery cluster to be consistent with the state of charge reference signals; In the grid-ESS virtual equivalent model, The grid response model is used to receive the active power and the reactive power generated by the ESS control model, generate the grid frequency and the grid voltage amplitude, and send them to the ESS control model, so as to simulate the frequency response characteristics and the voltage response characteristics of the grid; The ESS control model is used to receive the grid frequency and the grid voltage amplitude generated by the grid response model, receive the grid current generated by the grid-ESS circuit model, generate the output active power and the output reactive power, and send them to the grid response model, generate the modulation voltage and the grid voltage, and send them to the grid-ESS circuit model, so as to simulate the active support control characteristics of the high-voltage cascaded ESS; The grid-ESS circuit model is used to receive the modulation voltage and the grid voltage generated by the ESS control model, generate the grid current, and send it to the ESS control model; generate the current reference signals, the modulation voltage reference signals, and the state of charge reference signals, and send them to the current controller and the ESS module / module group controller, so as to simulate the electrical interaction characteristics of the grid-ESS.

2. The simulation test system of the active support working condition of the high-pressure cascade energy storage module according to claim 1, characterized in that, The grid response model of the grid- energy storage system virtual equivalent model simulates frequency response characteristics of the grid through a transfer function G Fg-Pg ( s ) and voltage response characteristics G Vg-Qg ( s ) ； wherein F g ( s ) denotes the Laplace transform of the grid frequency, P g ( s ) denotes the Laplace transform of the grid active power, V g ( s ) denotes the Laplace transform of the grid voltage magnitude, Q g ( s ) denotes the Laplace transform of the grid reactive power.

3. The simulation test system of the active support working condition of the high-pressure cascade energy storage module according to claim 1, characterized in that, The grid response model of the grid-ESS virtual equivalent model obtains the grid active power through the algebraic sum of the active power of the ESS, the active power of the power generation system, and the active power of the load; and obtains the grid reactive power through the algebraic sum of the reactive power of the ESS, the reactive power of the power generation system, the reactive power of the reactive compensation system, and the reactive power of the load.

4. The simulation test system for active support conditions of high-pressure cascade energy storage modules according to claim 1, characterized in that, The ESS control model of the grid-ESS virtual equivalent model simulates the active support control characteristics of the high-voltage cascaded ESS, including: Frequency-active control, for receiving the grid frequency generated by the grid response model, generating the virtual energy storage system active power reference value, and sending to the grid response model; Voltage-reactive control, for receiving the grid voltage amplitude generated by the grid response model, generating the virtual energy storage system reactive power reference value, and sending to the grid response model; Modulation voltage control, for receiving the active power reference value and the reactive power reference value, and the grid current generated by the grid-energy storage system circuit model, generating the virtual energy storage system modulation voltage reference value and the grid voltage, and sending to the grid-energy storage system circuit model.

5. The simulation test system of active support working condition of high pressure cascade energy storage module according to claim 1, characterized in that, The grid- energy storage system circuit model of the grid- energy storage system virtual equivalent model simulates an output voltage response characteristic of an actual high-voltage cascaded energy storage system G Ve-Ism ( s ), a state of charge response characteristic of an energy storage module battery cluster of the actual high-voltage cascaded energy storage system G SoC-Ism ( s ), and a current response characteristic of the grid G Ig-Ve ( s ) ； wherein, V e ( s ) denotes the Laplace transform of the virtual energy storage system output voltage, I sm ( s ) denotes the Laplace transform of the virtual energy storage system energy storage module DC side current, SoC ( s ) denotes the Laplace transform of the virtual energy storage system energy storage module battery cluster state of charge, I g ( s ) denotes the Laplace transform of the grid current.

6. The simulation test system for active support conditions of high-pressure cascade energy storage modules according to claim 5, characterized in that, The grid-energy storage system circuit model of the grid-energy storage system virtual equivalent model, through the product of the virtual energy storage system modulation voltage reference value and the grid current, obtains the virtual energy storage system energy storage module DC side current.

7. The simulation test system of active support working condition of high pressure cascade energy storage module according to claim 1, characterized in that, The current reference signal, the modulation voltage reference signal, and the state of charge reference signal generated by the grid-energy storage system virtual equivalent model, the obtaining process includes: Selecting the energy storage module of any one phase of the three-phase as the test reference object, the current reference signal is the current of the phase in the three-phase grid current generated by the grid-energy storage system circuit model; The modulation voltage reference signal is the modulation voltage reference value of the phase in the virtual energy storage system modulation voltage reference value received by the grid-energy storage system circuit model; The state of charge reference signal is the state of charge of the virtual energy storage system energy storage module battery cluster of the phase in the virtual energy storage system energy storage module battery cluster state of charge generated by the grid-energy storage system circuit model.

8. The simulation test system of active support working condition of high pressure cascade energy storage module according to claim 1, characterized in that, In the test circuit, The current generator includes a power semiconductor bridge circuit and its power supply device, wherein the power semiconductor bridge circuit includes a single H-bridge, or multiple H-bridges connected in series or parallel, for generating the test current of the energy storage module / module group; The energy storage module / module group includes a single energy storage module, or an energy storage module group obtained by connecting multiple energy storage modules in series or parallel, as the test object; The filter is used to filter out the high-frequency noise of the test current.

9. A simulation test method of the active support working condition of the high-voltage cascade energy storage module, using the simulation test system of the active support working condition of the high-voltage cascade energy storage module according to claim 1, characterized in that, It includes: Selecting the actual grid parameter to input the grid response model, selecting the actual high-voltage cascade energy storage system control parameter to input the energy storage system control model, and selecting the actual grid-energy storage system circuit parameter to input the grid-energy storage system circuit model; generating a current reference signal by the grid- energy storage system virtual equivalent model , a modulated voltage reference signal and a state of charge reference signal ; The current reference signal is output to a current controller and an energy storage module / module pack controller, the modulated voltage reference signal and a state of charge reference signal are output to the energy storage module / module pack controller; A test current is sampled and a current sample signal i t is output to the current controller. a state of charge estimation signal of a battery cluster of the energy storage module / module group is obtained by state of charge estimation of the energy storage module / module group SoC i and outputting the state of charge estimation signal SoC i to the energy storage module / module group controller; In the current controller, the switching signals of the current generator are obtained by current control and current controller pulse width modulation, so that the test current and the current reference signal correspond; In the energy storage module / module group controller, through state of charge control and energy storage module / module group controller pulse width modulation, two switch signals of the energy storage module / module group are obtained, so that the modulation voltage of the energy storage module / module group is consistent with the modulation voltage reference signal , the battery cluster state of charge of the energy storage module / module group is consistent with the state of charge reference signal .

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