A Control Method for Shore Power Energy Router Considering DC Bus Voltage Regulation

Abstract

The present invention relates to a control method for an onshore power energy router considering DC bus voltage stabilization. The present invention includes: controlling each port of the onshore power energy router connected with photovoltaic, ship and hybrid energy storage; adopting virtual synchronous machine control for the grid-connected converter part of the onshore power energy router and virtual DC motor control for the DC port of the onshore power energy router; comprehensively considering the power density complementary characteristics of the hybrid energy storage and the port compact characteristics of the energy router, equivalent impedance is carried out for the virtual DC motor control, and two-level parallel collaborative control is carried out on it; by introducing a DC bus voltage regulation link, the active power control of the virtual synchronous machine control is improved; according to the remaining capacity index SOC of the energy storage unit, the control parameters of the improved virtual synchronous machine control are adjusted to achieve seamless switching of frequency support and DC bus voltage support under different working conditions of the onshore power energy router.

Description

Technical Field

[0001] The present invention relates to a control method for an energy router, and particularly to a control method for an onshore power energy router considering DC bus voltage stabilization. Background Art

[0002] With the promotion of the construction of new ports and the popularization of electrified ships, new energy and new power electronic devices are connected to the port power grid. The single power supply mode of the traditional port power grid is gradually unable to adapt to the increasingly complex port power interaction conditions. As a key device of the new onshore power system, the energy router has many functions such as flexible grid interconnection, multi-voltage level and type conversion, and bidirectional energy flow, and can effectively meet the port power control requirements under various port impact loads including ship onshore power and the access of new energy with random fluctuations in power generation. At the same time, energy storage, new energy, and electric ships are connected to the grid through the onshore power energy router, enabling the onshore power energy router system of the port to have resources for actively supporting the grid frequency.

[0003] However, the existing control of the onshore power energy router has the following problems:

[0004] (1) Currently, the mainstream research on active frequency support technology focuses on virtual synchronous machine control technology, without giving full play to the integration advantages of various resources of the onshore power energy router while taking into account the stability of the onshore power energy router.

[0005] (2) The VDCM control of the onshore power energy router does not comprehensively consider the power density complementary characteristics of the hybrid energy storage and the compact characteristics of the energy router ports, and the research on multi-VDCM parallel control is insufficient.

[0006] (3) After the grid-connected converter of the onshore power energy router is controlled by VSG, the grid cannot provide necessary voltage support for the DC bus, and will additionally generate frequency modulation power, affecting the stability of the DC bus. Summary of the Invention

[0007] Object of the Invention: To solve the technical problems existing in the above-mentioned prior art, the present invention proposes a control method for an onshore power energy router considering DC bus voltage stabilization. The object of the present invention is to solve the problem that the VSG control of the onshore power energy router affects the stability of the energy router itself, improve the stability of the bus at the energy storage port and the stability of the bus considering the grid-connected port. In addition, it also solves the problem of DC bus voltage fluctuation of the onshore power energy router under complex working conditions, and improves the problem of the dynamic response of the grid-connected converter unable to take into account the grid frequency and the DC bus voltage transient process.

[0008] Technical solution: To achieve the above object, the control method of the onshore power energy router considering DC bus voltage stabilization according to the present invention is applied to the onshore power energy router topology with photovoltaic, ship, power grid and hybrid energy storage access, and includes: the AC port output of the grid-connected converter of the onshore power energy router adopts virtual synchronous generator (VSG) control, and the DC port output of the onshore power energy router adopts two-level parallel collaborative control; the two-level parallel collaborative control includes: performing primary control on the DC port output voltage through a virtual DC motor (VDCM) based on control parameters, and performing secondary control on the DC port output voltage through an upper-layer central controller; the control method of the onshore power energy router further includes: adjusting the VSG power control parameters according to the remaining capacity index SOC of the energy storage unit to achieve seamless switching of frequency support and DC bus voltage support under different working conditions of the onshore power energy router; the adjusting the control parameters of the VSG and VDCM according to the remaining capacity index SOC of the energy storage unit includes: calculating the weight coefficient of the SOC adjustment coefficient according to the remaining capacity of the hybrid energy storage, calculating the comprehensive SOC adjustment coefficient of the hybrid energy storage system according to the SOC adjustment coefficients of each energy storage device in the hybrid energy storage and the weight coefficient of the SOC adjustment coefficient, and adjusting the power control parameters of the VSG and VDCM according to the comprehensive SOC adjustment coefficient to achieve coordinated control of the hybrid energy storage.

[0009] The onshore power energy router includes a solid-state power unit, a sampling and communication unit, and a decision and control unit. Among them, the solid-state power unit includes a power electronic conversion circuit and a peripheral interface. The sampling and communication unit includes voltage and current sensors, a signal conditioning circuit, and internal and external communication ports. The decision and control unit realizes decision control through a microprocessor; the AC side of the onshore power energy router is connected to the DC and AC buses through a combined inverter circuit, and the combined inverter has an independent three-phase structure on the AC side.

[0010] The rotor motion equation of the virtual synchronous machine control is:

[0011]

[0012] In the formula, is the virtual mechanical power; is the electromagnetic power; ω VSG is its virtual electrical angular velocity; is the preset angular velocity; D VSG is the VSG virtual damping coefficient; θ is the rotor angle; J VSG is the virtual moment of inertia, and t is time;

[0013] The excitation regulation equation of the VSG is as follows:

[0014]

[0015] Among them, and are the reactive voltage droop coefficient and the reactive power droop regulation coefficient respectively; U n and U e are the voltage setpoint and the actual effective voltage respectively; and Q e are the reactive power reference value and the actual measured value respectively; the no-load electromotive force of the VSG is is the given electromotive force of the VSG.

[0016] The virtual DC motor VDCM performs primary control on the DC port output voltage based on control parameters, including: according to the actual value of the DC bus voltage and the DC bus voltage reference value given by the onshore power energy router, the deviation of the DC bus voltage is controlled without error through a PI regulator, and the mechanical torque of the virtual DC motor VDCM is used as the controlled quantity. The stator voltage equation of the VDCM is:

[0017]

[0018] In the formula, E VDCM is the virtual armature electromotive force of the VDCM, I VDCM is the interaction current between the DC side of the onshore power energy router and the bus; is the equivalent resistance of the VDCM; U DC is the terminal voltage of the virtual DC motor;

[0019] The rotor mechanical equation of the VDCM is:

[0020]

[0021] In the formula, J VDCM is the virtual moment of inertia of the VDCM; is the virtual mechanical torque of the VDCM, is the virtual electromagnetic torque of the VDCM; D VDCM is the virtual damping coefficient of the VDCM; ω VDCM and are the virtual angular velocity and the rated angular velocity of the VDCM respectively, and t is the time.

[0022] The secondary control of the DC port output voltage by the upper-layer central controller includes: the central controller of the onshore power energy router calculates and issues the angular velocity of the DC bus, and at the same time calculates and issues the virtual moment of inertia and damping coefficient of each unit VDCM according to the actual state of the hybrid energy storage.

[0023] Calculating and issuing the virtual moment of inertia and damping coefficient of each unit VDCM according to the actual state of the hybrid energy storage, and the calculation formula is:

[0024]

[0025] In the formula, JVDCM,q and D VDCM,q are the virtual moment of inertia and damping coefficient of each unit VDCM respectively, and P H VDCM,q and are the dynamic power capacity and static power capacity of each unit VDCM respectively, and J VDCM,eq and D VDCM,eq are the equivalent inertia constant and equivalent damping coefficient of the parallel VDCM respectively, and n is the number of converters.

[0026] The AC port output of the grid-connected converter of the onshore power energy router adopts VSG control with a DC bus voltage regulation link introduced. The VSG control with the DC bus voltage regulation link introduced includes: the power reference value transmitted by the onshore power energy router to the grid and the power reference value transmitted by the onshore power energy router to the DC bus ref are adjusted without error through a PI controller to obtain an updated power reference value P ref transmitted by the onshore power energy router to the grid, and the AC port output power is controlled according to the updated power reference value; according to the updated power reference value P ref transmitted by the onshore power energy router to the grid, the power flow direction of the onshore power energy router grid-connected converter is controlled: when P ref >0, the active power flows from the grid to the onshore power energy router; when P

[0027] <0, the active power flows from the onshore power energy router to the grid.

[0028]

[0029] In the formula: λ i is the weight coefficient of the SOC regulation coefficient, and i ∈ {sc, lb} represents the supercapacitor or battery; is the SOC value of the energy storage i, is the lower limit of the SOC value of the energy storage i, is the upper limit of the SOC value of the energy storage i; are the charge and discharge flag variables respectively.

[0030] According to the SOC regulation coefficients of each energy storage device in the hybrid energy storage and the weight coefficient of the SOC regulation coefficient, the comprehensive SOC regulation coefficient of the hybrid energy storage system is calculated. The calculation formula is:

[0031]

[0032] In the formula, k socis the comprehensive SOC regulation coefficient of the hybrid energy storage system, and is the weight coefficient of the SOC regulation coefficient. is the SOC regulation coefficient of the supercapacitor. is the SOC regulation coefficient of the battery, λ sc is the weight coefficient of the SOC regulation coefficient of the supercapacitor, λ lb is the weight coefficient of the SOC regulation coefficient of the battery.

[0033] Adjust the power control parameters of VSG and VDCM according to the comprehensive SOC regulation coefficient, and the adaptive regulation strategy is:

[0034]

[0035] In the formula: are the steady-state values of the virtual moment of inertia of VSG and VDCM respectively; are the steady-state values of the virtual damping of VSG and VDCM respectively; are the adjustment amounts of the virtual moment of inertia of VSG and VDCM respectively, is the adjustment amount of the virtual damping of VSG and VDCM, k soc is the comprehensive SOC regulation coefficient of the hybrid energy storage system.

[0036] Beneficial effects: The control method of the onshore power energy router considering DC bus voltage regulation described in the present invention has the following technical effects compared with the prior art by adopting the above technical solutions:

[0037] (1) The present invention uses VSG to control the grid-connected converter of the onshore power energy router and VDCM to control the DC port of the onshore power energy router, improving the active support ability of the onshore power energy router for the grid frequency and the stability of the main bus voltage.

[0038] (2) In order to avoid the voltage fluctuation generated by single VDCM control during power variation, the present invention uses two-level VDCM in parallel to coordinate the power output, reducing the voltage fluctuation of the DC bus of the onshore power energy router.

[0039] (3) Aiming at the problem that the grid-connected converter after VSG control cannot provide necessary voltage support for the DC bus and additionally generates frequency modulation power to affect the stability of the DC bus, the present invention improves the active power control of VSG control and determines the comprehensive SOC regulation coefficient in combination with the SOC of the energy storage, thereby avoiding the risk of state of charge over-limit of the onshore power energy router under complex port conditions. Description of the Drawings

[0040] Figure 1 is the topology diagram of the onshore power energy router in the embodiment of the present invention;

[0041] Figure 2It is the block diagram of the VSG control algorithm for the embodiments of the present invention;

[0042] Figure 3 It is the schematic diagram of the VDCM control for the embodiments of the present invention;

[0043] Figure 4 It is the equivalent impedance network model diagram of the VDCM system for the embodiments of the present invention;

[0044] Figure 5 It is the improved control structure diagram of the grid-connected converter of the VSG for the embodiments of the present invention. Specific embodiments

[0045] The present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand and implement the present invention more deeply.

[0046] As Figure 1 shown, it is the topology diagram of the onshore power energy router for the embodiments of the present invention. The control method of the onshore power energy router considering DC bus voltage regulation is applied to this topology. The AC side of the onshore power energy router is connected to the DC and AC buses by a combined inverter circuit. The AC voltage is 380V, and the DC bus voltage is 750V. The AC-DC power flow is realized through a three-phase bridge topology; the DC side uses a half-bridge circuit, which can be flexibly switched between Boost, Buck, and bidirectional Buck-Boost modes according to the power supply and load requirements.

[0047] The block diagram of the VSG control algorithm is as Figure 2 shown. The VSG algorithm simulates the process of the frequency fluctuating with the rotor speed when the synchronous machine system is disturbed through the rotor motion equation, and obtains the ability of the equivalent synchronous machine rotor's inertia and damping characteristics. The rotor motion equation of the VSG is:

[0048]

[0049] In formula (1), is the virtual mechanical power; is the electromagnetic power; ω VSG is its virtual electrical angular velocity; is the preset angular velocity; D VSG is the damping coefficient; θ is the rotor angle; J VSG is the VSG virtual moment of inertia;

[0050] It is adjusted through reactive power droop control to obtain voltage regulation ability. The excitation regulation equation of the VSG is as follows:

[0051]

[0052] Among them, and They are the reactive voltage droop coefficient and the reactive droop regulation coefficient respectively; U n and U e are the voltage set value and the actual effective voltage respectively

[36] ; and the partial Q e are the reactive power reference value and the actual measured value respectively; The no-load electromotive force of the VSG is The given electromotive force of the VSG is

[0053] The schematic diagram of the VDCM control is as Figure 3 shown. For the DC port of the onshore power energy router controlled by VDCM, its output virtual potential is proportional to the angular velocity ω VDCM of the controlled DC bus. By adjusting ω VDCM , the output voltage of the VDCM control is adjusted to stabilize the DC bus voltage of the onshore power energy router.

[0054] As Figure 4 shown, in the equivalent impedance network model diagram of the VDCM system, the internal wiring of the energy router is similar and the impedance is very small, and the interface voltages of the converters connected in parallel to the same bus can be approximately equal; The output power of the VDCM is approximately equal to the ratio of the output current. In S3, the VDCM performs primary control of the voltage based on parameters to control the output power of the converter, and the energy router controller performs secondary control. In the two-level parallel collaborative control of the VDCM, the upper central controller calculates and issues the angular velocity ω VDCM,q of the DC bus, reduces the DC bus voltage deviation of the onshore power energy router introduced by the equivalent impedance voltage drop of the converter, and at the same time calculates and issues the damping coefficient D VDCM,q and the virtual impedance J VDCM,q of each unit VDCM according to the actual state of the hybrid energy storage. The calculation formula is:[[]]

[0055]

[0056] In formula (5), and are the dynamic power capacity and the static power capacity of the parallel VDCM respectively.

[0057] q represents the DC converter port under the control of the q-th VDCM of the DC of the onshore power energy router.

[0058] As Figure 5 shown, in the improved control structure of the grid-connected converter of the VSG, when the grid frequency fluctuates, the power reference value transmitted by the onshore power energy router to the grid and the power reference value transmitted by the grid-connected converter to the DC bus obtain a new power reference value P ref transmitted by the onshore power energy router to the grid through the PI controller, the operating mode of the grid-connected converter of the onshore power router is determined by comparing P ref with 0. When P ref > 0, the active power flows from the large power grid to the energy router; when P ref < 0, the active power flows from the energy router to the large power grid.

[0059] The output power of the energy storage under different virtual inertias will have different effects on the SOC. A larger VSG frequency modulation virtual inertia results in a longer system response time, requiring more energy from the energy storage. At the same time, the power rises slowly and the time accumulation is long; while in the case of small virtual inertia, the charge and discharge power fluctuates violently, and the SOC value of the supercapacitor also fluctuates frequently. Define the energy storage charge and discharge coefficient k soc as:

[0060]

[0061] The energy storage charge and discharge coefficient is used to adjust the discharge speed. In the formula: P cref is the output power of the energy storage. When its value is positive, it means the power flows from the energy storage to the energy router; when it is negative, it means the power flows from the energy router to the energy storage; are the adjustment coefficients corresponding to the charge and discharge states of the energy storage, respectively, and are calculated through the SOC.

[0062] Let the SOC adjustment coefficient of the supercapacitor the SOC adjustment coefficient of the battery be:

[0063]

[0064] It can be seen from formula (5) that when the energy storage capacity is insufficient, the lower the SOC, the smaller the SOC adjustment coefficient , the less energy released by the energy storage, and the smaller the decrease in SOC at steady state, avoiding a large amount of discharge of the energy storage under the condition of too low SOC; the same analysis applies when charging and the SOC value is too high.

[0065] In the improved control of the grid-connected converter based on VSG, the grid frequency inertia and the DC bus voltage inertia have opposite energy requirements for the energy storage, that is, they have opposite effects on the SOC. In this paper, a weight coefficient λ is introduced, and its relationship formula is:

[0066]

[0067] In formula (6): i ∈ {sc, lb} represents the supercapacitor or the battery; is the SOC value of the energy storage i are the charge and discharge flag variables, respectively, and can be obtained from the formula:

[0068]

[0069] In formula (7): P i is the output power of the supercapacitor or the storage battery.

[0070] Then, the SOC adjustment coefficient k of the hybrid energy storage system soc is:

[0071]

[0072] Then, the improved VSG control parameter adaptive strategy can be expressed as:

[0073]

[0074] In formula (9): are the steady-state values of the virtual inertia for frequency regulation and voltage regulation respectively; is the steady-state value of the virtual damping for frequency regulation and voltage regulation; are the adjustment amounts of the virtual inertia for frequency regulation and voltage regulation respectively, is the adjustment amount of the virtual damping for frequency regulation and voltage regulation.

[0075] Based on the SOC of the energy storage, the improved control parameter adaptive strategy of the shore power energy router determines the comprehensive SOC adjustment coefficient according to the SOC of the two energy storages respectively. When the energy storage adjustment capacity is insufficient, it reduces the output of frequency regulation or voltage regulation to suppress the over-limit of the energy storage SOC. It determines the weight coefficient of the power regulation coefficient according to the remaining capacity of the hybrid energy storage, enabling the adjustment of the virtual DC motor to refer to the energy storage SOC state, ensuring that the SOC of the energy storage is within a reasonable range, and realizing the coordinated control of the hybrid energy storage.

[0076] The present invention proposes a control method for a shore power energy router considering DC bus voltage stabilization. It uses VSG to control the grid-connected converter of the shore power energy router and VDCM to control the DC port of the shore power energy router, improving the active support ability of the shore power energy router for the grid frequency and the stability of the main DC bus voltage. It uses two-level VDCM in parallel to coordinate the power output, avoiding the DC bus voltage fluctuation generated by single VDCM control during power variation. It improves the active power control of VSG and combines the SOC to determine the weight coefficient of the power regulation coefficient, realizing seamless switching between frequency support and DC bus voltage support under different working conditions of the shore power energy router.

Claims

1. A shore power energy router control method taking into account DC bus voltage stabilization, which is applied to shore power energy router topologies connected to photovoltaic, ship, power grid and hybrid energy storage, characterized in that: include: The AC port output of the grid-connected converter of the shore power energy router is controlled by a virtual synchronous machine VSG, and the DC port output of the shore power energy router is controlled by two-level parallel collaborative control; the two-level parallel collaborative control includes: controlling the DC port output voltage once based on the control parameters by the virtual DC motor VDCM, and controlling the DC port output voltage twice by the upper central controller; the shore power energy router control method also includes: adjusting the VSG power control parameters according to the remaining capacity index SOC of the energy storage unit to achieve seamless switching of frequency support and DC bus voltage support under different working conditions of the shore power energy router; the control parameters of VSG and VDCM adjusted according to the remaining capacity index SOC of the energy storage unit include: calculating the weight coefficient of the SOC adjustment coefficient according to the remaining capacity of the hybrid energy storage, calculating the comprehensive SOC adjustment coefficient of the hybrid energy storage system according to the SOC adjustment coefficient of each energy storage device in the hybrid energy storage and the weight coefficient of the SOC adjustment coefficient, adjusting the power control parameters of VSG and VDCM according to the comprehensive SOC adjustment coefficient, and realizing coordinated control of the hybrid energy storage; The AC port output of the grid-connected converter of the shore power energy router adopts VSG control with the DC bus voltage regulation link, and the VSG control with the DC bus voltage regulation link includes: the power reference value transmitted by the shore power energy router to the power grid The power reference value delivered by the shore power energy router to the DC bus The difference is adjusted by the PI controller to obtain the updated power reference value P transmitted by the shore power energy router to the grid. ref , according to the updated power reference value transmitted by the shore power energy router to the grid, the AC port output power is controlled; according to the updated power reference value P transmitted by the shore power energy router to the grid, the AC port output power is controlled; ref Control the power flow of the shore power energy router grid-connected converter: When P ref >0, active power flows from the grid to the shore power energy router; when P ref <0, active power flows from the shore power energy router to the grid.

2. A shore power energy router control method taking into account DC bus voltage stabilization according to claim 1, characterized in that: The shore power energy router includes a solid-state power unit, a sampling and communication unit, and a decision and control unit. The solid-state power unit includes a power electronic conversion circuit and a peripheral interface, the sampling and communication unit includes a voltage and current sensor, a signal conditioning circuit, and internal and external communication ports, and the decision and control unit implements decision control through a microprocessor; the shore power energy router uses a combined inverter circuit to connect the DC and AC busbars on the AC side, and the combined inverter has an independent three-phase structure on the AC side.

3. A shore power energy router control method taking into account DC bus voltage stabilization according to claim 1, characterized in that: The rotor motion equation of the virtual synchronous machine control is: In the formula, is the virtual mechanical power; P e VSG is the electromagnetic power; ω VSG is its virtual electrical angular velocity; is the preset angular velocity; D VSG is the VSG virtual damping coefficient; θ is the rotor angle; J VSG is the virtual moment of inertia, t is the time; The excitation regulation equation of VSG is as follows: in, and K r VSG are reactive voltage regulation coefficient and reactive droop regulation coefficient respectively; U n and U e They are the voltage setting value and the actual voltage effective value respectively; and Q e are the reactive power reference value and the actual measured value respectively; the no-load electromotive force of VSG is Give the electromotive force to VSG.

4. A shore power energy router control method taking into account DC bus voltage stabilization according to claim 1, characterized in that: The virtual DC motor VDCM controls the DC port output voltage based on the control parameters, including: according to the actual value of the DC bus voltage and the DC bus voltage reference value given by the shore power energy router, the deviation of the DC bus voltage is controlled by the PI regulator without difference. The mechanical torque of the virtual DC motor VDCM is used as the controlled quantity, and the stator voltage equation of VDCM is: In the formula, E VDCM is the virtual armature electromotive force VDCM, I VDCM It is the interaction current between the DC side of the shore power energy router and the busbar; is the VDCM equivalent resistance; U DC is the virtual DC motor terminal voltage; The rotor mechanical equation of the VDCM is: In the formula, J VDCM is the VDCM virtual moment of inertia; is the VDCM virtual mechanical torque, T e VDCM is the VDCM virtual electromagnetic torque; D VDCM is the VDCM virtual damping coefficient; ω VDCM and are VDCM virtual angular velocity and rated angular velocity respectively, and t is time.

5. A shore power energy router control method taking into account DC bus voltage stabilization according to claim 1, characterized in that: The secondary control of the DC port output voltage by the upper central controller includes: the central controller of the shore power energy router calculates and sends the angular velocity of the DC bus, and calculates and sends the virtual moment of inertia and damping coefficient of each unit VDCM according to the actual state of the hybrid energy storage.

6. A shore power energy router control method taking into account DC bus voltage stabilization according to claim 5, characterized in that: According to the actual state of the hybrid energy storage, the virtual moment of inertia and damping coefficient of each unit VDCM are calculated and issued. The calculation formula is: In the formula, J VDCM,q and D VDCM,q are the virtual moment of inertia and damping coefficient of each unit VDCM, and are the dynamic power capacity and static power capacity of each unit VDCM, J VDCM,eq and D VDCM,eq are the equivalent inertia constant and equivalent damping coefficient of the parallel VDCM respectively, and n is the number of converters.

7. A shore power energy router control method taking into account DC bus voltage stabilization according to claim 1, characterized in that: The weight coefficient of the SOC adjustment coefficient is calculated according to the remaining capacity of the hybrid energy storage, and the relationship is: Where: i is the weight coefficient of the SOC adjustment coefficient, i∈{sc,lb} represents a supercapacitor or a battery; is the SOC value of energy storage i, is the lower limit of the SOC value of energy storage i, is the upper limit of the SOC value of energy storage i; They are charge and discharge flag variables respectively.

8. A shore power energy router control method taking into account DC bus voltage stabilization according to claim 1, characterized in that: According to the SOC adjustment coefficient of each energy storage device in the hybrid energy storage and the weight coefficient of the SOC adjustment coefficient, the comprehensive SOC adjustment coefficient of the hybrid energy storage system is calculated, and the calculation formula is: In the formula, k soc is the comprehensive SOC regulation coefficient of the hybrid energy storage system, the weight coefficient of the SOC regulation coefficient, is the SOC adjustment coefficient of the supercapacitor, is the SOC adjustment coefficient of the battery, λ sc is the weight coefficient of the SOC adjustment coefficient of the supercapacitor, λ lb is the weight coefficient of the battery's SOC adjustment coefficient.

9. A shore power energy router control method taking into account DC bus voltage stabilization according to claim 1, characterized in that: The power control parameters of VSG and VDCM are adjusted according to the comprehensive SOC adjustment coefficient, and the adaptive adjustment strategy is: Where: are the steady-state values ​​of the virtual moment of inertia of VSG and VDCM, respectively; are the steady-state values ​​of the virtual damping of VSG and VDCM, respectively; are the adjustment values ​​of the virtual moment of inertia of VSG and VDCM respectively, is the adjustment amount of the virtual damping of VSG and VDCM, k soc is the comprehensive SOC regulation coefficient of the hybrid energy storage system.

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