A hybrid energy storage VSG control system stability analysis method and system

Abstract

The present invention provides a hybrid energy storage VSG control system stability analysis method and system, the method establishes a hybrid energy storage virtual synchronous machine rotor mechanical equation and a reactive power regulation equation; linearizes and Laplace transforms the state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation, and represents them with a small disturbance signal; calculates the hybrid energy storage VSG control system output active power according to the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation; and derivates the virtual damping coefficient by the maximum value of the hybrid energy storage VSG control system output active power to perform a hybrid energy storage VSG control system stability analysis. By implementing the present invention, the ideal effect of the hybrid energy storage VSG control system participating in regulation is achieved.

Description

Technical Field

[0001] The present invention relates to the field of hybrid energy storage technology, and in particular to a hybrid energy storage VSG control system stability analysis method and system. Background Art

[0002] As one of the key technical supports for my country's energy transformation, large-scale energy storage technology has received widespread attention in the industry in recent years because it can provide a variety of auxiliary services such as peak load regulation, frequency regulation, and emergency response for the power grid. The distributed hybrid energy storage system consists of batteries and supercapacitors, which are connected to the power grid through converters. It has the ability to flow power in both directions, and has the advantages of rapid power regulation and diverse application modes. The distributed hybrid energy storage system will affect the frequency stability of the grid due to its low inertia and low damping characteristics. In order to make the energy storage converter control system have the same rotational inertia and damping as the synchronous motor, the virtual synchronous machine (VSG) control technology is currently widely used to enable it to participate in the regulation of grid frequency and voltage like a synchronous generator. However, the current hybrid energy storage VSG control system does not participate in the regulation effect, and still affects the frequency stability of the grid. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of unsatisfactory participation regulation effect of the hybrid energy storage VSG control system in the prior art, thereby providing a hybrid energy storage VSG control system stability analysis method and system.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] In a first aspect, an embodiment of the present invention provides a hybrid energy storage VSG control system stability analysis method, comprising:

[0006] Establish the rotor mechanical equation and reactive power regulation equation of hybrid energy storage virtual synchronous machine;

[0007] The state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and reactive power regulation equation are linearized and Laplace transformed, and represented by small disturbance signals;

[0008] The output active power of the hybrid energy storage VSG control system is calculated based on the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation;

[0009] The maximum active power output by the hybrid energy storage VSG control system is derived from the virtual damping coefficient to perform stability analysis on the hybrid energy storage VSG control system.

[0010] Optionally, the method of calculating the output active power of the hybrid energy storage VSG control system according to the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation includes:

[0011] The transfer function equation is calculated based on the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation;

[0012] The output active power of the hybrid energy storage VSG control system is calculated according to the transfer function equation.

[0013] Optionally, the method of performing a stability analysis of the hybrid energy storage VSG control system by deriving the maximum active power output by the hybrid energy storage VSG control system with respect to the virtual damping coefficient includes:

[0014] According to the output active power of the hybrid energy storage VSG control system, the response function of the VSG control system output active power in the time domain is obtained;

[0015] The maximum value of active power is obtained according to the response function in the time domain of the active power output of the VSG control system;

[0016] The maximum active power output of the hybrid energy storage VSG control system is derived from the virtual damping coefficient, and the influence of the virtual damping coefficient on the output power is analyzed.

[0017] Optionally, the small disturbance signal is expressed by the following formula:

[0018]

[0019] Where H is the virtual moment of inertia, ω is the virtual angular frequency, s is the Laplace operator, D is the virtual damping coefficient, P m is the virtual mechanical power, P e is the virtual electromagnetic power, ω0 is the rated angular frequency, δ is the virtual power angle, S e is the apparent power output by the VSG.

[0020] Optionally, the transfer function equation is expressed by the following formula:

[0021]

[0022] Among them, P e (s), P m (s) is the power frequency small signal model of VSG output power and virtual mechanical power in the s domain,

[0023] Optionally, the output active power of the hybrid energy storage VSG control system is expressed by the following formula:

[0024]

[0025] Among them, P e is the virtual electromagnetic power, VSG has no stator winding loss, P e Also known as VSG control output power, G(s) is the transfer function equation, ΔP m (s) is the industrial frequency small signal model of the virtual mechanical power change in the s domain.

[0026] Optionally, the VSG control system output active power time domain response function is expressed by the following formula:

[0027]

[0028] in,

[0029] In a second aspect, an embodiment of the present invention provides a hybrid energy storage VSG control system stability analysis system, comprising:

[0030] Model building module, used to establish the rotor mechanical equation and reactive power regulation equation of the hybrid energy storage virtual synchronous machine;

[0031] The first calculation module is used to linearize and Laplace transform the state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and reactive power regulation equation, and represent them with a small disturbance signal;

[0032] The second calculation module is used to calculate the output active power of the hybrid energy storage VSG control system according to the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation;

[0033] The third calculation module is used to derive the maximum active power output by the hybrid energy storage VSG control system with respect to the virtual damping coefficient, and perform stability analysis on the hybrid energy storage VSG control system.

[0034] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the hybrid energy storage VSG control system stability analysis method described in the first aspect of the embodiment of the present invention.

[0035] In a fourth aspect, an embodiment of the present invention provides a computer device, comprising: a memory and a processor, wherein the memory and the processor are connected to each other in communication, the memory stores computer instructions, and the processor executes the hybrid energy storage VSG control system stability analysis method described in the first aspect of the embodiment of the present invention by executing the computer instructions.

[0036] The technical solution of the present invention has the following advantages:

[0037] The hybrid energy storage VSG control system stability analysis method provided by the present invention includes: establishing a hybrid energy storage virtual synchronous machine rotor mechanical equation and a reactive power regulation equation; linearizing and Laplace transforming the state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation, and expressing them with a small disturbance signal; calculating the output active power of the hybrid energy storage VSG control system according to the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation; and performing a stability analysis of the hybrid energy storage VSG control system by deriving the virtual damping coefficient from the maximum value of the output active power of the hybrid energy storage VSG control system. By linearizing and Laplace transforming the VSG control system, the stability of the hybrid energy storage VSG control system is analyzed, and the relationship between the virtual damping and the energy storage frequency oscillation is obtained. Therefore, the hybrid energy storage frequency oscillation is suppressed according to the relationship between the virtual damping and the energy storage frequency oscillation, and the ideal effect of the hybrid energy storage VSG control system participating in the regulation is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a flowchart of a specific example of a method for analyzing the stability of a hybrid energy storage VSG control system in an embodiment of the present invention;

[0040] Figure 2 A topological structure diagram of a microgrid containing hybrid energy storage in an embodiment of the present invention;

[0041] Figure 3 The hybrid energy storage DC / AC converter topology and VSG control flow chart in the embodiment of the present invention

[0042] Figure 4 It is a principle block diagram of a specific example of a hybrid energy storage VSG control system stability analysis system in an embodiment of the present invention;

[0043] Figure 5 A composition diagram of a specific example of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] The embodiment of the present invention provides a hybrid energy storage VSG control system stability analysis method, such as Figure 1 As shown, the following steps are included:

[0049] Step S1: Establishing the hybrid energy storage virtual synchronous machine rotor mechanical equation and reactive power regulation equation.

[0050] In a specific embodiment, if Figure 2 As shown in Figure 2, the distributed power source point is connected to the DC bus through a DC / DC converter, because its active output P DG Fluctuation requires the configuration of a hybrid energy storage device consisting of a battery and a supercapacitor. By adjusting the battery active power P B , supercapacitor active power P C To suppress P DGFluctuation. When a frequency oscillation accident occurs in the AC power grid, the power oscillation signal is transmitted to the DC side through the AC / DC converter, and the hybrid energy storage is required to have the ability to suppress frequency oscillation.

[0051] like Figure 3 As shown, U dc is the DC bus voltage; U abc 、i abc is the three-phase voltage and current on the AC side of the hybrid energy storage DC / AC converter; e abc is the three-phase voltage of the AC power grid; R f , L f , L g , R g In the VSG control process, ω is the virtual angular frequency; δ is the virtual power angle; P ref is the active power reference value; P e is the virtual electromagnetic power, VSG has no stator winding loss, P e Also known as VSG control output power; P m is the virtual mechanical power; u is the virtual internal potential in VSG; Q e is the actual output value of reactive power; Q ref is the reactive power reference value. The rotor mechanical equation is:

[0052]

[0053] In formula (1), H is the virtual moment of inertia; T m , T e They are VSG mechanical torque and electromagnetic torque respectively. D is the virtual damping coefficient; ω0 is the rated angular frequency; in VSG control, the virtual moment of inertia H makes the hybrid energy storage converter have inertia during the power and frequency regulation process, and the damping coefficient D makes the hybrid energy storage DC / AC converter have the ability to suppress the power oscillation of the AC grid. DC / AC converter control also has excitation regulation inertia, and the reactive power regulation equation is:

[0054]

[0055] In formula (2), U0 is the effective value of the rated voltage; Δu is the deviation between the virtual internal potential and the rated voltage; k q is the reactive power regulation coefficient.

[0056] In the embodiment of the present invention, by adopting the VSG control strategy, the inertia and damping effect similar to that of a conventional generator can be added to the hybrid energy storage converter.

[0057] Step S2: linearize and Laplace transform the state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and reactive power regulation equation, and represent them with small disturbance signals.

[0058] In a specific embodiment, in order to verify the stability of the proposed adaptive virtual damping VSG control system, this embodiment performs power frequency small signal analysis on the hybrid energy storage VSG control, linearizes and Laplace transforms the state variables in the VSG rotor mechanical equation (1) and the VSG reactive power regulation equation (2), and expresses them with a small disturbance signal to obtain:

[0059]

[0060] In formula (3): s is the Laplace operator; is the small disturbance at the DC operating point corresponding to the virtual angular frequency, virtual power angle, virtual mechanical power, and VSG output power; S e is the apparent power output by the VSG. Since δ is very small, sinδ≈δ, we can get:

[0061] Step S3: The output active power of the hybrid energy storage VSG control system is calculated based on the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation.

[0062] In a specific embodiment, the output active power of the hybrid energy storage VSG control system is calculated by the following steps:

[0063] Step S31: Calculate the transfer function equation based on the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation.

[0064] Step S32: Calculate the output active power of the hybrid energy storage VSG control system according to the transfer function equation.

[0065] The transfer function is represented by G(s):

[0066]

[0067] In formula (4), P e (s), P m (s) is the power frequency small signal model of VSG output power and virtual mechanical power in the s domain. When the frequency oscillation occurs in the hybrid energy storage, the output active power of the VSG control system is expressed as:

[0068]

[0069] In formula (5): ΔP m(s) is the industrial frequency small signal model of the virtual mechanical power change in the s domain.

[0070] Step S4: Derivative the maximum active power output by the hybrid energy storage VSG control system with respect to the virtual damping coefficient to perform stability analysis on the hybrid energy storage VSG control system.

[0071] In a specific embodiment, the maximum active power output by the hybrid energy storage VSG control system is derived from the virtual damping coefficient by the following steps to perform stability analysis of the hybrid energy storage VSG control system:

[0072] Step S41: Calculate the time domain response function of the VSG control system's output active power based on the hybrid energy storage VSG control system's output active power.

[0073] Step S42: Obtain the maximum value of active power according to the response function in the time domain of the active power output by the VSG control system.

[0074] Step S43: Derivative the maximum active power output by the hybrid energy storage VSG control system with respect to the virtual damping coefficient, and analyze the influence of the virtual damping coefficient on the output power.

[0075] Specifically, according to formula (5), we can get P e The response function in the time domain is:

[0076]

[0077] In formula (6): According to formula (6), P e The maximum value is:

[0078]

[0079] In order to analyze the effect of virtual damping coefficient D on output power P e The influence of e.max Taking the derivative of D, we can get:

[0080]

[0081] According to formula (8), when the output power of the hybrid energy storage VSG control system increases, the virtual mechanical power also increases accordingly, that is, ΔP m >0,P e.max The derivative of D is less than 0; when the output power of the hybrid energy storage VSG control system decreases, the virtual mechanical power also decreases accordingly, that is, ΔP m <0, P e.max The derivative of D is greater than 0. By adaptively adjusting D, the forward and reverse overshoot of power can be limited, and the frequency oscillation of hybrid energy storage can be further suppressed.

[0082] The hybrid energy storage VSG control system stability analysis method provided by the present invention includes: establishing a hybrid energy storage virtual synchronous machine rotor mechanical equation and a reactive power regulation equation; linearizing and Laplace transforming the state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation, and expressing them with a small disturbance signal; calculating the output active power of the hybrid energy storage VSG control system according to the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation; and performing a stability analysis of the hybrid energy storage VSG control system by deriving the virtual damping coefficient from the maximum value of the output active power of the hybrid energy storage VSG control system. By linearizing and Laplace transforming the VSG control system, the stability of the hybrid energy storage VSG control system is analyzed, and the relationship between the virtual damping and the energy storage frequency oscillation is obtained. Therefore, the hybrid energy storage frequency oscillation is suppressed according to the relationship between the virtual damping and the energy storage frequency oscillation, and the ideal effect of the hybrid energy storage VSG control system participating in the regulation is achieved.

[0083] The embodiment of the present invention provides a hybrid energy storage VSG control system stability analysis system, such as Figure 4 As shown, including:

[0084] The model building module 1 is used to build the rotor mechanical equation and reactive power regulation equation of the hybrid energy storage virtual synchronous machine. For details, please refer to the relevant description of step S1 in the above embodiment, which will not be repeated here.

[0085] The first calculation module 2 is used to linearize and Laplace transform the state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and reactive power regulation equation, and represent them with small disturbance signals. For details, please refer to the relevant description of step S2 in the above embodiment, which will not be repeated here.

[0086] The second calculation module 3 is used to calculate the output active power of the hybrid energy storage VSG control system according to the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation. For details, please refer to the relevant description of step S3 in the above embodiment, which will not be repeated here.

[0087] The third calculation module 4 is used to derive the maximum active power output by the hybrid energy storage VSG control system with respect to the virtual damping coefficient to perform stability analysis on the hybrid energy storage VSG control system. For details, please refer to the relevant description of step S4 in the above embodiment, which will not be repeated here.

[0088] The embodiment of the present invention also provides a computer device, such as Figure 5 As shown, the device may include a processor 61 and a memory 62, wherein the processor 61 and the memory 62 may be connected via a bus or other means. Figure 5 Take the example of connecting via a bus.

[0089] The processor 61 may be a central processing unit (CPU). The processor 61 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0090] The memory 62 is a non-transient computer-readable storage medium that can be used to store non-transient software programs, non-transient computer executable programs and modules, such as the corresponding program instructions / modules in the embodiment of the present invention. The processor 61 executes various functional applications and data processing of the processor by running the non-transient software programs, instructions and modules stored in the memory 62, that is, the hybrid energy storage VSG control system stability analysis method in the above method embodiment is implemented.

[0091] The memory 62 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required by at least one function; the data storage area may store data created by the processor 61, etc. In addition, the memory 62 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 62 may optionally include a memory remotely arranged relative to the processor 61, and these remote memories may be connected to the processor 61 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, an intranet, a mobile communication network, and combinations thereof.

[0092] One or more modules are stored in the memory 62, and when executed by the processor 61, the hybrid energy storage VSG control system stability analysis method provided by the embodiment of the present invention is performed.

[0093] For details of the above computer equipment, please refer to Figure 1-Figure 3 The corresponding related descriptions and effects in the illustrated embodiments can be understood and will not be repeated here.

[0094] Those skilled in the art can understand that the implementation of all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0095] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A hybrid energy storage VSG control system stability analysis method, characterized in that: include: Establish the rotor mechanical equation and reactive power regulation equation of hybrid energy storage virtual synchronous machine; The state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and reactive power regulation equation are linearized and Laplace transformed, and represented by small disturbance signals; The output active power of the hybrid energy storage VSG control system is calculated based on the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation; The maximum active power output of the hybrid energy storage VSG control system is derived from the virtual damping coefficient to perform stability analysis on the hybrid energy storage VSG control system. The method of performing a stability analysis of the hybrid energy storage VSG control system by deriving the maximum active power output of the hybrid energy storage VSG control system with respect to the virtual damping coefficient includes: According to the output active power of the hybrid energy storage VSG control system, the response function of the VSG control system output active power in the time domain is obtained; The maximum value of active power is obtained according to the response function in the time domain of the active power output of the VSG control system; The maximum active power output of the hybrid energy storage VSG control system is derived from the virtual damping coefficient to analyze the influence of the virtual damping coefficient on the output power. The response function of the VSG control system output active power in the time domain is expressed by the following formula: in, , , is the virtual mechanical power change in s The power frequency small signal model in the domain, , , H is the virtual moment of inertia, S e is the apparent power output of VSG, D is the virtual damping coefficient, is the rated angular frequency.

2. The hybrid energy storage VSG control system stability analysis method according to claim 1 is characterized in that: The hybrid energy storage VSG control system output active power is calculated based on the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation, including: The transfer function equation is calculated based on the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation; The output active power of the hybrid energy storage VSG control system is calculated according to the transfer function equation.

3. The hybrid energy storage VSG control system stability analysis method according to claim 1 is characterized in that: The small disturbance signal is expressed by the following formula: in, is the virtual angular frequency, s is the Laplace operator, P m is the virtual mechanical power, P e is the virtual electromagnetic power, δ is the virtual power angle.

4. The hybrid energy storage VSG control system stability analysis method according to claim 2 is characterized in that: The transfer function equation is expressed as follows: in, , is the VSG output power, virtual mechanical power s The power frequency small signal model in the domain.

5. The hybrid energy storage VSG control system stability analysis method according to claim 2 is characterized in that: The output active power of the hybrid energy storage VSG control system is expressed by the following formula: in, P e is the virtual electromagnetic power, VSG has no stator winding loss, P e Also known as VSG control output power, is the transfer function equation.

6. A hybrid energy storage VSG control system stability analysis system, characterized in that: include: Model building module, used to establish the rotor mechanical equation and reactive power regulation equation of the hybrid energy storage virtual synchronous machine; The first calculation module is used to linearize and Laplace transform the state variables in the hybrid energy storage virtual synchronous machine rotor mechanical equation and reactive power regulation equation, and represent them with a small disturbance signal; The second calculation module is used to calculate the output active power of the hybrid energy storage VSG control system according to the small disturbance signal model of the hybrid energy storage virtual synchronous machine rotor mechanical equation and the reactive power regulation equation; The third calculation module is used to derive the maximum active power output by the hybrid energy storage VSG control system with respect to the virtual damping coefficient, and perform stability analysis on the hybrid energy storage VSG control system; The method of performing a stability analysis of the hybrid energy storage VSG control system by deriving the maximum active power output of the hybrid energy storage VSG control system with respect to the virtual damping coefficient includes: According to the output active power of the hybrid energy storage VSG control system, the response function of the VSG control system output active power in the time domain is obtained; The maximum value of active power is obtained according to the response function in the time domain of the active power output of the VSG control system; The maximum active power output of the hybrid energy storage VSG control system is derived from the virtual damping coefficient to analyze the influence of the virtual damping coefficient on the output power. The response function of the VSG control system output active power in the time domain is expressed by the following formula: in, , , is the virtual mechanical power change in s The power frequency small signal model in the domain, , , H is the virtual moment of inertia, S e is the apparent power output of VSG, D is the virtual damping coefficient, is the rated angular frequency.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the hybrid energy storage VSG control system stability analysis method as described in any one of claims 1-5.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the hybrid energy storage VSG control system stability analysis method as described in any one of claims 1-5 by executing the computer instructions.

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