Voltage source type energy storage configuration method, system and related device

Abstract

The invention discloses a voltage source type energy storage configuration method and system and a related device, and belongs to the technical field of energy storage. The method comprises the following steps: respectively establishing impedance models of a wind and light storage power generation cluster, a transformer and an alternating current power grid, and obtaining an impedance per unit value based on aggregated impedance; constructing an equivalent short-circuit ratio of the new energy cluster system containing voltage source type energy storage based on the impedance per unit value, and representing a stable operation limit of the new energy cluster system by a critical equivalent short-circuit ratio; determining the relation between the voltage source type energy storage configuration proportion and the critical equivalent short-circuit ratio of operation of the new energy cluster system; and according to the equivalent impedance of the power grid under different working conditions and the external characteristic parameters of the new energy cluster system, the optimal configuration proportion of the new energy cluster system distribution and storage under different working conditions is determined. The method is used for evaluating the stable operation limit of voltage source type energy storage on a new energy cluster system and performing optimal configuration on the voltage source type energy storage.

Description

Technical Field

[0001] The present invention provides a voltage source type energy storage configuration method, system and related devices, belonging to the field of energy storage technology. Background Art

[0002] Energy storage technology is often used in photovoltaic, wind power and other renewable energy power generation scenarios to reduce the impact of renewable energy power generation volatility, intermittency and randomness on the power grid. At present, new energy stations mostly adopt grid-following control strategies, which are prone to wide-band oscillation under weak power grid conditions and are difficult to operate stably. In addition, they have no ability to support the power grid when the power grid oscillates or fails. By incorporating a voltage source energy storage system into the new energy cluster system, the stable operation limit of the entire system can be improved and the stability of the system can be improved. If the voltage source energy storage is used to improve the stable operation limit of the new energy cluster system, the configuration of the energy storage system can be optimized, and the energy storage resources can be reasonably allocated and fully utilized in the power system to improve the economy of the entire system. However, there are currently few studies on the quantitative evaluation method of voltage source energy storage to improve the stable operation limit of the new energy cluster system and the optimal configuration of energy storage.

[0003] At present, the energy storage of new energy cluster systems is mainly due to the relevant mandatory storage policy regulations of various provinces, and the proportions stipulated by various provinces are mostly concentrated in 10%-20% and 2h. At present, most of the photovoltaic and wind storage projects put into operation are current source energy storage. The current source energy storage system has small inertia and damping, cannot support the voltage and frequency of the power grid, and is difficult to adapt to the operating conditions under weak power grid conditions. Although there are a number of voltage source energy storage demonstration projects under construction or already put into operation, the evaluation technology for the role of voltage source energy storage in improving the limit of stable operation of new energy cluster systems is still immature. The existing research results show that the critical short-circuit ratio of new energy cluster systems can be improved after voltage source energy storage is connected to the power grid, but there is a lack of quantitative description of the relationship between the proportion of voltage source energy storage investment and the role of improving the limit of stable operation of new energy cluster systems, and there is a lack of clear definition of the optimal configuration of energy storage. Summary of the invention

[0004] In order to improve the operating stability limit of the new energy cluster system under the weak power grid operation state, it is necessary to integrate voltage source energy storage into the new energy cluster system. The present invention proposes a voltage source energy storage configuration method, system and related devices, which are used to evaluate the stable operating limit of the voltage source energy storage on the new energy cluster system and optimize the configuration of the voltage source energy storage.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention provides a voltage source type energy storage configuration method, comprising:

[0007] Impedance models of wind, solar, and storage power generation clusters, transformers, and AC power grids are established respectively, and the impedance models of wind, solar, and storage power generation clusters, transformers, and AC power grids are aggregated to obtain the aggregate impedance of the new energy cluster system, and the impedance per unit value is obtained based on the aggregate impedance;

[0008] Based on the impedance per unit value, an equivalent short-circuit ratio of a new energy cluster system including a voltage source type energy storage is constructed, and the equivalent short-circuit ratio corresponding to a stable state and an unstable state of the new energy cluster system is selected as the critical equivalent short-circuit ratio of the operation of the new energy cluster system; a first relationship between the configuration ratio of the voltage source type energy storage and the critical equivalent short-circuit ratio of the operation of the new energy cluster system is determined;

[0009] According to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and combined with the first relationship between the configuration proportion of voltage source energy storage and the critical equivalent short-circuit ratio, the optimal configuration ratio of the new energy cluster system storage is determined, and the energy storage of the new energy cluster system is configured based on the optimal configuration ratio.

[0010] As a further improvement of the present invention, the impedance models of the wind-solar-storage power generation cluster, the transformer and the AC power grid are established respectively, the impedance models of the wind-solar-storage power generation cluster, the transformer and the AC power grid are aggregated to obtain the aggregate impedance of the new energy cluster system, and the impedance per unit value is obtained based on the aggregate impedance, including:

[0011] The impedance model of wind, solar and energy storage power generation cluster is established based on the harmonic linearization method;

[0012] Establish the impedance model of the transformer in the new energy cluster system and the impedance model of the AC power grid;

[0013] The impedance models of wind, solar and storage power generation clusters, transformers and AC power grids are aggregated to obtain the aggregated impedance. The aggregated impedance is used as the impedance model of the new energy cluster system, and the impedance per unit value of the new energy cluster system impedance is calculated.

[0014] As a further improvement of the present invention, the equivalent short-circuit ratio of the new energy cluster system including voltage source type energy storage is constructed based on the impedance per unit value, including:

[0015] The reciprocal of the per-unit impedance value of the new energy cluster system is taken as the equivalent short-circuit ratio of the new energy cluster system containing voltage source energy storage.

[0016] As a further improvement of the present invention, the critical equivalent short-circuit ratio is used to characterize the stable operation limit of the new energy cluster system, and specifically characterizes that the new energy cluster system is in a critical state between a stable state and an unstable state.

[0017] As a further improvement of the present invention, the first relationship between the proportion of voltage source type energy storage configuration and the critical equivalent short-circuit ratio of the operation of the new energy cluster system is determined by simulation.

[0018] As a further improvement of the present invention, the optimal configuration ratio of the new energy cluster system storage is determined according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and in combination with the first relationship between the voltage source type energy storage configuration ratio and the critical equivalent short circuit ratio, including:

[0019] According to the impedance model of the new energy cluster system, the equivalent impedance of the power grid under different working conditions is determined. According to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, combined with the first relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio, the optimal configuration ratio of the new energy cluster system storage under different working conditions is determined.

[0020] As a further improvement of the present invention, the voltage source type energy storage configuration ratio is obtained by the following method:

[0021] The configuration ratio of voltage source energy storage is changed with a preset change amount as the step size to form a variety of working conditions;

[0022] The scenarios under each working condition are simulated and analyzed separately. The proportion of voltage source energy storage configuration is kept unchanged in the scenarios under each working condition. The equivalent short-circuit ratio of the new energy cluster system is changed by changing the equivalent impedance of the power grid. The change step of the equivalent short-circuit ratio is set. The method of the root locus of the eigenvalue of the new energy cluster system is used to analyze the influence of different equivalent short-circuit ratios on the oscillation mode of the new energy cluster system, so as to determine the critical equivalent short-circuit ratio under each working condition.

[0023] After analyzing the impact of the equivalent short-circuit ratio under all working conditions on the oscillation mode of the new energy cluster system one by one, the critical equivalent short-circuit ratio under each working condition is obtained, and then the proportion of voltage source energy storage configuration is obtained.

[0024] As a further improvement of the present invention, it also includes:

[0025] Constructing state space models of a new energy cluster system and a voltage source energy storage system respectively, and obtaining an overall small signal model of the new energy cluster system according to the state space models;

[0026] Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration.

[0027] As a further improvement of the present invention, the state space models of the new energy cluster system and the voltage source energy storage are constructed respectively, and the overall small signal model of the new energy cluster system is obtained according to the state space model, including:

[0028] A state space model is established for the voltage source energy storage power station, and a linearized small signal model of the voltage source energy storage power station is obtained according to the state space model;

[0029] The new energy cluster system in the station includes photovoltaic power stations and wind farms. The photovoltaic power stations and wind farms are modeled using equivalent machines to obtain linearized small signal models of the photovoltaic power stations and wind farms respectively.

[0030] Construct a linearized small signal model of the AC power grid;

[0031] The linearized small signal models of the voltage source energy storage power station, photovoltaic power station, wind farm and AC power grid are modeled as a whole to obtain the overall small signal model of the new energy cluster system.

[0032] As a further improvement of the present invention, based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of the voltage source type energy storage configuration, including:

[0033] By applying a step response to the overall small signal model under different working conditions, the corresponding new energy cluster system damping can be obtained;

[0034] The proportion of fixed voltage source energy storage configuration remains unchanged, and the equivalent short-circuit ratio is adjusted by changing the equivalent impedance of the power grid until the oscillation damping of the new energy cluster system is 0; to determine the critical equivalent short-circuit ratio corresponding to different proportions of voltage source energy storage configuration, and to obtain the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system;

[0035] The energy storage configuration of the new energy cluster system is verified based on the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio.

[0036] In a second aspect, the present invention provides a voltage source type energy storage configuration system, comprising:

[0037] An impedance model building module is used to respectively build impedance models of a wind-solar-storage power generation cluster, a transformer and an AC power grid, aggregate the impedance models of the wind-solar-storage power generation cluster, the transformer and the AC power grid to obtain an aggregate impedance of the new energy cluster system, and obtain an impedance per unit value based on the aggregate impedance;

[0038] An equivalent short-circuit ratio construction module is used to construct an equivalent short-circuit ratio of a new energy cluster system containing a voltage source type energy storage based on the impedance per unit value, select the equivalent short-circuit ratio corresponding to the new energy cluster system being in a stable state and an unstable state as the critical equivalent short-circuit ratio of the operation of the new energy cluster system; determine a first relationship between the configuration ratio of the voltage source type energy storage and the critical equivalent short-circuit ratio of the operation of the new energy cluster system;

[0039] The optimal configuration ratio determination module is used to determine the optimal configuration ratio of the new energy cluster system according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and in combination with the first relationship between the voltage source type energy storage configuration ratio and the critical equivalent short-circuit ratio, and configure the new energy cluster system energy storage based on the optimal configuration ratio.

[0040] As a further improvement of the present invention, in the impedance model establishment module, impedance models of the wind, solar, and storage power generation cluster, the transformer, and the AC power grid are established respectively, and the impedance models of the wind, solar, and storage power generation cluster, the transformer, and the AC power grid are aggregated to obtain the aggregated impedance of the new energy cluster system, and the impedance per unit value is obtained based on the aggregated impedance, including:

[0041] The impedance model of wind, solar and energy storage power generation cluster is established based on the harmonic linearization method;

[0042] Establish the impedance model of the transformer in the new energy cluster system and the impedance model of the AC power grid;

[0043] The impedance models of wind, solar and storage power generation clusters, transformers and AC power grids are aggregated to obtain the aggregated impedance. The aggregated impedance is used as the impedance model of the new energy cluster system, and the impedance per unit value of the new energy cluster system impedance is calculated.

[0044] As a further improvement of the present invention, in the equivalent short-circuit ratio construction module, the equivalent short-circuit ratio of the new energy cluster system including voltage source type energy storage is constructed based on the impedance per unit value, including:

[0045] The reciprocal of the per-unit impedance value of the new energy cluster system is taken as the equivalent short-circuit ratio of the new energy cluster system containing voltage source energy storage.

[0046] As a further improvement of the present invention, the critical equivalent short-circuit ratio is used to characterize the stable operation limit of the new energy cluster system, and specifically characterizes that the new energy cluster system is in a critical state between a stable state and an unstable state.

[0047] As a further improvement of the present invention, the first relationship between the proportion of voltage source type energy storage configuration and the critical equivalent short-circuit ratio of the operation of the new energy cluster system is determined by simulation.

[0048] As a further improvement of the present invention, in the optimal configuration ratio determination module, the optimal configuration ratio of the new energy cluster system is determined according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and in combination with the first relationship between the voltage source type energy storage configuration ratio and the critical equivalent short circuit ratio, including:

[0049] According to the impedance model of the new energy cluster system, the equivalent impedance of the power grid under different working conditions is determined. According to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, combined with the first relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio, the optimal configuration ratio of the new energy cluster system storage under different working conditions is determined.

[0050] As a further improvement of the present invention, the voltage source type energy storage configuration ratio is obtained by the following method:

[0051] The configuration ratio of voltage source energy storage is changed with a preset change amount as the step size to form a variety of working conditions;

[0052] The scenarios under each working condition are simulated and analyzed separately. The proportion of voltage source energy storage configuration is kept unchanged in the scenarios under each working condition. The equivalent short-circuit ratio of the new energy cluster system is changed by changing the equivalent impedance of the power grid. The change step of the equivalent short-circuit ratio is set. The method of the root locus of the eigenvalue of the new energy cluster system is used to analyze the influence of different equivalent short-circuit ratios on the oscillation mode of the new energy cluster system, so as to determine the critical equivalent short-circuit ratio under each working condition.

[0053] After analyzing the impact of the equivalent short-circuit ratio under all working conditions on the oscillation mode of the new energy cluster system one by one, the critical equivalent short-circuit ratio under each working condition is obtained, and then the proportion of voltage source energy storage configuration is obtained.

[0054] As a further improvement of the present invention, it also includes an energy storage configuration verification module for:

[0055] Constructing state space models of a new energy cluster system and a voltage source energy storage system respectively, and obtaining an overall small signal model of the new energy cluster system according to the state space models;

[0056] Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration.

[0057] As a further improvement of the present invention, the state space models of the new energy cluster system and the voltage source energy storage are constructed respectively, and the overall small signal model of the new energy cluster system is obtained according to the state space model, including:

[0058] A state space model is established for the voltage source energy storage power station, and a linearized small signal model of the voltage source energy storage power station is obtained according to the state space model;

[0059] The new energy cluster system in the station includes photovoltaic power stations and wind farms. The photovoltaic power stations and wind farms are modeled using equivalent machines to obtain linearized small signal models of the photovoltaic power stations and wind farms respectively.

[0060] Construct a linearized small signal model of the AC power grid;

[0061] The linearized small signal models of the voltage source energy storage power station, photovoltaic power station, wind farm and AC power grid are modeled as a whole to obtain the overall small signal model of the new energy cluster system.

[0062] As a further improvement of the present invention, based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of the voltage source type energy storage configuration, including:

[0063] By applying a step response to the overall small signal model under different working conditions, the corresponding new energy cluster system damping can be obtained;

[0064] The proportion of fixed voltage source energy storage configuration remains unchanged, and the equivalent short-circuit ratio is adjusted by changing the equivalent impedance of the power grid until the oscillation damping of the new energy cluster system is 0; to determine the critical equivalent short-circuit ratio corresponding to different proportions of voltage source energy storage configuration, and to obtain the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system;

[0065] The energy storage configuration of the new energy cluster system is verified based on the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio.

[0066] In a third aspect, the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the voltage source type energy storage configuration method is implemented when the processor executes the computer program.

[0067] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the voltage source type energy storage configuration method is implemented.

[0068] In a fifth aspect, the present invention provides a computer program product, which includes computer instructions, characterized in that the computer instructions instruct a computer to execute the voltage source energy storage configuration method.

[0069] The beneficial effects of the present invention compared with the prior art are as follows:

[0070] The present invention constructs impedance models of wind, solar, storage and power generation clusters, transformers and AC power grids respectively. These impedance models are aggregated to form the overall aggregate impedance of the new energy cluster system. The impedance per unit value is calculated based on the aggregate impedance. The impedance per unit value is then used to construct the equivalent short circuit ratio (ESCR) of the new energy cluster system including voltage source energy storage. The equivalent short circuit ratio of the new energy cluster system between the stable and unstable states is identified and selected as the critical equivalent short circuit ratio. The first relationship between the voltage source energy storage configuration ratio and the critical equivalent short circuit ratio is determined. The equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions are considered. Combined with the relationship between the voltage source energy storage configuration ratio and the critical equivalent short circuit ratio, the optimal configuration ratio of the energy storage of the new energy cluster system is determined. Based on the optimal configuration ratio, the energy storage of the new energy cluster system is configured. Through accurate impedance model and equivalent short circuit ratio analysis, a scientific energy storage configuration scheme is provided for the new energy cluster system to ensure the stable operation of the system under different working conditions. By accurately and timely evaluating the voltage source type energy storage to improve the stable operation limit of the new energy cluster system, thereby optimizing the voltage source type energy storage configuration, it is possible to reasonably allocate and fully utilize energy storage resources in the new energy cluster system, thereby improving the economy of the new energy cluster system. When the new energy cluster system is connected to a weak power grid, it does not have an inertia support function. Configuring voltage source type energy storage can improve the frequency support and voltage support capabilities of the new energy cluster system for the new energy cluster system. The method proposed in the present invention for evaluating the effect of voltage source type energy storage on improving the operating stability limit of the new energy cluster system can clarify the quantitative relationship between the configuration ratio of voltage source type energy storage and the operating stability limit of the new energy cluster system, thereby calculating the optimal configuration ratio of the new energy cluster system under different operating conditions, so that the power resources of the new energy cluster system can be optimally configured, thereby improving the economic benefits of the entire new energy cluster system. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the embodiments of the present invention or the drawings of related technical solutions in the prior art are introduced below. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0072] Figure 1 A flow chart of a voltage source type energy storage configuration method provided by the present invention;

[0073] Figure 2 It is a schematic diagram of the new energy cluster system and voltage source energy storage power station;

[0074] Figure 3 It is a schematic diagram of the state space structure of the voltage source energy storage and new energy cluster system;

[0075] Figure 4 Impedance model for voltage source energy storage and new energy cluster system;

[0076] Figure 5 This is a schematic diagram of the relationship between the voltage source energy storage configuration ratio and CESCR;

[0077] Figure 6 A voltage source type energy storage configuration system provided by the present invention;

[0078] Figure 7 A schematic diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0079] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0080] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0081] Terminology explanation:

[0082] CESCR, the Committee on Economic, Social and Cultural Rights, is the main body within the United Nations system responsible for overseeing the implementation of the International Covenant on Economic, Social and Cultural Rights (ICESCR).

[0083] The present invention relates to a voltage source energy storage configuration method taking into account the stable operation limit of a wind, solar, and storage power generation cluster, and is mainly aimed at researching and demonstrating the adaptability of voltage source energy storage to improve the operation of new energy stations connected to weak power grids.

[0084] like Figure 1 As shown, the present invention provides a voltage source type energy storage configuration method, comprising the following steps:

[0085] S100, respectively establishing impedance models of a wind, solar, and storage power generation cluster, a transformer, and an AC power grid, aggregating the impedance models of the wind, solar, and storage power generation cluster, the transformer, and the AC power grid to obtain an aggregated impedance of a new energy cluster system, and obtaining an impedance per unit value based on the aggregated impedance;

[0086] S200, constructing an equivalent short-circuit ratio of a new energy cluster system including a voltage source type energy storage system based on the impedance per unit value, selecting an equivalent short-circuit ratio corresponding to a stable state and an unstable state of the new energy cluster system as a critical equivalent short-circuit ratio for operation of the new energy cluster system; determining a first relationship between a configuration ratio of the voltage source type energy storage and a critical equivalent short-circuit ratio for operation of the new energy cluster system;

[0087] S300, according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and in combination with the first relationship between the configuration proportion of the voltage source type energy storage and the critical equivalent short-circuit ratio, the optimal configuration ratio of the energy storage of the new energy cluster system is determined, and the energy storage of the new energy cluster system is configured based on the optimal configuration ratio.

[0088] The method proposed in the present invention for evaluating the effect of voltage source type energy storage on improving the stable operation limit of the new energy cluster system is to establish the overall state space model of the new energy cluster system by equivalently simplifying the same type of units with a single equivalent machine, and to define the stable operation limit of the new energy cluster system with the critical equivalent short circuit ratio, so as to use the simulation method to analyze the relationship between the configuration ratio of voltage source type energy storage and the stable operation limit of the new energy cluster system. After obtaining the relationship between the configuration ratio of voltage source type energy storage and the stable operation limit of the new energy cluster system, in engineering applications, it is possible to configure a suitable proportion of energy storage power stations according to the actual operating conditions of the new energy cluster system, realize the economic configuration of energy storage, and avoid the waste of energy storage resources caused by fixed proportion storage.

[0089] As an example, the impedance models of the wind, solar, and storage power generation clusters, transformers, and AC power grids are established respectively, the impedance models of the wind, solar, and storage power generation clusters, transformers, and AC power grids are aggregated to obtain the aggregate impedance of the new energy cluster system, and the impedance per unit value is obtained based on the aggregate impedance, including:

[0090] Establish the impedance model of the transformer in the new energy cluster system and the impedance model of the AC power grid;

[0091] The impedance model of the transformer and the impedance model of the AC power grid are aggregated to obtain the aggregated impedance, which is used as the impedance model of the new energy cluster system.

[0092] As a further example, constructing the equivalent short-circuit ratio of the new energy cluster system including voltage source energy storage based on the impedance per unit value includes: taking the inverse of the impedance per unit value of the new energy cluster system as the equivalent short-circuit ratio of the new energy cluster system including voltage source energy storage.

[0093] As an example, characterizing the stable operation limit of the new energy cluster system by the critical equivalent short-circuit ratio means using the critical equivalent short-circuit ratio to describe the stable operation limit of the new energy cluster system. At the critical equivalent short-circuit ratio, the new energy cluster system is in a critical state between a stable state and an unstable state.

[0094] As a preferred solution, the relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system operation is determined, including:

[0095] Determine the relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the operation of the new energy cluster system through simulation;

[0096] The proportion of voltage source energy storage configuration changes from 0% to 100% with a preset change amount as the step size to form a variety of working conditions;

[0097] The scenarios under each working condition are simulated and analyzed separately. In each working condition, the proportion of fixed voltage source energy storage configuration remains unchanged. The equivalent short-circuit ratio of the new energy cluster system is changed by changing the equivalent impedance of the power grid. The change step of the equivalent short-circuit ratio is set. The method of eigenvalue root locus of the new energy cluster system is used to analyze the influence of different equivalent short-circuit ratios on the oscillation mode of the new energy cluster system, so as to determine the critical equivalent short-circuit ratio under each working condition.

[0098] After analyzing the impact of the equivalent short-circuit ratio under all working conditions on the oscillation mode of the new energy cluster system one by one, the critical equivalent short-circuit ratio under each working condition is obtained, and then the proportion of voltage source energy storage configuration is obtained.

[0099] The evaluation method for improving the stable operation limit of a new energy cluster system by using voltage source energy storage based on the state space method and the impedance model proposed in the present invention can more accurately describe the relationship between the configuration proportion of voltage source energy storage and the CESCR of the new energy cluster system through simulation, thereby quantitatively describing the effect of voltage source energy storage on improving the stable operation limit of the new energy cluster system.

[0100] Furthermore, the optimal configuration ratio of the energy cluster system storage under different working conditions is determined according to the equivalent impedance of the power grid and the external characteristic parameters of the energy cluster system under different working conditions, including:

[0101] According to the impedance model of the new energy cluster system, the equivalent impedance of the power grid under different working conditions is determined. According to the equivalent impedance of the power grid under different working conditions and the external characteristic parameters of the new energy cluster system, the optimal configuration ratio of energy storage is determined by combining the relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio.

[0102] On this basis, the present invention proposes a method for optimizing the configuration of energy storage to improve the economy of the new energy cluster system.

[0103] In addition, the present invention also proposes to use the minimum oscillation damping under different working conditions to describe the oscillation damping of the new energy cluster system and use the oscillation damping to verify the above conclusion. Therefore, the above method also includes:

[0104] Constructing state space models of a new energy cluster system and a voltage source energy storage system respectively, and obtaining an overall small signal model of the new energy cluster system according to the state space models;

[0105] Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration.

[0106] in,

[0107] The state space models of the new energy cluster system and the voltage source energy storage are constructed respectively, and the overall small signal model of the new energy cluster system is obtained according to the state space model, including:

[0108] A state space model is established for the voltage source energy storage power station, and a linearized small signal model of the voltage source energy storage power station is obtained according to the state space model;

[0109] The new energy cluster system in the station includes photovoltaic power stations and wind farms. The photovoltaic power stations and wind farms are modeled using equivalent machines to obtain linearized small signal models of the photovoltaic power stations and wind farms respectively.

[0110] Construct a linearized small signal model of the AC power grid;

[0111] The linearized small signal models of the voltage source energy storage power station, photovoltaic power station, wind farm and AC power grid are modeled as a whole to obtain the overall small signal model of the new energy cluster system.

[0112] Furthermore, based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of the voltage source type energy storage configuration, including:

[0113] Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration, including:

[0114] By applying a step response to the overall small signal model under different working conditions, the corresponding new energy cluster system damping can be obtained;

[0115] The proportion of fixed voltage source energy storage configuration remains unchanged, and the equivalent short-circuit ratio is adjusted by changing the equivalent impedance of the power grid until the oscillation damping of the new energy cluster system is 0; to determine the critical equivalent short-circuit ratio corresponding to different proportions of voltage source energy storage configuration, and to obtain the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system;

[0116] The energy storage configuration of the new energy cluster system is verified based on the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio.

[0117] The present invention proposes to establish an impedance model of a new energy cluster system and based on a small signal model, use the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration to verify the conclusion drawn by the simulation method based on the state space method.

[0118] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0119] like Figure 2 As shown, it is a schematic diagram of a new energy cluster system and a voltage source energy storage power station; an evaluation method and its optimization configuration of the voltage source energy storage on the limit of the operation stability of the new energy cluster system include the following steps:

[0120] Step 1: Construct the state space models of the new energy cluster system and the voltage source energy storage respectively, obtain the overall small signal model of the new energy cluster system, and establish the impedance model of the new energy cluster system;

[0121] Step 2: Define the equivalent short-circuit ratio of the new energy cluster system containing voltage source energy storage to define the stable operation limit of the new energy cluster system;

[0122] Step 3: Simulate and determine the relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system operation;

[0123] Step 4: Determine the optimal configuration ratio of the new energy cluster system storage under different working conditions;

[0124] Step 5: Based on the small signal model, verify the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration.

[0125] The control method is described in detail below in combination with specific implementation steps:

[0126] Step 1: Construct the state space models of the new energy cluster system and the voltage source energy storage respectively, obtain the overall small signal model of the new energy cluster system, and establish the impedance model of the new energy cluster system.

[0127] This embodiment takes a virtual synchronous generator (VSG) as an example, as the main control unit of a voltage source energy storage power station, and constructs a VSG control equation:

[0128]

[0129] Where P ref , U ref are the command values ​​of active power and output voltage, respectively, and are P m is the mechanical power of the simulated rotor, P e is the electromagnetic power, ω is the rotor angular frequency, J is the inertia constant, K ω is the inverse of the active power-frequency droop coefficient, K q It is the reciprocal of the reactive power-voltage droop coefficient.

[0130] The VSG control equation is established as a state space model, and the input, state and output are:

[0131] U E =[P ref , U ref , Q ref ,ω ref , P e , Q], X E =[θ,ω],Y E =[θ,U].

[0132] Therefore, the linearized small signal model of the voltage source energy storage power station can be obtained as follows:

[0133]

[0134] 2) In order to avoid the dimensional disaster caused by too many units, it is assumed that the units of the same type in the station have the same output. The present invention assumes the new energy cluster system in the station to be a photovoltaic power station and a wind farm, and uses equivalent machines to model the photovoltaic power station and wind farm respectively.

[0135] The wind farm is modeled using a doubly-fed wind turbine (DFIG). The DFIG includes modules such as the rotor-side converter, the grid-side converter, and the phase-locked loop. The input and output quantities are U D =[U sd , U sq ],Y D =[i sd ,i sq ],U D Indicates the voltage between the wind farm inverter outlet and the AC system interface, Y D Represents the interface current between the inverter outlet of the wind farm and the AC system, and obtains the linearized small signal model of the doubly fed wind turbine, that is, the linearized small signal model of the wind farm, which is specifically:

[0136]

[0137] The photovoltaic power station includes a DC capacitor voltage control loop, a phase-locked loop, and a filter circuit module. The input and output quantities are X P =[i pd ,i pq ],Y P =[U pd , U pq ], where X P Indicates the current between the inverter outlet of the photovoltaic power station and the AC system interface, Y P Represents the voltage between the inverter outlet of the photovoltaic power station and the AC system interface, and the linearized small signal model of the photovoltaic power station is obtained as follows:

[0138]

[0139] Construct a linearized small signal model of the AC power grid, specifically:

[0140]

[0141] The linearized small signal models of the voltage source energy storage power station, photovoltaic power station, wind farm and AC power grid mentioned above are integrally modeled to obtain an overall small signal model of the new energy cluster system.

[0142] Figure 3 It is a schematic diagram of the state space structure of the voltage source energy storage and new energy cluster system;

[0143] Then, the impedance model transformer of the new energy cluster system and the impedance model Z of the AC power grid are established. T ,Z g They are:

[0144]

[0145] Since the present invention assumes that the output of the same type of units in the station is the same, that is, one equivalent unit is used to simulate the small signal dynamic characteristics of the same station, the aggregate impedance Z∑ can be simplified as:

[0146]

[0147] Among them, ∥ represents parallel operation. Thus, the impedance model of the new energy cluster system can be obtained.

[0148] Figure 4 It is the impedance model of voltage source energy storage and new energy cluster system.

[0149] Step 2: Define the equivalent short-circuit ratio of the new energy cluster system containing voltage source energy storage to define the stable operation limit of the new energy cluster system.

[0150] The equivalent short-circuit ratio of the new energy cluster system with voltage source energy storage is defined as the impedance per unit value Z of the new energy cluster system pu The reciprocal of:

[0151]

[0152] Among them, Z pu It can be calculated by the impedance model established in step 1. The present invention chooses to use the critical equivalent short circuit ratio (CESCR) to describe the stable operation limit of the new energy cluster system, which means that at the critical equivalent short circuit ratio, the new energy cluster system is in a critical state between a stable state and an unstable state.

[0153] Step 3: Simulate and determine the relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system operation.

[0154] The present invention selects matlab / simulink as the simulation platform, and the proportion of voltage source energy storage configuration changes from 0% to 100% in steps of 5%, including a total of 21 working conditions. The present invention simulates and analyzes the scenarios under each working condition separately, fixes the proportion of voltage source energy storage configuration in each working condition scenario, changes the equivalent short circuit ratio (ESCR) of the new energy cluster system by changing the equivalent impedance of the power grid, and makes the change step of ESCR 0.1. The method of eigenvalue root trajectory of the new energy cluster system is used to analyze the influence of different ESCRs on the oscillation mode of the new energy cluster system to determine the CESCR under each working condition.

[0155] For example: ESCR changes from high to low with a step size of 0.1, simulate the impact of ESCR changes on the oscillation mode of the new energy cluster system, draw the root locus change diagram, and find the ESCR when the new energy cluster system is critically stable, that is, CESCR. The root locus change diagram has two coordinate axes, the real axis and the imaginary axis. When the eigenvalue is on the left side of the imaginary axis, the new energy cluster system is in a stable state. If the characteristic root of the new energy cluster system is just on the left side of the imaginary axis when ESCR is a, then the CESCR value is a.

[0156] After analyzing the influence of ESCR under 21 working conditions on the oscillation mode of the new energy cluster system one by one, the CESCR under each working condition is obtained, and then the present invention can draw the proportion of voltage source energy storage configuration, such as Figure 5 As shown, this is a schematic diagram of the relationship between the proportion of voltage source energy storage configuration and CESCR.

[0157] Step 4: Determine the optimal configuration ratio of energy storage for new energy cluster systems under different working conditions.

[0158] After obtaining the relationship between the configuration ratio of voltage source energy storage and CESCR, the minimum configuration ratio of energy storage can be determined according to the above relationship diagram based on the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, so as to configure appropriate energy storage for the voltage source energy storage and improve the economy of the new energy cluster system while ensuring the stability of the new energy cluster system.

[0159] Step 5: Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified using the relationship between the oscillation damping of the new energy cluster system and the proportion of the voltage source energy storage configuration.

[0160] Based on the overall small signal model of the new energy cluster system established in step 1 based on the state space method, the oscillation damping of the new energy cluster system under different working conditions can be obtained more quickly and conveniently. By applying a step response to the small signal model under different working conditions, the corresponding new energy cluster system damping can be obtained. The oscillation damping of the new energy cluster system is expressed as:

[0161] σ(ESCR, P_VSCES)=min(σ k (ESCR, P_VSCES)

[0162] Wherein, P_VSCES represents the proportion of voltage source energy storage configuration, k represents the mode, and the present invention defines the oscillation damping of the new energy cluster system as the minimum oscillation damping in all modes under a certain working condition.

[0163] The proportion of fixed voltage source energy storage configuration remains unchanged, that is, P_VSCES remains unchanged, and the ESCR is adjusted by changing the equivalent impedance of the power grid until σ(ESCR, P_VSCES) = 0. In this way, the CESCR corresponding to different P_VSCES is determined, and the second relationship between the proportion of voltage source energy storage configuration and the CESCR of the new energy cluster system is obtained.

[0164] Therefore, the present invention uses state space method, impedance model and simulation method to evaluate the voltage source energy storage for the improvement of the stable operation limit of the new energy cluster system. Based on the proposed evaluation method, the configuration ratio of the voltage source energy storage is optimized.

[0165] Finally, the proposed evaluation method is verified by using the oscillation damping of the new energy cluster system.

[0166] like Figure 6 As shown, the second object of the present invention is to provide a voltage source type energy storage configuration system, comprising:

[0167] The impedance model building module 100 is used to respectively build impedance models of the wind-solar-storage power generation cluster, the transformer and the AC power grid, aggregate the impedance models of the wind-solar-storage power generation cluster, the transformer and the AC power grid to obtain the aggregate impedance of the new energy cluster system, and obtain the impedance per unit value based on the aggregate impedance;

[0168] An equivalent short-circuit ratio construction module 200 is used to construct an equivalent short-circuit ratio of a new energy cluster system including voltage source type energy storage based on the impedance per unit value, and to characterize the stable operation limit of the new energy cluster system with a critical equivalent short-circuit ratio;

[0169] The optimal configuration ratio determination module 300 is used to determine the relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system operation; and according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, determine the optimal configuration ratio of the new energy cluster system under different working conditions, and configure the new energy cluster system energy storage based on the optimal configuration ratio.

[0170] As a further improvement, the system of the present invention further includes a verification module, which is used to:

[0171] The state space models of the new energy cluster system and voltage source energy storage are constructed respectively, and then the overall small signal model of the new energy cluster system is obtained;

[0172] Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration.

[0173] The system is based on the above-mentioned voltage source type energy storage configuration method.

[0174] Further improvement, in the impedance model establishment module, impedance models of wind, solar, and storage power generation clusters, transformers, and AC power grids are established respectively, and the impedance models of wind, solar, and storage power generation clusters, transformers, and AC power grids are aggregated to obtain the aggregate impedance of the new energy cluster system, and the impedance per unit value is obtained based on the aggregate impedance, including:

[0175] The impedance model of wind, solar and energy storage power generation cluster is established based on the harmonic linearization method;

[0176] Establish the impedance model of the transformer in the new energy cluster system and the impedance model of the AC power grid;

[0177] The impedance models of wind, solar and storage power generation clusters, transformers and AC power grids are aggregated to obtain the aggregated impedance. The aggregated impedance is used as the impedance model of the new energy cluster system, and the impedance per unit value of the new energy cluster system impedance is calculated.

[0178] As an example, in the equivalent short-circuit ratio construction module, the equivalent short-circuit ratio of the new energy cluster system including voltage source type energy storage is constructed based on the impedance per unit value, including:

[0179] The reciprocal of the per-unit impedance value of the new energy cluster system is taken as the equivalent short-circuit ratio of the new energy cluster system containing voltage source energy storage.

[0180] As an example, in the optimal configuration ratio determination module, the optimal configuration ratio of the new energy cluster system is determined according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and in combination with the first relationship between the voltage source type energy storage configuration ratio and the critical equivalent short circuit ratio, including:

[0181] According to the impedance model of the new energy cluster system, the equivalent impedance of the power grid under different working conditions is determined. According to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, combined with the first relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio, the optimal configuration ratio of the new energy cluster system storage under different working conditions is determined.

[0182] As an example, the voltage source energy storage configuration ratio is obtained by the following method:

[0183] The configuration ratio of voltage source energy storage is changed with a preset change amount as the step size to form a variety of working conditions;

[0184] The scenarios under each working condition are simulated and analyzed separately. The proportion of voltage source energy storage configuration is kept unchanged in the scenarios under each working condition. The equivalent short-circuit ratio of the new energy cluster system is changed by changing the equivalent impedance of the power grid. The change step of the equivalent short-circuit ratio is set. The method of the root locus of the eigenvalue of the new energy cluster system is used to analyze the influence of different equivalent short-circuit ratios on the oscillation mode of the new energy cluster system, so as to determine the critical equivalent short-circuit ratio under each working condition.

[0185] After analyzing the impact of the equivalent short-circuit ratio under all working conditions on the oscillation mode of the new energy cluster system one by one, the critical equivalent short-circuit ratio under each working condition is obtained, and then the proportion of voltage source energy storage configuration is obtained.

[0186] As a further example of the present invention, it further includes an energy storage configuration verification module for:

[0187] Constructing state space models of a new energy cluster system and a voltage source energy storage system respectively, and obtaining an overall small signal model of the new energy cluster system according to the state space models;

[0188] Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration.

[0189] As a further improvement of the present invention, the state space models of the new energy cluster system and the voltage source energy storage are constructed respectively, and the overall small signal model of the new energy cluster system is obtained according to the state space model, including:

[0190] A state space model is established for the voltage source energy storage power station, and a linearized small signal model of the voltage source energy storage power station is obtained according to the state space model;

[0191] The new energy cluster system in the station includes photovoltaic power stations and wind farms. The photovoltaic power stations and wind farms are modeled using equivalent machines to obtain linearized small signal models of the photovoltaic power stations and wind farms respectively.

[0192] Construct a linearized small signal model of the AC power grid;

[0193] The linearized small signal models of the voltage source energy storage power station, photovoltaic power station, wind farm and AC power grid are modeled as a whole to obtain the overall small signal model of the new energy cluster system.

[0194] Among them, based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of the voltage source type energy storage configuration, including:

[0195] By applying a step response to the overall small signal model under different working conditions, the corresponding new energy cluster system damping can be obtained;

[0196] The proportion of fixed voltage source energy storage configuration remains unchanged, and the equivalent short-circuit ratio is adjusted by changing the equivalent impedance of the power grid until the oscillation damping of the new energy cluster system is 0; to determine the critical equivalent short-circuit ratio corresponding to different proportions of voltage source energy storage configuration, and to obtain the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system;

[0197] The energy storage configuration of the new energy cluster system is verified based on the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio.

[0198] like Figure 7 As shown, the third purpose of the embodiment of the present invention is to provide an electronic device, including a memory 701, a processor 702, and a computer program stored in the memory 701 and executable on the processor, wherein the processor implements the voltage source type energy storage configuration method when executing the computer program. It also includes a communication interface 703 and a bus 704.

[0199] A fourth objective of an embodiment of the present invention is to provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the voltage source type energy storage configuration method is implemented.

[0200] A fifth objective of an embodiment of the present invention is to provide a computer program product, which includes computer instructions, and is characterized in that the computer instructions instruct a computer to execute the voltage source energy storage configuration method.

[0201] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0202] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0203] The present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, readable storage media, optical storage, etc.) containing computer-usable program codes.

[0204] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0205] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0206] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A voltage source type energy storage configuration method, characterized in that: include: Impedance models of wind, solar, and storage power generation clusters, transformers, and AC power grids are established respectively, and the impedance models of wind, solar, and storage power generation clusters, transformers, and AC power grids are aggregated to obtain the aggregate impedance of the new energy cluster system, and the impedance per unit value is obtained based on the aggregate impedance; Based on the impedance per unit value, an equivalent short-circuit ratio of a new energy cluster system including a voltage source type energy storage is constructed, and the equivalent short-circuit ratio corresponding to a stable state and an unstable state of the new energy cluster system is selected as the critical equivalent short-circuit ratio of the operation of the new energy cluster system; a first relationship between the configuration ratio of the voltage source type energy storage and the critical equivalent short-circuit ratio of the operation of the new energy cluster system is determined; According to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and combined with the first relationship between the configuration proportion of voltage source energy storage and the critical equivalent short-circuit ratio, the optimal configuration ratio of the new energy cluster system storage is determined, and the energy storage of the new energy cluster system is configured based on the optimal configuration ratio.

2. A voltage source type energy storage configuration method according to claim 1, characterized in that: The impedance models of the wind, solar, and storage power generation cluster, the transformer, and the AC power grid are established respectively, the impedance models of the wind, solar, and storage power generation cluster, the transformer, and the AC power grid are aggregated to obtain the aggregate impedance of the new energy cluster system, and the impedance per unit value is obtained based on the aggregate impedance, including: The impedance model of wind, solar and energy storage power generation cluster is established based on the harmonic linearization method; Establish the impedance model of the transformer in the new energy cluster system and the impedance model of the AC power grid; The impedance models of wind, solar and storage power generation clusters, transformers and AC power grids are aggregated to obtain the aggregated impedance. The aggregated impedance is used as the impedance model of the new energy cluster system, and the impedance per unit value of the new energy cluster system impedance is calculated.

3. A voltage source type energy storage configuration method according to claim 1, characterized in that: The equivalent short-circuit ratio of the new energy cluster system including voltage source type energy storage is constructed based on the impedance per unit value, including: The reciprocal of the per-unit impedance value of the new energy cluster system is taken as the equivalent short-circuit ratio of the new energy cluster system containing voltage source energy storage.

4. A voltage source type energy storage configuration method according to claim 1, characterized in that: The critical equivalent short-circuit ratio is used to characterize the stable operation limit of the new energy cluster system, and specifically characterizes that the new energy cluster system is in a critical state between a stable state and an unstable state.

5. A voltage source type energy storage configuration method according to claim 1, characterized in that: The first relationship between the proportion of voltage source type energy storage configuration and the critical equivalent short circuit ratio of the operation of the new energy cluster system is determined by simulation.

6. A voltage source type energy storage configuration method according to claim 1, characterized in that: The method of determining the optimal configuration ratio of the new energy cluster system according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions and combining the first relationship between the configuration ratio of the voltage source type energy storage and the critical equivalent short circuit ratio includes: According to the impedance model of the new energy cluster system, the equivalent impedance of the power grid under different working conditions is determined. According to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, combined with the first relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio, the optimal configuration ratio of the new energy cluster system storage under different working conditions is determined.

7. A voltage source type energy storage configuration method according to claim 6, characterized in that: The voltage source energy storage configuration ratio is obtained by the following method: The configuration ratio of voltage source energy storage is changed with a preset change amount as the step size to form a variety of working conditions; The scenarios under each working condition are simulated and analyzed separately. The proportion of voltage source energy storage configuration is kept unchanged in the scenarios under each working condition. The equivalent short-circuit ratio of the new energy cluster system is changed by changing the equivalent impedance of the power grid. The change step of the equivalent short-circuit ratio is set. The method of the root locus of the eigenvalue of the new energy cluster system is used to analyze the influence of different equivalent short-circuit ratios on the oscillation mode of the new energy cluster system, so as to determine the critical equivalent short-circuit ratio under each working condition. After analyzing the impact of the equivalent short-circuit ratio under all working conditions on the oscillation mode of the new energy cluster system one by one, the critical equivalent short-circuit ratio under each working condition is obtained, and then the proportion of voltage source energy storage configuration is obtained.

8. A voltage source type energy storage configuration method according to claim 1, characterized in that: Also includes: Constructing state space models of a new energy cluster system and a voltage source energy storage system respectively, and obtaining an overall small signal model of the new energy cluster system according to the state space models; Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration.

9. A voltage source type energy storage configuration method according to claim 8, characterized in that: The state space models of the new energy cluster system and the voltage source energy storage are constructed respectively, and the overall small signal model of the new energy cluster system is obtained according to the state space model, including: A state space model is established for the voltage source energy storage power station, and a linearized small signal model of the voltage source energy storage power station is obtained according to the state space model; The new energy cluster system in the station includes photovoltaic power stations and wind farms. The photovoltaic power stations and wind farms are modeled using equivalent machines to obtain linearized small signal models of the photovoltaic power stations and wind farms respectively. Construct a linearized small signal model of the AC power grid; The linearized small signal models of the voltage source energy storage power station, photovoltaic power station, wind farm and AC power grid are modeled as a whole to obtain the overall small signal model of the new energy cluster system.

10. A voltage source type energy storage configuration method according to claim 9, characterized in that: Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of the voltage source type energy storage configuration, including: By applying a step response to the overall small signal model under different working conditions, the corresponding new energy cluster system damping can be obtained; The proportion of fixed voltage source energy storage configuration remains unchanged, and the equivalent short-circuit ratio is adjusted by changing the equivalent impedance of the power grid until the oscillation damping of the new energy cluster system is 0; to determine the critical equivalent short-circuit ratio corresponding to different proportions of voltage source energy storage configuration, and to obtain the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system; The energy storage configuration of the new energy cluster system is verified based on the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio.

11. A voltage source energy storage configuration system, characterized in that: include: An impedance model building module is used to respectively build impedance models of a wind-solar-storage power generation cluster, a transformer and an AC power grid, aggregate the impedance models of the wind-solar-storage power generation cluster, the transformer and the AC power grid to obtain an aggregate impedance of the new energy cluster system, and obtain an impedance per unit value based on the aggregate impedance; An equivalent short-circuit ratio construction module is used to construct an equivalent short-circuit ratio of a new energy cluster system containing a voltage source type energy storage based on the impedance per unit value, select the equivalent short-circuit ratio corresponding to the new energy cluster system being in a stable state and an unstable state as the critical equivalent short-circuit ratio of the operation of the new energy cluster system; determine a first relationship between the configuration ratio of the voltage source type energy storage and the critical equivalent short-circuit ratio of the operation of the new energy cluster system; The optimal configuration ratio determination module is used to determine the optimal configuration ratio of the new energy cluster system according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and in combination with the first relationship between the voltage source type energy storage configuration ratio and the critical equivalent short-circuit ratio, and configure the new energy cluster system energy storage based on the optimal configuration ratio.

12. A voltage source energy storage configuration system according to claim 11, characterized in that: In the impedance model establishment module, impedance models of the wind, solar, and storage power generation cluster, transformer, and AC power grid are established respectively, and the impedance models of the wind, solar, and storage power generation cluster, transformer, and AC power grid are aggregated to obtain the aggregate impedance of the new energy cluster system, and the impedance per unit value is obtained based on the aggregate impedance, including: The impedance model of wind, solar and energy storage power generation cluster is established based on the harmonic linearization method; Establish the impedance model of the transformer in the new energy cluster system and the impedance model of the AC power grid; The impedance models of wind, solar and storage power generation clusters, transformers and AC power grids are aggregated to obtain the aggregated impedance. The aggregated impedance is used as the impedance model of the new energy cluster system, and the impedance per unit value of the new energy cluster system impedance is calculated.

13. A voltage source type energy storage configuration system according to claim 11, characterized in that: In the equivalent short-circuit ratio construction module, the equivalent short-circuit ratio of the new energy cluster system including voltage source type energy storage is constructed based on the impedance per unit value, including: The reciprocal of the per-unit impedance value of the new energy cluster system is taken as the equivalent short-circuit ratio of the new energy cluster system containing voltage source energy storage.

14. A voltage source type energy storage configuration system according to claim 11, characterized in that: The critical equivalent short-circuit ratio is used to characterize the stable operation limit of the new energy cluster system, and specifically characterizes that the new energy cluster system is in a critical state between a stable state and an unstable state.

15. A voltage source energy storage configuration system according to claim 11, characterized in that: The first relationship between the proportion of voltage source type energy storage configuration and the critical equivalent short circuit ratio of the operation of the new energy cluster system is determined by simulation.

16. A voltage source energy storage configuration system according to claim 11, characterized in that: In the optimal configuration ratio determination module, the optimal configuration ratio of the new energy cluster system is determined according to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, and in combination with the first relationship between the voltage source type energy storage configuration ratio and the critical equivalent short circuit ratio, including: According to the impedance model of the new energy cluster system, the equivalent impedance of the power grid under different working conditions is determined. According to the equivalent impedance of the power grid and the external characteristic parameters of the new energy cluster system under different working conditions, combined with the first relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio, the optimal configuration ratio of the new energy cluster system storage under different working conditions is determined.

17. A voltage source energy storage configuration system according to claim 16, characterized in that: The voltage source energy storage configuration ratio is obtained by the following method: The configuration ratio of voltage source energy storage is changed with a preset change amount as the step size to form a variety of working conditions; The scenarios under each working condition are simulated and analyzed separately. The proportion of voltage source energy storage configuration is kept unchanged in the scenarios under each working condition. The equivalent short-circuit ratio of the new energy cluster system is changed by changing the equivalent impedance of the power grid. The change step of the equivalent short-circuit ratio is set. The method of the root locus of the eigenvalue of the new energy cluster system is used to analyze the influence of different equivalent short-circuit ratios on the oscillation mode of the new energy cluster system, so as to determine the critical equivalent short-circuit ratio under each working condition. After analyzing the impact of the equivalent short-circuit ratio under all working conditions on the oscillation mode of the new energy cluster system one by one, the critical equivalent short-circuit ratio under each working condition is obtained, and then the proportion of voltage source energy storage configuration is obtained.

18. A voltage source energy storage configuration system according to claim 11, characterized in that: Also included is an energy storage configuration verification module for: Constructing state space models of a new energy cluster system and a voltage source energy storage system respectively, and obtaining an overall small signal model of the new energy cluster system according to the state space models; Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of voltage source energy storage configuration.

19. A voltage source type energy storage configuration system according to claim 18, characterized in that: The state space models of the new energy cluster system and the voltage source energy storage are constructed respectively, and the overall small signal model of the new energy cluster system is obtained according to the state space model, including: A state space model is established for the voltage source energy storage power station, and a linearized small signal model of the voltage source energy storage power station is obtained according to the state space model; The new energy cluster system in the station includes photovoltaic power stations and wind farms. The photovoltaic power stations and wind farms are modeled using equivalent machines to obtain linearized small signal models of the photovoltaic power stations and wind farms respectively. Construct a linearized small signal model of the AC power grid; The linearized small signal models of the voltage source energy storage power station, photovoltaic power station, wind farm and AC power grid are modeled as a whole to obtain the overall small signal model of the new energy cluster system.

20. A voltage source energy storage configuration system according to claim 19, characterized in that: Based on the overall small signal model, the energy storage configuration of the new energy cluster system is verified by using the relationship between the oscillation damping of the new energy cluster system and the proportion of the voltage source type energy storage configuration, including: By applying a step response to the overall small signal model under different working conditions, the corresponding new energy cluster system damping can be obtained; The proportion of fixed voltage source energy storage configuration remains unchanged, and the equivalent short-circuit ratio is adjusted by changing the equivalent impedance of the power grid until the oscillation damping of the new energy cluster system is 0; to determine the critical equivalent short-circuit ratio corresponding to different proportions of voltage source energy storage configuration, and to obtain the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio of the new energy cluster system; The energy storage configuration of the new energy cluster system is verified based on the second relationship between the proportion of voltage source energy storage configuration and the critical equivalent short-circuit ratio.

21. An electronic device, characterized in that: It comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the voltage source type energy storage configuration method according to any one of claims 1 to 10 when executing the computer program.

22. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the voltage source energy storage configuration method according to any one of claims 1 to 10 is implemented.

23. A computer program product, comprising computer instructions, characterized in that: The computer instructions instruct the computer to execute the voltage source energy storage configuration method described in any one of claims 1-10.

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