Energy storage capacity configuration analysis method, system and equipment based on power system frequency characteristic model under wind storage combined frequency modulation and storage medium

Abstract

The invention relates to the technical field of power systems, in particular to an energy storage capacity configuration analysis method, system and device based on a power system frequency characteristic model under wind storage combined frequency modulation and a storage medium, and the method comprises the steps: determining frequency control models and system parameters of different frequency modulation units; based on the frequency control models of different frequency modulation units, a power system frequency characteristic model under wind storage combined frequency modulation is established according to the participation degree of the frequency modulation units under different frequency modulation modes; configuring the energy storage capacity of the frequency characteristic model, and generating power by adopting the rated power of the wind power plant to meet the configuration requirements of power and capacity at any wind speed; establishing a simulation model corresponding to the power system frequency characteristic model based on the simulation platform according to the power system frequency characteristic model and configuration requirements, performing a simulation test, and analyzing to obtain performance comparison diagrams in different modes; the stability of the frequency of the wind storage system is enhanced, the configuration cost of energy storage is reduced, and the economic benefit of energy storage in wind power frequency modulation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method, system, device and storage medium for analyzing energy storage capacity configuration based on a frequency characteristic model of a power system under wind-storage combined frequency modulation. Background Art

[0002] With the increasing penetration rate of wind turbines represented by doubly-fed wind turbines in my country's power grid, the frequency regulation capability of the power grid system is reduced due to the decoupling characteristics of their rotation speed and the frequency of the power grid system, which poses certain challenges to the safe and stable operation of the power grid. The unit-level wind storage frequency regulation technology of the wind storage system has the advantages of low latency and flexible control, and has good application prospects.

[0003] In related technologies, the participation of wind-storage systems in frequency regulation is mainly achieved through the energy management system of the wind farm. However, this method has problems of communication delay and slow response speed, especially in terms of extremely short inertia response time. How to improve the frequency support capability of the wind-storage system and realize the complementarity of the wind-storage frequency regulation capability is an issue that needs to be solved urgently.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method, system, device and storage medium for analyzing energy storage capacity configuration based on the frequency characteristic model of the power system under wind-storage combined frequency regulation, so as to enhance the stability of the frequency of the wind-storage system, reduce the configuration cost of energy storage, and improve the economic benefits of energy storage in wind power frequency regulation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a method for analyzing energy storage capacity configuration based on a frequency characteristic model of a power system under wind-storage combined frequency regulation, comprising the following steps:

[0007] Determining frequency control models of different frequency modulation units and system parameters of each of the frequency modulation units;

[0008] Based on the frequency control models of different frequency regulation units, and according to the participation degree of each frequency regulation unit under different frequency regulation modes, a frequency characteristic model of the power system under wind-storage joint frequency regulation is established;

[0009] The energy storage capacity of the power system frequency characteristic model described in the wind-storage joint frequency regulation is configured, and the rated power of the wind farm is used for power generation to meet the power and capacity configuration requirements at any wind speed;

[0010] According to the power system frequency characteristic model and configuration requirements, a simulation model corresponding to the power system frequency characteristic model is established based on a simulation platform, and simulation experiments are carried out to analyze and obtain performance comparison diagrams under different modes.

[0011] Furthermore, the frequency regulation unit includes a thermal power unit, a hydropower unit, a wind farm, energy storage and a load, and the system parameters of the frequency regulation unit include a primary frequency regulation droop coefficient R, a load power increment ΔP L , thermal power generation unit power increment ΔP R , Hydropower unit power generation increment ΔP H , Wind farm power generation increment ΔP W , Energy storage system power generation increment ΔP E ′, the deviation between the actual frequency and the rated frequency Δf, and the deviation between the generated power and the load power in the system ΔP.

[0012] Furthermore, when the frequency modulation unit does not participate in frequency modulation, the transfer function G(s) of the frequency control model of the system is:

[0013]

[0014] The transfer function G of the frequency control model when the thermal power unit participates in frequency regulation R (s) is:

[0015]

[0016] Transfer function G of frequency control model when hydropower units participate in frequency regulation H (s) is:

[0017]

[0018] Wherein, Δf is the deviation between the actual frequency and the rated frequency, ΔP is the deviation between the power generation and the load power in the system, M=2H, H is the inertia constant, s is the complex frequency variable in the Laplace transform, and D is the damping constant; K R is the regulation gain of the thermal power unit, T R is the time constant of the thermal power unit, K H is the regulation gain of the hydropower unit, T H is the time constant of the hydropower unit.

[0019] Furthermore, when the wind farm is connected to the system but does not participate in frequency modulation, the transfer function G'(s) of the frequency control model of the system is:

[0020] M′=(1-p)M

[0021]

[0022] The transfer function G of the frequency control model when the wind farm participates in frequency modulation through rotor inertia control is ω (s) is:

[0023]

[0024] The transfer function G of the frequency control model when the wind farm participates in frequency modulation through variable pitch control is β (s) is:

[0025]

[0026] The transfer function G of the frequency control model when the wind farm participates in frequency modulation through rotor inertia and variable pitch control is W (s) is:

[0027]

[0028] Wherein, M' is the equivalent inertia constant, p is the wind power penetration rate of the wind farm, Δf is the deviation between the actual frequency and the rated frequency, ΔP is the deviation between the power generation and the load power in the system, s is the complex frequency variable in the Laplace transform, and D' is the damping constant; k df is the inertial response coefficient, T ω is the rotor inertia response time constant, ΔP ω Provide power for rotor inertia; k pf is the primary frequency modulation coefficient, T β is the pitch response time constant, ΔP B Provides power for pitch control.

[0029] Furthermore, the transfer function G of the frequency control model when the energy storage is connected to the system but does not participate in frequency modulation is E (s) is:

[0030]

[0031] The transfer function G′ of the frequency control model when the energy storage is connected to the system and participates in frequency modulation E (s) is:

[0032]

[0033] The transfer function G' of the frequency control model of the system when the wind farm and energy storage are connected to the system but do not participate in frequency regulation S (s) is:

[0034]

[0035] The transfer function G of the frequency control model when the wind farm and the energy storage form a wind-storage combined system WE (s) is:

[0036]

[0037] Among them, ΔP E To provide power when only energy storage is used to participate in frequency regulation, ΔP E ′ is the power increment of the energy storage system, ΔP W is the power increment of the wind farm, Δf is the deviation between the actual frequency and the rated frequency, M' S is the equivalent inertia constant, D' S is the damping constant, s is the complex frequency variable in the Laplace transform; k df is the inertial response coefficient, k pf is the primary frequency modulation coefficient, T ω is the rotor inertia response time constant, T β is the pitch response time constant, T E is the time constant of energy storage response; G W (s) is the transfer function of the frequency control model when the wind farm participates in frequency regulation through rotor inertia and variable pitch control.

[0038] Furthermore, in the power system frequency characteristic model, when there is no wind farm connected, the frequency regulation unit is a thermal power unit and a hydropower unit, the power generation is determined as the participation measurement value, and the power generation participation of the thermal power unit is set to x. The frequency characteristic function G when there is no wind farm connected s_o (s) is:

[0039]

[0040] When the wind farm is connected but does not participate in frequency regulation, the frequency regulation units are thermal power units and hydropower units, the power generation is determined as the participation measurement value, and the wind power penetration rate of the wind farm is p. Then the frequency characteristic function G when the wind farm is connected but does not participate in frequency regulation is s_W (s) is:

[0041]

[0042] When wind farms and energy storage jointly regulate frequency, the frequency regulation units are thermal power units, hydropower units, wind farms and energy storage. Then the frequency characteristic function G when wind farms and energy storage jointly participate in frequency regulation is s_WEF (s) is:

[0043]

[0044] Frequency characteristic function G when wind farm participates in frequency modulation s_Wf (s) is:

[0045]

[0046] Frequency characteristic function G when energy storage participates in frequency modulations_Ef (s) is:

[0047]

[0048] Where Δf is the deviation between the actual frequency and the rated frequency, ΔP L is the load power increment, G(s) is the transfer function of the frequency control model of the system when the frequency modulation unit does not participate in the frequency modulation, G R (s) is the transfer function of the frequency control model when the thermal power unit participates in frequency regulation, G H (s) is the transfer function of the frequency control model when the hydropower unit participates in frequency regulation; G'(s) is the transfer function of the frequency control model when the wind farm is connected to the system but does not participate in frequency regulation, G' S (s) is the transfer function of the frequency control model of the system when the wind farm and energy storage are connected to the system but do not participate in frequency regulation, G WE (s) is the transfer function of the frequency control model when the wind farm and the energy storage form a wind-storage combined system, G W (s) is the transfer function of the frequency control model when the wind farm participates in frequency regulation through rotor inertia and variable pitch control, G E (s) is the transfer function of the frequency control model when energy storage is connected to the system but does not participate in frequency regulation.

[0049] Furthermore, the step of establishing the frequency characteristic model of the power system under the wind-storage combined frequency regulation includes analyzing the frequency characteristics of the system using the final value theorem, and the steady-state frequency deviation Δf of the system when it is only subjected to load disturbance ss for:

[0050]

[0051] The steady-state frequency deviation Δf of the system when there is no wind farm connected ss_0 for:

[0052]

[0053] The steady-state frequency deviation Δf of the system under high wind farm penetration ss_W for:

[0054]

[0055] The steady-state frequency deviation Δf of the system when the wind farm participates in frequency regulation and wind power storage jointly regulates frequency ss_Wf for:

[0056]

[0057] Among them, ΔP L is the load power increment, p is the wind power penetration rate of the wind farm, k pfis the primary frequency modulation coefficient, D is the damping constant, and R is the primary frequency modulation droop coefficient.

[0058] Furthermore, in the wind-storage joint frequency regulation, when the wind farm provides inertial response, the configuration requirement satisfies the following formula:

[0059]

[0060] When the wind farm provides primary frequency regulation, the configuration requirement satisfies the following formula:

[0061]

[0062] E p =P p ·T d

[0063] When a wind farm provides primary frequency regulation through pitch control and energy storage, the configuration requirements meet the following formula:

[0064]

[0065] Among them, P h The required power to provide inertial response for the wind farm, P W is the rated power of the wind farm, H is the inertia constant of the power system, is the frequency change rate, E h The required capacity to provide inertial response for wind farms, is the rated frequency of the wind farm, is the minimum frequency of the wind farm; P p Provide the required power for primary frequency regulation for the wind farm, Δf is the deviation between the actual frequency and the rated frequency, f r The actual frequency of the primary frequency regulation provided by the wind farm, R is the primary frequency regulation droop coefficient, E p Provide the required capacity for primary frequency regulation for wind farms, T d is the duration of a frequency regulation of the wind farm; ΔP β The wind farm provides the required power for primary frequency regulation through pitch change, T β is the pitch response time constant, ΔP E ′ is the power required for primary frequency regulation provided by energy storage, E E Provide the required capacity for primary frequency regulation for energy storage.

[0066] The present invention also provides an energy storage capacity configuration analysis system based on a frequency characteristic model of a power system under wind and storage combined frequency regulation, comprising:

[0067] A parameter determination module, used to determine frequency control models of different frequency modulation units and system parameters of each of the frequency modulation units;

[0068] A model building module is used to build a frequency characteristic model of the power system under wind-storage joint frequency regulation based on the frequency control models of different frequency regulation units and according to the participation degree of each frequency regulation unit under different frequency regulation modes;

[0069] The demand configuration module is used to configure the energy storage capacity of the power system frequency characteristic model described in the wind-storage joint frequency regulation, and to generate electricity using the rated power of the wind farm to meet the configuration requirements of power and capacity at any wind speed;

[0070] The simulation analysis module is used to establish a simulation model corresponding to the power system frequency characteristic model based on a simulation platform according to the power system frequency characteristic model and configuration requirements, and to conduct simulation experiments to analyze and obtain performance comparison diagrams under different modes.

[0071] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under the combined frequency modulation of wind and storage are implemented as described in any one of the above items.

[0072] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under the combined frequency regulation of wind and storage are implemented as described in any of the above items.

[0073] The beneficial effects of the present invention are as follows: the present invention enables the wind farm to have the inertial response and primary frequency regulation capability similar to traditional power sources such as hydropower units and thermal power units through the wind-storage combined frequency regulation method, and further improves the frequency characteristics of the power system under high wind power penetration, reduces the frequency change rate and the maximum frequency deviation; through the complementary characteristics of different frequency regulation methods, energy storage makes up for the shortcomings of short rotor inertia duration and slow pitch control response of wind turbines, thereby improving the practicability of the wind-storage combined frequency regulation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0075] Figure 1 It is a flow chart of an energy storage capacity configuration analysis method based on a frequency characteristic model of a power system under wind-storage combined frequency regulation in an embodiment of the present invention;

[0076] Figure 2Schematic diagram of a frequency control model of a frequency regulation unit in a power system according to an embodiment of the present invention;

[0077] Figure 3 It is a schematic diagram of a frequency characteristic model of a power system under wind-storage combined frequency regulation in an embodiment of the present invention;

[0078] Figure 4 The Bode diagram of the frequency characteristics of the power system in the same frequency modulation mode in the embodiment of the present invention;

[0079] Figure 5 A structural diagram of a simulation model in an embodiment of the present invention;

[0080] Figure 6 is a diagram of system frequency characteristics under different frequency modulation modes in an embodiment of the present invention;

[0081] Figure 7 This is a wind farm frequency modulation power diagram in an embodiment of the present invention;

[0082] Figure 8 This is a power diagram of wind-storage combined frequency regulation in an embodiment of the present invention;

[0083] Fig. 9 This is a frequency characteristic comparison diagram of energy storage frequency regulation and wind storage combined frequency regulation in an embodiment of the present invention;

[0084] Fig.10 This is a power comparison diagram of energy storage frequency regulation and wind storage combined frequency regulation in an embodiment of the present invention;

[0085] Fig.11 It is a structural schematic diagram of the energy storage capacity configuration analysis system based on the power system frequency characteristic model under wind-storage combined frequency regulation in an embodiment of the present invention. DETAILED DESCRIPTION

[0086] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0087] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0088] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0089] like Figures 1 to 6 The energy storage capacity configuration analysis method shown in the figure based on the power system frequency characteristic model under wind and storage combined frequency regulation includes the following steps:

[0090] Determine the frequency control models of different frequency regulation units and the system parameters of each frequency regulation unit; provide necessary data and theoretical basis for subsequent model establishment and energy storage capacity configuration; help determine the grid frequency changes of each frequency regulation unit in joint frequency regulation;

[0091] Based on the frequency control models of different frequency regulation units, and according to the participation of each frequency regulation unit under different frequency regulation modes, a frequency characteristic model of the power system under wind-storage joint frequency regulation is established; it is the basis for subsequent energy storage capacity configuration and simulation experiments, and is helpful for subsequent prediction and analysis of the performance of wind-storage systems under different conditions;

[0092] The energy storage capacity of the power system frequency characteristic model in the wind-storage joint frequency regulation is configured, and the rated power of the wind farm is used to generate electricity to meet the configuration requirements of power and capacity at any wind speed; this ensures that the wind-storage system can meet the power and capacity requirements under any wind speed conditions, while making up for the insufficient response of wind turbines;

[0093] According to the power system frequency characteristic model and configuration requirements, a simulation model corresponding to the power system frequency characteristic model is established based on the simulation platform, and simulation experiments are carried out to analyze and obtain performance comparison charts under different modes; it can analyze the performance under different frequency regulation modes, provide guidance for actual system design and operation, and ensure the actual application effect of wind-storage combined frequency regulation technology.

[0094] The present invention uses a wind-storage combined frequency modulation method to enable the wind farm to have an inertial response and primary frequency modulation capability similar to that of traditional power sources such as hydropower units and thermal power units, and further improves the frequency characteristics of the power system under high wind power penetration, reducing the frequency change rate and the maximum frequency deviation; through the complementary characteristics of different frequency modulation methods, energy storage makes up for the shortcomings of short rotor inertia duration and slow pitch control response of wind turbines, thereby improving the practicability of the wind-storage combined frequency modulation technology.

[0095] Among them, the simulation platform can use MATLAB and Simulink to establish a simulation model corresponding to the power system frequency characteristic model. Simulink provides a modeling environment based on a graphical interface, which makes the control system modeling process more intuitive and easy to understand, and can simulate the control system quickly and accurately; Simulink is tightly integrated with MATLAB, and users can design and implement control systems in combination with MATLAB's algorithms and functions, so as to more clearly observe the behavior of the power system; other simulation platforms can also be used to establish a simulation model corresponding to the power system frequency characteristic model, which is not specifically limited here.

[0096] Based on the above embodiment, the frequency regulation unit includes a thermal power unit, a hydropower unit, a wind farm, energy storage and a load. The system parameters of the frequency regulation unit include a primary frequency regulation droop coefficient R, a load power increment ΔP L , thermal power generation unit power increment ΔP R , Hydropower unit power generation increment ΔP H , Wind farm power generation increment ΔP W , Energy storage system power generation increment ΔP E ′, the deviation between the actual frequency and the rated frequency Δf, and the deviation between the generated power and the load power in the system ΔP.

[0097] Among them, wind turbines and hydropower units are traditional power sources, wind farms and energy storage are additional power system frequency regulation frameworks, and the primary frequency regulation droop coefficient R determines the frequency regulation response that the thermal power unit can provide when the frequency deviates. The larger the droop coefficient, the more sensitive the thermal power unit is to the frequency change, and the power generation increment ΔP of the thermal power unit is R It indicates the additional power generation that thermal power units can provide during frequency modulation; the power generation increment of hydropower units ΔP H It indicates the additional power generation that the hydropower unit can provide during the frequency regulation process; the power generation increment of the wind farm ΔP W Indicates the additional power generation that the wind farm can provide during the frequency regulation process; the power generation increment of the energy storage system ΔP E ′ represents the additional power generation that the energy storage system can provide during the frequency regulation process. The energy storage system can respond quickly to make up for the slow response of wind turbines. The actual frequency and rated frequency deviation Δf reflects the difference between the actual operating frequency and the rated frequency of the power grid, and is the main driving factor for the response of the frequency regulation system. The power generation and load power deviation ΔP in the system represents the difference between the total power generation and the total load power in the system, which directly affects the frequency stability of the power grid.

[0098] On the basis of the above embodiment, the transfer function G(s) of the frequency control model of the system when the frequency modulation unit does not participate in the frequency modulation is:

[0099]

[0100] The transfer function G of the frequency control model when the thermal power unit participates in frequency regulation R (s) is:

[0101]

[0102] Transfer function G of frequency control model when hydropower units participate in frequency regulation H (s) is:

[0103]

[0104] Wherein, Δf is the deviation between the actual frequency and the rated frequency, ΔP is the deviation between the power generation and the load power in the system, M=2H, H is the inertia constant, s is the complex frequency variable in the Laplace transform, and D is the damping constant; K R is the regulation gain of the thermal power unit, T R is the time constant of the thermal power unit, K H is the regulation gain of the hydropower unit, T H is the time constant of the hydropower unit.

[0105] On the basis of the above embodiment, wind farm power generation is used to replace thermal power generating units and hydropower generating units to access the system. The wind power penetration rate of the wind farm is p. When the wind farm is connected to the system but does not participate in frequency modulation, the transfer function G'(s) of the frequency control model of the system is:

[0106] M′=(1-p)M

[0107]

[0108] In the frequency characteristic model related to the wind farm, the variable-speed wind turbine generator set can control the rotor inertia and blade angle by adding a frequency link, thereby having the ability of inertial response and primary frequency regulation.

[0109] Specifically, the inertia of the rotor is achieved by adjusting the converter on one side of the rotor to affect the change in rotor speed, temporarily releasing or absorbing the energy stored in the rotating mass of the wind turbine generator set, so as to quickly respond to the frequency fluctuations of the system. Compared with the one-time and two-time frequency modulation, the time period of the rotor inertial reaction is shorter and the response efficiency is higher. In addition, this inertial reaction does not require reserve power, and its duration is relatively short due to the speed constraint, generally less than ten seconds; however, one-time and two-time frequency modulation require reserve power, and their duration will be longer, generally tens of seconds to minutes. Therefore, the rotor inertia control technology of wind turbines has the ability to adapt to simulate the inertial response of conventional energy sources. The transfer function G of the frequency control model when the wind farm participates in frequency modulation through rotor inertia control is ω (s) is:

[0110]

[0111] Specifically, variable speed control is achieved by adjusting the angle of the wind turbine blades so that it can stay at a certain working position close to the maximum output point, thereby reserving a portion of reserve energy; this method can effectively enhance the output regulation capability and expand the adjustable range, but due to the limitation of mechanical characteristics, its feedback speed is slightly slower than other methods, and there is a certain degree of lag; the characteristics of wind turbine variable pitch control technology are suitable for simulating the primary frequency modulation of conventional power sources. When the wind farm participates in frequency modulation through variable pitch control, the transfer function G of the frequency control model β (s) is:

[0112]

[0113] The combination of inertial control and pitch control of wind turbine generator sets enables the wind farm to have inertial response and primary frequency regulation capability similar to that of traditional generator sets. The transfer function G of the frequency control model when the wind farm participates in frequency regulation through rotor inertia and pitch control is W (s) is:

[0114]

[0115] Wherein, M' is the equivalent inertia constant, p is the wind power penetration rate of the wind farm, Δf is the deviation between the actual frequency and the rated frequency, ΔP is the deviation between the power generation and the load power in the system, s is the complex frequency variable in the Laplace transform, and D' is the damping constant; k df is the inertial response coefficient, T ω is the rotor inertia response time constant, ΔP ω Provide power for rotor inertia; k pf is the primary frequency modulation coefficient, T β is the pitch response time constant, ΔP B Provides power for pitch control.

[0116] On the basis of the above embodiments, the frequency characteristic model of the energy storage system has the technical advantages of fast response, flexible control, stable operation, etc., and an appropriate amount of energy storage system is configured in the wind farm to meet the frequency regulation requirements of the wind farm in the power system, so that the inertial response of the wind farm is similar to that of the traditional power source, and the primary frequency regulation capability is strong; the energy storage model is expressed by a first-order transfer function. When the energy storage is connected to the system but does not participate in the frequency regulation, the transfer function G of the frequency control model is E (s) is:

[0117]

[0118] In the process of modeling the frequency characteristics of wind-storage joint frequency regulation, energy storage equipment is used to adjust the frequency of the wind farm. With its rapid response and stable operation, it supplements the frequency regulation energy gap of the wind farm itself, so that the wind-storage joint frequency regulation system has the functions of inertia and one-time frequency regulation, which can meet the frequency regulation requirements of the power grid for wind farms. The transfer function G′ of the frequency control model when energy storage is connected to the system and participates in frequency regulation E (s) is:

[0119]

[0120] The transfer function G' of the frequency control model of the system when the wind farm and energy storage are connected to the system but do not participate in frequency regulation S (s) is:

[0121]

[0122] The transfer function G of the frequency control model when the wind farm and energy storage form a wind-storage combined system WE (s) is:

[0123]

[0124] Among them, ΔP E To provide power when only energy storage is used to participate in frequency regulation, ΔP E ′ is the power increment of the energy storage system, ΔP W is the power increment of the wind farm, Δf is the deviation between the actual frequency and the rated frequency, M' S is the equivalent inertia constant, D' S is the damping constant, s is the complex frequency variable in the Laplace transform; k df is the inertial response coefficient, k pf is the primary frequency modulation coefficient, T ω is the rotor inertia response time constant, T β is the pitch response time constant, T E is the time constant of energy storage response; G W (s) is the transfer function of the frequency control model when the wind farm participates in frequency regulation through rotor inertia and variable pitch control.

[0125] It should be noted that M, M', M' S are equivalent inertia constants, D, D', D' S Both are damping constants. The only difference is that when different frequency regulation units are connected to the power system, the values ​​of the equivalent inertia constant and the damping constant are different.

[0126] On the basis of the above embodiments, based on the participation of each frequency regulation unit under different frequency regulation modes, a frequency characteristic model of the power system under wind-storage joint frequency regulation is established. Specifically, in the power system frequency characteristic model, when there is no wind farm access, the frequency regulation units are thermal power units and hydropower units, the power generation is determined as the participation measurement value, and the power generation participation of the thermal power unit is set to x. The frequency characteristic function G when there is no wind farm access s_o (s) is:

[0127]

[0128] When the wind farm is connected but does not participate in frequency regulation, the frequency regulation units are thermal power units and hydropower units, the system equivalent inertia is reduced, the regulation effect of the frequency regulation unit is reduced, the power generation is determined as the participation measurement value, the wind power penetration rate of the wind farm is p, then the frequency characteristic function G when the wind farm is connected but does not participate in frequency regulation s_W (s) is:

[0129]

[0130] When wind farms and energy storage jointly regulate frequency, the frequency regulation units are thermal power units, hydropower units, wind farms and energy storage. Then the frequency characteristic function G when wind farms and energy storage jointly participate in frequency regulation is s_WEF (s) is:

[0131]

[0132] Frequency characteristic function G when wind farm participates in frequency modulation s_Wf (s) is:

[0133]

[0134] Frequency characteristic function G when energy storage participates in frequency modulation s_Ef (s) is:

[0135]

[0136] Where Δf is the deviation between the actual frequency and the rated frequency, ΔP L is the load power increment, G(s) is the transfer function of the frequency control model of the system when the frequency modulation unit does not participate in the frequency modulation, G R (s) is the transfer function of the frequency control model when the thermal power unit participates in frequency regulation, G H (s) is the transfer function of the frequency control model when the hydropower unit participates in frequency regulation; G'(s) is the transfer function of the frequency control model when the wind farm is connected to the system but does not participate in frequency regulation, G' S (s) is the transfer function of the frequency control model of the system when the wind farm and energy storage are connected to the system but do not participate in frequency regulation, G WE(s) is the transfer function of the frequency control model when the wind farm and energy storage form a wind-storage combined system, G W (s) is the transfer function of the frequency control model when the wind farm participates in frequency regulation through rotor inertia and variable pitch control, G E (s) is the transfer function of the frequency control model when energy storage is connected to the system but does not participate in frequency regulation.

[0137] On the basis of the above embodiment, the steps of establishing the frequency characteristic model of the power system under the wind-storage combined frequency regulation include using the final value theorem to analyze the frequency characteristics of the system, and the steady-state frequency deviation Δf of the system when it is only subjected to load disturbance ss for:

[0138]

[0139] The steady-state frequency deviation Δf of the system when there is no wind farm connected ss_0 for:

[0140]

[0141] The steady-state frequency deviation Δf of the system under high wind farm penetration ss_W for:

[0142]

[0143] The steady-state frequency deviation Δf of the system when the wind farm participates in frequency regulation and wind power storage jointly regulates frequency ss_Wf for:

[0144]

[0145] Among them, ΔP L is the load power increment, p is the wind power penetration rate of the wind farm, k pf is the primary frequency modulation coefficient, D is the damping constant, and R is the primary frequency modulation droop coefficient.

[0146] The final value theorem is used to analyze the system frequency characteristics. From the above formula, it can be seen that the system frequency deviation is related to the damping characteristic D, the droop characteristic R and the disturbance size ΔP L When wind power does not participate in frequency regulation, the increase in wind power penetration will cause the system steady-state frequency deviation to increase; when wind power participates in frequency regulation, it can be adjusted through the primary frequency regulation system K pf Flexible adjustment of steady-state frequency deviation, K pf =1 / R, the frequency deviation remains unchanged after wind power is connected; the steady-state frequency deviation of wind-storage combined frequency regulation is basically the same as that of wind power frequency regulation, indicating that due to capacity limitations, the energy storage system is difficult to continuously provide frequency regulation power and has little effect on the steady-state frequency deviation.

[0147] Based on the above embodiments, the energy storage configuration capacity in wind-storage joint frequency regulation is the key issue for whether it is feasible to participate in the frequency regulation of the power system; in wind-storage joint frequency regulation, when the wind farm provides inertial response, the configuration requirement satisfies the following formula:

[0148]

[0149] When the wind farm provides primary frequency regulation, the configuration requirements meet the following formula:

[0150]

[0151] E p =P p ·T d

[0152] When a wind farm provides primary frequency regulation through pitch control and energy storage, the configuration requirements meet the following formula:

[0153]

[0154]

[0155] Among them, P h The required power to provide inertial response for the wind farm, P W is the rated power of the wind farm, H is the inertia constant of the power system, is the frequency change rate, E h The required capacity to provide inertial response for wind farms, is the rated frequency of the wind farm, is the minimum frequency of the wind farm; P p Provide the required power for primary frequency regulation for the wind farm, Δf is the deviation between the actual frequency and the rated frequency, f r The actual frequency of the primary frequency regulation provided by the wind farm, R is the primary frequency regulation droop coefficient, E p Provide the required capacity for primary frequency regulation for wind farms, T d is the duration of a frequency regulation of the wind farm; ΔP β The wind farm provides the required power for primary frequency regulation through pitch change, T β is the pitch response time constant, ΔP E ′ is the power required for primary frequency regulation provided by energy storage, E E Provide the required capacity for primary frequency regulation for energy storage.

[0156] Specifically, this embodiment provides a specific method for analyzing the configuration of energy storage capacity. After determining the thermal power unit, hydropower unit, wind farm, energy storage and load and related system parameters, the frequency characteristic function of the power system under different frequency modulation modes is used to analyze its amplitude-frequency characteristics using the Bode diagram, wherein the power generation of the thermal power unit and the hydropower unit is 80% and 20% respectively, that is, x=80%; the wind power penetration rate is 20%, that is, p=20%; the system equivalent inertia time constant H is 4s, the damping constant D is 2; the wind power inertia k df and the primary frequency modulation coefficient k pf 8 and 20 respectively, the inertial response T ω and pitch time constant T β 0.1s and 3s; energy storage time constant T E Take it as 0.3s.

[0157] During the demand configuration process, the droop coefficient R is taken as 0.04 and the duration T d The frequency deviation Δf is 0.2Hz, and the wind farm provides a frequency modulation power P p =10%PW(MW), capacity E h =0.83PW(kWh).

[0158] The wind turbine rotor inertia response speed is fast and the speed range is wide, which can meet the power and capacity requirements of the power system inertia response. The power ΔP provided by the rotor inertia can be set. ω =16% PW(MW), rotor inertia provides capacity E h =0.087PW(kWh).

[0159] When t=0s, the energy storage system requires the maximum power, so the energy storage power is P r =10%PW(MW), which is 10% of the rated power of the wind farm. The energy storage capacity is as follows, in kWh.

[0160] E r =0.0278P W T β / ((η SOC (0)-η SOCmin ))

[0161] From the above formula, it can be seen that within the fixed energy storage SOC operating range, the energy storage capacity demand and the wind turbine pitch adjustment response time T β Regarding the variable pitch with fast response speed, less energy storage system is required, as shown in Table 1 below.

[0162] Table 1: Comparison of wind power and energy storage frequency regulation power and capacity requirements

[0163]

[0164]

[0165] A frequency characteristic model of the power system including thermal power, hydropower, wind power and energy storage was established on the Matlab platform for verification, and the frequency characteristics of the power system under different working conditions were analyzed. The load was 1000MW, the rated power of the wind farm was 200MW, and the load disturbance was 60MW.

[0166] At rated wind speed, the wind power penetration rate is 20%. The simulation analysis shows that the system frequency characteristics change in three operating modes: wind power does not participate in frequency regulation, wind power participates in frequency regulation, and wind power storage jointly participates in frequency regulation. Figure 6 The comparison of frequency quality indicators is shown in Table 2.

[0167] Table 2: Comparison of frequency characteristics under different frequency modulation methods

[0168] FM Mode Frequency minimum point / Hz Steady state frequency deviation / Hz Frequency change rate / Hz No wind power 49.62 -0.149 -0.298 Wind power without frequency regulation 49.55 -0.188 -0.361 Wind power frequency regulation 49.63 -0.149 -0.297 Wind storage frequency modulation 49.71 -0.149 -0.257

[0169] from Figure 6 As shown in Table 2, wind power participation in frequency regulation provides inertial response and frequency regulation reserve capacity, which increases the lowest frequency point of the system under disturbance, reduces the steady-state frequency deviation, and achieves the level when there is no wind power connected to the system; the frequency change rate is reduced, indicating that the inertial response of wind turbines is faster than that of traditional power sources. Wind-storage combined frequency regulation takes advantage of the fast response of energy storage, further reduces the system frequency change rate, increases the lowest frequency point, and enhances the transient frequency stability of the system.

[0170] Depend on Figure 7 It can be seen that inertial control responds quickly to changes in system frequency, but its duration is limited, which increases the system's inertial response capability and reduces the system's lowest frequency point and rate of change; variable pitch control is affected by its own mechanical properties and has a slow response speed, but it provides greater power and a longer duration, providing the system with primary frequency modulation power and reducing the system's steady-state frequency deviation; during the transition process between the two, the frequency modulation power provided by wind power is temporarily insufficient, affecting the rapid recovery of the system frequency.

[0171] At rated wind speed, the wind power penetration rate is 20%. The simulation analysis results of the system frequency characteristic changes and energy storage demand under the energy storage frequency regulation and wind storage combined frequency regulation operation modes are as follows: Fig. 9 and Fig.10As shown in the figure, wind-storage combined frequency regulation not only has the frequency characteristics of energy storage frequency regulation alone, but also improves the inertial response capability of the system, reduces the rate of change of system frequency, and improves the frequency stability of the system. As can be seen from Table 3 below: the power (20MW) and capacity (41.7kWh) of the energy storage configuration meet the requirements of energy storage power (15.8MW) and capacity (12.2kWh) during wind-storage combined frequency regulation; the power and capacity required for wind-storage combined frequency regulation are 67% and 11.1% of energy storage frequency regulation alone, indicating that compared with energy storage frequency regulation alone, wind-storage combined frequency regulation significantly reduces the power and capacity requirements of energy storage, reduces the cost of energy storage, and improves the economic feasibility of energy storage participating in wind power frequency regulation.

[0172] Table 3: Comparison of power and capacity requirements for energy storage frequency regulation and wind and storage combined frequency regulation

[0173]

[0174]

[0175] The present invention also provides an energy storage capacity configuration analysis system based on a frequency characteristic model of a power system under wind and storage combined frequency regulation, comprising:

[0176] A parameter determination module, used to determine the frequency control models of different frequency modulation units and the system parameters of each frequency modulation unit;

[0177] The model building module is used to establish the frequency characteristic model of the power system under the wind-storage joint frequency regulation based on the frequency control model of different frequency regulation units and the participation degree of each frequency regulation unit under different frequency regulation modes;

[0178] The demand configuration module is used to configure the energy storage capacity of the power system frequency characteristic model in the wind-storage joint frequency regulation, and use the rated power of the wind farm to generate electricity to meet the power and capacity configuration requirements at any wind speed;

[0179] The simulation analysis module is used to establish a simulation model corresponding to the power system frequency characteristic model based on the simulation platform according to the power system frequency characteristic model and configuration requirements, and to conduct simulation experiments to analyze and obtain performance comparison charts under different modes.

[0180] The present invention uses a wind-storage combined frequency modulation method to enable the wind farm to have an inertial response and primary frequency modulation capability similar to that of traditional power sources such as hydropower units and thermal power units, and further improves the frequency characteristics of the power system under high wind power penetration, reducing the frequency change rate and the maximum frequency deviation; through the complementary characteristics of different frequency modulation methods, energy storage makes up for the shortcomings of short rotor inertia duration and slow pitch control response of wind turbines, thereby improving the practicability of the wind-storage combined frequency modulation technology.

[0181] The specific working process and technical effects of the above system are the same as those in the above embodiment and will not be described in detail here.

[0182] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under the wind-storage combined frequency modulation as described in any one of the above items are implemented, including determining the frequency control models of different frequency modulation units and the system parameters of each frequency modulation unit; establishing the frequency characteristic model of the power system under the wind-storage combined frequency modulation based on the frequency control models of different frequency modulation units and according to the participation degree of each frequency modulation unit under different frequency modulation modes; configuring the energy storage capacity of the frequency characteristic model of the power system in the wind-storage combined frequency modulation, and using the rated power of the wind farm to generate electricity to meet the configuration requirements of power and capacity at any wind speed; establishing a simulation model corresponding to the frequency characteristic model of the power system based on a simulation platform according to the power system frequency characteristic model and the configuration requirements, and conducting simulation experiments to analyze and obtain performance comparison diagrams under different modes.

[0183] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under the wind-storage combined frequency modulation as described in any of the above items are implemented, including determining the frequency control models of different frequency modulation units and the system parameters of each frequency modulation unit; establishing the frequency characteristic model of the power system under the wind-storage combined frequency modulation based on the frequency control models of different frequency modulation units and according to the participation degree of each frequency modulation unit under different frequency modulation modes; configuring the energy storage capacity of the power system frequency characteristic model in the wind-storage combined frequency modulation, and using the rated power of the wind farm to generate electricity to meet the power and capacity configuration requirements at any wind speed; establishing a simulation model corresponding to the power system frequency characteristic model based on a simulation platform according to the power system frequency characteristic model and configuration requirements, and conducting simulation experiments to analyze and obtain performance comparison charts under different modes.

[0184] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0185] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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.

[0186] 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.

[0187] 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. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0188] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0189] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for analyzing energy storage capacity configuration based on a frequency characteristic model of a power system under wind and energy storage combined frequency regulation, characterized in that: The following steps are involved: Determining frequency control models of different frequency modulation units and system parameters of each of the frequency modulation units; Based on the frequency control models of different frequency regulation units, and according to the participation degree of each frequency regulation unit under different frequency regulation modes, a frequency characteristic model of the power system under wind-storage joint frequency regulation is established; The energy storage capacity of the power system frequency characteristic model described in the wind-storage joint frequency regulation is configured, and the rated power of the wind farm is used for power generation to meet the power and capacity configuration requirements at any wind speed; According to the power system frequency characteristic model and configuration requirements, a simulation model corresponding to the power system frequency characteristic model is established based on a simulation platform, and simulation experiments are carried out to analyze and obtain performance comparison diagrams under different modes.

2. The energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under wind and storage combined frequency regulation according to claim 1 is characterized in that: The frequency regulation unit includes a thermal power unit, a hydropower unit, a wind farm, energy storage and a load. The system parameters of the frequency regulation unit include a primary frequency regulation droop coefficient R, a load power increment ΔP L , thermal power generation unit power increment ΔP R , Hydropower unit power generation increment ΔP H , Wind farm power generation increment ΔP W , Energy storage system power generation increment ΔP E ′, the deviation between the actual frequency and the rated frequency Δf, and the deviation between the generated power and the load power in the system ΔP.

3. The energy storage capacity configuration analysis method based on the power system frequency characteristic model under wind and energy storage combined frequency modulation according to claim 2 is characterized in that: The transfer function G(s) of the frequency control model of the system when the frequency modulation unit does not participate in frequency modulation is: The transfer function G of the frequency control model when the thermal power unit participates in frequency regulation R (s) is: Transfer function G of frequency control model when hydropower units participate in frequency regulation H (s) is: Wherein, Δf is the deviation between the actual frequency and the rated frequency, ΔP is the deviation between the power generation and the load power in the system, M=2H, H is the inertia constant, s is the complex frequency variable in the Laplace transform, and D is the damping constant; K R is the regulation gain of the thermal power unit, T R is the time constant of the thermal power unit, K H is the regulation gain of the hydropower unit, T H is the time constant of the hydropower unit.

4. The energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under wind and energy storage combined frequency regulation according to claim 3 is characterized in that: The transfer function G'(s) of the frequency control model of the system when the wind farm is connected to the system but does not participate in frequency regulation is: M′=(1-p)M The transfer function G of the frequency control model when the wind farm participates in frequency modulation through rotor inertia control is ω (s) is: The transfer function G of the frequency control model when the wind farm participates in frequency modulation through variable pitch control is β (s) is: The transfer function G of the frequency control model when the wind farm participates in frequency modulation through rotor inertia and variable pitch control is W (s) is: Wherein, M' is the equivalent inertia constant, p is the wind power penetration rate of the wind farm, Δf is the deviation between the actual frequency and the rated frequency, ΔP is the deviation between the power generation and the load power in the system, s is the complex frequency variable in the Laplace transform, and D' is the damping constant; k df is the inertial response coefficient, T ω is the rotor inertia response time constant, ΔP ω Provide power for rotor inertia; k pf is the primary frequency modulation coefficient, T β is the pitch response time constant, ΔP B Provides power for pitch control.

5. The energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under wind and storage combined frequency regulation according to claim 4 is characterized in that: The transfer function G of the frequency control model when the energy storage is connected to the system but does not participate in frequency regulation E (s) is: The transfer function G′ of the frequency control model when the energy storage is connected to the system and participates in frequency modulation E (s) is: The transfer function G' of the frequency control model of the system when the wind farm and energy storage are connected to the system but do not participate in frequency regulation S (s) is: The transfer function G of the frequency control model when the wind farm and the energy storage form a wind-storage combined system WE (s) is: Among them, ΔP E To provide power when only energy storage is used to participate in frequency regulation, ΔP E ′ is the power increment of the energy storage system, ΔP W is the power increment of the wind farm, Δf is the deviation between the actual frequency and the rated frequency, M' S is the equivalent inertia constant, D' S is the damping constant, s is the complex frequency variable in the Laplace transform; k df is the inertial response coefficient, k pf is the primary frequency modulation coefficient, T ω is the rotor inertia response time constant, T β is the pitch response time constant, T E is the time constant of energy storage response; G W (s) is the transfer function of the frequency control model when the wind farm participates in frequency regulation through rotor inertia and variable pitch control.

6. The energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under wind and energy storage combined frequency regulation according to claim 5 is characterized in that: In the power system frequency characteristic model, when there is no wind farm connected, the frequency regulation unit is a thermal power unit and a hydropower unit, the power generation is determined as the participation measurement value, and the power generation participation of the thermal power unit is set to x. The frequency characteristic function G when there is no wind farm connected s_o (s) is: When the wind farm is connected but does not participate in frequency regulation, the frequency regulation units are thermal power units and hydropower units, the power generation is determined as the participation measurement value, and the wind power penetration rate of the wind farm is p. Then the frequency characteristic function G when the wind farm is connected but does not participate in frequency regulation is s_W (s) is: When wind farms and energy storage jointly regulate frequency, the frequency regulation units are thermal power units, hydropower units, wind farms and energy storage. Then the frequency characteristic function G when wind farms and energy storage jointly participate in frequency regulation is s_WEF (s) is: Frequency characteristic function G when wind farm participates in frequency modulation s_Wf (s) is: Frequency characteristic function G when energy storage participates in frequency modulation s_Ef (s) is: Where Δf is the deviation between the actual frequency and the rated frequency, ΔP L is the load power increment, G(s) is the transfer function of the frequency control model of the system when the frequency modulation unit does not participate in the frequency modulation, G R (s) is the transfer function of the frequency control model when the thermal power unit participates in frequency regulation, G H (s) is the transfer function of the frequency control model when the hydropower unit participates in frequency regulation; G'(s) is the transfer function of the frequency control model when the wind farm is connected to the system but does not participate in frequency regulation, G' S (s) is the transfer function of the frequency control model of the system when the wind farm and energy storage are connected to the system but do not participate in frequency regulation, G WE (s) is the transfer function of the frequency control model when the wind farm and the energy storage form a wind-storage combined system, G W (s) is the transfer function of the frequency control model when the wind farm participates in frequency regulation through rotor inertia and variable pitch control, G E (s) is the transfer function of the frequency control model when energy storage is connected to the system but does not participate in frequency regulation.

7. The energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under wind and energy storage combined frequency regulation according to claim 6 is characterized in that: The establishment of the frequency characteristic model of the power system under the wind-storage combined frequency regulation includes: using the final value theorem to analyze the frequency characteristics of the system, and the steady-state frequency deviation Δf of the system when it is only subjected to load disturbance ss for: The steady-state frequency deviation Δf of the system when there is no wind farm connected ss_0 for: The steady-state frequency deviation Δf of the system under high wind farm penetration ss_W for: The steady-state frequency deviation Δf of the system when the wind farm participates in frequency regulation and wind power storage jointly regulates frequency ss_Wf for: Among them, ΔP L is the load power increment, p is the wind power penetration rate of the wind farm, k pf is the primary frequency modulation coefficient, D is the damping constant, and R is the primary frequency modulation droop coefficient.

8. The energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under wind and energy storage combined frequency regulation according to claim 7 is characterized in that: In the wind-storage combined frequency regulation, when the wind farm provides inertial response, the configuration requirement satisfies the following formula: When the wind farm provides primary frequency regulation, the configuration requirements meet the following formula: When a wind farm provides primary frequency regulation through pitch control and energy storage, the configuration requirements meet the following formula: Among them, P h The required power to provide inertial response for the wind farm, P W is the rated power of the wind farm, H is the inertia constant of the power system, is the frequency change rate, E h The required capacity to provide inertial response for wind farms, is the rated frequency of the wind farm, is the minimum frequency of the wind farm; P p Provide the required power for primary frequency regulation for the wind farm, Δf is the deviation between the actual frequency and the rated frequency, f r The actual frequency of the primary frequency regulation provided by the wind farm, R is the primary frequency regulation droop coefficient, E p Provide the required capacity for primary frequency regulation for wind farms, T d is the duration of a frequency regulation of the wind farm; ΔP β The wind farm provides the required power for primary frequency regulation through pitch change, T β is the pitch response time constant, ΔP E ′ is the power required for primary frequency regulation provided by energy storage, E E Provide the required capacity for primary frequency regulation for energy storage.

9. An energy storage capacity configuration analysis system based on the frequency characteristic model of the power system under wind and storage combined frequency regulation, characterized in that: include: A parameter determination module, used to determine frequency control models of different frequency modulation units and system parameters of each of the frequency modulation units; A model building module is used to build a frequency characteristic model of the power system under wind-storage joint frequency regulation based on the frequency control models of different frequency regulation units and the participation degree of each frequency regulation unit under different frequency regulation modes; The demand configuration module is used to configure the energy storage capacity of the power system frequency characteristic model described in the wind-storage joint frequency regulation, and to generate electricity using the rated power of the wind farm to meet the configuration requirements of power and capacity at any wind speed; The simulation analysis module is used to establish a simulation model corresponding to the power system frequency characteristic model based on a simulation platform according to the power system frequency characteristic model and configuration requirements, and to conduct simulation experiments to analyze and obtain performance comparison diagrams under different modes.

10. An electronic device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under the combined frequency regulation of wind and storage are implemented as described in any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, which, when executed by a processor, implements the steps of the energy storage capacity configuration analysis method based on the frequency characteristic model of the power system under wind-storage combined frequency regulation as described in any one of claims 1 to 8.

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