A transient voltage support method, apparatus, equipment, and storage medium for an energy storage converter.

Abstract

This application provides a transient voltage support method, apparatus, device, and storage medium for an energy storage converter, relating to the field of grid-connected conversion technology. The transient voltage support method for the energy storage converter includes: acquiring preset reference value data and output electrical information of the energy storage converter; responding to the output electrical information, obtaining active power information, reactive power information, and voltage amplitude information at the grid connection point; responding to one or more of the preset reference value data, the active power information, the reactive power information, and the voltage amplitude information, obtaining grid-connected control data for the energy storage converter; and controlling the energy storage converter to perform transient voltage support regulation for grid-connected conversion using the grid-connected control data. This method can improve the transient voltage support capability of the energy storage converter and enhance the stability of grid-connected control.

Description

Technical Field

[0001] This application relates to the field of grid-connected conversion technology, and more specifically, to a transient voltage support method, apparatus, equipment, and storage medium for an energy storage converter. Background Technology

[0002] Currently, with the continuous development of new energy power generation technologies, the application of distributed generation and microgrid technologies is becoming increasingly widespread. In new power systems utilizing distributed generation or microgrid technologies, energy storage technology can improve power supply reliability and flexibility, playing a crucial role in these systems. Energy storage converters serve as the grid connection interface for energy storage equipment, including electrochemical energy storage devices.

[0003] Generally, energy storage converters controlled by vector control methods can adjust the magnitude and angle of their output voltage or frequency. However, vector control relies on the grid-generated frequency and internal power source. Energy storage converters controlled by self-synchronizing voltage sources, on the other hand, can autonomously construct their own frequency and internal power source. However, when the grid experiences transient low or overvoltage conditions due to short circuits, DC blocking, or other reasons, the energy storage converter is prone to several problems, including but not limited to overcurrent, excessively low or high grid connection point voltage, power angle fluctuations, and instability. These problems not only pose a threat to equipment safety but also adversely affect the transient processes of the power grid. Summary of the Invention

[0004] The purpose of this application is to provide a transient voltage support method, apparatus, equipment, and storage medium for an energy storage converter, which can improve the transient voltage support capability of the energy storage converter and enhance the stability of grid-connected regulation.

[0005] In a first aspect, this application provides a transient voltage support method for an energy storage converter, comprising:

[0006] Acquire preset reference value data and output electrical information of the energy storage converter;

[0007] In response to the output electrical information, the active power information, reactive power information, and voltage amplitude information of the grid connection point are obtained;

[0008] In response to one or more of the preset reference value data, the active power information, the reactive power information, and the voltage amplitude information, the grid-connected control data of the energy storage converter is obtained, and the transient voltage support control of the energy storage converter for grid-connected conversion is controlled through the grid-connected control data.

[0009] In the above implementation process, the transient voltage support method of the energy storage converter obtains grid-connected control data of the energy storage converter based on preset reference value data and the output electrical information of the energy storage converter. By limiting the reference value of active power, applying damping to the active power frequency control loop, dynamically modifying the reactive voltage droop coefficient, and actively limiting the output current of the converter through grid-connected control data, the energy storage converter can not only adaptively output the reactive power to support the voltage amplitude of the grid connection point, but also prevent the power angle acceleration process during the transient period, thereby avoiding the power angle instability problem as much as possible, improving the transient voltage support capability of the energy storage converter and improving the stability of grid-connected control.

[0010] Further, the preset reference value data includes reactive power reference values ​​and voltage amplitude reference values, and the grid-connected control data includes internal potential amplitude. In response to one or more of the preset reference value data, the active power information, the reactive power information, and the voltage amplitude information, the grid-connected control data of the energy storage converter is obtained, including:

[0011] In response to the reactive power reference value, the voltage amplitude reference value, the reactive power information, and the voltage amplitude information, the internal potential amplitude of the energy storage converter is obtained.

[0012] In the above implementation process, the internal potential amplitude of the energy storage converter is calculated and obtained by using reactive power reference value, voltage amplitude reference value, reactive power information and voltage amplitude information. The internal potential amplitude of the energy storage converter is then used to participate in the grid connection conversion process of the energy storage converter, and to control the switching signals of the power electronic switches in the energy storage converter to improve the stability of grid connection regulation.

[0013] Furthermore, the preset reference value data also includes an active power reference value, and the method further includes:

[0014] In response to the active power reference value, an active power limit value is obtained.

[0015] In the above implementation process, the active power reference value of the energy storage converter is limited by the active power limiting value to prevent the active power reference value from exceeding the threshold, thereby further improving the stability of grid-connected regulation.

[0016] Further, the grid-connected control data includes frequency information and phase angle information. In response to one or more of the preset reference value data, the active power information, the reactive power information, and the voltage amplitude information, the grid-connected control data of the energy storage converter is obtained, including:

[0017] In response to the active power limit value and the active power information, the frequency information and phase angle information of the energy storage converter are obtained.

[0018] In the above implementation process, the frequency and phase angle information of the energy storage converter are obtained by calculating the active power limit value and active power information. The frequency and phase angle information of the energy storage converter are then used to participate in the grid connection conversion process of the energy storage converter, and to control the switching signals of the power electronic switches in the energy storage converter to improve the stability of grid connection regulation.

[0019] Further, in response to the active power limiting value and the active power information, the frequency information and phase angle information of the energy storage converter are obtained, including:

[0020] In response to the droop control output signal, the transient droop control output signal, the active power limit value, and the active power information, and performing rotor simulation, the frequency information of the energy storage converter is obtained.

[0021] In response to the frequency information, the droop control output signal, the transient droop control output signal, and the phase angle information of the energy storage converter are obtained.

[0022] Furthermore, the method also includes:

[0023] Obtain the current limiting value information of the energy storage converter;

[0024] The active power limit is determined based on the voltage amplitude information, the current limit information, and the reactive power information, wherein the active power limit includes an upper limit and a lower limit.

[0025] In the above implementation process, the active power limit value is calculated and obtained by using voltage amplitude information, current limit value information and reactive power information to avoid the active power reference value from exceeding the threshold, thereby further improving the stability of grid-connected regulation.

[0026] Further, in response to the reactive power reference value, the voltage amplitude reference value, the reactive power information, and the voltage amplitude information, the internal potential amplitude of the energy storage converter is obtained, including:

[0027] In response to the reactive power reference value and the reactive power information, a reactive power droop output signal is obtained;

[0028] In response to the voltage amplitude reference value and the voltage amplitude information, a voltage droop output signal is obtained;

[0029] The internal potential amplitude of the energy storage converter is obtained in response to the reactive power droop output signal and the voltage droop output signal.

[0030] In the above implementation process, the internal potential amplitude is calculated and obtained through the reactive power droop output signal and the voltage droop output signal. The internal potential amplitude of the energy storage converter participates in the grid-connected conversion process of the energy storage converter, and controls the switching signals for the on and off of the power electronic switches in the energy storage converter, so as to improve the stability of grid-connected regulation.

[0031] Furthermore, the grid-connected control data includes one or more of the following: internal potential amplitude, frequency information, and phase angle information; the method further includes:

[0032] In response to one or more of the internal potential amplitude, the frequency information, and the phase angle information, the current amplitude output by the energy storage converter is limited through inner loop control.

[0033] In the above implementation process, the energy storage converter control method limits the current amplitude output by the energy storage converter through the inner loop control module to prevent the current output by the energy storage converter from exceeding the threshold.

[0034] Furthermore, the output electrical information of the energy storage converter includes output voltage information and output current information, and the method further includes:

[0035] In response to the output voltage information, phase information, and internal potential amplitude, a current command value is obtained;

[0036] A current reference value is obtained by limiting the current based on the current command value.

[0037] Furthermore, the method also includes:

[0038] Closed-loop control is performed on the output current information based on the current reference value.

[0039] Secondly, this application provides a transient voltage support device for an energy storage converter, comprising:

[0040] The acquisition unit is used to acquire preset reference value data and the output electrical information of the energy storage converter;

[0041] The grid connection point unit, in response to the output electrical information, obtains the active power information, reactive power information, and voltage amplitude information of the grid connection point;

[0042] The grid-connected control unit is used to respond to one or more of the preset reference value data, the active power information, the reactive power information and the voltage amplitude information to obtain the grid-connected control data of the energy storage converter, and to control the transient voltage support control of the energy storage converter for grid-connected conversion through the grid-connected control data.

[0043] Furthermore, the preset reference value data includes reactive power reference value and voltage amplitude reference value, the grid-connected control data includes internal potential amplitude, and the grid-connected control unit is also used to: obtain the internal potential amplitude of the energy storage converter in response to the reactive power reference value, the voltage amplitude reference value, the reactive power information and the voltage amplitude information.

[0044] Furthermore, the preset reference value data also includes an active power reference value, and the grid-connected control unit is further configured to: obtain an active power limit value in response to the active power reference value.

[0045] Furthermore, the grid-connected control data includes frequency information and phase angle information, and the grid-connected control unit is also used to: obtain the frequency information and phase angle information of the energy storage converter in response to the active power limit value and the active power information.

[0046] Furthermore, the grid-connected control unit is also used to: respond to the droop control output signal, the transient droop control output signal, the active power limit value, and the active power information and perform rotor simulation to obtain the frequency information of the energy storage converter; and respond to the frequency information to obtain the droop control output signal, the transient droop control output signal, and the phase angle information of the energy storage converter.

[0047] Furthermore, the acquisition unit is also configured to: acquire the current limiting value information of the energy storage converter; and determine the active power limiting value based on the voltage amplitude information, the current limiting value information, and the reactive power information, wherein the active power limiting value includes an upper limiting limit and a lower limiting limit.

[0048] Furthermore, the grid-connected control unit is also configured to: obtain a reactive power droop output signal in response to the reactive power reference value and the reactive power information; obtain a voltage droop output signal in response to the voltage amplitude reference value and the voltage amplitude information; and obtain the internal potential amplitude of the energy storage converter in response to the reactive power droop output signal and the voltage droop output signal.

[0049] Furthermore, the grid-connected control data includes one or more of internal potential amplitude, frequency information, and phase angle information. The grid-connected control unit is also used to: in response to one or more of the internal potential amplitude, frequency information, and phase angle information, limit the current amplitude output by the energy storage converter through inner loop control.

[0050] Furthermore, the output electrical information of the energy storage converter includes output voltage information and output current information. The grid-connected control unit is also used to: obtain a current command value in response to the output voltage information, the phase information and the internal potential amplitude; and limit the current according to the current command value to obtain a current reference value.

[0051] Furthermore, the grid-connected control unit is also used to: perform closed-loop control of the output current information based on the current reference value.

[0052] Thirdly, this application provides a control device for an energy storage converter, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described in any of the first aspects.

[0053] Fourthly, this application provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the method described in any of the first aspects.

[0054] Fifthly, this application provides a computer program product that, when run on a computer, causes the computer to perform the method described in any of the first aspects.

[0055] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0056] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0057] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 A flowchart illustrating a transient voltage support method for an energy storage converter provided in an embodiment of this application;

[0059] Figure 2 A flowchart illustrating one implementation of the transient voltage support method for an energy storage converter provided in this application embodiment;

[0060] Figure 3 A flowchart illustrating a second implementation of the transient voltage support method for an energy storage converter provided in this application embodiment;

[0061] Figure 4A schematic diagram of a network topology for grid-connected control of a self-synchronizing voltage source based on an energy storage converter, provided for an embodiment of this application;

[0062] Figure 5 A schematic diagram of simulation results for a conventional self-synchronizing voltage source control strategy under low voltage fault conditions provided in an embodiment of this application;

[0063] Figure 6 This is a schematic diagram of simulation results for a transient voltage support control method using an energy storage converter under low voltage fault conditions, provided in an embodiment of this application.

[0064] Figure 7 A schematic diagram of simulation results for a self-synchronizing voltage source control strategy under transient high voltage conditions provided in an embodiment of this application;

[0065] Figure 8 This is a schematic diagram of the simulation results of a transient voltage support control method using an energy storage converter under transient high voltage conditions, provided in an embodiment of this application.

[0066] Figure 9 A structural block diagram of the transient voltage support device for the energy storage converter provided in the embodiments of this application;

[0067] Figure 10 This is a structural block diagram of a control device for an energy storage converter provided in an embodiment of this application. Detailed Implementation

[0068] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0069] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0070] Energy storage converters can include one or more grid-connected interfaces, through which electrochemical energy storage equipment, new energy power generation equipment, and other devices can be connected to the power grid. Self-synchronizing voltage source controlled energy storage converters can autonomously construct their frequency and internal potential, whereas traditional vector control methods rely on grid generation. Therefore, self-synchronizing voltage sources play a crucial role in improving problems such as voltage exceeding limits, insufficient reactive power, wide-frequency oscillations, and synchronization instability caused by characteristics like "low inertia" and "low short-circuit ratio" in areas with high new energy penetration.

[0071] However, when using a self-synchronizing voltage source to control an energy storage converter, the converter's current withstand capability is very limited, thus restricting its reactive power output. Furthermore, its ability to provide transient support for the voltage amplitude at the grid connection point is limited during periods of low or overvoltage in the grid. Effectively supporting the voltage amplitude at the grid connection point within the constrained current output range, while simultaneously preventing the energy storage converter from experiencing power angle fluctuations and instability, remains a challenging technical challenge.

[0072] To address the aforementioned issues, this application proposes a transient voltage support method for an energy storage converter. The method can be implemented by either the control device of the energy storage converter or a power energy storage system. Based on preset reference value data and the output electrical information of the energy storage converter, this transient voltage support method obtains grid-connected control data for the energy storage converter. By limiting the reference value of active power, applying damping to the active power frequency control loop, dynamically modifying the reactive voltage droop coefficient, and actively limiting the converter's output current, the method not only enables the energy storage converter to adaptively output the reactive power to support the voltage amplitude at the grid connection point but also prevents power angle acceleration during transient periods, thereby minimizing power angle instability and improving the transient voltage support capability and grid-connected control stability of the energy storage converter.

[0073] Please see Figure 1 , Figure 1 This is a flowchart illustrating a transient voltage support method for an energy storage converter provided in an embodiment of this application. The transient voltage support method for the energy storage converter includes the following steps:

[0074] S100: Acquire preset reference value data and output electrical information of the energy storage converter;

[0075] S200: In response to the output electrical information, obtain the active power information, reactive power information and voltage amplitude information of the grid connection point;

[0076] S300: In response to one or more of preset reference value data, active power information, reactive power information and voltage amplitude information, obtain grid-connected control data of the energy storage converter, and control the energy storage converter to perform transient voltage support control for grid-connected conversion through the grid-connected control data.

[0077] For example, the preset reference value data in the embodiments of this application may include active power reference value, reactive power reference value, voltage amplitude reference value, etc.; thereby, based on the active power reference value, reactive power reference value, and voltage amplitude reference value, the corresponding electrical parameters are limited or otherwise operated.

[0078] The output electrical information of the energy storage converter includes the output current information and output voltage information of the energy storage converter at the grid connection point. The transient voltage support method of the energy storage converter is based on preset reference value data and the output electrical information of the energy storage converter to obtain the grid connection control data of the energy storage converter. Through the grid connection control data, measures such as limiting the reference value of active power, applying damping to the active power frequency control loop, dynamically modifying the reactive voltage droop coefficient, and actively limiting the output current of the converter can be taken. This not only enables the energy storage converter to adaptively output the reactive power to support the voltage amplitude at the grid connection point, but also prevents the power angle acceleration process during the transient period, thereby avoiding the power angle instability problem as much as possible, improving the transient voltage support capability of the energy storage converter and improving the stability of grid connection control.

[0079] Please see Figure 2 and Figure 3 , Figure 2 This is a flowchart illustrating one implementation of the transient voltage support method for an energy storage converter provided in an embodiment of this application. Figure 3 A flowchart illustrating a second implementation of the transient voltage support method for an energy storage converter provided in this application embodiment; the transient voltage support method for the energy storage converter is applied to the following three modules (first module, second module, and third module):

[0080] Module 1: Based on the voltage amplitude information U of the energy storage converter at the grid connection point s Current limit value information I lim Reactive power information Q at the grid connection point s The limit value for calculating the active power reference value is calculated using the following formula:

[0081]

[0082] In the formula: P max P is the upper limit of the active power reference value. min U is the lower limit of the active power reference value. s For the voltage amplitude information of the grid connection point, I lim The current limiting value information for the energy storage converter, Q s This refers to the reactive power information of the grid connection point;

[0083] The second module includes the following sub-modules: 1) Rotor simulation sub-module; 2) Droop control sub-module; 3) Transient droop control sub-module; 4) Phase angle generation sub-module; Optionally, the transfer function of each sub-module of the second module is:

[0084] The rotor simulation submodule:

[0085] The droop control submodule: P d1 =D·ω;

[0086] The transient droop control submodule:

[0087] The phase angle generation submodule:

[0088] In the formula, P ref P is the active power reference value. s The active power information of the grid connection point, P d1 P is the output of the droop control submodule. d2 ω is the output of the transient droop control submodule, ω is the frequency information of the energy storage converter, ω is also the output of the rotor simulation module, ω is also the input of the droop control submodule, the transient droop control submodule, and the phase angle generation submodule, δ is the phase angle information of the energy storage converter, δ is also the output of the phase angle generation submodule, H,D,T d D dyn ,ω n These are preset parameters.

[0089] Optionally, the droop control submodule in the second module is used to characterize the active frequency droop coefficient of the energy storage converter, i.e., the Pf droop coefficient used for primary frequency regulation; it also represents the damping of the power angle swing. The transient droop control submodule is used to increase the damping of the power angle swing while keeping the Pf droop coefficient constant.

[0090] In some possible implementations, the parameters H,D,T d D dyn ,ω n The values ​​are respectively:

[0091] H = 5, D = 25, T d =10,T dyn =40,ω n =100π.

[0092] Where H represents the inertial time constant, which is usually set to 3s to 10s;

[0093] D: Represents the Pf droop coefficient, which is usually set to 20-50;

[0094] T d : Represents the transient droop time constant, usually set to 2s to 10s;

[0095] D dyn : Represents the transient droop coefficient, recommended setting is 40-100;

[0096] ω n : Represents the rated angular frequency of the power grid, with a value of 100π = 314.1593 rad / s;

[0097] It should be noted that the specific parameter settings mentioned above are for reference only and not specific limitations. The corresponding parameters can be adjusted according to the actual situation. Similarly, the specific parameter settings in the following text are also for reference only and not specific limitations. The corresponding parameters can be adjusted according to the actual situation, and will not be elaborated here.

[0098] The third module includes the following sub-modules: 1) Reactive power droop sub-module; 2) Voltage droop sub-module; 3) Internal potential regulation sub-module. The transfer function of each sub-module is as follows:

[0099] The reactive power drooping submodule: ε q =K q ·(Q ref -Q s );

[0100] The voltage droop submodule: ε v =K v ·(U ref -U s );

[0101] The internal potential regulation submodule:

[0102] In the formula: Q ref Q is the reference value for reactive power. s ε is the reactive power at the grid connection point. q For the output of the reactive power drooping submodule, U ref U is the reference value for the voltage amplitude. s Let ε be the voltage amplitude at the grid connection point. v For the output of the voltage droop submodule, ε q and ε v Simultaneously, E is the input of the internal potential adjustment submodule, E is the amplitude of the internal potential, and E is also the output of the internal potential adjustment submodule, K q ,K v ,T v Let K be a parameter, where K is a parameter. q This is called the reactive power droop factor, K. v This is called the voltage droop factor;

[0103] In one possible implementation, the integrator of the internal potential regulation submodule is limited by maximum and minimum values.

[0104] In a possible implementation, the reactive power droop coefficient K of the reactive power droop submodule and the voltage droop submodule q and the voltage droop coefficient K v It is a function of the voltage amplitude at the grid connection point.

[0105] In one possible implementation, the expression for the grid connection point voltage amplitude function is:

[0106]

[0107] Where: K q(v) The term K refers to the reactive power droop coefficient. q Or the voltage droop coefficient K v K q(v)0 and K q(v)1 U refers to the reactive power droop factor or voltage droop factor under normal and transient conditions, respectively. s,1 ~U s,4 There are four increasing voltage amplitudes, and they satisfy U s,1 s,2 <1 s,3 s,4 .

[0108] In some embodiments, the values ​​of the relevant parameters are as follows:

[0109] K q0 =1.0,K q1 =0.1,K v0 =0.1,K v1 =1.0;

[0110] U s1 =0.85,U s2 =0.90,U s3 =1.10,U s4 =1.15;

[0111] In one possible implementation, this application is for K q(v) The calculation is explained below:

[0112] K q0 and K u0 The design is generally based on the reactive power and voltage control objectives of the virtual synchronous machine under normal conditions; for example, if the reactive power and voltage control objective is constant reactive power, then K can be set. q0 =1,K u0 =0; if the control target is a constant voltage, then K can be set to 0. q0 =0,K u0 =1; if the reactive voltage needs to satisfy a certain droop factor K qu Then K can be set. q0 :K u0 =K qu ;

[0113] To achieve better transient voltage support, K q1 and K u1 It should satisfy: K q1 :K​​​u1 =0 to 0.1;

[0114] U s2 and U s3 These are the standards for determining low voltage and overvoltage in the power grid (voltage below 0.9 pu is considered low voltage, and voltage above 1.1 pu is considered overvoltage);

[0115] Optionally, U s2 and U s3 The purpose of setting values ​​of 0.85 and 1.15 respectively is to make Figure 2 The reactive voltage droop coefficient is continuously varied to reduce oscillations; these two values ​​are recommended values.

[0116] It should be noted that these recommended values ​​are recommended in practical applications, otherwise they may affect the results; of course, the above recommended values ​​can be adjusted according to actual needs, which will not be elaborated here.

[0117] In some embodiments, the preset reference value data includes reactive power reference value and voltage amplitude reference value, and the grid-connected control data includes internal potential amplitude. S300: In response to one or more of the preset reference value data, active power information, reactive power information, and voltage amplitude information, obtain grid-connected control data of the energy storage converter, including:

[0118] The internal potential amplitude of the energy storage converter is obtained in response to the reactive power reference value, voltage amplitude reference value, reactive power information, and voltage amplitude information.

[0119] For example, the internal potential amplitude of the energy storage converter is calculated and obtained by using reactive power reference value, voltage amplitude reference value, reactive power information and voltage amplitude information. The internal potential amplitude of the energy storage converter is then used to participate in the grid-connected conversion process of the energy storage converter, and to control the switching signals for the on and off of the power electronic switches in the energy storage converter, so as to improve the stability of grid-connected regulation.

[0120] In some embodiments, the preset reference value data further includes an active power reference value, and the transient voltage support method for the energy storage converter further includes:

[0121] The active power limit value is obtained in response to the active power reference value.

[0122] For example, the active power reference value of the energy storage converter is limited by the active power limit value to prevent the active power reference value from exceeding the threshold, thereby further improving the stability of grid-connected regulation.

[0123] In some embodiments, the grid-connected control data includes frequency information and phase angle information. Responding to one or more of preset reference value data, active power information, reactive power information, and voltage amplitude information, grid-connected control data of the energy storage converter is obtained, including:

[0124] In response to the active power limit value and active power information, the frequency information and phase angle information of the energy storage converter are obtained.

[0125] For example, the frequency and phase angle information of the energy storage converter are calculated and obtained by using the active power limit value and active power information. The frequency and phase angle information of the energy storage converter are then used to participate in the grid connection conversion process of the energy storage converter, and to control the switching signals of the power electronic switches in the energy storage converter to improve the stability of grid connection regulation.

[0126] In some embodiments, in response to the active power limiting value and active power information, the frequency information and phase angle information of the energy storage converter are obtained, including:

[0127] The frequency information of the energy storage converter is obtained by responding to the droop control output signal, the transient droop control output signal, the active power limit value and the active power information, and performing rotor simulation.

[0128] In response to frequency information, the droop control output signal, transient droop control output signal, and phase angle information of the energy storage converter are obtained.

[0129] For example, combined Figure 2 The second module shown, P d1 For the output of the droop control submodule (droop control output signal), P d2 The output of the transient droop control submodule (transient droop control output signal) is used to obtain the frequency and phase information of the energy storage converter based on the above method.

[0130] In some embodiments, the transient voltage support method for the energy storage converter further includes:

[0131] Obtain the current limiting value information of the energy storage converter;

[0132] Based on voltage amplitude information, current limit information, and reactive power information, the active power limit is determined, which includes an upper limit and a lower limit.

[0133] For example, the active power limit value is calculated and obtained by using voltage amplitude information, current limit value information and reactive power information to avoid the active power reference value from exceeding the threshold, thereby further improving the stability of grid-connected regulation.

[0134] In some embodiments, in response to a reactive power reference value, a voltage amplitude reference value, reactive power information, and voltage amplitude information, the internal potential amplitude of the energy storage converter is obtained, including:

[0135] In response to the reactive power reference value and reactive power information, a reactive power droop output signal is obtained;

[0136] In response to the voltage amplitude reference value and voltage amplitude information, a voltage droop output signal is obtained;

[0137] The internal potential amplitude of the energy storage converter is obtained in response to the reactive power droop output signal and the voltage droop output signal.

[0138] For example, combined Figure 3 The third module shown, ε q For the output of the reactive power droop submodule (reactive power droop output signal), ε v The output of the voltage droop submodule (voltage droop output signal) is calculated and obtained by using the reactive power droop output signal and the voltage droop output signal. The internal potential amplitude is then used to participate in the grid-connected conversion process of the energy storage converter through the internal potential amplitude of the energy storage converter, and to control the switching signals for the on and off of the power electronic switches in the energy storage converter, so as to improve the stability of grid-connected regulation.

[0139] Please see Figure 4 , Figure 4 This is a schematic diagram of a network topology for grid-connected control of a self-synchronizing voltage source based on an energy storage converter, provided as an embodiment of this application. Figure 4 As shown, the grid-connected control system of the self-synchronizing voltage source includes a signal acquisition and processing module M1, an active power reference value limiting module M2, a power synchronization control module M3, a reactive power voltage control module M4, a virtual admittance control module M5, a current limiting module M6, a current inner loop control module M7, and a modulation and drive module M8, wherein:

[0140] Signal acquisition and processing module M1 is used to process the detected current i s and voltage u s By sampling and filtering, the three-phase voltage of the energy storage converter at the grid connection point is obtained. Three-phase current The active power information P at the grid connection point is obtained by calculating the grid connection point power and grid connection point voltage amplitude. s Reactive power information Q s and voltage amplitude information U s ;

[0141] The active power reference value limiting module M2, based on the voltage amplitude information U at the grid connection point, s Current limiting value I lim Reactive power information Q at the grid connection points Calculate the limit value for the active power reference value;

[0142] The power synchronization control module M3 is used to process the active power reference value P generated by the instruction generation unit. s0 With the active power P at the grid connection point s The deviation is used to generate the reference angular frequency ω (frequency information) of the energy storage converter through the control loop, and further the reference angle θ (phase angle information) of the energy storage converter is generated by integrating the reference angular frequency.

[0143] The reactive power voltage control module M4 is used to control the grid connection point voltage deviation (the grid connection point voltage reference value U generated by the instruction generation unit). s0 The grid connection point voltage U acquired by the signal acquisition and processing module M4 s (deviation) and reactive power deviation (reactive power reference value Q at the grid connection point generated by the instruction generation unit) s0 The reactive power Q at the grid connection point is acquired by the signal acquisition and processing module M4. s The weighted sum of the deviations is used as the error signal, which is then processed by the reactive power-voltage control parameter K. v The regulation and control generate a reference value E for the amplitude of the internal potential;

[0144] The formula for calculating the reference value E for generating the internal potential amplitude can be expressed as:

[0145]

[0146] Where E is the amplitude of the internal potential, and T v K is the time constant for integral control, used to represent the integral speed of the integrator. The larger this time constant, the slower the integral control. q and K v These are the reactive power droop coefficient and the voltage droop coefficient, which can be adjusted according to reactive power and voltage control requirements.

[0147] Based on the reference angle θ generated by the power synchronization control module M3 and the internal potential amplitude reference value E generated by module M4, the reference voltage u of the energy storage converter is generated through virtual admittance control M5, current limiting control M6, current inner loop control M7, and inverse Parker transformation. ref This enables the control objectives of the power synchronization control module M3 and the reactive voltage control module M4, namely, the control objectives of reducing active power deviation, reactive power deviation and grid connection point voltage deviation, to be achieved simultaneously.

[0148] The modulation and driving module M8 is used to generate the reference voltage U based on the reference voltage generated by the reference voltage generation module M3. refThe system generates drive signals to control the on / off switching of power electronic switches in the energy storage converter, thereby controlling and regulating the SOC of the energy storage device. This ensures that the voltage output from the energy storage device passes through the impedance X of the filter inductor in the energy storage converter. f Impedance X of grid connection point and inductive grid g Then, it is connected to the power grid.

[0149] In one possible implementation, the signal acquisition and processing module M1 calculates the active power P at the grid connection point based on the output current of the energy storage converter and the grid connection point voltage. s Reactive power Q at grid connection point s and grid connection point voltage amplitude U s The active power reference value of the energy storage converter is limited by the active power reference value limiting module M2; the frequency and phase angle of the energy storage converter are generated by the power synchronization control module M3 based on the active power and the active power reference value; the internal potential amplitude of the energy storage converter is generated by the reactive power and reactive power reference value, the voltage amplitude and the voltage amplitude reference value.

[0150] In one possible implementation, the upper and lower limits of the active power limit value in the active power reference value limiting module M2 are determined by the following formula:

[0151]

[0152] In the formula: P max P is the upper limit of the active power reference value. min U is the lower limit of the active power reference value. s I is the voltage amplitude at the grid connection point. lim Q is the current limiting value of the energy storage converter. s The reactive power at the grid connection point;

[0153] In a possible implementation, the power synchronization control module M3 includes the following sub-modules: 1) rotor simulation sub-module; 2) droop control sub-module; 3) transient droop control sub-module; and 4) phase angle generation sub-module. The transfer functions of each sub-module are:

[0154] The rotor simulation submodule:

[0155] The droop control submodule: P d1 =D·ω;

[0156] The transient droop control submodule:

[0157] The phase angle generation submodule:

[0158] In the formula: P ref P is the active power reference value. s P is the active power at the grid connection point. d1 P is the output of the droop control submodule. d2 ω is the output of the transient droop control submodule, ω is the frequency of the energy storage converter, ω is also the output of the rotor simulation module, ω is also the input of the droop control submodule, the transient droop control submodule, and the phase angle generation submodule, δ is the phase angle of the energy storage converter, δ is also the output of the phase angle generation submodule, H,D,T d D dyn ,ω n For parameters.

[0159] In one possible implementation, the reactive power voltage control module M4 includes the following sub-modules: 1) a reactive power droop sub-module; 2) a voltage droop sub-module; and 3) an internal potential regulation sub-module. The transfer functions of each sub-module are as follows:

[0160] The reactive power drooping submodule: ε q =K q ·(Q ref -Q s );

[0161] The voltage droop submodule: ε v =K v ·(U ref -U s );

[0162] The internal potential regulation submodule:

[0163] In the formula: Q ref Q is the reference value for reactive power. s ε is the reactive power at the grid connection point. q For the output of the reactive power drooping submodule, U ref U is the reference value for the voltage amplitude. s Let ε be the voltage amplitude at the grid connection point. v For the output of the voltage droop submodule, ε q and ε v Simultaneously, E is the input of the internal potential adjustment submodule, E is the amplitude of the internal potential, and E is also the output of the internal potential adjustment submodule, K q ,K v ,T v Let K be a parameter, where K is a parameter. q This is called the reactive power droop factor, K. v This is called the voltage droop factor;

[0164] In one possible implementation, the reactive droop coefficient K of the reactive droop submodule and the voltage droop submodule q and the voltage droop coefficient K v It is a function of the voltage amplitude at the grid connection point.

[0165] In one possible implementation, the energy storage converter control method limits the current amplitude output by the energy storage converter through an inner loop control module.

[0166] Optionally, the inner loop control module includes the following steps:

[0167] Virtual admittance control module M5: Based on the grid connection point voltage, the phase information (θ), and the internal potential amplitude, module M5 generates a current command value;

[0168] Current limiting module M6: Based on the current command value, module M6 limits the magnitude of the current command value and outputs a current reference value;

[0169] Current inner loop control module M7: Based on the current reference value and the current, module M7 performs closed-loop control on the magnitude of the current.

[0170] In some embodiments, the grid-connected control data includes one or more of internal potential amplitude, frequency information, and phase angle information, and the method further includes:

[0171] In response to one or more of the internal potential amplitude, frequency information, and phase angle information, the current amplitude output by the energy storage converter is limited through inner loop control.

[0172] For example, the energy storage converter control method limits the current amplitude output by the energy storage converter through an inner loop control module to prevent the current output by the energy storage converter from exceeding a threshold.

[0173] In some embodiments, the output electrical information of the energy storage converter includes output voltage information and output current information, and the method further includes:

[0174] The current command value is obtained in response to the output voltage information, phase information (θ) and internal potential amplitude;

[0175] A current reference value is obtained by limiting the current command value.

[0176] In some embodiments, the transient voltage support method for the energy storage converter further includes:

[0177] Closed-loop control of the output current information is performed based on the current reference value.

[0178] To verify the superiority of the transient voltage support method for the energy storage converter in the embodiments of this application, the self-synchronizing voltage source control transient voltage support method proposed in this application is simulated and verified in simulation software.

[0179] Please see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram illustrating simulation results of a conventional self-synchronizing voltage source control strategy under a low-voltage fault, as provided in an embodiment of this application. Figure 6 This is a schematic diagram of simulation results for a transient voltage support control method using an energy storage converter under low voltage fault conditions, provided in an embodiment of this application.

[0180] Figure 6 Simulation results of the transient voltage support control method for energy storage converters proposed in this application under low voltage fault conditions are presented. Figure 6 Fault conditions and Figure 5 While similar to the one mentioned earlier, it can be seen that it has a significant supporting effect on the grid connection point voltage, compared to... Figure 5 The voltage at the grid connection point is below 0.3 pu and shows a continuous downward trend. Figure 6 The voltage amplitude remained consistently around 0.65 pu. Furthermore, after the fault was resolved, the problem did not recur. Figure 5 The oscillations shown demonstrate that the proposed method can improve the stability of fault ride-through.

[0181] Please see Figure 7 and Figure 8 , Figure 7 This is a schematic diagram illustrating the simulation results of a self-synchronizing voltage source control strategy under transient high voltage conditions, as provided in an embodiment of this application. Figure 8 This is a schematic diagram of the simulation results of a transient voltage support control method using an energy storage converter under transient high voltage conditions, provided in an embodiment of this application.

[0182] Figure 7 Simulation results of a conventional self-synchronizing voltage source control strategy under transient high voltage conditions are presented. It can be seen that under this strategy, when the grid voltage rises to 1.4 pu at t=3s and recovers after 0.5s, the voltage amplitude is relatively high during the fault period, approximately 1.25 pu, while the reactive power is almost zero. After the grid voltage recovers, the energy storage converter experiences significant fluctuations and takes a considerable amount of time to return to steady state.

[0183] Figure 8 Simulation results are presented showing the transient voltage support control method for the energy storage converter proposed in this application under transient high voltage conditions. Fault conditions and Figure 7 While similar to the previous one, it can be seen that it has a significant supporting effect on the grid connection point voltage, compared to... Figure 7The voltage at the grid connection point was approximately 1.25 pu during the fault period. Figure 8 The voltage amplitude remained consistently around 1.14 pu. Furthermore, after fault recovery, the relevant waveforms reached a steady state within a short time, further demonstrating that the proposed method can improve fault ride-through stability.

[0184] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0185] Please see Figure 9 , Figure 9 This is a structural block diagram of a transient voltage support device for an energy storage converter provided in an embodiment of this application. The transient voltage support device for the energy storage converter includes:

[0186] Acquisition unit 100 is used to acquire preset reference value data and output electrical information of the energy storage converter;

[0187] The grid connection point unit 200, in response to the output electrical information, obtains the active power information, reactive power information and voltage amplitude information of the grid connection point;

[0188] The grid-connected control unit 300 is used to obtain grid-connected control data of the energy storage converter in response to one or more of preset reference value data, active power information, reactive power information and voltage amplitude information, and to control the energy storage converter to perform transient voltage support control for grid-connected conversion through the grid-connected control data.

[0189] In some embodiments, the preset reference value data includes reactive power reference value and voltage amplitude reference value, and the grid-connected control data includes internal potential amplitude. The grid-connected control unit 300 is further configured to: obtain the internal potential amplitude of the energy storage converter in response to the reactive power reference value, voltage amplitude reference value, reactive power information and voltage amplitude information.

[0190] In some embodiments, the preset reference value data also includes an active power reference value, and the grid-connected control unit 300 is further configured to: obtain an active power limit value in response to the active power reference value.

[0191] In some embodiments, the grid-connected control data includes frequency information and phase angle information, and the grid-connected control unit 300 is further configured to: obtain the frequency information and phase angle information of the energy storage converter in response to the active power limit value and active power information.

[0192] In some embodiments, the grid-connected control unit 300 is further configured to: respond to the droop control output signal, the transient droop control output signal, the active power limit value, and the active power information and perform rotor simulation to obtain the frequency information of the energy storage converter; and respond to the frequency information to obtain the droop control output signal, the transient droop control output signal, and the phase angle information of the energy storage converter.

[0193] In some embodiments, the acquisition unit 100 is further configured to: acquire current limit information of the energy storage converter; and determine active power limit based on voltage amplitude information, current limit information and reactive power information, wherein the active power limit includes an upper limit and a lower limit.

[0194] In some embodiments, the grid-connected control unit 300 is further configured to: obtain a reactive power droop output signal in response to a reactive power reference value and reactive power information; obtain a voltage droop output signal in response to a voltage amplitude reference value and voltage amplitude information; and obtain the internal potential amplitude of the energy storage converter in response to the reactive power droop output signal and the voltage droop output signal.

[0195] In some embodiments, the grid-connected control data includes one or more of internal potential amplitude, frequency information, and phase angle information. The grid-connected control unit 300 is further configured to: in response to one or more of the internal potential amplitude, frequency information, and phase angle information, limit the current amplitude output by the energy storage converter through inner loop control.

[0196] In some embodiments, the output electrical information of the energy storage converter includes output voltage information and output current information. The grid-connected control unit 300 is further configured to: obtain a current command value in response to the output voltage information, phase information and internal potential amplitude; and obtain a current reference value by limiting the current command value.

[0197] In some embodiments, the grid-connected control unit 300 is further configured to: perform closed-loop control of the output current information based on the current reference value.

[0198] It should be noted that the transient voltage support device for the energy storage converter provided in this application embodiment is related to... Figures 1 to 8 The method embodiments shown correspond to each other, and will not be described again here to avoid repetition.

[0199] This application also provides a control device for an energy storage converter; please refer to [link to relevant documentation]. Figure 10 , Figure 10This is a structural block diagram of a control device for an energy storage converter provided in an embodiment of this application. The control device may include a processor 510, a communication interface 520, a memory 530, and at least one communication bus 540. The communication bus 540 is used to enable direct communication between these components. In this embodiment, the communication interface 520 of the control device is used for signaling or data communication with other node devices. The processor 510 may be an integrated circuit chip with signal processing capabilities.

[0200] The processor 510 described above can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor, or the processor 510 can be any conventional processor.

[0201] The memory 530 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc. The memory 530 stores computer-readable instructions, and when these computer-readable instructions are executed by the processor 510, the control device can perform the aforementioned operations. Figures 1 to 8 The various steps involved in the method implementation examples.

[0202] Optionally, the control device may also include a storage controller and an input / output unit.

[0203] The memory 530, storage controller, processor 510, peripheral interface, and input / output unit are electrically connected directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses 540. The processor 510 is used to execute executable modules stored in the memory 530, such as software function modules or computer programs included in the control device.

[0204] The input / output unit is used to provide users with the ability to create tasks and to set optional start periods or preset execution times for those tasks, thereby enabling user-server interaction. The input / output unit may be, but is not limited to, a mouse and keyboard.

[0205] Understandable. Figure 10 The structure shown is for illustrative purposes only; the control device may also include components such as... Figure 10 The more or fewer components shown, or having the same Figure 10 The different configurations shown. Figure 10 The components shown can be implemented using hardware, software, or a combination thereof.

[0206] This application also provides a storage medium storing instructions. When the instructions are run on a computer, the computer program is executed by a processor to implement the method described in the method embodiment. To avoid repetition, the method will not be described again here.

[0207] This application also provides a computer program product that, when run on a computer, causes the computer to perform the method described in the method embodiment.

[0208] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0209] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0210] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0211] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0212] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0213] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method of transient voltage support for an energy storage converter, characterized by, The method comprises: acquiring preset reference value data and output electrical information of an energy storage converter; in response to the output electrical information, obtaining active power information, reactive power information and voltage amplitude information of a grid-connected point; in response to one or more of the preset reference value data, the active power information, the reactive power information and the voltage amplitude information, obtaining grid-connected regulation data of the energy storage converter, and controlling transient voltage support regulation of grid-connected conversion of the energy storage converter through the grid-connected regulation data; the preset reference value data comprises reactive power reference value and voltage amplitude reference value, and the grid-connected regulation data comprises internal potential amplitude, and in response to one or more of the preset reference value data, the active power information, the reactive power information and the voltage amplitude information, obtaining grid-connected regulation data of the energy storage converter comprises: in response to the reactive power reference value, the voltage amplitude reference value, the reactive power information and the voltage amplitude information, obtaining internal potential amplitude of the energy storage converter.

2. The method of transient voltage support for an energy storage inverter of claim 1, wherein, The preset reference value data further comprises active power reference value, and the method further comprises: in response to the active power reference value, obtaining active power amplitude limiting value.

3. The method of transient voltage support for energy storage inverters of claim 2, wherein, The grid-connected regulation data comprises frequency information and phase angle information, and in response to one or more of the preset reference value data, the active power information, the reactive power information and the voltage amplitude information, obtaining grid-connected regulation data of the energy storage converter comprises: in response to the active power amplitude limiting value and the active power information, obtaining frequency information and phase angle information of the energy storage converter.

4. The method of transient voltage support for energy storage inverters of claim 3, wherein, In response to the active power amplitude limiting value and the active power information, obtaining frequency information and phase angle information of the energy storage converter comprises: in response to droop control output signal, transient droop control output signal, the active power amplitude limiting value and the active power information and performing rotor simulation, obtaining frequency information of the energy storage converter; in response to the frequency information, obtaining the droop control output signal, the transient droop control output signal and phase angle information of the energy storage converter.

5. The method of claim 2, wherein, The method further comprises: acquiring current amplitude limiting value information of the energy storage converter; determining the active power amplitude limiting value according to the voltage amplitude information, the current amplitude limiting value information and the reactive power information, wherein the active power amplitude limiting value comprises amplitude upper limit and amplitude lower limit.

6. The method of transient voltage support for energy storage inverters of claim 1, wherein, In response to the reactive power reference value, the voltage amplitude reference value, the reactive power information and the voltage amplitude information, obtaining internal potential amplitude of the energy storage converter comprises: in response to the reactive power reference value and the reactive power information, obtaining reactive droop output signal; in response to the voltage amplitude reference value and the voltage amplitude information, obtaining voltage droop output signal; in response to the reactive droop output signal and the voltage droop output signal, obtaining internal potential amplitude of the energy storage converter.

7. The method of transient voltage support for energy storage inverters of claim 1, wherein, The grid-connected regulation data comprises one or more of internal potential amplitude, frequency information and phase angle information, and the method further comprises: In response to one or more of the internal potential amplitude, the frequency information, and the phase angle information, limit, by inner loop control, an amplitude of a current output by the energy storage converter.

8. The method of transient voltage support for an energy storage inverter of claim 7, wherein, The output electrical information of the energy storage converter includes output voltage information and output current information, and the method further includes: In response to the output voltage information, phase information, and the internal potential amplitude, obtain a current command value; Limit, according to the current command value, to obtain a current reference value.

9. The method of transient voltage support for an energy storage inverter of claim 8, wherein, The method further includes: Close loop control, based on the current reference value, on the output current information.

10. A transient voltage support device for an energy storage inverter, characterized by, Comprise: An acquisition unit is configured to acquire preset reference value data and output electrical information of an energy storage converter; A point-of-connection unit is configured to, in response to the output electrical information, obtain active power information, reactive power information, and voltage amplitude information of a point of connection; A point-of-connection regulation unit is configured to, in response to one or more of the preset reference value data, the active power information, the reactive power information, and the voltage amplitude information, obtain point-of-connection regulation data of the energy storage converter, and control transient voltage support regulation of the energy storage converter in a transient state of grid connection conversion by the point-of-connection regulation data. The preset reference value data includes a reactive power reference value and a voltage amplitude reference value, and the point-of-connection regulation data includes an internal potential amplitude, and the point-of-connection regulation unit is specifically configured to, in response to the reactive power reference value, the voltage amplitude reference value, the reactive power information, and the voltage amplitude information, obtain the internal potential amplitude of the energy storage converter.

11. A control device for an energy storage inverter, characterized by Comprise: A memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements steps of the transient voltage support method of the energy storage converter according to any one of claims 1 to 9 when executing the computer program.

12. A computer readable storage medium, characterized in that, The computer readable storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the transient voltage support method of the energy storage converter according to any one of claims 1 to 9.

Images