Dynamic voltage support method and apparatus of energy storage converter, device and storage medium

Abstract

The application provides a dynamic voltage support method and apparatus of an energy storage converter, a device and a storage medium, relating to the technical field of grid-connected transformation. The dynamic voltage support method of the energy storage converter comprises: obtaining preset reference value data and output electric information of the energy storage converter; in response to the output electric 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 and control data of the energy storage converter, and by means of the grid-connected regulation and control data, controlling the energy storage converter to carry out dynamic voltage support regulation dynamic voltage of grid-connected transformation. The method can improve the dynamic voltage support capability of the energy storage converter, and improve the stability of grid-connected regulation and control.

Description

A transient voltage support method, device, equipment and storage medium for energy storage converter

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application entitled “A transient voltage support method, device, equipment and storage medium for an energy storage converter” (application number: 2023112791084) filed on September 28, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of grid-connected conversion technology, and in particular to a transient voltage support method, device, equipment and storage medium for an energy storage converter. Background Art

[0004] With the continuous development of new energy generation technologies, the application of distributed generation and microgrid technologies is becoming increasingly widespread. In new power systems employing distributed generation or microgrid technologies, energy storage technologies can improve power supply reliability and flexibility, playing a crucial role in these systems. Energy storage converters serve as the grid-connected interface for energy storage equipment, including electrochemical energy storage devices.

[0005] Generally, energy storage converters controlled by vector control methods can adjust the magnitude and angle of their output voltage or frequency. However, vector control methods rely on the grid to generate frequency and internal electrical heating. Energy storage converters controlled by self-synchronous voltage sources, on the other hand, can independently generate frequency and internal power. However, when the grid experiences transient low or transient overvoltage due to short circuits, DC blocking, or other factors, the energy storage converter can easily experience a number of problems, including but not limited to overcurrent, excessively low or excessive grid connection voltage, power angle swing, and instability. These problems not only pose a threat to equipment safety but also adversely affect transient processes in the grid.

[0006] Summary of the Invention

[0007] The purpose of this application is to provide a transient voltage support method, device, equipment and storage medium for an energy storage converter, which can improve the transient voltage support capability of the energy storage converter and improve the stability of grid-connected regulation.

[0008] In a first aspect, the present application provides a transient voltage support method for an energy storage converter, comprising:

[0009] Obtaining preset reference value data and output electrical information of the energy storage converter;

[0010] In response to the output power information, obtaining active power information, reactive power information and voltage amplitude information of the grid connection point;

[0011] 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 by the grid-connected control data.

[0012] In the above implementation process, the transient voltage support method of the energy storage converter obtains the 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. Through the grid-connected control data, measures such as limiting the reference value of active power, applying damping to the active frequency control loop, dynamically modifying the reactive voltage droop coefficient, and actively limiting the output current of the converter are adopted. This not only enables the energy storage converter to adaptively output the reactive power to support the voltage amplitude of the grid connection point, but also prevents the power angle acceleration process from occurring 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 the grid-connected control.

[0013] Furthermore, the preset reference value data includes a reactive power reference value and a voltage amplitude reference value, and the grid-connected control data includes an 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, obtaining the grid-connected control data of the energy storage converter includes:

[0014] In response to the reactive power reference value, the voltage amplitude reference value, the reactive power information, and the voltage amplitude information, an internal potential amplitude of the energy storage converter is obtained.

[0015] In the above implementation process, the reactive power reference value, the voltage amplitude reference value, the reactive power information and the voltage amplitude information are used to calculate and obtain the internal potential amplitude of the energy storage converter, so that the internal potential amplitude of the energy storage converter participates in the grid-connected conversion process of the energy storage converter and controls the on and off switching signals of the power electronic switches in the energy storage converter to improve the stability of the grid-connected regulation.

[0016] Furthermore, the preset reference value data further includes an active power reference value, and the method further includes:

[0017] In response to the active power reference value, an active power limit value is obtained.

[0018] In the above implementation process, 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.

[0019] Furthermore, the grid-connected control data includes 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 the grid-connected control data of the energy storage converter includes:

[0020] In response to the active power limit value and the active power information, frequency information and phase angle information of the energy storage converter are obtained.

[0021] In the above implementation process, the active power limit value and the active power information are used to calculate and obtain the frequency information and phase angle information of the energy storage converter, so as to participate in the grid-connected conversion process of the energy storage converter through the frequency information and phase angle information of the energy storage converter, and control the switching signals of the on and off of the power electronic switches in the energy storage converter to improve the stability of the grid-connected regulation.

[0022] Furthermore, in response to the active power limit value and the active power information, obtaining the frequency information and phase angle information of the energy storage converter includes:

[0023] 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 to obtain frequency information of the energy storage converter;

[0024] In response to the frequency information, the droop control output signal, the transient droop control output signal, and phase angle information of the energy storage converter are obtained.

[0025] Furthermore, the method further comprises:

[0026] Acquiring current limit value information of the energy storage converter;

[0027] The active power amplitude limit value is determined according to the voltage amplitude information, the current amplitude limit value information and the reactive power information, wherein the active power amplitude limit value includes an upper amplitude limit limit and a lower amplitude limit limit.

[0028] In the above implementation process, the active power limit value is calculated and obtained through the voltage amplitude information, current limit value information and reactive power information, so as to avoid the active power reference value exceeding the threshold value and further improve the stability of grid-connected regulation.

[0029] Furthermore, in response to the reactive power reference value, the voltage amplitude reference value, the reactive power information, and the voltage amplitude information, obtaining the internal potential amplitude of the energy storage converter includes:

[0030] obtaining a reactive power droop output signal in response to the reactive power reference value and the reactive power information;

[0031] obtaining a voltage droop output signal in response to the voltage amplitude reference value and the voltage amplitude information;

[0032] In response to the reactive power droop output signal and the voltage droop output signal, an internal potential amplitude of the energy storage converter is obtained.

[0033] 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, so that the internal potential amplitude of the energy storage converter participates in the grid-connected conversion process of the energy storage converter and controls the on and off switching signals of the power electronic switches in the energy storage converter to improve the stability of the grid-connected regulation.

[0034] Furthermore, the grid-connected control data includes one or more of internal potential amplitude, frequency information, and phase angle information, and the method further includes:

[0035] 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.

[0036] 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.

[0037] Furthermore, the output electrical information of the energy storage converter includes output voltage information and output current information, and the method further includes:

[0038] obtaining a current command value in response to the output voltage information, the phase information, and the internal potential amplitude;

[0039] Limitation is performed according to the current command value to obtain a current reference value.

[0040] Furthermore, the method further comprises:

[0041] Closed-loop control is performed on the output current information based on the current reference value.

[0042] In a second aspect, the present application provides a transient voltage support device for an energy storage converter, comprising:

[0043] An acquisition unit, used to acquire preset reference value data and output electrical information of the energy storage converter;

[0044] A grid connection point unit, in response to the output power information, obtains active power information, reactive power information and voltage amplitude information of the grid connection point;

[0045] A grid-connected control unit is used to obtain grid-connected control data of the energy storage converter 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, and control the transient voltage support control of the energy storage converter for grid-connected conversion through the grid-connected control data.

[0046] Furthermore, the preset reference value data includes a reactive power reference value and a voltage amplitude reference value, the grid-connected control data includes an 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.

[0047] 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.

[0048] Furthermore, the grid-connected control data includes frequency information and phase angle information, and the grid-connected control unit is further configured to obtain frequency information and phase angle information of the energy storage converter in response to the active power limit value and the active power information.

[0049] 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; 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.

[0050] Furthermore, the acquisition unit is also used to: obtain the current limit value information of the energy storage converter; determine the active power limit value based on the voltage amplitude information, the current limit value information and the reactive power information, wherein the active power limit value includes an upper limit and a lower limit.

[0051] Furthermore, the grid-connected control unit is also used 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.

[0052] Furthermore, the grid-connected control data includes one or more of the internal potential amplitude, frequency information and phase angle information, and the grid-connected control unit is also used to: limit the current amplitude output by the energy storage converter through inner-loop control in response to one or more of the internal potential amplitude, the frequency information and the phase angle information.

[0053] Furthermore, the output electrical information of the energy storage converter includes output voltage information and output current information, and 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 perform limitation according to the current command value to obtain a current reference value.

[0054] Furthermore, the grid-connected control unit is further configured to perform closed-loop control on the output current information based on the current reference value.

[0055] In a third aspect, the present 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 implements the steps of the method described in any one of the first aspects when executing the computer program.

[0056] In a fourth aspect, the present application provides a computer-readable storage medium having instructions stored thereon. When the instructions are executed on a computer, the computer executes the method as described in any one of the first aspects.

[0057] In a fifth aspect, the present application provides a computer program product, which, when running on a computer, enables the computer to execute the method as described in any one of the first aspects.

[0058] Other features and advantages disclosed in the present application will be described in the following description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by implementing the above-mentioned technology disclosed in the present application.

[0059] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0061] FIG1 is a schematic flow chart of a transient voltage support method for an energy storage converter provided in an embodiment of the present application;

[0062] FIG2 is a flowchart of an implementation of a transient voltage support method for an energy storage converter provided in an embodiment of the present application;

[0063] FIG3 is a flowchart of a second implementation of a transient voltage support method for an energy storage converter provided in an embodiment of the present application;

[0064] FIG4 is a schematic diagram of a network topology for grid-connected control of a self-synchronous voltage source based on an energy storage converter according to an embodiment of the present application;

[0065] FIG5 is a schematic diagram of simulation results of a conventional self-synchronous voltage source control strategy under a low voltage fault provided by an embodiment of the present application;

[0066] 6 is a schematic diagram of simulation results of a method for controlling transient voltage support using an energy storage converter under low voltage fault conditions provided by an embodiment of the present application;

[0067] FIG7 is a schematic diagram of simulation results of a self-synchronous voltage source control strategy under transient high voltage conditions provided by an embodiment of the present application;

[0068] FIG8 is a schematic diagram of simulation results of a transient voltage support control method using an energy storage converter under transient high voltage conditions provided by an embodiment of the present application;

[0069] FIG9 is a structural block diagram of a transient voltage support device of an energy storage converter provided in an embodiment of the present application;

[0070] FIG10 is a structural block diagram of a control device for an energy storage converter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0071] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0072] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0073] The energy storage converter can include one or more grid-connected interfaces, through which electrochemical energy storage equipment, new energy power generation equipment and other equipment can be connected to the power grid. The energy storage converter controlled by the self-synchronous voltage source can independently construct the frequency and internal potential, while the traditional vector control method needs to rely on the power grid to generate it. Therefore, the self-synchronous voltage source plays an important role in improving the problems of voltage over-limit, reactive power deficiency, wide-band oscillation, synchronous instability and other problems caused by characteristics such as "low inertia" and "low short-circuit ratio" in areas with high penetration of new energy.

[0074] However, when using a self-synchronous voltage source to control an energy storage converter, its ability to output reactive power is limited by its current tolerance. During periods of low or overvoltage in the grid, its ability to transiently support the voltage amplitude at the connection point is limited. Within the limited current output range, effectively supporting the voltage amplitude at the connection point while preventing the energy storage converter from experiencing power angle swing or instability is currently a difficult technology to achieve.

[0075] In order to solve the above problems, an embodiment of the present application proposes a transient voltage support method for an energy storage converter. The executor of the method can be a control device of the energy storage converter or an electric energy storage system. The transient voltage support method for the energy storage converter obtains the 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. The grid-connected control data is used to limit the reference value of the active power, apply damping to the active frequency control loop, dynamically modify the reactive voltage droop coefficient, actively limit the output current of the converter, and other measures. Not only can the energy storage converter adaptively output the reactive power to support the voltage amplitude of the grid connection point, but it can also prevent the power angle acceleration process from occurring 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 the grid-connected control.

[0076] Please refer to FIG1 , which is a flow chart of a transient voltage support method for an energy storage converter provided in an embodiment of the present application. The transient voltage support method for the energy storage converter includes the following steps:

[0077] S100: Acquire preset reference value data and output electrical information of the energy storage converter;

[0078] S200: In response to the output power information, obtaining active power information, reactive power information and voltage amplitude information of the grid connection point;

[0079] S300: In response 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, and transient voltage support control of the energy storage converter for grid-connected conversion is controlled by the grid-connected control data.

[0080] Exemplarily, the preset reference value data in the embodiment of the present application may include an active power reference value, a reactive power reference value, a voltage amplitude reference value, etc.; thus, based on the active power reference value, the reactive power reference value, and the voltage amplitude reference value, the corresponding electrical parameters are limited or otherwise operated;

[0081] Among them, the output electrical information of the energy storage converter includes the output current information of the energy storage converter at the grid-connected point, and the output voltage information, etc.; the transient voltage support method of the energy storage converter is based on the preset reference value data and the output electrical information of the energy storage converter to obtain the grid-connected control data of the energy storage converter. Through the grid-connected control data, the reference value of the active power can be limited, damping can be applied to the active frequency control loop, the reactive voltage droop coefficient can be dynamically modified, and the output current of the converter can be actively limited. This not only enables the energy storage converter to adaptively output the reactive power to support the voltage amplitude of the grid-connected point, but also prevents the power angle acceleration process from occurring 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 the grid-connected control.

[0082] Please refer to Figures 2 and 3. Figure 2 is a flowchart of one implementation flow of a transient voltage support method for an energy storage converter provided in an embodiment of the present application. Figure 3 is a flowchart of another implementation flow of a transient voltage support method for an energy storage converter provided in an embodiment of the present application. The transient voltage support method for an energy storage converter is applied to the following three modules (a first module, a second module, and a third module):

[0083] The first module: 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 of the grid connection point s Calculate the limit value of the active power reference value. The calculation formula is:

[0084] Where: P max is the upper limit of the active power reference value, P min is the lower limit of the active power reference value, U s is the voltage amplitude information of the grid connection point, I lim is the current limit value information of the energy storage converter, Q s The reactive power information of the grid connection point;

[0085] The second module includes the following submodules: 1) rotor simulation submodule; 2) droop control submodule; 3) transient droop control submodule; 4) phase angle generation submodule; Optionally, the transfer function of each submodule of the second module is:

[0086] The rotor simulation submodule:

[0087] The droop control submodule: P d1 =D·ω;

[0088] The transient droop control submodule:

[0089] The phase angle generation submodule:

[0090] Where, P ref is the active power reference value, P s is the active power information of the grid connection point, P d1 is the output of the droop control submodule, P d2 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, transient droop control submodule, and 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 are preset parameters.

[0091] Optionally, the droop control submodule in the second module is used to characterize the active frequency droop coefficient of the energy storage converter, namely the Pf droop coefficient used for primary frequency modulation; it also represents the damping of power angle swing. The transient droop control submodule is used to increase the damping of power angle swing while maintaining the Pf droop coefficient unchanged.

[0092] In some possible implementations, the parameters H, D, T d ,D dyn ,ω n The values ​​are: H=5,D=25,T d =10,T dyn =40,ω n =100π.

[0093] Where H: represents the inertia time constant, which is usually set to 3s to 10s;

[0094] D: represents the Pf droop coefficient, usually set to 20~50;

[0095] T d : represents the transient droop time constant, usually set to 2s~10s;

[0096] D dyn : represents the transient droop coefficient, and the recommended setting is 40 to 100;

[0097] ω n : represents the rated angular frequency of the power grid, its value is 100π=314.1593rad / s;

[0098] It should be noted that the above-mentioned specific parameter settings are for reference only and not for specific limitation. The corresponding parameters can be adjusted according to the actual situation. The specific parameter settings below are also for reference only and not for specific limitation. The corresponding parameters can be adjusted according to the actual situation and will not be repeated here.

[0099] The third module includes submodules: 1) reactive power droop submodule; 2) voltage droop submodule; 3) internal potential regulation submodule. The transfer function of each submodule is:

[0100] The reactive power droop submodule: ε q =K q ·(Q ref -Q s );

[0101] The voltage droop submodule: ε v =K v ·(U ref -U s );

[0102] The internal potential regulation submodule:

[0103] Where: Q ref is the reactive power reference value, Q s is the reactive power at the grid connection point, ε q is the output of the reactive droop submodule, U ref is the voltage amplitude reference value, U s is the voltage amplitude at the grid connection point, ε v is the output of the voltage droop submodule, ε q and ε v At the same time, it is the input of the internal potential regulation submodule, E is the internal potential amplitude, and E is the output of the internal potential regulation submodule. q ,K v ,T v is a parameter, where K q It is called reactive droop coefficient, K v It is called voltage droop coefficient;

[0104] In a possible implementation, maximum and minimum value limiting is performed on the integrator of the internal potential regulation submodule.

[0105] In a possible implementation, the reactive droop coefficient K of the reactive droop submodule and the voltage droop submodule is qand the voltage droop coefficient K v is a function of the grid connection point voltage amplitude.

[0106] In a possible implementation, the grid connection point voltage amplitude function expression is:

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

[0108] In some embodiments, the values ​​of the relevant parameters are as follows: K q0 =1.0,K q1 =0.1,K v0 =0.1,K v1 =1.0; U s1 =0.85,U s2 =0.90,U s3 =1.10,U s4 =1.15;

[0109] In a possible embodiment, the present application is for K q(v) The calculation of is as follows:

[0110] K q0 and K u0 Generally, the design is based on the reactive voltage control target of the virtual synchronous machine under normal conditions. For example, if the reactive voltage control target is constant reactive power, then K can be set. q0 =1,K u0 =0; if the control target is constant voltage, then you can set K q0 =0,K u0 =1; if the reactive voltage needs to meet a certain droop coefficient K qu , then you can set K q0 :K u0 =K qu ;

[0111] In order to obtain better transient voltage support effect, K q1 and K u1 Should meet: K​​​q1 :K u1 =0~0.1;

[0112] 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 is considered overvoltage);

[0113] Optionally, U s2 and U s3 The purpose of taking 0.85 and 1.15 respectively is to make the reactive voltage droop coefficient in Figure 2 change continuously, so as to reduce the occurrence of oscillation. These two values ​​are recommended values;

[0114] It should be noted that in actual applications, it is recommended to adopt these recommended values, otherwise it will affect the results; of course, according to actual needs, the above recommended values ​​can be adjusted accordingly, which will not be repeated here.

[0115] In some embodiments, the preset reference value data includes a reactive power reference value and a voltage amplitude reference value, and the grid-connected control data includes an 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, obtaining grid-connected control data of the energy storage converter includes:

[0116] In response to the reactive power reference value, the voltage amplitude reference value, the reactive power information, and the voltage amplitude information, an internal potential amplitude of the energy storage converter is obtained.

[0117] Exemplarily, the reactive power reference value, voltage amplitude reference value, reactive power information and voltage amplitude information are used to calculate and obtain the internal potential amplitude of the energy storage converter, so that the internal potential amplitude of the energy storage converter participates in the grid-connected conversion process of the energy storage converter, and controls the on and off switching signals of the power electronic switches in the energy storage converter to improve the stability of the grid-connected regulation.

[0118] In some embodiments, the preset reference value data further includes an active power reference value, and the transient voltage support method of the energy storage converter further includes:

[0119] In response to the active power reference value, an active power limit value is obtained.

[0120] Exemplarily, the active power limit value is used to limit the active power reference value of the energy storage converter to prevent the active power reference value from exceeding a threshold value, thereby further improving the stability of grid-connected regulation.

[0121] In some embodiments, the grid-connected control data includes frequency information and phase angle information. In response to one or more of preset reference value data, active power information, reactive power information, and voltage amplitude information, obtaining the grid-connected control data of the energy storage converter includes:

[0122] In response to the active power limit value and the active power information, frequency information and phase angle information of the energy storage converter are obtained.

[0123] Exemplarily, the frequency information and phase angle information of the energy storage converter are calculated and obtained through the active power limit value and the active power information, so that the frequency information and phase angle information of the energy storage converter participate in the grid-connected conversion process of the energy storage converter, and control the switching signals of the on and off of the power electronic switches in the energy storage converter to improve the stability of the grid-connected regulation.

[0124] In some embodiments, in response to the active power limit value and the active power information, obtaining the frequency information and the phase angle information of the energy storage converter includes:

[0125] 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 to obtain frequency information of the energy storage converter;

[0126] In response to the frequency information, a droop control output signal, a transient droop control output signal, and phase angle information of the energy storage converter are obtained.

[0127] For example, in combination with the second module shown in FIG2 , P d1 is 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 information and phase angle information of the energy storage converter based on the above method.

[0128] In some embodiments, the transient voltage support method of the energy storage converter further includes:

[0129] Obtaining current limit value information of the energy storage converter;

[0130] The active power amplitude limit value is determined according to the voltage amplitude information, the current amplitude limit value information and the reactive power information, wherein the active power amplitude limit value includes an upper amplitude limit limit and a lower amplitude limit limit.

[0131] Exemplarily, the active power limit value is calculated and obtained through the voltage amplitude information, the current limit value information and the reactive power information, so as to prevent the active power reference value from exceeding the threshold value, thereby further improving the stability of the grid-connected regulation.

[0132] In some embodiments, in response to the reactive power reference value, the voltage amplitude reference value, the reactive power information, and the voltage amplitude information, obtaining the internal potential amplitude of the energy storage converter includes:

[0133] obtaining a reactive power droop output signal in response to a reactive power reference value and reactive power information;

[0134] obtaining a voltage droop output signal in response to a voltage amplitude reference value and the voltage amplitude information;

[0135] In response to the reactive power droop output signal and the voltage droop output signal, an internal potential amplitude of the energy storage converter is obtained.

[0136] For example, in combination with the third module shown in FIG3 , ε q is the output of the reactive droop submodule (reactive droop output signal), ε v The output of the voltage droop submodule (voltage droop output signal) is used to calculate and obtain the internal potential amplitude through the reactive power droop output signal and the voltage droop output signal, thereby participating in the grid-connected conversion process of the energy storage converter through the internal potential amplitude of the energy storage converter, and controlling the on-off switching signal of the power electronic switch in the energy storage converter to improve the stability of the grid-connected regulation.

[0137] Please refer to Figure 4, which is a schematic diagram of the network topology of a grid-connected control system for a self-synchronous voltage source based on an energy storage converter provided in an embodiment of the present application. As shown in Figure 4, the grid-connected control system of the self-synchronous 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 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:

[0138] Signal acquisition and processing module M1 is used to detect the current i s and voltage u s , through 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 of 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 ;

[0139] Active power reference value limiting module M2, according to the voltage amplitude information U of the grid point s , current limit value I lim , Reactive power information Q of the grid connection point s Calculate the limit value of the active power reference value;

[0140] The power synchronization control module M3 is used to convert the active power reference value P generated by the instruction generation unit into s0 and the active power P at the grid connection point s The deviation of is used to generate the reference angular frequency ω (frequency information) of the energy storage converter through the control loop, and further generates the reference angle θ (phase angle information) of the energy storage converter by integrating the reference angular frequency;

[0141] The reactive voltage control module M4 is used to convert 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 collected by the signal acquisition and processing module M4 s Deviation) and reactive power deviation (the grid-connected point reactive power reference value Q generated by the instruction generation unit s0 The reactive power Q of the grid connection point collected by the signal acquisition and processing module M4 s The weighted sum of the deviation of the reactive power and voltage control parameters K is used as the error signal. v Regulation control to generate a reference value E of the internal potential amplitude;

[0142] The calculation formula for generating the reference value E of the internal potential amplitude can be expressed as:

[0143] Where E is the internal potential amplitude, T v K is the time constant of the integral control, which is used to indicate the integration speed of the integrator. The larger the time constant, the slower the integral control. q and K v They are the reactive power droop coefficient and the voltage droop coefficient, which can be adjusted according to the reactive power and voltage control requirements;

[0144] According to the reference angle θ generated by the power synchronization control module M3 and the internal potential amplitude reference value E generated by the module M4, the reference voltage u of the energy storage converter is generated through the virtual admittance control M5, the current limit control M6, the current inner loop control M7 and the anti-Peak transformation. ref , so that the control targets of the power synchronization control module M3 and the reactive voltage control module M4, namely, the control targets of reducing the active power deviation, reactive power deviation and grid connection point voltage deviation, are achieved simultaneously;

[0145] The modulation and driving module M8 is used to generate the reference voltage U according to the reference voltage generating module M3. ref Generates a drive signal to control the on / off switching signal of the power electronic switch in the energy storage converter, controls and regulates the SOC of the energy storage device, and makes the voltage output by the energy storage device pass through the impedance X of the filter inductor of the energy storage converter. f , the impedance of the grid connection point and the inductive grid X g Then, it is connected to the grid.

[0146] In a possible implementation, the signal acquisition and processing module M1 calculates the grid-connected point active power P according to the output current of the energy storage converter and the grid-connected point voltage: s , grid-connected point reactive power Q s and the grid 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; according to the active and active reference values, the frequency and phase angle of the energy storage converter are generated by the power synchronization control module M3; according to the reactive power, reactive reference value, the voltage amplitude, and voltage amplitude reference value, the internal potential amplitude of the energy storage converter is generated by the reactive voltage control module M4;

[0147] In a possible implementation, the upper and lower limits of the active power limit value in the active power reference limit module M2 are determined by the following formula:

[0148] Where: P max is the upper limit of the active power reference value, P min is the lower limit of the active power reference value, U s is the voltage amplitude of the grid connection point, I lim is the current limit value of the energy storage converter, Q s is the reactive power of the grid connection point;

[0149] In a possible implementation, the power synchronization control module M3 includes the following submodules: 1) rotor simulation submodule; 2) droop control submodule; 3) transient droop control submodule; 4) phase angle generation submodule. The transfer function of each submodule is:

[0150] The rotor simulation submodule:

[0151] The droop control submodule: P d1 =D·ω;

[0152] The transient droop control submodule:

[0153] The phase angle generation submodule:

[0154] Where: P ref is the active power reference value, P s is the active power of the grid connection point, P d1 is the output of the droop control submodule, P d2is 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, transient droop control submodule, and 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 As a parameter.

[0155] In one possible implementation, the reactive voltage control module M4 includes the following submodules: 1) reactive droop submodule; 2) voltage droop submodule; 3) internal potential regulation submodule. The transfer function of each submodule is:

[0156] The reactive power droop submodule: ε q =K q ·(Q ref -Q s );

[0157] The voltage droop submodule: ε v =K v ·(U ref -U s );

[0158] The internal potential regulation submodule:

[0159] Where: Q ref is the reactive power reference value, Q s is the reactive power at the grid connection point, ε q is the output of the reactive droop submodule, U ref is the voltage amplitude reference value, U s is the voltage amplitude at the grid connection point, ε v is the output of the voltage droop submodule, ε q and ε v At the same time, it is the input of the internal potential regulation submodule, E is the internal potential amplitude, and E is the output of the internal potential regulation submodule. q ,K v ,T v is a parameter, where K q It is called reactive droop coefficient, K v It is called voltage droop coefficient;

[0160] In a possible implementation, the reactive droop coefficient K of the reactive droop submodule and the voltage droop submodule is q and the voltage droop coefficient K v is a function of the grid connection point voltage amplitude.

[0161] In a possible implementation, the energy storage converter control method limits the current amplitude output by the energy storage converter through an inner loop control module.

[0162] Optionally, the inner loop control module includes the following steps:

[0163] Virtual admittance control module M5: generates a current command value through module M5 according to the grid connection point voltage, the phase information (θ), and the internal potential amplitude;

[0164] Current limiting module M6: according to the current command value, the current command value is limited by module M6 and a current reference value is output;

[0165] Current inner loop control module M7: Based on the current reference value and the current, the current size is closed-loop controlled through the module M7.

[0166] 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:

[0167] 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.

[0168] Exemplarily, 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.

[0169] 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:

[0170] obtaining a current command value in response to the output voltage information, the phase information (θ), and the internal potential amplitude;

[0171] The current reference value is obtained by limiting the current command value.

[0172] In some embodiments, the transient voltage support method of the energy storage converter further includes:

[0173] The output current information is closed-loop controlled based on the current reference value.

[0174] In order to verify the superiority of the transient voltage support method of the energy storage converter in the embodiment of the present application, the self-synchronous voltage source controlled transient voltage support method proposed in the present application was simulated and verified in simulation software.

[0175] Please refer to Figures 5 and 6. Figure 5 is a schematic diagram of simulation results of a conventional self-synchronous voltage source control strategy under a low voltage fault provided by an embodiment of the present application. Figure 6 is a schematic diagram of simulation results of a transient voltage support control method using an energy storage converter under a low voltage fault provided by an embodiment of the present application.

[0176] Figure 6 shows the simulation results of the transient voltage support control method for the energy storage converter proposed in this application under a low-voltage fault. The fault conditions in Figure 6 are the same as those in Figure 5, but it can be seen that it has a significant support effect on the grid connection point voltage. Compared with the grid connection point voltage in Figure 5, which is lower than 0.3pu and shows a continuous downward trend, the voltage amplitude in Figure 6 remains at around 0.65pu. In addition, after the fault is recovered, there is no oscillation as shown in Figure 5, indicating that the proposed method can improve the stability of fault ride-through.

[0177] Please refer to Figures 7 and 8. Figure 7 is a schematic diagram of simulation results of a self-synchronous voltage source control strategy under transient high voltage conditions provided by an embodiment of the present application. Figure 8 is a schematic diagram of simulation results of a transient voltage support control method using an energy storage converter under transient high voltage conditions provided by an embodiment of the present application.

[0178] Figure 7 shows the simulation results using a conventional self-synchronous voltage source control strategy under transient high voltage conditions. As can be seen, under the conventional self-synchronous voltage source control strategy, when the grid voltage rises to 1.4 pu at t = 3 seconds and recovers 0.5 seconds later, the voltage amplitude is 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 swings and takes a long time to return to steady state.

[0179] Figure 8 shows the simulation results of the proposed method for controlling transient voltage support for an energy storage converter under transient high voltage conditions. The fault conditions are the same as those in Figure 7, but it can be seen that the proposed method significantly supports the grid-connected voltage. While the grid-connected voltage in Figure 7 is approximately 1.25 pu during the fault, the voltage amplitude in Figure 8 remains around 1.14 pu. Furthermore, after the fault is recovered, the relevant waveforms are able to enter a steady state in a relatively short period of time, demonstrating that the proposed method can improve the stability of fault ride-through.

[0180] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean 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.

[0181] Please refer to FIG9 , which is a structural block diagram of a transient voltage support device for an energy storage converter provided in an embodiment of the present application. The transient voltage support device for the energy storage converter includes:

[0182] An acquisition unit 100 is used to acquire preset reference value data and output electrical information of the energy storage converter;

[0183] The grid connection point unit 200 obtains active power information, reactive power information and voltage amplitude information of the grid connection point in response to the output power information;

[0184] 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 control the transient voltage support control of the energy storage converter for grid-connected conversion through the grid-connected control data.

[0185] In some embodiments, the preset reference value data includes a reactive power reference value and a voltage amplitude reference value, and the grid-connected control data includes an internal potential amplitude. The grid-connected control unit 300 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.

[0186] In some embodiments, the preset reference value data further 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.

[0187] 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 frequency information and phase angle information of the energy storage converter in response to the active power limit value and the active power information.

[0188] In some embodiments, the grid-connected control unit 300 is further used to: obtain frequency information of the energy storage converter 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 perform rotor simulation; obtain the droop control output signal, the transient droop control output signal and the phase angle information of the energy storage converter in response to the frequency information.

[0189] In some embodiments, the acquisition unit 100 is further used to: obtain current limit value information of the energy storage converter; determine the active power limit value based on the voltage amplitude information, current limit value information and reactive power information, wherein the active power limit value includes an upper limit and a lower limit.

[0190] In some embodiments, the grid-connected control unit 300 is also used 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.

[0191] In some embodiments, the grid-connected control data includes one or more of the internal potential amplitude, frequency information, and phase angle information. The grid-connected control unit 300 is also used to: limit the current amplitude output by the energy storage converter through inner-loop control in response to one or more of the internal potential amplitude, frequency information, and phase angle information.

[0192] In some embodiments, the output electrical information of the energy storage converter includes output voltage information and output current information, and the grid-connected control unit 300 is further used to: obtain a current command value in response to the output voltage information, phase information and internal potential amplitude; and perform limitation according to the current command value to obtain a current reference value.

[0193] In some embodiments, the grid-connected control unit 300 is further configured to perform closed-loop control on the output current information based on the current reference value.

[0194] It should be noted that the transient voltage support device of the energy storage converter provided in the embodiment of the present application corresponds to the method embodiments shown in Figures 1 to 8. To avoid repetition, they are not described here.

[0195] The present application also provides a control device for an energy storage converter. Please refer to Figure 10, which is a structural block diagram of a control device for an energy storage converter provided in an embodiment of the present application. The control device may include a processor 510, a communication interface 520, a memory 530 and at least one communication bus 540. Among them, the communication bus 540 is used to realize direct connection and communication between these components. Among them, the communication interface 520 of the control device in the embodiment of the present application is used to communicate signaling or data with other node devices. The processor 510 can be an integrated circuit chip with signal processing capabilities.

[0196] The processor 510 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), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. It can implement or execute the various 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 also be any conventional processor.

[0197] The memory 530 may be, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), etc. The memory 530 stores computer-readable instructions. When the processor 510 executes the computer-readable instructions, the control device may perform the steps involved in the method embodiments of Figures 1 to 8 above.

[0198] Optionally, the control device may further include a storage controller and an input / output unit.

[0199] The memory 530, storage controller, processor 510, peripheral interface, and input / output units are electrically connected to each other directly or indirectly to enable data transmission or interaction. For example, these components can be electrically connected to each other via 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.

[0200] The input and output unit is used to provide users with the ability to create tasks and to create optional time periods or preset execution times for the tasks to enable interaction between the user and the server. The input and output unit can be, but is not limited to, a mouse and a keyboard.

[0201] It is understood that the structure shown in Figure 10 is merely illustrative, and the control device may include more or fewer components than shown in Figure 10, or have a configuration different from that shown in Figure 10. Each component shown in Figure 10 may be implemented using hardware, software, or a combination thereof.

[0202] An embodiment of the present application further provides a storage medium having instructions stored thereon. 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, details are not given here.

[0203] The present application also provides a computer program product, which, when running on a computer, enables the computer to execute the method described in the method embodiment.

[0204] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0205] In addition, the functional modules in each embodiment of the present 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.

[0206] If the functions are implemented in the form of software function 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 the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0207] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0208] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0209] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A transient voltage support method for an energy storage converter, comprising: Obtaining preset reference value data and output electrical information of the energy storage converter; In response to the output power information, obtaining active power information, reactive power information and voltage amplitude information of the grid connection 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, 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 by the grid-connected control data.

2. The transient voltage support method of the energy storage converter according to claim 1, wherein: The preset reference value data includes a reactive power reference value and a voltage amplitude reference value, the grid-connected regulation data includes an 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, the grid-connected regulation data of the energy storage converter is obtained, including: In response to the reactive power reference value, the voltage amplitude reference value, the reactive power information, and the voltage amplitude information, an internal potential amplitude of the energy storage converter is obtained.

3. The transient voltage support method of the energy storage converter according to claim 2, wherein: The preset reference value data also includes an active power reference value, and the method further includes: In response to the active power reference value, an active power limit value is obtained.

4. The transient voltage support method of the energy storage converter according to claim 3, wherein: 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: In response to the active power limit value and the active power information, frequency information and phase angle information of the energy storage converter are obtained.

5. The transient voltage support method of the energy storage converter according to claim 4, wherein: In response to the active power limit value and the active power information, obtaining frequency information and phase angle information of the energy storage converter includes: 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, obtaining frequency information of the energy storage converter; 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.

6. The transient voltage support method of the energy storage converter according to claim 3, wherein: The method further comprises: Acquiring current limit value information of the energy storage converter; The active power amplitude limit value is determined according to the voltage amplitude information, the current amplitude limit value information and the reactive power information, wherein the active power amplitude limit value includes an upper amplitude limit limit and a lower amplitude limit limit.

7. The transient voltage support method of the energy storage converter according to claim 2, wherein: In response to the reactive power reference value, the voltage amplitude reference value, the reactive power information and the voltage amplitude information, obtaining the internal potential amplitude of the energy storage converter comprises: obtaining a reactive power droop output signal in response to the reactive power reference value and the reactive power information; obtaining a voltage droop output signal in response to the voltage amplitude reference value and the voltage amplitude information; In response to the reactive power droop output signal and the voltage droop output signal, an internal potential amplitude of the energy storage converter is obtained.

8. The transient voltage support method of the energy storage converter according to claim 1, wherein: The grid-connected control data includes one or more of internal potential amplitude, frequency information and phase angle information, and the method further includes: 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.

9. The transient voltage support method of the energy storage converter according to claim 8, wherein: The output electrical information of the energy storage converter includes output voltage information and output current information. The method further includes: obtaining a current command value in response to the output voltage information, the phase information and the internal potential amplitude; Limitation is performed according to the current command value to obtain a current reference value.

10. The transient voltage support method of the energy storage converter according to claim 9, wherein: The method further comprises: The output current information is closed-loop controlled based on the current reference value.

11. A transient voltage support device for an energy storage converter, comprising: An acquisition unit, used to acquire preset reference value data and output electrical information of the energy storage converter; A grid connection point unit, in response to the output power information, obtains active power information, reactive power information and voltage amplitude information of the grid connection point; A grid-connected control unit is used to obtain the grid-connected control data of the energy storage converter 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, and control the transient voltage support control of the energy storage converter for grid-connected conversion through the grid-connected control data.

12. 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 when the processor executes the computer program, the steps of the transient voltage support method for the energy storage converter as described in any one of claims 1 to 10 are implemented.

13. A computer-readable storage medium having instructions stored thereon, which, when executed on a computer, enables the computer to execute the transient voltage support method for an energy storage converter according to any one of claims 1 to 10.

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