Transient voltage supporting method, device and equipment of energy storage converter and storage medium

Abstract

The invention provides a transient voltage supporting method, device and equipment of an energy storage converter and a storage medium, and relates to the technical field of grid-connected conversion. The transient voltage supporting method of the energy storage converter comprises the following steps: acquiring preset reference value data and output electric information of the energy storage converter; obtaining active power information, reactive power information and voltage amplitude information of a grid-connected point in response to the output power 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 and control data of the energy storage converter, and controlling the energy storage converter to carry out transient voltage support regulation and control of grid-connected conversion through the grid-connected regulation and control data. According to the method, the transient voltage supporting capability of the energy storage converter and the stability of grid-connected regulation can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of grid-connected conversion, and in particular to a transient voltage support method, device, equipment and storage medium for an energy storage converter. Background Art

[0002] At present, with the continuous development of new energy power generation technology, the application of distributed generation technology and microgrid technology is becoming more and more extensive. In the new power system where distributed generation technology or microgrid technology is applied, power storage technology can improve the reliability and flexibility of power supply, and plays a very important role in the new power system. The energy storage converter is the grid-connected interface of energy storage equipment including electrochemical energy storage equipment.

[0003] Generally, the energy storage converter controlled by the vector control method can adjust the size and angle of the voltage or frequency output by the energy storage converter, but the vector control method needs to rely on the power grid to generate frequency and internal electric heat. The energy storage converter controlled by the self-synchronous voltage source can independently construct the frequency and internal power supply. However, when the power grid has a transient low voltage or transient overvoltage due to short circuit, DC blocking, etc., it is easy to cause several problems in the energy storage converter, including but not limited to overcurrent, too low or too high voltage at the grid connection point, power angle swing and instability. These problems are not only likely to endanger the safety of the equipment, but also to have an adverse effect on the transient process of the power grid. Summary of the invention

[0004] The purpose of the present 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.

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

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

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

[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 by the grid-connected control data.

[0009] 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 the 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 be able to adaptively output the reactive power to support the voltage amplitude of the grid-connected 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.

[0010] Further, 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, obtaining the grid-connected regulation data of the energy storage converter includes:

[0011] 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.

[0012] In the above implementation process, the internal potential amplitude of the energy storage converter is calculated and obtained through the reactive power reference value, the voltage amplitude reference value, the reactive power information and the voltage amplitude information, 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 grid-connected 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 limit value to prevent the active power reference value from exceeding the threshold value, thereby further improving the stability of grid-connected regulation.

[0016] Further, 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, 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, frequency information and phase angle information of the energy storage converter are obtained.

[0018] In the above implementation process, 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 switch signal of the on and off of the power electronic switch in the energy storage converter to improve the stability of grid-connected regulation.

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

[0020] 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;

[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 further comprises:

[0023] Acquiring current limit value information of the energy storage converter;

[0024] 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.

[0025] 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.

[0026] Further, 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:

[0027] obtaining a reactive power droop output signal in response to the reactive power reference value and the reactive power information;

[0028] obtaining a voltage droop output signal in response to the voltage amplitude reference value and the voltage amplitude information;

[0029] 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.

[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, so that the internal potential amplitude of the energy storage converter participates in the grid-connected conversion process of the energy storage converter, and the switch signal of the on and off of the power electronic switch in the energy storage converter is controlled to improve the stability of the grid-connected regulation.

[0031] Further, the grid-connected control data includes one or more of internal potential amplitude, frequency information and phase angle information, and 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] obtaining a current command value in response to the output voltage information, the phase information and the internal potential amplitude;

[0036] Limitation is performed according to the current command value to obtain a current reference value.

[0037] Furthermore, the method further comprises:

[0038] The output current information is closed-loop controlled based on the current reference value.

[0039] In a second aspect, the present application provides a transient voltage support device for an energy storage converter, comprising:

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

[0041] 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;

[0042] 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.

[0043] 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.

[0044] Furthermore, the preset reference value data also includes an active power reference value, and the grid-connected control unit is further used 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 further 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; 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 used to: acquire current limit value information of the energy storage converter; determine the active power limit value according to 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.

[0048] 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 an 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 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.

[0050] 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.

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

[0052] 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.

[0053] In a fourth aspect, the present application provides a computer-readable storage medium, on which instructions are stored. When the instructions are executed on a computer, the computer executes the method as described in any one of the first aspects.

[0054] 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.

[0055] 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.

[0056] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 A schematic flow chart of a transient voltage support method for an energy storage converter provided in an embodiment of the present application;

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

[0060] Figure 3 A second implementation flow chart of the transient voltage support method of the energy storage converter provided in the embodiment of the present application;

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

[0062] Figure 5 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;

[0063] Figure 6 It 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;

[0064] Figure 7 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;

[0065] Figure 8 It 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;

[0066] Fig. 9 A structural block diagram of a transient voltage support device for an energy storage converter provided in an embodiment of the present application;

[0067] Fig.10 A structural block diagram of a control device for an energy storage converter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0068] 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.

[0069] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and 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 cannot be understood as indicating or implying relative importance.

[0070] The energy storage converter may 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 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.

[0071] However, when using a self-synchronous voltage source to control the energy storage converter, the current tolerance of the energy storage converter is very limited, so the ability to output reactive power will be limited by its current tolerance. When the power grid has low voltage or overvoltage, its ability to transiently support the voltage amplitude at the grid connection point is limited. Within the limited current output range, how to effectively support the voltage amplitude at the grid connection point while ensuring that the energy storage converter does not experience power angle swing and power angle instability is a technology that is currently difficult to achieve.

[0072] In order to solve the above problems, an embodiment of the present application proposes a transient voltage support method for an energy storage converter, and 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, and limits the reference value of the active power through the grid-connected control data, applies damping to the active frequency control loop, dynamically modifies the reactive voltage droop coefficient, actively limits the output current of the converter and other measures, so that not only the energy storage converter can adaptively output the reactive power to support the voltage amplitude of the grid-connected point, but 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.

[0073] See also Figure 1 , Figure 1 A schematic flow chart of a transient voltage support method for an energy storage converter provided in an embodiment of the present application, wherein the transient voltage support method for the energy storage converter comprises the following steps:

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

[0075] S200: In response to the output power information, obtaining 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, 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.

[0077] 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;

[0078] 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 obtains the grid-connected control data of the energy storage converter based on the preset reference value data and the output electrical information 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. Measures such as not only enable the energy storage converter to adaptively output the reactive power to support the voltage amplitude of the grid-connected point, but 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.

[0079] See also Figure 2 and Figure 3 , Figure 2 A flowchart of an implementation of a transient voltage support method for an energy storage converter provided in an embodiment of the present application is provided. Figure 3 A second implementation flow chart of the transient voltage support method of the energy storage converter provided in the embodiment of the present application; the transient voltage support method of the energy storage converter is applied to the following three modules (first module, second module, third module):

[0080] 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:

[0081]

[0082] 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 Reactive power information of the grid connection point;

[0083] 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:

[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] 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, 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 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, that is, the Pf droop coefficient used for primary frequency modulation; it also represents the damping of the power angle swing. Transient droop control submodule: used to increase the damping of the power angle swing while keeping the Pf droop coefficient unchanged.

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

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

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

[0093] D: represents the Pf droop coefficient, usually set to 20 to 50;

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

[0095] D dyn : represents the transient droop coefficient, and the recommended setting is 40 to 100;

[0096] ω n : represents the rated angular frequency of the power grid, and its value is 100π=314.1593rad / s;

[0097] It should be noted that the above specific parameter settings are only for reference and not for specific limitation. The corresponding parameters can be adjusted according to the actual situation. The specific parameter settings below are also only for reference and not for specific limitation. The corresponding parameters can be adjusted according to the actual situation, which will not be repeated here.

[0098] 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:

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

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

[0101] The internal potential regulating submodule:

[0102] Where: Q ref is the reactive power reference value, Q s is the reactive power of 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 grid connection point voltage amplitude, ε v is the output of the voltage droop submodule, ε q and ε v is the input of the internal potential regulating submodule, E is the internal potential amplitude, and E is the output of the internal potential regulating submodule, K q ,K v ,T v is a parameter, where K q It is called reactive power droop coefficient, K v It is called voltage droop coefficient;

[0103] In a possible implementation manner, maximum and minimum value limiting is performed on the integrator of the internal potential regulation submodule.

[0104] In a possible implementation, the reactive power droop coefficient K of the reactive power 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.

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

[0106]

[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 in 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:

[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 a possible implementation, the present application provides for K q(v) The calculation description is as follows:

[0112] 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 K can be set q0 =0,K u0 =1; if the reactive voltage needs to meet a certain droop coefficient K qu , then we can set K q0 :K u0 =K qu ;

[0113] In order to obtain better transient voltage support effect, K q1 and K u1 Should meet: K q1 :K​​​u1 =0~0.1;

[0114] U s2 and U s3 They 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);

[0115] Optionally, U s2 and U s3 The purpose of taking 0.85 and 1.15 respectively is to make Figure 2 The reactive voltage droop coefficient in changes continuously, which can reduce the occurrence of oscillation. These two values ​​are recommended values;

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

[0117] 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:

[0118] 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.

[0119] Exemplarily, the internal potential amplitude of the energy storage converter is calculated and obtained through the reactive power reference value, the voltage amplitude reference value, the reactive power information and the voltage amplitude information, so that the internal potential amplitude of the energy storage converter participates in the grid-connected conversion process of the energy storage converter, and the switching signals of the on and off of the power electronic switches in the energy storage converter are controlled to improve the stability of the 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 of the energy storage converter further includes:

[0121] In response to the active power reference value, an active power limit value is obtained.

[0122] Exemplarily, 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 a threshold value, 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, and in response to one or more of preset reference value data, active power information, reactive power information, and voltage amplitude information, the grid-connected control data of the energy storage converter is obtained, including:

[0124] 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.

[0125] 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 the switching signals of the on and off of the power electronic switches in the energy storage converter are controlled to improve the stability of the grid-connected regulation.

[0126] 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:

[0127] 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, the frequency information of the energy storage converter is obtained;

[0128] 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.

[0129] For example, in combination Figure 2 The second module shown, 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.

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

[0131] Obtaining current limit value information of the energy storage converter;

[0132] 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.

[0133] 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 avoid the active power reference value exceeding the threshold value, thereby further improving the stability of the grid-connected regulation.

[0134] 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:

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

[0136] obtaining a voltage droop output signal in response to a voltage amplitude reference value and voltage amplitude information;

[0137] 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.

[0138] For example, in combination Figure 3 The third module shown, ε q is 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) calculates and obtains 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 and off switching signals of the power electronic switches in the energy storage converter to improve the stability of grid-connected regulation.

[0139] See also Figure 4 , Figure 4 A schematic diagram of a network topology for grid-connected control of a self-synchronous voltage source based on an energy storage converter provided in an embodiment of the present application. Figure 4 As shown, 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:

[0140] The 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 ;

[0141] Active power reference value limiting module M2, according to the voltage amplitude information U of the grid connection point s , current limit value I lim , Reactive power information Q of the grid connection points Calculate the limit value of the active power reference value;

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

[0143] 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 v The regulation control generates the reference value E of the internal potential amplitude;

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

[0145]

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

[0147] 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 reverse Park 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;

[0148] The modulation and driving module M8 is used to generate a reference voltage U according to the reference voltage generation module M3. refGenerate a drive signal to control the on and off switching signal of the power electronic switch in the energy storage converter, control and regulate the SOC of the energy storage device, so that the voltage output by the energy storage device passes 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.

[0149] In a possible implementation manner, 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 , Reactive power Q of the grid connection point 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;

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

[0151]

[0152] 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;

[0153] 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:

[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] 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 d2 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 as a parameter.

[0159] In a 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:

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

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

[0162] The internal potential regulating submodule:

[0163] Where: Q ref is the reactive power reference value, Q s is the reactive power of 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 grid connection point voltage amplitude, ε v is the output of the voltage droop submodule, ε q and ε v is the input of the internal potential regulating submodule, E is the internal potential amplitude, and E is the output of the internal potential regulating submodule, K q ,K v ,T v is a parameter, where K q It is called reactive power droop coefficient, K v It is called voltage droop coefficient;

[0164] In a possible implementation, the reactive power droop coefficient K of the reactive power 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.

[0165] 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.

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

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

[0168] Current limiting module M6: according to the current command value, the module M6 limits the amplitude 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, the current size is closed-loop controlled through the module M7.

[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] 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 value.

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

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

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

[0177] The output current information is closed-loop controlled based on the current reference value.

[0178] 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 is simulated and verified in simulation software.

[0179] See also Figure 5 and Figure 6 , Figure 5 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 It 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;

[0180] Figure 6 The simulation results of the transient voltage support control method of the energy storage converter proposed in this application under low voltage fault are shown. Figure 6 Fault conditions and Figure 5 The same as in , but it can be seen that it has a significant supporting effect on the grid connection point voltage, compared with Figure 5 The grid-connected point voltage is lower than 0.3pu and shows a decreasing trend. Figure 6 The voltage amplitude in the circuit always remains at about 0.65 pu. In addition, after the fault is restored, there is no Figure 5 The oscillation shown in the figure indicates that the proposed method can improve the stability of fault ride-through.

[0181] See also Figure 7 and Figure 8 , Figure 7 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 It 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;

[0182] Figure 7 The simulation results of the conventional self-synchronous voltage source control strategy under transient high voltage conditions are shown. It can be seen that under the conventional self-synchronous voltage source control strategy, when the grid voltage rises to 1.4pu at t=3s, and recovers after 0.5s, the voltage amplitude is relatively high during the fault period, about 1.25pu, and the reactive power is almost zero; when the grid voltage recovers, the energy storage converter swings greatly and returns to a steady state after a long time.

[0183] Figure 8 The simulation results of the transient voltage support control method of the energy storage converter proposed in this application are shown in the transient high voltage condition. Figure 7 The same as in , but it can be seen that it has a significant supporting effect on the grid connection point voltage, compared with Figure 7The grid-connected point voltage is about 1.25 pu during the fault period. Figure 8 The voltage amplitude in the circuit is always maintained at about 1.14 pu. In addition, after the fault is restored, the relevant waveform can enter the steady state in a relatively short time, which also shows that the proposed method can improve the stability of fault ride-through.

[0184] 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 the present application.

[0185] See also Fig. 9 , Fig. 9 This 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:

[0186] An 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 obtains active power information, reactive power information and voltage amplitude information of the grid connection point in response to the output power information;

[0188] The grid-connected control unit 300 is used to obtain the 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.

[0189] 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.

[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 used 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 used 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.

[0192] In some embodiments, the grid-connected control unit 300 is also 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.

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

[0194] 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; obtain an 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 the internal potential amplitude, frequency information, and phase angle information, and 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.

[0196] 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 also 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.

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

[0198] It should be noted that the transient voltage support device of the energy storage converter provided in the embodiment of the present application is 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, see Fig.10 , Fig.10A 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. The communication bus 540 is used to realize direct connection and communication between these components. 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 may be an integrated circuit chip having signal processing capabilities.

[0200] The processor 510 mentioned 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), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor 510 can also be any conventional processor, etc.

[0201] 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 electric erasable programmable read-only memory (EEPROM), etc. The memory 530 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 510, the control device may execute the above-mentioned Figures 1 to 8 The method embodiment involves various steps.

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

[0203] The memory 530, storage controller, processor 510, peripheral interface, input and output unit components are directly or indirectly electrically connected to each other to achieve 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.

[0204] The input and output unit is used to provide users with the task creation and to create a start optional time period or preset execution time for the task to realize the interaction between the user and the server. The input and output unit can be, but is not limited to, a mouse and a keyboard.

[0205] Understandably, Fig.10 The structure shown is for illustration only. The control device may also include Fig.10 More or fewer components as shown, or with Fig.10 Different configurations shown. Fig.10 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0206] 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, the method will not be described again here.

[0207] The present application also provides a computer program product, which, when executed on a computer, enables the computer to execute the method described in the method embodiment.

[0208] In several embodiments provided in the present 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 schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to 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 a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order 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 with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

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

[0210] 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 can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods 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.

[0211] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0212] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0213] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A transient voltage support method for an energy storage converter, characterized in that: include: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: include: 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, characterized in that: include: 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, 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 for the energy storage converter according to any one of claims 1 to 10.

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