Control method and device of energy storage converter, storage medium and electronic equipment

Abstract

The invention provides a control method and device of an energy storage converter, a storage medium and electronic equipment, and relates to the technical field of energy storage converters, and the control method of the energy storage converter comprises the steps: obtaining a first voltage value of a power grid, a second voltage value of an output voltage of the energy storage converter, and a first current value of an output current of the energy storage converter; obtaining the compensation active power of the energy storage converter according to the first voltage value, the second voltage value and the first current value; acquiring a first phase difference between the output voltage and the power grid voltage; obtaining an effective voltage value of the energy storage converter; acquiring an effective voltage value of the power grid; according to the compensation active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, obtaining a pre-synchronization voltage value; and adjusting the output voltage of the energy storage converter based on the pre-synchronization voltage value, and switching the working state of the energy storage converter to a grid-connected state. Grid-connected voltage fluctuation is reduced, and power grid stability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage converters, and in particular to a control method, device, storage medium and electronic equipment for an energy storage converter. Background Art

[0002] At present, in the relevant technology, when the energy storage inverter controlled by Virtual Synchronous Generator (VSG) is switched off and on the grid, the frequency changes suddenly due to the difference between the output voltage of the energy storage inverter and the grid voltage amplitude and phase. It is easy to cause voltage distortion after grid connection, which in turn causes grid voltage oscillation and reduces the stability of grid operation. Summary of the invention

[0003] The present invention aims to at least solve the technical problem existing in the prior art or related technology that the output voltage of the energy storage inverter differs from the grid voltage in amplitude and phase, resulting in a sudden change in frequency, which is prone to voltage distortion after grid connection, thereby causing grid voltage oscillation and reducing the stability of grid operation.

[0004] To this end, a first aspect of the present invention provides a control method for an energy storage converter.

[0005] A second aspect of the present invention provides a control device for an energy storage converter.

[0006] A third aspect of the present invention provides a readable storage medium.

[0007] A fourth aspect of the present invention provides an electronic device.

[0008] The first aspect of the present invention proposes a control method for an energy storage inverter, including: obtaining a first voltage value of a power grid, a second voltage value of an output voltage of the energy storage inverter, and a first current value of an output current of the energy storage inverter; obtaining the compensating active power of the energy storage inverter according to the first voltage value, the second voltage value, and the first current value; obtaining a first phase difference between the output voltage and the power grid voltage; obtaining the effective voltage value of the energy storage inverter; obtaining the effective voltage value of the power grid; obtaining a pre-synchronization voltage value according to the compensating active power, the effective voltage value of the energy storage inverter, the effective voltage value of the power grid, the first phase difference, and a first simulation equation; adjusting the output voltage of the energy storage inverter based on the pre-synchronization voltage value, and switching the working state of the energy storage inverter to the grid-connected state.

[0009] The present application provides a control method for an energy storage converter, including obtaining a first voltage value of a power grid; obtaining a second voltage value of the output voltage of the energy storage converter and a first current value of the output current of the energy storage converter, and the obtained voltage value and current value can be Park (coordinate transformation method for motor analysis and control) transformed respectively, and converted to the coordinate axis for easy calculation. The voltage and current quantities in a three-phase stationary coordinate system can be converted into the voltage and current quantities in a two-phase rotating coordinate system, which is convenient for the control and analysis of the energy storage converter. According to the first voltage value, the second voltage value and the first current value, the compensated active power of the energy storage converter is obtained; the introduction of power compensation can improve the reference value of the output active power of the energy storage converter, and can improve the efficiency and stability of the system. Based on the voltage of the power grid, the phase of the power grid voltage is obtained; based on the output voltage of the energy storage converter, the phase of the output voltage of the energy storage converter is obtained; according to the phase of the output voltage and the phase of the power grid voltage, the first phase difference between the output voltage and the power grid voltage is obtained, and the phase difference is introduced, and phase synchronization can be achieved with the help of the phase difference, and phase pre-synchronization can be achieved by simulating the characteristic equation of the synchronous generator and calculating the virtual power and the phase difference. According to the second voltage value, the effective voltage value of the energy storage converter is obtained; according to the first voltage value, the effective voltage value of the power grid is obtained; according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, the pre-synchronization voltage value is obtained. In this step, a proportional integral regulator and an adaptive weight can be introduced to control the voltage on the energy storage converter side to ensure the consistency of the voltage amplitude on both sides of the energy storage converter and the power grid connection point during the grid-connected switching process. The output voltage of the energy storage converter is adjusted based on the pre-synchronization voltage value, and the pre-synchronization voltage value amplitude and pre-synchronization voltage value phase are obtained; the grid-connected voltage amplitude and grid-connected voltage phase are obtained, and when the pre-synchronization voltage value amplitude is equal to the grid-connected voltage amplitude, and the pre-synchronization voltage value phase is equal to the grid-connected voltage phase, the energy storage converter is switched from an off-grid state to a grid-connected state. By synchronously improving the pre-synchronization voltage value phase and the pre-synchronization voltage value amplitude of the energy storage converter, the stabilization steps can be simplified, the pre-synchronization time can be reduced, the amplitude difference and phase difference of the voltage on both sides of the grid-connected point can be eliminated, and smooth grid connection can be achieved.

[0010] Specifically, through the control method of the energy storage converter, when the energy storage converter is in an off-grid state, that is, when the energy storage converter end and the grid end are in a disconnected state, the voltage at the common connection point on the grid can be obtained, thereby obtaining the first voltage value of the grid voltage.

[0011] In addition, the control method of the energy storage converter in the above technical solution provided by the present invention may also have the following additional technical features: In some technical schemes of the present invention, optionally, the output voltage of the energy storage inverter is adjusted based on the pre-synchronization voltage value, and the working state of the energy storage inverter is switched to the grid-connected state, including: adjusting the output voltage of the energy storage inverter based on the pre-synchronization voltage value, and obtaining the pre-synchronization voltage amplitude and the pre-synchronization voltage value phase; obtaining the grid-connected voltage amplitude and the grid-connected voltage phase, and switching the working state of the energy storage inverter to the grid-connected state based on the pre-synchronization voltage value amplitude being equal to the grid-connected voltage amplitude, and the pre-synchronization voltage value phase being equal to the grid-connected voltage phase.

[0012] In this technical solution, the output voltage of the energy storage inverter is adjusted based on the pre-synchronization voltage value, and the working state of the energy storage inverter is switched to the grid-connected state, including: adjusting the output voltage of the energy storage inverter based on the pre-synchronization voltage value, and obtaining the pre-synchronization voltage amplitude and the pre-synchronization voltage value phase, and then obtaining the voltage amplitude and voltage phase of the current power grid through the common connection point at the grid-connected place, that is, obtaining the grid-connected voltage amplitude and the grid-connected voltage phase, and controlling the energy storage inverter to be grid-connected under the condition that the pre-synchronization voltage value amplitude is equal to the grid-connected voltage amplitude, and the pre-synchronization voltage value phase is equal to the grid-connected voltage phase, that is, switching the working state of the energy storage inverter to the grid-connected state, can achieve phase pre-synchronization and amplitude pre-synchronization, thereby improving the smoothness of the grid-connected process, reducing grid-connected fluctuations, eliminating the amplitude difference and phase difference of the voltage on both sides of the grid-connected point, and then achieving smooth grid-connected.

[0013] In some technical solutions of the present invention, optionally, the compensating active power of the energy storage converter is obtained according to the first voltage value, the second voltage value, and the first current value, including: obtaining the active power and reactive power of the energy storage converter based on the second voltage value, the first current value and the first voltage value; obtaining the compensating active power of the energy storage converter based on the active power and the reactive power.

[0014] In this technical solution, the compensated active power of the energy storage converter is obtained according to the first voltage value, the second voltage value, and the first current value, including: obtaining the active power and reactive power of the energy storage converter based on the second voltage value, the first current value, and the first voltage value; obtaining the compensated active power of the energy storage converter based on the active power and the reactive power. It can improve the reference value of the output active power of the energy storage converter in the Virtual Synchronous Generator, VSG (virtual synchronous generator) control, improve the energy utilization of the energy storage converter, and maintain the stability of the output power, which can further improve the efficiency and stability of the system.

[0015] In some technical schemes of the present invention, optionally, a pre-synchronization voltage value is obtained based on the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, including: obtaining the first power value based on the compensated active power and the first simulation equation; obtaining the pre-synchronization voltage value based on the first simulation equation, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first power value.

[0016] In this technical solution, a pre-synchronization voltage value is obtained according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, including: according to the compensated active power and the first simulation equation, the first power value is obtained, the reference value of the active power can be improved, the energy utilization rate of the energy storage converter is improved, and the output power is maintained stable, and the efficiency and stability of the system can be further improved. The pre-synchronization voltage value is obtained according to the first simulation equation, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first power value. The introduction of phase difference and virtual power can realize the phase pre-synchronization of the output voltage, so that the phase difference between the energy storage converter and the two ends of the power grid meets the grid connection requirements, and the amplitude is continued to be pre-synchronized. When the phase difference and the amplitude meet the preset requirements, that is, when both the phase and the amplitude are synchronized, smooth grid connection is achieved.

[0017] In some technical schemes of the present invention, optionally, a pre-synchronization voltage value is obtained according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, including: obtaining a voltage compensation amount according to the effective voltage of the energy storage converter and the effective voltage of the power grid; obtaining a pre-synchronization voltage value based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation.

[0018] In this technical solution, the pre-synchronization voltage value is obtained according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, including: obtaining the voltage compensation amount according to the effective voltage of the energy storage converter and the effective voltage of the power grid; obtaining the pre-synchronization voltage value based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation. This step can pre-synchronize the amplitude, that is, by collecting the effective value of the voltage on both sides of the Point of Common Coupling, PCC (common connection point), the effective voltage of the energy storage converter and the effective voltage of the power grid are subtracted and then the voltage compensation amount is obtained through Proportional-Integral, PI (proportional-integral control). After the pre-synchronization control is started, the voltage compensation amount is added to the reactive power-voltage link of the VSG control, and the output voltage of the VSG control can be adjusted by adjusting the size of the PI parameter.

[0019] In some technical solutions of the present invention, optionally, a pre-synchronization voltage value is obtained based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation, including: obtaining a third voltage value based on the first phase difference and the first simulation equation; obtaining a pre-synchronization voltage value according to the third voltage value, the compensated active power, the voltage compensation amount and the first simulation equation.

[0020] In this technical solution, based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation, the pre-synchronization voltage value is obtained, including: based on the first phase difference and the first simulation equation, the third voltage value is obtained; according to the third voltage value, the compensated active power, the voltage compensation amount and the first simulation equation, the pre-synchronization voltage value is obtained. By improving the phase synchronization link and the amplitude synchronization link of the pre-synchronization voltage value, the pre-synchronization steps can be simplified, the pre-synchronization time can be reduced, the amplitude difference and phase difference of the voltage on both sides of the grid connection point can be eliminated, and smooth grid connection can be achieved.

[0021] In some technical schemes of the present invention, optionally, the compensating active power of the energy storage converter is obtained according to the first voltage value, the second voltage value, and the first current value, including: based on the first voltage value, obtaining the dq-axis component of the first voltage value; based on the second voltage value, obtaining the dq-axis component of the second voltage value; based on the first current value, obtaining the dq-axis component of the first current value; based on the dq-axis component of the first voltage value, the dq-axis component of the second voltage value, and the dq-axis component of the first current value, obtaining the active power and reactive power of the energy storage converter; according to the active power and the reactive power, obtaining the compensating active power of the energy storage converter.

[0022] In this technical solution, the compensated active power of the energy storage converter is obtained according to the first voltage value, the second voltage value, and the first current value, including: based on the first voltage value, obtaining the dq axis component of the first voltage value; based on the second voltage value, obtaining the dq axis component of the second voltage value; based on the first current value, obtaining the dq axis component of the first current value; based on the dq axis component of the first voltage value, the dq axis component of the second voltage value, and the dq axis component of the first current value, obtaining the active power and reactive power of the energy storage converter; according to the active power and reactive power, obtaining the compensated active power of the energy storage converter. The voltage and current in the three-phase stationary coordinate system can be converted into quantities in the two-phase rotating coordinate system, which is convenient for the control and analysis of the energy storage converter. The compensated active power obtained at the same time can improve the reference active power, and can improve the efficiency and stability of the system.

[0023] In a second aspect of the present application, a control device for an energy storage converter is provided, comprising a first acquisition unit, a second acquisition unit, a third acquisition unit, a fourth acquisition unit, a fifth acquisition unit, a sixth acquisition unit and a switching unit, wherein the first acquisition unit is used to acquire a first voltage value of a grid voltage, a second voltage value of an output voltage of the energy storage converter, and a first current value of an output current of the energy storage converter; the second acquisition unit is used to acquire a compensating active power of the energy storage converter according to the first voltage value, the second voltage value, and the first current value; the third acquisition unit is used to acquire a first phase difference between the output voltage and the grid voltage; the fourth acquisition unit is used to acquire an effective voltage value of the energy storage converter; the fifth acquisition unit is used to acquire an effective voltage value of the grid; the sixth acquisition unit is used to acquire a pre-synchronization voltage value according to the compensating active power, the effective voltage value of the energy storage converter, the effective voltage value of the grid, the first phase difference, and a first simulation equation; the switching unit is used to adjust the output voltage of the energy storage converter based on the pre-synchronization voltage value, and switch the working state of the energy storage converter to a grid-connected state.

[0024] The present application provides a control device for an energy storage converter, comprising a first acquisition unit, a second acquisition unit, a third acquisition unit, a fourth acquisition unit, a fifth acquisition unit, a sixth acquisition unit and a switching unit. The first acquisition unit is used to acquire a first voltage value of a grid voltage, a second voltage value of an output voltage of the energy storage converter, and a first current value of an output current of the energy storage converter; the acquired voltage value and current value can be Park (coordinate transformation method for motor analysis and control) transformed respectively and converted to the coordinate axis for easy calculation. The second acquisition unit is used to acquire the compensating active power of the energy storage converter according to the first voltage value, the second voltage value, and the first current value; the third acquisition unit is used to acquire a first phase difference between the output voltage and the grid voltage, introduce a phase difference, and achieve phase synchronization with the help of the phase difference. By simulating the characteristic equation of a synchronous generator, the virtual power and the phase difference are calculated, and phase pre-synchronization can be achieved. The fourth acquisition unit is used to acquire the effective voltage value of the energy storage converter; the fifth acquisition unit is used to acquire the effective voltage value of the power grid; the sixth acquisition unit is used to acquire the pre-synchronization voltage value according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation; the switching unit is used to adjust the output voltage of the energy storage converter based on the pre-synchronization voltage value, and switch the working state of the energy storage converter to the grid-connected state, and a proportional-integral regulator and an adaptive weight can be introduced to control the voltage on the energy storage converter side to ensure the consistency of the voltage amplitude during the grid-connected switching process. The control device of the energy storage converter can simplify the stabilization step, reduce the pre-synchronization time, eliminate the amplitude difference and phase difference of the voltage on both sides of the grid-connected point, and then achieve smooth grid connection by synchronously improving the phase of the pre-synchronization voltage value and the amplitude of the pre-synchronization voltage value of the energy storage converter.

[0025] According to a third aspect of the present application, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the control method of the energy storage converter as described in any one of the above technical solutions are implemented.

[0026] Since the readable storage medium provided in the technical solution of the present application stores thereon a program or instruction which, when executed by a processor, implements the steps of the control method of the energy storage inverter as in any one of the above technical solutions, the readable storage medium has all the beneficial effects of the steps of the control method of the energy storage inverter as in any one of the above technical solutions, which will not be repeated here.

[0027] A fourth aspect of the present application provides an electronic device, comprising a control device for an energy storage converter as in the above technical solution; or a readable storage medium as in the above technical solution.

[0028] Since the electronic device provided in the technical solution of the present application includes the control device of the energy storage converter in the above technical solution; or the readable storage medium in the above technical solution, the electronic device has all the beneficial effects of the control device of the energy storage converter or the readable storage medium in any of the above technical solutions, which will not be described in detail here.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 One of the flow charts of a control method for an energy storage converter according to an embodiment of the present invention; Figure 2 A structural block diagram of a control device for an energy storage converter according to an embodiment of the present invention; Figure 3 This is a second flow chart of a control method for an energy storage converter according to an embodiment of the present invention; Figure 4 A topological structure block diagram of an energy storage converter according to an embodiment of the present invention; Figure 5 It is an overall schematic block diagram of a VSG control strategy of a control method for an energy storage converter according to an embodiment of the present invention; Figure 6 The present invention is a schematic block diagram of an improved phase synchronization link of a control method for an energy storage converter according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0033] Refer to the following Figures 1 to 6 The control method, device, storage medium and electronic device of the energy storage converter according to some embodiments of the present invention are described.

[0034] like Figure 1As shown, in an embodiment of the present invention, a control method for an energy storage converter is provided, comprising: Step 102: Acquire a first voltage value of the power grid, a second voltage value of the output voltage of the energy storage converter, and a first current value of the output current of the energy storage converter; Step 104: acquiring the compensation active power of the energy storage converter according to the first voltage value, the second voltage value and the first current value; Step 106: Obtain a first phase difference between the output voltage and the grid voltage; Step 108: Obtaining an effective voltage value of the energy storage converter; Step 110: Obtaining an effective voltage value of the power grid; Step 112: acquiring a pre-synchronization voltage value according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation; Step 114: adjusting the output voltage of the energy storage converter based on the pre-synchronization voltage value, and switching the working state of the energy storage converter to the grid-connected state.

[0035] The present application provides a control method for an energy storage converter, comprising: obtaining a first voltage value of a power grid, a second voltage value of an output voltage of an energy storage converter, and a first current value of an output current of an energy storage converter, and the obtained voltage value and current value can be respectively subjected to Park (coordinate transformation method for motor analysis and control) transformation, and converted to the coordinate axis for easy calculation. The voltage and current in a three-phase stationary coordinate system can be converted into quantities in a two-phase rotating coordinate system, which is convenient for the control and analysis of the energy storage converter. According to the first voltage value, the second voltage value, and the first current value, the compensated active power of the energy storage converter is obtained; the reference active power can be improved by introducing power compensation, and the efficiency and stability of the system can be improved. Based on the voltage of the power grid, the phase of the power grid voltage is obtained; based on the output voltage of the energy storage converter, the phase of the output voltage of the energy storage converter is obtained; according to the phase of the output voltage and the phase of the power grid voltage, the first phase difference between the output voltage and the power grid voltage is obtained, and the phase difference is introduced, and phase synchronization can be achieved with the help of the phase difference, and phase pre-synchronization can be achieved by simulating the characteristic equation of the synchronous generator and calculating the virtual power and the phase difference. According to the second voltage value, the effective voltage value of the energy storage converter is obtained; according to the first voltage value, the effective voltage value of the power grid is obtained; according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, the pre-synchronization voltage value is obtained. In this step, a proportional integral regulator and an adaptive weight can be introduced to control the voltage on the energy storage converter side to ensure the consistency of the voltage amplitude during the grid-connected switching process. The output voltage of the energy storage converter is adjusted based on the pre-synchronization voltage value, and the pre-synchronization voltage value amplitude and the pre-synchronization voltage value phase are obtained; the grid-connected voltage amplitude and the grid-connected voltage phase are obtained, and the energy storage converter is switched from the off-grid state to the grid-connected state based on the pre-synchronization voltage value amplitude being equal to the grid-connected voltage amplitude, and the pre-synchronization voltage value phase being equal to the grid-connected voltage phase. By synchronously improving the pre-synchronization voltage value phase and the pre-synchronization voltage value amplitude of the energy storage converter, the stabilization step can be simplified, the pre-synchronization time can be reduced, the amplitude difference and phase difference of the voltage on both sides of the grid-connected point can be eliminated, and then smooth grid connection can be achieved.

[0036] Specifically, through the control method of the energy storage converter, when the energy storage converter is in an off-grid state, that is, when the energy storage converter end and the grid end are in a disconnected state, the voltage at the common connection point on the grid can be obtained, thereby obtaining the first voltage value of the grid voltage.

[0037] In some embodiments of the present invention, optionally, the output voltage of the energy storage inverter is adjusted based on the pre-synchronization voltage value, and the working state of the energy storage inverter is switched to the grid-connected state, including: adjusting the output voltage of the energy storage inverter based on the pre-synchronization voltage value, and obtaining the pre-synchronization voltage amplitude and the pre-synchronization voltage value phase; obtaining the grid-connected voltage amplitude and the grid-connected voltage phase, and switching the working state of the energy storage inverter to the grid-connected state based on the pre-synchronization voltage value amplitude being equal to the grid-connected voltage amplitude, and the pre-synchronization voltage value phase being equal to the grid-connected voltage phase.

[0038] In this embodiment, the output voltage of the energy storage inverter is adjusted based on the pre-synchronization voltage value, and the working state of the energy storage inverter is switched to the grid-connected state, including: adjusting the output voltage of the energy storage inverter based on the pre-synchronization voltage value, and obtaining the pre-synchronization voltage amplitude and the pre-synchronization voltage value phase, and then obtaining the voltage amplitude and voltage phase of the current power grid through the common connection point at the grid-connected place, that is, obtaining the grid-connected voltage amplitude and the grid-connected voltage phase, and controlling the energy storage inverter to be grid-connected under the condition that the pre-synchronization voltage value amplitude is equal to the grid-connected voltage amplitude, and the pre-synchronization voltage value phase is equal to the grid-connected voltage phase, that is, switching the working state of the energy storage inverter to the grid-connected state, can achieve phase pre-synchronization and amplitude pre-synchronization, thereby improving the smoothness of the grid-connected process, reducing grid-connected fluctuations, eliminating the amplitude difference and phase difference of the voltage on both sides of the grid-connected point, and then achieving smooth grid-connected.

[0039] In some embodiments of the present invention, optionally, the compensating active power of the energy storage converter is obtained according to the first voltage value, the second voltage value, and the first current value, including: obtaining the active power and reactive power of the energy storage converter based on the second voltage value, the first current value, and the first voltage value; obtaining the compensating active power of the energy storage converter based on the active power and the reactive power.

[0040] In this embodiment, the compensated active power of the energy storage converter is obtained according to the first voltage value, the second voltage value, and the first current value, including: obtaining the active power and reactive power of the energy storage converter based on the second voltage value, the first current value, and the first voltage value; obtaining the compensated active power of the energy storage converter based on the active power and the reactive power. It can improve the active power reference in the control of Virtual Synchronous Generator, VSG (virtual synchronous generator), improve the energy utilization of the energy storage converter, and maintain the stability of the output power, which can further improve the efficiency and stability of the system.

[0041] In some embodiments of the present invention, optionally, a pre-synchronization voltage value is obtained based on the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, including: obtaining the first power value based on the compensated active power and the first simulation equation; obtaining the pre-synchronization voltage value based on the first simulation equation, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first power value.

[0042] In this embodiment, the pre-synchronization voltage value is obtained according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, including: according to the compensated active power and the first simulation equation, the first power value is obtained, the reference value of the active power can be improved, the energy utilization rate of the energy storage converter is improved, and the output power is maintained stable, and the efficiency and stability of the system can be further improved. The pre-synchronization voltage value is obtained according to the first simulation equation, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first power value. The introduction of phase difference and virtual power can realize the phase pre-synchronization of the output voltage, and when the phase difference meets the requirements, the amplitude is continued to be pre-synchronized. When the phase difference and the amplitude meet the preset requirements, that is, when both the phase and the amplitude are synchronized, smooth grid connection is achieved.

[0043] In some embodiments of the present invention, optionally, a pre-synchronization voltage value is obtained based on the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, including: obtaining a voltage compensation amount based on the effective voltage of the energy storage converter and the effective voltage of the power grid; obtaining a pre-synchronization voltage value based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation.

[0044] In this embodiment, the pre-synchronization voltage value is obtained according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation, including: obtaining the voltage compensation amount according to the effective voltage of the energy storage converter and the effective voltage of the power grid; obtaining the pre-synchronization voltage value based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation. This step can pre-synchronize the amplitude, that is, by collecting the effective value of the voltage on both sides of the PCC point, the effective voltage of the energy storage converter and the effective voltage of the power grid are subtracted and then the voltage compensation amount is obtained through Proportional-Integral, PI (proportional-integral control). After the pre-synchronization control is started, the voltage compensation amount is added to the reactive power-voltage link of the VSG control, and the output voltage of the VSG control can be adjusted by adjusting the size of the PI parameter.

[0045] In some embodiments of the present invention, optionally, a pre-synchronization voltage value is obtained based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation, including: obtaining a third voltage value based on the first phase difference and the first simulation equation; obtaining a pre-synchronization voltage value according to the third voltage value, the compensated active power, the voltage compensation amount and the first simulation equation.

[0046] In this embodiment, based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation, the pre-synchronization voltage value is obtained, including: based on the first phase difference and the first simulation equation, the third voltage value is obtained; according to the third voltage value, the compensated active power, the voltage compensation amount and the first simulation equation, the pre-synchronization voltage value is obtained. By improving the phase synchronization link and the amplitude synchronization link of the pre-synchronization voltage value, the pre-synchronization steps can be simplified, the pre-synchronization time can be reduced, the amplitude difference and phase difference of the voltage on both sides of the grid connection point can be eliminated, and then smooth grid connection can be achieved.

[0047] In some embodiments of the present invention, optionally, the compensating active power of the energy storage converter is obtained according to the first voltage value, the second voltage value, and the first current value, including: obtaining the dq-axis component of the first voltage value based on the first voltage value; obtaining the dq-axis component of the second voltage value based on the second voltage value; obtaining the dq-axis component of the first current value based on the first current value; obtaining the active power and reactive power of the energy storage converter based on the dq-axis component of the first voltage value, the dq-axis component of the second voltage value, and the dq-axis component of the first current value; obtaining the compensating active power of the energy storage converter according to the active power and the reactive power.

[0048] In this embodiment, the compensated active power of the energy storage converter is obtained according to the first voltage value, the second voltage value, and the first current value, including: based on the first voltage value, obtaining the dq axis component of the first voltage value; based on the second voltage value, obtaining the dq axis component of the second voltage value; based on the first current value, obtaining the dq axis component of the first current value; based on the dq axis component of the first voltage value, the dq axis component of the second voltage value, and the dq axis component of the first current value, obtaining the active power and reactive power of the energy storage converter; according to the active power and reactive power, obtaining the compensated active power of the energy storage converter. The voltage and current in the three-phase stationary coordinate system can be converted into quantities in the two-phase rotating coordinate system, which is convenient for the control and analysis of the energy storage converter. The compensated active power obtained at the same time can improve the reference active power, and can improve the efficiency and stability of the system.

[0049] like Figure 2As shown, in an embodiment of the present application, a control device 200 for an energy storage converter is provided, comprising a first acquisition unit 210, a second acquisition unit 220, a third acquisition unit 230, a fourth acquisition unit 240, a fifth acquisition unit 250, a sixth acquisition unit 260 and a switching unit 270, wherein the first acquisition unit 210 is used to acquire a first voltage value of a grid voltage, a second voltage value of an output voltage of the energy storage converter, and a first current value of an output current of the energy storage converter; the second acquisition unit 220 is used to acquire a compensation active power of the energy storage converter according to the first voltage value, the second voltage value, and the first current value. power; a third acquisition unit 230 is used to acquire a first phase difference between the output voltage and the grid voltage; a fourth acquisition unit 240 is used to acquire the effective voltage value of the energy storage inverter; a fifth acquisition unit 250 is used to acquire the effective voltage value of the grid; a sixth acquisition unit 260 is used to acquire a pre-synchronization voltage value according to the compensated active power, the effective voltage value of the energy storage inverter, the effective voltage value of the grid, the first phase difference and the first simulation equation; a switching unit 270 is used to adjust the output voltage of the energy storage inverter based on the pre-synchronization voltage value, and switch the working state of the energy storage inverter to the grid-connected state.

[0050] The control device 200 of the energy storage converter provided in the present application includes a first acquisition unit 210, a second acquisition unit 220, a third acquisition unit 230, a fourth acquisition unit 240, a fifth acquisition unit 250, a sixth acquisition unit 260 and a switching unit 270. The first acquisition unit 210 is used to acquire a first voltage value of the grid voltage, a second voltage value of the output voltage of the energy storage converter, and a first current value of the output current of the energy storage converter; the acquired voltage value and current value can be Park (coordinate transformation method for motor analysis and control) transformed respectively, and converted to the coordinate axis for easy calculation. The second acquisition unit 220 is used to acquire the compensated active power of the energy storage converter according to the first voltage value, the second voltage value, and the first current value; the third acquisition unit 230 is used to acquire the first phase difference between the output voltage and the grid voltage, introduce the phase difference, and phase synchronization can be achieved with the help of the phase difference. By simulating the characteristic equation of the synchronous generator and calculating the virtual power and the phase difference, phase pre-synchronization can be achieved. The fourth acquisition unit 240 is used to acquire the effective voltage value of the energy storage converter; the fifth acquisition unit 250 is used to acquire the effective voltage value of the power grid; the sixth acquisition unit 260 is used to acquire the pre-synchronization voltage value according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation; the switching unit 270 is used to adjust the output voltage of the energy storage converter based on the pre-synchronization voltage value, and switch the working state of the energy storage converter to the grid-connected state, and a proportional integral regulator and an adaptive weight can be introduced to control the voltage on the energy storage converter side to ensure the consistency of the voltage amplitude during the grid-connected switching process. The control device 200 of the energy storage converter can simplify the stabilization step, reduce the pre-synchronization time, eliminate the amplitude difference and phase difference of the voltage on both sides of the grid-connected point, and then achieve smooth grid connection by synchronously improving the phase of the pre-synchronization voltage value and the amplitude of the pre-synchronization voltage value of the energy storage converter.

[0051] In an embodiment of the present application, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the control method of the energy storage converter as described in any one of the above embodiments are implemented.

[0052] Since the readable storage medium provided in the embodiments of the present application stores thereon a program or instruction which, when executed by a processor, implements the steps of the control method for the energy storage inverter as in any one of the above embodiments, the readable storage medium has all the beneficial effects of the steps of the control method for the energy storage inverter as in any one of the above embodiments, which will not be repeated here.

[0053] In an embodiment of the present application, an electronic device is provided, including a control device for an energy storage converter as in the above embodiment; or a readable storage medium as in the above embodiment.

[0054] Since the electronic device provided in the embodiments of the present application includes the control device of the energy storage converter in the above embodiments; or the readable storage medium in the above embodiments, the electronic device has all the beneficial effects of the control device of the energy storage converter and the readable storage medium in any of the above embodiments, which will not be described in detail here.

[0055] In the embodiment of the present application, when controlling the energy storage converter, a mechanical equation of a virtual synchronous generator is required, as shown in the following equation:

[0056] Where: T m and T e are the mechanical torque of the energy storage converter functional device and the electromagnetic torque of the generator, ω and ω ref are the angular velocity and rated angular velocity of the rotor respectively, is the derivative operation of angular velocity with respect to time t, θ is the generator power angle, is the derivative operation of the generator power angle with respect to time t; D is the damping coefficient; J is the rotor moment of inertia. The inverter is also needed in the grid-connected stage of the energy storage converter. Due to the introduction of J and D, the inverter using the VSG algorithm can have the inertia and ability to suppress grid power oscillation, P m The output power of the prime mover (i.e. the device that supplies energy to the energy storage converter), P e is the output power of the generator.

[0057] The reactive voltage regulation link can be carried out through the VSG reactive voltage regulation equation. The specific equation is:

[0058] in, E is the actual output voltage, E ref is the reference voltage, Q e is the actual output reactive power, Q ref is the reference reactive power, k q is the reactive power droop coefficient.

[0059] In the step of improving the reference active power by compensating the active power, it is necessary to obtain the supplementary active power, which can be obtained by the following equation:

[0060] Among them, P ref is the reference value of output active power, Δ P Indicates the compensation active power,P 0 is the rated active power, f and f 0 are the angular frequency and rated angular frequency of the rotor respectively, K is the angular frequency difference adjustment coefficient, T is the angular frequency change speed adjustment coefficient, is the derivative operation of the rotor's angular frequency with respect to time t.

[0061] The phase difference is calculated by collecting the output voltage of the energy storage converter and the grid voltage, and added to the active-frequency link of the VSG control as compensation. The compensated phase difference can be used to maintain the phase consistency of the voltage on both sides of the common connection point between the grid and the energy storage converter.

[0062] Based on the output voltage and output current obtained in the system, the phase information is calculated by the sine and cosine trigonometric functions to obtain the first phase difference Δθ. The relationship between the virtual active power, the assumed virtual line resistance, the effective value of the VSG output voltage, the effective value of the grid voltage and the phase difference is:

[0063] in, P v is the virtual active power, R v To assume the imaginary line resistance, U o and U g Respectively represent the effective value of VSG output voltage and the effective value of grid voltage, Q v is the virtual reactive power.

[0064] Furthermore, the first phase difference can be obtained by the following equation:

[0065] in, P v is the virtual active power, R v To assume the imaginary line resistance, U o and U g Respectively represent the effective value of VSG output voltage and grid voltage. When the energy storage converter is pre-connected to the grid, phase pre-synchronization is required first, that is, Δ θ When it is equal to 0, the voltage amplitude pre-synchronization is performed. Only when the output voltage phase and output voltage amplitude are in synchronization with the voltage phase and amplitude on the grid side, grid-connected operation can be performed.

[0066] Specifically, amplitude pre-synchronization refers to adjusting the amplitude of the grid-connected voltage so that the amplitude of the grid-connected voltage is pre-synchronized with the voltage of the power grid. The amplitude pre-synchronization control is to collect the effective values ​​of the voltages on both sides of the PCC point, and the difference between the two voltage effective values ​​is obtained through PI control to obtain the voltage compensation Δu. After the pre-synchronization control is started, the voltage compensation Δu is added to the reactive power-voltage link of the VSG control. The output voltage of the VSG control can be adjusted by adjusting the size of the PI parameters.

[0067] The voltage amplitude difference between the VSG output side and the grid side is used as a variable, and the weight between the voltage differences is adjusted by the weight factor k. When the weight factor k is reduced, the adjustment of the voltage amplitude difference can be accelerated, but it will produce large power fluctuations and affect the stable operation of the system; when k is increased, the adjustment of the voltage amplitude difference is reduced, the power fluctuation is reduced, but the pre-synchronization time will be increased, which is not conducive to rapid grid connection. Therefore, an adaptive weight factor is used. The specific relationship between the weight factor and the voltage amplitude is:

[0068] Among them, k is the weight factor, e is the base of the natural logarithm, k w is the weight factor adjustment coefficient; after adding the adaptive weight factor, when the voltage amplitude difference is large, the weight factor will be correspondingly large, which is conducive to system stability; when the voltage amplitude difference is uu g When it is smaller, the weight factor will be correspondingly smaller, which is conducive to the rapid grid connection of VSG control.

[0069] The control equation of the reactive link of the energy storage converter is:

[0070] Based on the above equation, the voltage amplitude is adjusted by introducing the reactive link of the energy storage converter, where E is the voltage reference value on the grid side, k q is the reactive power droop coefficient. The droop slope can be adjusted according to the droop relationship. e is the reactive power loss of the system, Q ref is the system reactive power, and the voltage amplitude is U g -U0,E ref is the reference voltage, is the adjustment coefficient.

[0071] Based on the above equation, the grid-side voltage and the output voltage of the energy storage converter can also be differentiated, and the proportional integral coefficient can be improved through the PI controller so that the voltage amplitude difference on both sides of the PCC point meets the grid connection requirements.

[0072] The voltage output by the VSG pre-synchronous control is transformed by Parker to generate U d ,U d_ref and U q , U q_ref After PI control, a reference current vector is generated; after the inverter output current is subjected to the same operation, PI control is performed on the reference output current to generate a PWM drive signal to control the operation of the switch tube.

[0073] Obtain the grid-connected voltage amplitude and grid-connected voltage phase, and switch the energy storage converter from the off-grid state to the grid-connected state based on the pre-synchronization voltage amplitude being equal to the grid-connected voltage amplitude, and the pre-synchronization voltage phase being equal to the grid-connected voltage phase, wherein a threshold value can be preset to determine whether to control the switch tube to open by controlling the PWM drive signal, that is, to enter the grid-connected state. Among them, the thresholds of frequency difference, phase difference, and voltage difference can be set, that is, the following inequality:

[0074] Among them, Δω, Δθ, and ΔU are the frequency difference, phase difference, and voltage difference between the microgrid and the three-phase grid, respectively; A, B, and C are the thresholds of the frequency difference, phase difference, and voltage difference, respectively. When the frequency difference, phase difference, and voltage difference between the microgrid and the three-phase grid meet the above conditions, sliding grid connection is performed.

[0075] like Figure 3 As shown, the control method of the energy storage converter includes: Step 402: Park transformation is performed on the output voltage value, output current value and grid voltage value of the energy storage converter respectively; Step 404: adopting VSG control to simulate the synchronous generator rotor motion characteristic equation; Step 406: improving the reference active power and introducing power compensation; Step 408: The phase difference between the output voltage and the grid-side voltage is obtained by calculating the virtual active power, and is added to the active-frequency link as compensation; Step 410: The voltage difference between the output voltage and the grid-side voltage is added to the reactive-voltage link as compensation through a PI controller with an adaptive weight coefficient; Step 412: Determine whether the voltage amplitudes are the same; If the result of step 412 is yes, then step 414 is executed. If the result of step 412 is no, then step 410 is executed. Step 414: Determine whether the frequency and phase are the same; If the result of step 414 is yes, then execute step 416; if the result of step 414 is no, then execute step 408; Step 416: Disconnect the pre-synchronization switch to achieve smooth grid connection.

[0076] like Figure 4 , Figure 5 and Figure 6 As shown, the energy storage converter includes circuit S1, circuit S2, circuit S3, circuit S4, circuit S5, circuit S6 and PCC switch, i.e., the switch at the common connection point, which is used to control off-grid and on-grid operation. dc The output AC power is connected to the AC grid through the LC filter circuit, where the LC filter circuit is composed of a capacitive element C and an inductive element. The energy storage converter also includes a grounding point e a 、e b and e c .

[0077] like Figure 5 As shown, the present invention includes a voltage and current analog signal sampling module, an AD (Analog-to-Digital) conversion module, an instantaneous power calculation module, an active control loop, a reactive control loop, and a modulation wave synthesis module. The control part adopts virtual synchronous machine control and voltage and current dual closed-loop control. First, the three-phase voltage and current of the power grid are collected through the measurement circuit. After the coordinate change, the active power and reactive power actually output by the virtual synchronous machine are calculated. Then, the virtual synchronous machine control algorithm is used, and the rotor motion equation and the stator voltage equation are used to make the system have inertial damping and electromagnetic transient characteristics. Finally, the command value of the voltage signal is obtained. After the coordinate inverse transformation, the three-phase voltage command signal is obtained. The pulse is generated by the PWM (Pulse Width Modulation) pulse production module to control the grid-connected inverter and realize the control of the converter switch tube, that is, the output voltage and output current of the energy storage converter, that is, i, are first obtained. o and v o , and then use Power Calculate (power calculation module) to get the active power P and reactive power Q, and then use the active power reference value P ref and reactive power reference value Q ref The active power P and reactive power Q are compensated respectively, and the detected angular velocity ω is compared with the angular velocity reference value ω ref Calculate and get the angular velocity. Input the compensated active power, compensated unpowered power and angular velocity into the algorithm model of the virtual synchronous generator based on the stator electrical equation and the rotor mechanical equation, that is, after performing I / ω, I / J and I / s processing in sequence, the voltage value and angular velocity are obtained. Then, the reference voltage v is obtained according to the voltage value and angular velocity. ref , while v ref Perform coordinate transformation (abc / dq), and convert the reference voltage v after coordinate transformation refEntering the voltage and current double closed-loop control, the three-phase current i Labc And the output voltage v0 is transformed into coordinates, and then according to the transformed v od and v oq 、v ref and Labc The current after coordinate transformation is input into multiple PIs (proportional-integral regulators) to obtain a voltage signal, and finally the voltage signal is input into a PWM module (PWM Generator) to generate pulses, which can control whether circuits S1, S2, S3, S4, S5, and S6 are on or off. U is the pre-synchronization voltage, θ is the pre-synchronization voltage phase, and n is the synchronization angular velocity. The introduction of the damping coefficient D enables the microgrid inverter using the VSG algorithm to have inertia and the ability to suppress grid power oscillation.

[0078] The specific process is to first sample the output voltage signal, output current signal, grid voltage signal and grid current signal of the energy storage converter, and then adopt the algorithm model of the virtual synchronous generator based on the stator electrical equation and rotor mechanical equation, and introduce the adaptive adjustable moment of inertia J, and collect the change of system frequency through the ELM neural network algorithm. and frequency change Tracking predictive active power-frequency control damping parameter D. Among them, Figure 5 , which is a schematic block diagram of the VSG control strategy of the control method of the energy storage converter according to an embodiment of the present invention, that is, the process of the algorithm model of the virtual synchronous generator based on the stator electrical equation and the rotor mechanical equation, wherein it can be understood that the mechanical part of the synchronous generator can be expressed as T j =T m -T e -T D , where T j is the inertia torque of the rotor; T m is the mechanical torque; T e is the electromagnetic torque; T D is the damping torque in the system. This equation can be rewritten as an equation with power-speed as a variable:

[0079] Where J is the moment of inertia; ω is the actual angular velocity, Δω is the velocity difference between the two; P m is the input mechanical power; P e is the output electromagnetic power; D is the damping coefficient, ω0 is the initial angular velocity, T m is the mechanical torque, T e is the electromagnetic torque, and θ is the synchronous angular velocity.

[0080] like Figure 6 As shown, the voltage on the energy storage converter side and the grid voltage are ( U o and U g ) Calculate the active power through Power Calulation (power calculation module) P v , and then the active power P v and one-third the virtual resistance R v The virtual current is calculated and then multiplied by the square of the output voltage of the energy storage converter. The phase difference Δθ is obtained by performing proportional integral calculation.

[0081] In the claims, specification and drawings of the present invention, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, which is only for the purpose of more conveniently describing the present invention and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limiting the present invention; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances of the above data.

[0082] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for an energy storage converter, characterized in that: include: Acquire a first voltage value of a grid voltage, a second voltage value of an output voltage of the energy storage converter, and a first current value of an output current of the energy storage converter; Acquire the compensating active power of the energy storage converter according to the first voltage value, the second voltage value and the first current value; Acquire a first phase difference between the output voltage and the grid voltage; Obtaining an effective voltage value of the energy storage converter and an effective voltage value of the power grid; Acquire a pre-synchronization voltage value according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and a first simulation equation; The output voltage of the energy storage converter is adjusted based on the pre-synchronization voltage value, and the working state of the energy storage converter is switched to a grid-connected state.

2. The control method of the energy storage converter according to claim 1, characterized in that: The step of adjusting the output voltage of the energy storage converter based on the pre-synchronization voltage value and switching the working state of the energy storage converter to a grid-connected state includes: Adjusting the output voltage of the energy storage converter based on the pre-synchronization voltage value, and obtaining the pre-synchronization voltage amplitude and the pre-synchronization voltage value phase; The grid-connected voltage amplitude and the grid-connected voltage phase are obtained, and when the pre-synchronization voltage amplitude is equal to the grid-connected voltage amplitude and the pre-synchronization voltage phase is equal to the grid-connected voltage phase, the working state of the energy storage converter is switched to the grid-connected state.

3. The control method of the energy storage converter according to claim 1, characterized in that: The acquiring the compensating active power of the energy storage converter according to the first voltage value, the second voltage value and the first current value includes: Based on the second voltage value, the first current value and the first voltage value, acquiring the active power and reactive power of the energy storage converter; Based on the active power and the reactive power, the compensation active power of the energy storage converter is obtained.

4. The control method of the energy storage converter according to claim 3, characterized in that: The obtaining of the pre-synchronization voltage value according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation comprises: Obtaining a first power value according to the compensated active power and a first simulation equation; A pre-synchronization voltage value is acquired according to the first simulation equation, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first power value.

5. The control method of the energy storage converter according to claim 1, characterized in that: The obtaining of the pre-synchronization voltage value according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and the first simulation equation comprises: Obtaining a voltage compensation amount according to the effective voltage of the energy storage converter and the effective voltage of the power grid; A pre-synchronization voltage value is acquired based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation.

6. The control method of the energy storage converter according to claim 5, characterized in that: The obtaining of a pre-synchronization voltage value based on the compensated active power, the voltage compensation amount, the first phase difference and the first simulation equation comprises: Based on the first phase difference and the first simulation equation, obtaining a third voltage value; A pre-synchronization voltage value is acquired according to the third voltage value, the compensated active power, the voltage compensation amount and the first simulation equation.

7. The control method of the energy storage converter according to claim 1, characterized in that: The acquiring the compensating active power of the energy storage converter according to the first voltage value, the second voltage value and the first current value includes: Based on the first voltage value, acquiring a dq-axis component of the first voltage value; Based on the second voltage value, acquiring a dq-axis component of the second voltage value; Based on the first current value, obtaining a dq-axis component of the first current value; Based on the dq-axis component of the first voltage value, the dq-axis component of the second voltage value, and the dq-axis component of the first current value, acquiring the active power and the reactive power of the energy storage converter; The compensating active power of the energy storage converter is obtained according to the active power and the reactive power.

8. A control device for an energy storage converter, characterized in that: include: A first acquisition unit, used to acquire a first voltage value of a grid voltage, a second voltage value of an output voltage of the energy storage converter, and a first current value of an output current of the energy storage converter; A second acquisition unit, configured to acquire the compensating active power of the energy storage converter according to the first voltage value, the second voltage value, and the first current value; A third acquisition unit, configured to acquire a first phase difference between the output voltage and the grid voltage; A fourth acquisition unit, used to acquire an effective voltage value of the energy storage converter; A fifth acquisition unit, used to acquire an effective voltage value of the power grid; a sixth acquisition unit, configured to acquire a pre-synchronization voltage value according to the compensated active power, the effective voltage value of the energy storage converter, the effective voltage value of the power grid, the first phase difference and a first simulation equation; A switching unit is used to adjust the output voltage of the energy storage converter based on the pre-synchronization voltage value and switch the working state of the energy storage converter to a grid-connected state.

9. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or the instruction is executed by a processor, the steps of the method for controlling the energy storage converter according to any one of claims 1 to 7 are implemented.

10. An electronic device, characterized in that: include: The control device of the energy storage converter according to claim 8; or The readable storage medium as claimed in claim 9.

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