High-voltage direct-hanging energy storage system control method and device, electronic equipment and storage medium
By dynamically switching the control mode of the high-voltage direct-connected energy storage system, and switching the reference value of the inner loop dq axis of the current according to the short-circuit ratio, combined with the PI circuit and phase compensation circuit, the stability and economic problems of the high-voltage direct-connected energy storage system under weak power grid conditions are solved, and stable control in complex power grid environments is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2026-03-17
AI Technical Summary
High-voltage direct-connected energy storage systems lack stability under weak power grids, failing to balance economic efficiency and stability. Traditional control modes exhibit instability and inability to provide voltage and frequency support in complex power grid environments.
By obtaining the short-circuit ratio at the grid connection point, the control mode of the high-voltage direct-connected energy storage system is dynamically switched. The system adopts grid-following control or grid-connection control, and switches the reference value of the dq axis of the inner current loop according to the threshold of the short-circuit ratio. Combined with the control strategies of PI link, phase compensation link and virtual impedance link, a smooth transition is achieved.
When the short-circuit ratio at the grid connection point is high, control costs are reduced; when the short-circuit ratio is low, the active support capability for the power grid is improved, balancing economy and stability, and avoiding current surges and power spikes during control mode switching.
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Figure CN121689079A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of high-voltage direct-hanging energy storage systems, and particularly relates to a high-voltage direct-hanging energy storage system control method and device, electronic equipment and a storage medium. BACKGROUND
[0002] The control mode of a high-voltage direct-hanging energy storage system has two controls, namely a grid-following type and a grid-forming type. The grid-following type control has good economic benefits and is widely used. However, with the continuous increase of new energy penetration, the impedance fluctuation of the local power grid is more significant, the power grid shows alternating characteristics of strength and weakness, and the characteristics of the power grid become increasingly complex. The traditional grid-following type control has insufficient stability under a weak power grid and cannot provide voltage and frequency support for the power grid. The grid-forming type control presents a voltage source characteristic and can provide active support for the power grid and autonomously respond to changes in the voltage and frequency of the power grid. Therefore, how to combine the two control modes to make the high-voltage direct-hanging energy storage system consider both economic efficiency and stability is a research hotspot. SUMMARY
[0003] The present application provides a high-voltage direct-hanging energy storage system control method and device, electronic equipment and a storage medium, which solves the technical problem of how to make the high-voltage direct-hanging energy storage system consider both economic efficiency and stability.
[0004] The present application provides a high-voltage direct-hanging energy storage system control method, which comprises the following steps: obtaining a short-circuit ratio of a grid-connected point of a high-voltage direct-hanging energy storage system; if the short-circuit ratio is greater than a preset threshold, taking an output current of a grid-following control network of the high-voltage direct-hanging energy storage system as a reference value of a current inner loop dq axis; if the short-circuit ratio is less than or equal to the preset threshold, taking an output current of a grid-forming control network of the high-voltage direct-hanging energy storage system as the reference value of the current inner loop dq axis.
[0005] Optionally, the step of obtaining the short-circuit ratio of the grid-connected point of the high-voltage direct-hanging energy storage system comprises the following steps: obtaining a first voltage and a first current of the grid-connected point before injecting a disturbance current into the grid-connected point; obtaining a second voltage and a second current of the grid-connected point after injecting the disturbance current into the grid-connected point; determining the short-circuit ratio according to the first voltage, the first current, the second voltage and the second current.
[0006] Optionally, the step of taking the output current of the grid-following control network of the high-voltage direct-hanging energy storage system as the reference value of the current inner loop dq axis comprises the following steps: Latch the output current of the grid-forming control network, and superimpose the output current of the grid-forming control network and the output of the PI link in the grid-following control network to obtain the output current of the grid-following control network. Take the output current of the grid-following control network as the reference value of the current inner loop dq axis.
[0007] Optionally, after the short-circuit ratio of the grid-connected point of the high-voltage direct-hanging energy storage system is obtained, the method further includes: If the short-circuit ratio is greater than a preset threshold, the output of the PI link and / or the output of the virtual impedance link of the reactive voltage ring in the grid-forming control network is set to 0.
[0008] Optionally, after the short-circuit ratio of the grid-connected point of the high-voltage direct-hanging energy storage system is obtained, the method further includes: If the short-circuit ratio is greater than a preset threshold, the phase compensation link in the grid-forming control network is accessed.
[0009] Optionally, the output current of the grid-forming control network of the high-voltage direct-hanging energy storage system is taken as the reference value of the current inner loop dq axis, including: Latch the output current of the grid-following control network, and superimpose the output current of the grid-following control network and the output of the virtual impedance link in the grid-forming control network to obtain a superimposed current; Generate the output current of the grid-forming control network according to the superimposed current, and take the output current of the grid-forming control network as the reference value of the current inner loop dq axis.
[0010] Optionally, after the short-circuit ratio of the grid-connected point of the high-voltage direct-hanging energy storage system is obtained, the method further includes: If the short-circuit ratio is less than or equal to a preset threshold, the output of the PI link in the grid-following control network and the phase compensation link in the grid-forming control network is set to 0.
[0011] The application also provides a high-voltage direct-hanging energy storage system control device, including: An acquisition module is configured to acquire a short-circuit ratio of a grid-connected point of a high-voltage direct-hanging energy storage system. A control module is configured to, if the short-circuit ratio is greater than a preset threshold, take the output current of a grid-following control network of the high-voltage direct-hanging energy storage system as a reference value of a current inner loop dq axis. The control module is further configured to, if the short-circuit ratio is less than or equal to a preset threshold, take the output current of a grid-forming control network of the high-voltage direct-hanging energy storage system as the reference value of the current inner loop dq axis.
[0012] The application further provides an electronic device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any one of the high-voltage direct-hanging energy storage system control methods.
[0013] The application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the steps of any one of the high-voltage direct-hanging energy storage system control methods.
[0014] The one or more technical solutions provided by the application have at least the following technical effects or advantages: The application adopts the grid-following mode to control the high-voltage direct-hanging energy storage system when the short-circuit of the grid connection point is large, so that the control cost of the energy storage power station can be reduced; the grid-forming mode is adopted to control the high-voltage direct-hanging energy storage system when the short-circuit of the grid connection point is small, so that the active support capability of the energy storage power station to the power grid can be improved, thereby balancing the economy and stability of the high-voltage direct-hanging energy storage system. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0016] Figure 1 The flow chart of the high-voltage direct-hanging energy storage system control method in the embodiment of the application; Figure 2 The structure schematic diagram of the grid-following control network in the embodiment of the application; Figure 3 The structure schematic diagram of the grid-forming control network in the embodiment of the application; Figure 4 The structure schematic diagram of the current inner loop in the embodiment of the application; Figure 5 The schematic diagram of the high-voltage direct-hanging energy storage system control device in the embodiment of the application. DETAILED DESCRIPTION
[0017] The embodiment of the application provides the high-voltage direct-hanging energy storage system control method, device, electronic device and storage medium, and solves the technical problem of how to improve the control precision of the high-voltage direct-hanging energy storage system.
[0018] In order to better understand the technical solutions of the application, the technical solutions of the application will be described in detail below in combination with the drawings in the specification and specific implementation manners.
[0019] As Figure 1As shown, the high-voltage direct-hanging energy storage system control method of the application includes but is not limited to: Step S1, obtaining the short-circuit ratio of the grid-connected point of the high-voltage direct-hanging energy storage system; Step S2, if the short-circuit ratio is greater than a preset threshold, taking the output current of the grid-following control network of the high-voltage direct-hanging energy storage system as the reference value of the current inner loop dq axis; Step S3, if the short-circuit ratio is less than or equal to the preset threshold, taking the output current of the grid-forming control network of the high-voltage direct-hanging energy storage system as the reference value of the current inner loop dq axis.
[0020] As shown, Figure 2 P ref , P respectively are active power reference value, active power actual value, Q ref , Q respectively are reactive power reference value, reactive power actual value, the output current of the grid-following control network includes I d_PQ , I q_PQ . The principle of the grid-following control network is: calculating P ref -P, PI control is performed on (P ref -P) through a PI (proportional integral) link to obtain the output of the PI link; calculating Q ref -Q, PI control is performed on (Q ref -Q) through a PI (proportional integral) link to obtain the output of the PI link.
[0021] As shown, Figure 3 the grid-forming control network includes a phase compensation link, an active frequency ring, a reactive voltage ring, a virtual impedance link, and a ring limiter, etc.
[0022] In the phase compensation link, V gabc is the grid-side grid voltage, q VSG is the grid-forming control phase, abc / dq is the coordinate transformation of the three-phase stationary coordinate system-two-phase rotating coordinate system, U gq is the d-axis component after dq transformation of the grid voltage; q VSG dq decomposition is performed on V gabc to obtain U gq , and U gq is PI controlled to obtain the phase compensation value. In the active frequency ring, D is the damping coefficient, J is the moment of inertia, 1 / s represents the integral operation in the Laplace domain, w N is the rated angular frequency. The output of the active frequency ring is superimposed with the phase compensation value output by the phase compensation link, and then q VSG is compensated.
[0023] In the reactive voltage ring, V pcc , V N are the grid-side voltage effective value and the grid-side voltage rated value respectively, Dq is the reactive-voltage droop coefficient, Eref E VSG These are the grid-side reference voltage and the internal potential of the self-synchronizing voltage source, respectively.
[0024] V abc_pcs V is the inverter output voltage, dq / abc is the coordinate transformation from a two-phase rotating coordinate system to a three-phase stationary coordinate system. d_pcs V is the output voltage of the inverter on the d-axis. q_pcs This represents the output voltage of the inverter on the q-axis.
[0025] In the virtual impedance circuit, Rv and Lv represent the virtual resistance and virtual inductance, respectively. The output current of the network control system includes I... d_VSG I q_VSG .
[0026] like Figure 4 As shown, in the inner current loop, q PLL To control the phase of the network, I abc_pcs I is the inverter output current. d_pcs I is the output current of the inverter on the d-axis. q_pcs V is the output current of the inverter on the q-axis. d_feed V is the d-axis voltage feedforward component. q_feed PR represents the q-axis voltage feedforward component and is a proportional resonant control.
[0027] The preset threshold of the present invention can be 3. In step S2, the... Figure 1 , 2 Set the control mode in step 3 to 0, I d_PQ As a reference value for the d-axis of the inner current loop, I q_PQ Using the q-axis value as a reference for the inner current loop allows the output current of the grid-connected control network to be used as the reference value for the dq-axis of the inner current loop. Simultaneously, the inner current loop is connected to the grid-connected control phase q. PLL .
[0028] In step S3, Figure 1 , 2 In step 3, the control mode is set to 1, I d_VSG As a reference value for the d-axis of the inner current loop, I q_VSG Using the q-axis value as a reference value for the inner current loop, the output current of the network control network can be used as the reference value for the dq-axis of the inner current loop. Simultaneously, the inner current loop is connected to the network control phase q. VSG .
[0029] As can be seen from the above, the high-voltage direct-connected energy storage system control method of the present invention adopts grid-following mode to control the high-voltage direct-connected energy storage system when the short-circuit ratio at the grid connection point is large, which can reduce the control cost of the energy storage power station; when the short-circuit ratio at the grid connection point is small, it adopts grid-building mode to control the high-voltage direct-connected energy storage system, which can improve the active support capability of the energy storage power station to the grid, thereby taking into account both the economy and stability of the high-voltage direct-connected energy storage system.
[0030] In one embodiment, step S1 may specifically include: Obtain the first voltage and first current at the grid connection point before injecting disturbance current into it; After injecting a disturbance current into the grid connection point, the second voltage and second current of the grid connection point are obtained; The short-circuit ratio is determined based on the first voltage, the first current, the second voltage, and the second current.
[0031] The formula for calculating the short-circuit ratio includes: ; ; U th I th These are the second voltage and the second current, U. th0 I th0 Z represents the first voltage and the first current, respectively. m Here, SCR represents the impedance at the grid connection point.
[0032] In one embodiment, step S2, using the output current of the grid-connected control network of the high-voltage direct-connected energy storage system as the reference value of the dq axis of the current inner loop, may specifically include: The output current of the network control network is latched and superimposed with the output of the PI element in the grid control network to obtain the output current of the grid control network. The output current of the control network is used as the reference value for the dq axis of the inner current loop.
[0033] like Figure 2 , Figure 3 and Figure 4 As shown, latch Figure 3 I d_VSG and I q_VSG , will I d_VSG and I q_VSG The output current I of the grid control network is obtained by superimposing the output of the PI element in the grid control network. d_PQ and I q_PQ As a reference value for the dq axis of the inner current loop, it can be used to provide I d_PQ and I q_PQAn initial value is given to avoid too large fluctuation of the reference value of the dq axis of the current inner loop when switching from the grid-forming mode to the grid-following mode, so as to avoid large impact of system power and current mutation, and realize smooth transition from the grid-forming mode to the grid-following mode.
[0034] In one embodiment, after step S1, the high-voltage direct-hanging energy storage system control method of the application can further include: If the short-circuit ratio is greater than the preset threshold, the output of the PI link and / or the virtual impedance link of the reactive voltage ring in the grid-forming control network is set to 0.
[0035] When the short-circuit ratio is greater than the preset threshold, the system works in the grid-following mode, and the grid-forming control network is in an open-loop running state. If the grid-forming control network is continuously allowed to adjust autonomously, there is a risk of control instability. Figure 3 As shown in the figure, the application sets the output of the PI link and the virtual impedance link of the reactive voltage ring in the grid-forming control network to 0 in the grid-following mode, which can prepare for the control mode switching and improve the stability of system control.
[0036] In one embodiment, after step S1, the high-voltage direct-hanging energy storage system control method of the application can further include: If the short-circuit ratio is greater than the preset threshold, the phase compensation link in the grid-forming control network is accessed.
[0037] As shown in the figure, the control mode of the phase compensation link is set to 0 to access the phase compensation link. When the short-circuit ratio is greater than the preset threshold, the system works in the grid-following mode. Figure 3 When q PLL is greater than q VSG , the phase compensation value obtained by PI control is greater than 0, which can increase q VSG , so that q VSG and q PLL are closer; when q PLL is less than q VSG , the phase compensation value obtained by PI control is less than 0, which can reduce q VSG , so that q VSG and q PLL are closer; when q PLL is equal to q VSG , the phase compensation value obtained by PI control is equal to 0; in this way, the phase angle difference between q PLL and q VSG can be reduced, and current impact phenomenon can be avoided.
[0038] In one embodiment, in step S3, the output current of the grid-forming control network of the high-voltage direct-hanging energy storage system is taken as the reference value of the current inner loop dq axis, which can specifically include: The latch controls the output current of the follow network control network and superimposes the output current of the follow network control network and the output of the virtual impedance link in the network construction control network to obtain a superimposed current; The output current of the network construction control network is generated according to the superimposed current, and the output current of the network construction control network is taken as the reference value of the current inner loop dq axis.
[0039] As shown in Figure 2 , Figure 3 and Figure 4 , the latch controls Figure 2 I d_PQ and I q_PQ , superimposes I d_PQ and I q_PQ with the output of the virtual impedance link in the network construction control network respectively, and takes the output currents I d_VSG and I q_VSG of the network construction control network as the reference values of the current inner loop dq axis, so that an initial value can be given to I d_VSG and I q_VSG , to avoid excessive fluctuation of the reference values of the current inner loop dq axis when switching from the follow network mode to the network construction mode, to avoid large impact on system power and current mutation, and to realize smooth transition from the follow network mode to the network construction mode.
[0040] In one embodiment, after step S1, the high-voltage direct-hanging energy storage system control method of the application can further include: If the short-circuit ratio is less than or equal to the preset threshold, the outputs of the PI link in the follow network control network and the phase compensation link in the network construction control network are set to 0.
[0041] When the short-circuit ratio is less than or equal to the preset threshold, the system works in the network construction mode, and the follow network control network is in an open-loop operating state. If the PI control of the follow network control network is continuously adjusted autonomously, there is a risk of control instability. As shown in Figure 2 , the application sets the output of the PI link in the follow network control network to 0 in the network construction mode, which can prepare for the control mode switching and improve the stability of the system control.
[0042] As shown in Figure 5 , the high-voltage direct-hanging energy storage system control device provided by the application includes: The acquisition module is configured to acquire the short-circuit ratio of the grid connection point of the high-voltage direct-hanging energy storage system; The control module is configured to, if the short-circuit ratio is greater than the preset threshold, take the output current of the follow network control network of the high-voltage direct-hanging energy storage system as the reference value of the current inner loop dq axis; The control module is further configured to, if the short-circuit ratio is less than or equal to the preset threshold, take the output current of the network construction control network of the high-voltage direct-hanging energy storage system as the reference value of the current inner loop dq axis.
[0043] In one embodiment, the acquisition module can be configured to: acquire a first voltage and a first current of the grid-connected point before injecting the disturbance current into the grid-connected point; acquire a second voltage and a second current of the grid-connected point after injecting the disturbance current into the grid-connected point; determine the short-circuit ratio according to the first voltage, the first current, the second voltage and the second current.
[0044] In one embodiment, the control module can be configured to: latch the output current of the grid-forming control network, and superimpose the output current of the grid-forming control network and the output of the PI link in the grid-following control network to obtain the output current of the grid-following control network; use the output current of the grid-following control network as the reference value of the current inner loop dq axis.
[0045] In one embodiment, the control module can be configured to: if the short-circuit ratio is greater than a preset threshold, set the output of the PI link and / or the output of the virtual impedance link of the reactive voltage loop in the grid-forming control network to 0.
[0046] In one embodiment, the control module can be configured to: if the short-circuit ratio is greater than a preset threshold, access the phase compensation link in the grid-forming control network.
[0047] In one embodiment, the control module can be configured to: latch the output current of the grid-following control network, and superimpose the output current of the grid-following control network and the output of the virtual impedance link in the grid-forming control network to obtain the superimposed current; generate the output current of the grid-forming control network according to the superimposed current, and use the output current of the grid-forming control network as the reference value of the current inner loop dq axis.
[0048] In one embodiment, the control module can be configured to: if the short-circuit ratio is less than or equal to a preset threshold, set the output of the PI link in the grid-following control network and the output of the phase compensation link in the grid-forming control network to 0.
[0049] Based on the same inventive concept as the high-voltage direct-hanging energy storage system control method described above, the embodiments of the present application also provide an electronic device comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any one of the high-voltage direct-hanging energy storage system control methods described above.
[0050] Since the electronic device introduced in the embodiment of the present application is the electronic device used for implementing the high-voltage direct-hanging energy storage system control method in the embodiment of the present application, based on the high-voltage direct-hanging energy storage system control method introduced in the embodiment of the present application, the person skilled in the art can understand the specific implementation manner of the electronic device of the embodiment of the present application and various forms of changes, so how the electronic device implements the method in the embodiment of the present application will not be introduced in detail here. As long as the person skilled in the art implements the electronic device used for implementing the high-voltage direct-hanging energy storage system control method in the embodiment of the present application, it belongs to the scope of protection of the present application.
[0051] Based on the same inventive concept as the high-voltage direct-hanging energy storage system control method, the present application also provides a computer readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the steps of any one of the high-voltage direct-hanging energy storage system control methods.
[0052] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
[0053] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more flows and / or blocks.
[0054] These computer program instructions can also be stored in a computer readable memory that can guide the computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer readable memory produce a product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more flows and / or blocks.
[0055] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.
[0056] While the preferred embodiments of the application have been described, it should be apparent that a little thought and experimentation can lead to the development of other techniques and procedures that are widely equivalent to those described but which fall within the broad scope of the application. Therefore, the following claims are intended to include all such modifications and variations as fall within the scope of the application.
[0057] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.
Claims
1. A high-voltage direct-mount energy storage system control method, characterized by, The method comprises the following steps: acquiring a short-circuit ratio of a grid-connected point of a high-voltage directly-connected energy storage system; if the short-circuit ratio is greater than a preset threshold, taking an output current of a grid-following control network of the high-voltage directly-connected energy storage system as a reference value of a current inner loop dq axis; if the short-circuit ratio is less than or equal to the preset threshold, taking an output current of a grid-forming control network of the high-voltage directly-connected energy storage system as the reference value of the current inner loop dq axis.
2. The control method of the high-voltage direct-adhesion energy storage system according to claim 1, wherein, The acquiring of the short-circuit ratio of the grid-connected point of the high-voltage directly-connected energy storage system comprises the following steps: acquiring a first voltage and a first current of the grid-connected point before injecting a disturbance current into the grid-connected point; after injecting the disturbance current into the grid-connected point, acquiring a second voltage and a second current of the grid-connected point; determining the short-circuit ratio according to the first voltage, the first current, the second voltage and the second current.
3. The control method of the high voltage direct mount energy storage system according to claim 1, wherein, The taking of the output current of the grid-following control network of the high-voltage directly-connected energy storage system as the reference value of the current inner loop dq axis comprises the following steps: latching the output current of the grid-forming control network, and superimposing the output current of the grid-forming control network and an output of a PI link in the grid-following control network to obtain an output current of the grid-following control network; taking the output current of the grid-following control network as the reference value of the current inner loop dq axis.
4. The control method of the high voltage direct mount energy storage system according to claim 1, wherein, After the acquiring of the short-circuit ratio of the grid-connected point of the high-voltage directly-connected energy storage system, the method further comprises the following steps: if the short-circuit ratio is greater than the preset threshold, setting an output of a PI link and / or a virtual impedance link of a reactive voltage loop in the grid-forming control network to 0.
5. The control method of the high voltage direct mount energy storage system according to claim 1, wherein, After the acquiring of the short-circuit ratio of the grid-connected point of the high-voltage directly-connected energy storage system, the method further comprises the following steps: if the short-circuit ratio is greater than the preset threshold, connecting a phase compensation link in the grid-forming control network.
6. The control method of the high voltage direct mount energy storage system according to claim 1, wherein, The taking of the output current of the grid-forming control network of the high-voltage directly-connected energy storage system as the reference value of the current inner loop dq axis comprises the following steps: latching the output current of the grid-following control network, and superimposing the output current of the grid-following control network and an output of a virtual impedance link in the grid-forming control network to obtain a superimposed current; generating the output current of the grid-forming control network according to the superimposed current, and taking the output current of the grid-forming control network as the reference value of the current inner loop dq axis.
7. The control method of the high voltage direct mount energy storage system according to claim 1, wherein, After the acquiring of the short-circuit ratio of the grid-connected point of the high-voltage directly-connected energy storage system, the method further comprises the following steps: if the short-circuit ratio is less than or equal to the preset threshold, setting outputs of a PI link in the grid-following control network and a phase compensation link in the grid-forming control network to 0.
8. A high voltage direct mount energy storage system control device, characterized by, The method comprises the following steps: an acquiring module, configured to acquire a short-circuit ratio of a grid-connected point of a high-voltage directly-connected energy storage system; a control module, configured to, if the short-circuit ratio is greater than a preset threshold, take an output current of a grid-following control network of the high-voltage directly-connected energy storage system as a reference value of a current inner loop dq axis; the control module is further configured to, if the short-circuit ratio is less than or equal to the preset threshold, take an output current of a grid-forming control network of the high-voltage directly-connected energy storage system as the reference value of the current inner loop dq axis.
9. An electronic device, comprising: The computer program product comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to realize the steps of the method according to any one of claims 1-7.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, which is executed by a processor, implements the steps of the method as claimed in any one of claims 1 to 7.