High dynamic response control method and system for high-power energy storage system dc conversion device

Abstract

This invention discloses a high dynamic response control method and system for a DC-DC converter in a high-power energy storage system. It is applied to a dual-closed-loop control loop, which includes a Vnref DC output voltage compensation loop and a Vpref DC output voltage compensation loop connected in parallel. The method includes: determining whether the DC output voltage is within the steady-state error band; if so, the Vnref and Vpref DC output voltage compensation loops do not output, and the output of the outer loop of the dual-closed-loop control system is used as the reference value for the inner loop of the output current; if not, the output of either the Vnref or Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current. This invention enables rapid dynamic adjustment, eliminating the need to switch the PI parameters in steady state, thus not affecting system operation. It has wide applicability and requires no additional hardware sampling circuitry, resulting in good economic efficiency.

Description

Technical Field

[0001] This invention relates to the field of high-power energy storage technology, and in particular to a high dynamic response control method and system for a DC-DC converter in a high-power energy storage system. Background Technology

[0002] Green and low-carbon technological innovation is of paramount importance. Among these innovations, high-power energy storage systems have seen significant development because they achieve green transformation while simultaneously supporting economic development.

[0003] High-power energy storage systems consist of battery packs, cluster managers, grid-connected inverters, and local EMS. The cluster equalizer's controllable DC source employs an isolated structure, typically using a DAB / LLC topology to achieve balanced output for each battery group within the pack. The DC source output voltage must be capable of rapid recovery from load fluctuations; otherwise, circulating currents can damage the system. Loop control in isolated topologies often utilizes sampled digital control technology. However, digital control methods, due to their discrete sampling and control methods, are limited by delays caused by the digital control cycle, increasing the difficulty of achieving rapid DC output voltage response. Currently, dynamic DC output voltage adjustment uses fuzzy PID control algorithms. This method requires real-time sampling of the DC bus voltage and timely adjustment of proportional, integral, and derivative loop parameters (i.e., variable PID parameters). It requires numerous discrete sampling points and a large number of parameter combinations, making it prone to divergence. Switching PI parameters according to different operating conditions is difficult in software implementation, and the initial debugging process is complex, significantly increasing time costs and resulting in unsatisfactory dynamic performance.

[0004] Therefore, improvements to existing technologies are necessary.

[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Summary of the Invention

[0006] This invention provides a high dynamic response control method and system for DC-DC converters in high-power energy storage systems to overcome the shortcomings of existing technologies.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] In a first aspect, the present invention provides a high dynamic response control method for a DC-DC converter in a high-power energy storage system. The method is applied to a dual closed-loop control circuit consisting of an outer output voltage loop and an inner output current loop. The dual closed-loop control circuit includes a Vnref DC output voltage compensation loop and a Vpref DC output voltage compensation loop connected in parallel. The method comprises:

[0009] Determine whether the DC output voltage is within the steady-state error band;

[0010] If so, the Vnref DC output voltage compensation loop and the Vpref DC output voltage compensation loop will not output, and the output of the outer loop of the dual closed-loop control loop will be used as the reference value of the inner loop of the output current.

[0011] If not, the output of the Vnref DC output voltage compensation loop or the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop.

[0012] Furthermore, in the high dynamic response control method for the DC-DC converter of the high-power energy storage system, the step of superimposing the output of the Vnref DC output voltage compensation loop or the Vpref DC output voltage compensation loop onto the reference value of the inner loop of the output current of the dual closed-loop control loop includes:

[0013] When switching from a small load to a large load and the DC output voltage drops to the Vnref threshold, the Vnref DC output voltage compensation loop outputs, and the output of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop;

[0014] When switching from a large load to a small load and the DC output voltage rises to the Vpref threshold, the Vpref DC output voltage compensation loop outputs, and the output of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop.

[0015] Furthermore, in the high dynamic response control method for the DC-DC converter of the high-power energy storage system, before the step of determining whether the DC output voltage is within the steady-state error band, the method further includes:

[0016] Set the steady-state error band, Vnref threshold, and Vpref threshold.

[0017] Furthermore, in the high dynamic response control method for the DC-DC converter of the high-power energy storage system, the step of superimposing the output of the Vnref DC output voltage compensation loop onto the reference value of the inner loop of the output current of the dual closed-loop control loop includes:

[0018] The error value between the output and feedback voltage of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage.

[0019] Furthermore, in the high dynamic response control method for the DC-DC converter of the high-power energy storage system, the step of superimposing the output of the Vpref DC output voltage compensation loop onto the reference value of the inner loop of the output current of the dual closed-loop control loop includes:

[0020] The error value between the output and feedback voltage of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage.

[0021] In a second aspect, the present invention provides a high dynamic response control system for a DC-DC converter of a high-power energy storage system, the system comprising:

[0022] The judgment module is used to determine whether the DC output voltage is within the steady-state error band.

[0023] The execution module is configured to, if the DC output voltage is within the steady-state error band, then the Vnref DC output voltage compensation loop and the Vpref DC output voltage compensation loop will not output, and the output of the outer loop of the dual closed-loop control loop will be used as the reference value of the inner loop of the output current; if the DC output voltage is not within the steady-state error band, then the output of the Vnref DC output voltage compensation loop or the Vpref DC output voltage compensation loop will be superimposed on the reference value of the inner loop of the dual closed-loop control loop of the output current.

[0024] Furthermore, in the high dynamic response control system of the DC-DC converter of the high-power energy storage system, the execution module is specifically used for:

[0025] When switching from a small load to a large load and the DC output voltage drops to the Vnref threshold, the Vnref DC output voltage compensation loop outputs, and the output of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop;

[0026] When switching from a large load to a small load and the DC output voltage rises to the Vpref threshold, the Vpref DC output voltage compensation loop outputs, and the output of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop.

[0027] Furthermore, in the high dynamic response control system of the DC-DC converter of the high-power energy storage system, the system further includes a setting module for:

[0028] Before determining whether the DC output voltage is within the steady-state error band, the steady-state error band, Vnref threshold, and Vpref threshold are set.

[0029] Furthermore, in the high dynamic response control system of the DC-DC converter of the high-power energy storage system, the step of superimposing the output of the Vnref DC output voltage compensation loop onto the reference value of the inner loop of the output current of the dual closed-loop control loop, performed by the execution module, specifically includes:

[0030] The error value between the output and feedback voltage of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage.

[0031] Furthermore, in the high dynamic response control system of the DC-DC converter of the high-power energy storage system, the step of superimposing the output of the Vpref DC output voltage compensation loop onto the reference value of the inner loop of the output current of the dual closed-loop control loop, performed by the execution module, specifically includes:

[0032] The error value between the output and feedback voltage of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] This invention provides a high dynamic response control method and system for a DC-DC converter in a high-power energy storage system. By adding two DC output voltage compensation loops to the original dual closed-loop control loop, and superimposing the output of one of the compensation loops onto the reference value of the inner loop of the output current when compensation is required, rapid dynamic adjustment can be achieved. This not only eliminates the need to switch the PI parameters in steady state, thus not affecting the operation of the system in steady state, but also has wide applicability. Furthermore, it requires no additional hardware sampling circuit, resulting in almost no increase in hardware cost and good economic efficiency. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a flowchart illustrating a high dynamic response control method for a DC-DC converter in a high-power energy storage system, provided in Embodiment 1 of the present invention.

[0037] Figure 2 This is a schematic diagram of the full-bridge LLC topology mentioned in Embodiment 1 of the present invention;

[0038] Figure 3This is a schematic diagram of the simplified system model mentioned in Embodiment 1 of the present invention;

[0039] Figure 4 This is a schematic diagram of the control loop of the system mentioned in Embodiment 1 of the present invention;

[0040] Figure 5 This is a schematic diagram of adding two DC output voltage compensation loops to the closed-loop control loop mentioned in Embodiment 1 of the present invention;

[0041] Figure 6 This is a waveform diagram of the target voltage reference value of the compensation loop mentioned in Embodiment 1 of the present invention;

[0042] Figure 7 This is a schematic diagram of the experimental results of the conventional control method mentioned in Embodiment 1 of the present invention;

[0043] Figure 8 This is a schematic diagram of the experimental results of a high dynamic response control method for a DC-DC converter in a high-power energy storage system mentioned in Embodiment 1 of the present invention;

[0044] Figure 9 This is a functional module schematic diagram of a high dynamic response control system for a DC-DC converter in a high-power energy storage system provided in Embodiment 2 of the present invention. Detailed Implementation

[0045] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0046] In the description of this invention, it should be understood that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present simultaneously. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be an intermediate component present simultaneously.

[0047] Furthermore, terms such as “long,” “short,” “inner,” and “outer” indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the purpose of describing the present invention and are not intended to indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientational configuration. Therefore, they should not be construed as limitations of the present invention.

[0048] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0049] Example 1

[0050] In view of the shortcomings of existing high-power energy storage technologies, the applicant, based on years of practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theoretical principles, has actively conducted research and innovation in order to create a technology that can solve the shortcomings of existing technologies and make high-power energy storage technology more practical. After continuous research, design, and repeated prototype production and improvement, this invention with real practical value has finally been created.

[0051] Please refer to Figure 1 This is a flowchart illustrating a high dynamic response control method for a DC-DC converter in a high-power energy storage system according to Embodiment 1 of the present invention. The method is applied to a dual closed-loop control circuit consisting of an outer output voltage loop and an inner output current loop. The dual closed-loop control circuit includes a Vnref DC output voltage compensation loop and a Vpref DC output voltage compensation loop connected in parallel. The method specifically includes the following steps:

[0052] S101. Determine whether the DC output voltage is within the steady-state error band; if yes, proceed to step S102; if no, proceed to step S103.

[0053] S102, The Vnref DC output voltage compensation loop and the Vpref DC output voltage compensation loop do not output, and the output of the outer loop of the dual closed-loop control loop is used as the reference value of the inner loop of the output current.

[0054] S103. The output of the Vnref DC output voltage compensation loop or the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop.

[0055] In this embodiment, step S103 can be further refined to include the following steps:

[0056] When switching from a small load to a large load and the DC output voltage drops to the Vnref threshold, the Vnref DC output voltage compensation loop outputs, and the output of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop;

[0057] When switching from a large load to a small load and the DC output voltage rises to the Vpref threshold, the Vpref DC output voltage compensation loop outputs, and the output of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop.

[0058] The high dynamic response control method for a DC-DC converter in a high-power energy storage system provided in Embodiment 1 of this invention is applicable to high-power, high-voltage energy storage, HVDC DC transmission equipment control applications, as well as low-power vehicle-mounted OBCs, server power supplies, data center DC power supply systems, etc. This invention is described using a full-bridge LLC topology. Figure 2 The topological structure under study. Figure 2 In the diagram, Lr: resonant inductance, Lm: magnetizing inductance, Cr: resonant capacitor, T: transformer, S1-S4 are primary-side driven, S5-S8 are secondary-side driven. R: equivalent load R = Vout / Iout, Iout: output current. Assuming the transformer turns ratio is n, the simplified system model is as follows: Figure 3 As shown, in Figure 3 In the diagram, Rac is the equivalent impedance of the output impedance to the primary side of the LLC, Rac = n^2 * R, Vo is the output voltage of the primary side of the LLC, Vo = n * Vout, Io is the equivalent current of the output load to the primary side of the LLC, Io = Iout / n. Vin is the equivalent voltage of the primary side of the LLC. The control loop of the system is then as follows: Figure 4 As shown. In Figure 4 In the middle, Z1: Z2:

[0059] When the load suddenly increases, the secondary impedance decreases rapidly, which in turn causes the equivalent primary impedance to decrease rapidly. Consequently, the primary output impedance of the converter and the equivalent impedance of the magnetizing inductor decrease rapidly. Since the switching frequency of the LLC cannot change abruptly, the primary output voltage Zout of the LLC drops rapidly. Due to the limitations of loop bandwidth and steady-state PI parameters, Vout requires a certain adjustment time to reach the target reference voltage, causing the output voltage to drop. Traditional control methods typically employ switching large PI parameters when dynamic adjustments occur, while simultaneously requiring the determination of dynamic system responses.

[0060] This invention proposes a high dynamic response control method for a DC-DC converter in a high-power energy storage system. This method adds two DC output voltage compensation loops to the original dual-closed-loop control loop; specifically, the dual-closed-loop control loop includes a Vnref DC output voltage compensation loop and a Vpref DC output voltage compensation loop connected in parallel. Figure 5 As shown. Figure 6 Waveform diagram of the target voltage reference value for the compensation loop.

[0061] like Figure 6As shown, the DC voltage drop amplitude must be greater than Vripple for the compensation circuit to compensate and ensure that the dynamic response is not falsely triggered during steady-state operation. This invention adopts the concept of steady-state error band Verror, considering a certain margin, and uses 1.2 times the ripple voltage as the voltage amplitude to trigger dynamic adjustment. The Vnref threshold can be set to 0.75*Vref, and the Vpref threshold can be set to 1.25*Vref.

[0062] It should be noted that when the DC output voltage is within the steady-state error band, the two newly added compensation loops are inactive. Only the output of the outer loop of the output voltage serves as the reference value for the inner loop of the output current. When switching from a small load to a large load, and the DC output voltage drops to Vnref, the compensation loop of Vnref begins to function. The error value between Vnref and the feedback voltage is processed by a PI compensation stage, and the output is superimposed on the reference value of the output current, improving the system's dynamic adjustment capability. At this time, the limiting value of the Vnref output compensation loop is [0, Un]. When switching from a large load to a small load, and the DC output voltage rises to the Vpref threshold, the compensation loop of Vpref begins to function. The error value between Vnref and the feedback voltage is processed by a PI compensation stage, and the output is superimposed on the reference value of the inductor current, resulting in the output voltage limiting value of Vpref being [-Up, 0]. That is, the compensation loop of Vnref has positive compensation capability when the reference value is [-Up, 0]. The compensation loop of Vpref has negative compensation capability when the reference value is [-Up, 0].

[0063] In this embodiment, before step S101, the method further includes:

[0064] Set the steady-state error band, Vnref threshold, and Vpref threshold.

[0065] To better illustrate the feasibility of the high dynamic control method for DC voltage in high-power energy storage systems, the present invention conducted the following experimental verification: The following shows the dynamic adjustment performance of the control method of the present invention compared with that of the traditional control method (switching PI parameters) when the DC-DC converter of the energy storage system switches from 25% load to 50% load. Figure 7 This diagram illustrates the experimental results of the traditional control method. During dynamic operation, the output voltage regulation capability is measured, with CH4 representing the output voltage value. Extensive experimental verification was conducted on both control methods. Based on the results, the optimal dynamic adjustment time for the traditional control method on this platform is 640µs. The experimental results of the control method proposed in this invention are as follows: Figure 8 As shown, the dynamic adjustment time is 450us, which is about 200us faster than the traditional control strategy.

[0066] The above experiments show that the control method proposed in this invention can optimize the dynamic adjustment time by 200µs compared with the traditional control method, effectively improve the circulating current of the energy storage system, and increase the battery life.

[0067] This invention provides a high dynamic response control method for a DC-DC converter in a high-power energy storage system. By adding two DC output voltage compensation loops to the original dual closed-loop control loop, and superimposing the output of one of the compensation loops onto the reference value of the inner loop of the output current when compensation is required, rapid dynamic adjustment can be achieved. This method not only eliminates the need to switch the PI parameters in steady state, thus not affecting the operation of the system in steady state, but also has wide applicability. Furthermore, it requires no additional hardware sampling circuit, resulting in almost no increase in hardware cost and good economic efficiency.

[0068] Example 2

[0069] Please refer to Figure 9 Embodiment 2 of the present invention provides a high dynamic response control system for a DC-DC converter of a high-power energy storage system. The system can be implemented by software and / or hardware, and the system includes:

[0070] The judgment module 201 is used to determine whether the DC output voltage is within the steady-state error band;

[0071] The execution module 202 is configured to, if the DC output voltage is within the steady-state error band, then the Vnref DC output voltage compensation loop and the Vpref DC output voltage compensation loop will not output, and the output of the outer loop of the dual closed-loop control loop will be used as the reference value of the inner loop of the output current; if the DC output voltage is not within the steady-state error band, then the output of the Vnref DC output voltage compensation loop or the Vpref DC output voltage compensation loop will be superimposed on the reference value of the inner loop of the dual closed-loop control loop of the output current.

[0072] Preferably, the execution module 202 is specifically used for:

[0073] When switching from a small load to a large load and the DC output voltage drops to the Vnref threshold, the Vnref DC output voltage compensation loop outputs, and the output of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop;

[0074] When switching from a large load to a small load and the DC output voltage rises to the Vpref threshold, the Vpref DC output voltage compensation loop outputs, and the output of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop.

[0075] Preferably, the system further includes a setting module for:

[0076] Before determining whether the DC output voltage is within the steady-state error band, the steady-state error band, Vnref threshold, and Vpref threshold are set.

[0077] Preferably, the step of superimposing the output of the Vnref DC output voltage compensation loop onto the reference value of the inner loop of the output current of the dual closed-loop control loop, performed by the execution module 202, specifically includes:

[0078] The error value between the output and feedback voltage of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage.

[0079] Preferably, the step of superimposing the output of the Vpref DC output voltage compensation loop onto the reference value of the inner loop of the dual closed-loop control loop, performed by the execution module 202, specifically includes:

[0080] The error value between the output and feedback voltage of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage.

[0081] The present invention provides a high dynamic response control system for a DC-DC converter in a high-power energy storage system. By adding two DC output voltage compensation loops to the original dual closed-loop control loop, and superimposing the output of one of the compensation loops onto the reference value of the inner loop of the output current when compensation is required, rapid dynamic adjustment can be achieved. This not only eliminates the need to switch the PI parameters in steady state, thus not affecting the operation of the system in steady state, but also has wide applicability. Furthermore, it eliminates the need for additional hardware sampling circuits, resulting in almost no increase in hardware costs and good economic efficiency.

[0082] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that this application is intended to encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0083] Furthermore, certain terms used in this application have been used to describe embodiments of this application. For example, "an embodiment," "an embodiment," and / or "some embodiments" mean that a particular feature, structure, or characteristic described in connection with that embodiment may be included in at least one embodiment of this application. Therefore, it is to be emphasized and understood that two or more references to "an embodiment" or "an embodiment" or "an alternative embodiment" in various parts of this specification do not necessarily refer to the same embodiment. Moreover, specific features, structures, or characteristics may be appropriately combined in one or more embodiments of this application.

[0084] It should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may extract some features as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when the content of each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0085] Each patent, patent application, publication of the patent application, and other materials such as articles, books, specifications, publications, documents, articles, etc., cited herein may be incorporated by reference. The entire contents used for all purposes, except for any history of prosecution documents associated with it, that may be inconsistent with or conflict with this document, or that may have a limiting effect on the widest extent of the claims, are now or hereafter associated with this document. For example, in the event of any inconsistency or conflict between the description, definition, and / or use of terms associated with any of the included materials and the terms, description, definition, and / or used in connection with this document, the terms used herein shall prevail.

[0086] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A high dynamic response control method for a DC-DC converter in a high-power energy storage system, characterized in that, The method is applied to a dual closed-loop control circuit consisting of an outer loop for output voltage and an inner loop for output current. The dual closed-loop control circuit includes a Vnref DC output voltage compensation loop and a Vpref DC output voltage compensation loop connected in parallel. The method comprises: Determine whether the DC output voltage is within the steady-state error band; If so, the Vnref DC output voltage compensation loop and the Vpref DC output voltage compensation loop will not output, and the output of the outer loop of the dual closed-loop control loop will be used as the reference value of the inner loop of the output current. If not, the output of the Vnref DC output voltage compensation loop or the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop; The step of superimposing the output of the Vnref DC output voltage compensation loop or the Vpref DC output voltage compensation loop onto the reference value of the inner loop of the output current of the dual closed-loop control loop includes: When switching from a small load to a large load and the DC output voltage drops to the Vnref threshold, the Vnref DC output voltage compensation loop outputs, and the output of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop; When switching from a large load to a small load and the DC output voltage rises to the Vpref threshold, the Vpref DC output voltage compensation loop outputs, and the output of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop. The step of superimposing the output of the Vnref DC output voltage compensation loop onto the reference value of the inner loop of the dual closed-loop control loop includes: The error value between the output and feedback voltage of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage. The step of superimposing the output of the Vpref DC output voltage compensation loop onto the reference value of the inner loop of the dual closed-loop control loop includes: The error value between the output and feedback voltage of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage.

2. The high dynamic response control method for a DC-DC converter in a high-power energy storage system according to claim 1, characterized in that, Before the step of determining whether the DC output voltage is within the steady-state error band, the method further includes: Set the steady-state error band, Vnref threshold, and Vpref threshold.

3. A high dynamic response control system for a DC-DC converter in a high-power energy storage system, characterized in that, The system includes; The judgment module is used to determine whether the DC output voltage is within the steady-state error band. The execution module is used to ensure that if the DC output voltage is in the steady-state error band, the Vnref DC output voltage compensation loop and the Vpref DC output voltage compensation loop will not output, and the output of the outer loop of the dual closed-loop control loop will be used as the reference value of the inner loop of the output current. If the DC output voltage is not in the steady-state error band, the output of the Vnref DC output voltage compensation loop or the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop. The execution module is specifically used for: When switching from a small load to a large load and the DC output voltage drops to the Vnref threshold, the Vnref DC output voltage compensation loop outputs, and the output of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop; When switching from a large load to a small load and the DC output voltage rises to the Vpref threshold, the Vpref DC output voltage compensation loop outputs, and the output of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop. The step of superimposing the output of the Vnref DC output voltage compensation loop onto the reference value of the inner loop of the dual closed-loop control loop, performed by the execution module, specifically includes: The error value between the output and feedback voltage of the Vnref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage. The step of superimposing the output of the Vpref DC output voltage compensation loop onto the reference value of the inner loop of the dual closed-loop control loop, performed by the execution module, specifically includes: The error value between the output and feedback voltage of the Vpref DC output voltage compensation loop is superimposed on the reference value of the inner loop of the output current of the dual closed-loop control loop after passing through the PI compensation stage.

4. The high dynamic response control system for the DC-DC converter of the high-power energy storage system according to claim 3, characterized in that, The system also includes a setting module for: Before determining whether the DC output voltage is within the steady-state error band, the steady-state error band, Vnref threshold, and Vpref threshold are set.

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