High-frequency circulating current suppression method and device

Abstract

The invention relates to the technical field of energy storage, and discloses a high-frequency circulating current suppression method and device, and the method comprises the steps: taking a current of an energy storage module as a feedback current; according to the capacitor voltage and the feedback current, the current of the DC-DC module is imaginary; and obtaining a control signal of the DC-DC module by using a current loop control mode based on the current of the imaginary DC-DC module and the current reference instruction. Through closed loop logic of feedback current collection-module current imaginary structure-current loop control, high-frequency circulation interference is eliminated from a control source, system resonance, efficiency reduction and hardware damage caused by circulation are avoided, stable operation of a parallel system is guaranteed, the method is adaptive to a multi-module parallel scene, and the reliability of system power expansion is improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, specifically to a method and apparatus for suppressing high-frequency circulating current. Background Technology

[0002] In energy storage systems, to improve power, enhance modularity and scalability, and reduce software control complexity, a common approach is to connect multiple DC-DC modules in parallel to a single high-capacity battery. However, this approach has drawbacks: there is inductive reactance between the battery and the DC-DC modules, and the output voltage sampling of each module differs, easily leading to an imbalance in the module current reference value under independent voltage closed-loop control. Current systems often only use low-frequency current sharing control in the outer voltage loop (setting the same current reference value to maintain low-frequency balance), but due to differences in the parameters of each DC-DC module (transformer, capacitor, etc.) and independent current closed-loop calculations, instantaneous output voltage inconsistencies still occur, triggering high-frequency circulating currents that allow energy to flow from high-voltage modules to low-voltage modules. After this circulating current is collected by the current sensor, it is misinterpreted by the closed-loop system as actual energy flow, amplifying the current difference and causing resonance between the line impedance and the battery capacitor, leading to decreased system efficiency or even hardware damage. Summary of the Invention

[0003] This invention provides a high-frequency circulating current suppression method and apparatus to solve the problem that existing control schemes cannot suppress high-frequency circulating currents in energy storage systems where multiple DC-DC modules are connected in parallel to a single large-capacity battery, leading to system instability, reduced efficiency, or even hardware damage.

[0004] In a first aspect, the present invention provides a high-frequency circulating current suppression method, applied to a system in which multiple DC-DC modules are connected in parallel to a single energy storage module. The DC sides of the multiple DC-DC modules are all connected in parallel to the same energy storage module, and a capacitor is connected in parallel to the DC side of each DC-DC module. For each DC-DC module, the method includes: using the current of the energy storage module as a feedback current; creating a fictitious current for the DC-DC module based on the capacitor voltage and the feedback current; and obtaining a control signal for the DC-DC module based on the fictitious current and a current reference command using a current loop control method.

[0005] This invention eliminates high-frequency circulating current interference from the control source through a closed-loop logic of feedback current acquisition, module current simulation, and current loop control. This avoids system resonance, efficiency degradation, and hardware damage caused by circulating current, ensuring stable operation of parallel systems. It is also suitable for multi-module parallel scenarios and improves the reliability of system power expansion.

[0006] In one alternative implementation, the process of creating a fictitious current for the DC-DC module includes: suppressing circulating current in the capacitor voltage to obtain a fictitious capacitor current; and using the sum of the feedback current and the fictitious capacitor current as the fictitious current of the DC-DC module.

[0007] This invention obtains the fictitious capacitor current plus the feedback current by suppressing circulating current, thereby accurately reconstructing the true output current of the DC-DC module. This completely eliminates the interference of high-frequency circulating current on the current reference, avoids the closed-loop system misjudging the circulating current as the real current, and further enhances the accuracy of circulating current suppression.

[0008] In one alternative implementation, the process of suppressing circulating current in the capacitor voltage includes: differentially adjusting the capacitor voltage to obtain an initial capacitor current; and filtering the initial capacitor current to obtain a fictitious capacitor current.

[0009] The differential adjustment of this invention can accurately extract the high-frequency circulating current information contained in the capacitor voltage (converting it into the initial capacitor current). Subsequent filtering can remove the high-frequency noise and switching ripple introduced by the differential stage, improve the purity of the capacitor current, provide reliable data for the subsequent virtual module current, and reduce control deviations caused by interference.

[0010] In one alternative implementation, the process of filtering the initial capacitor current includes: filtering the initial capacitor current using a first-order low-pass filter.

[0011] In one alternative implementation, the process of obtaining the control signal of the DC-DC module using a current loop control method includes: calculating the difference between the current reference command and the current of the hypothetical DC-DC module to obtain the current deviation; obtaining a modulation wave based on the current deviation using a proportional-integral circuit; and obtaining the control signal of the DC-DC module based on the modulation wave using a preset modulation method.

[0012] Secondly, the present invention provides a high-frequency circulating current suppression device, based on the high-frequency circulating current suppression method of the first aspect and any optional embodiment thereof. The device includes: a first module for using the current of the energy storage module as the feedback current; a second module for creating a fictitious current of the DC-DC module based on the capacitor voltage and the feedback current; and a third module for obtaining the control signal of the DC-DC module based on the fictitious current of the DC-DC module and the current reference command, using a current loop control method.

[0013] In one alternative implementation, the second module includes: a circulating current suppression unit for suppressing circulating current in the capacitor voltage to obtain a fictitious capacitor current; and a fictitious unit for using the sum of the feedback current and the fictitious capacitor current as the current of the fictitious DC-DC module.

[0014] Thirdly, the present invention provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the high-frequency circulating current suppression method of the first aspect or any corresponding embodiment described above.

[0015] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform the high-frequency circulating current suppression method of the first aspect or any corresponding embodiment thereof.

[0016] Fifthly, the present invention provides a computer program product, including computer instructions for causing a computer to execute the high-frequency circulating current suppression method of the first aspect or any corresponding embodiment described above. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the high-frequency circulating current in a DC-DC system; Figure 2 This is a control block diagram of existing circulation suppression methods; Figure 3 This is a schematic flowchart of a high-frequency circulating current suppression method according to an embodiment of the present invention; Figure 4 This is a control block diagram of a high-frequency circulating current suppression method according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0021] According to an embodiment of the present invention, a high-frequency circulating current suppression method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0022] Currently, most parallel DC-DC systems only consider low-frequency current sharing control methods based on the voltage outer loop. When multiple DC-DC modules are operating, current balance is typically ensured by setting the same current reference value for each module, thus guaranteeing low-frequency current balance. However, since each DC-DC module performs independent current closed-loop calculations, differences in parameters such as the DC-DC transformer, capacitor, and inductor can lead to momentary output voltage inconsistencies. This can cause energy flow from the high-voltage DC-DC module to the low-voltage DC-DC module, a phenomenon known as high-frequency circulating current. If this circulating current is collected by the DC-DC current sensor and fed back to the closed-loop control system, the closed-loop system may amplify this circulating current, causing resonance between the line impedance and battery capacitor. This can lead to decreased system efficiency and even overcurrent, potentially damaging the system hardware.

[0023] Specifically, when multiple DC-DC modules are connected in parallel to a single high-capacity battery, the high-frequency circulating current diagram of the DC-DC system is as follows: Figure 1 As shown, DC-DC1# and DC-DC2# represent two independent DC-DC modules, with current sampling denoted by Idc1# and Idc2# respectively. L represents the line impedance connecting the battery and the DC-DC module, I1# and I2# represent the high-frequency current output by the DC-DC module, and Ic1# and Ic2# represent the battery-side capacitor current of the two DC-DC modules. The red arrow indicates the direction of the DC-DC circulating current. Based on this current diagram, the expression for the sampling current can be derived as follows: (1) (2) Traditional current closed-loop systems, such as Figure 2 As shown, it mainly includes: error calculation, PI controller amplification, K PWM The output voltage and current feedback are processed. According to equations (1) and (2), it can be seen that circulating current is coupled into the sampling of Idc1# and Idc2#. If directly introduced into a traditional closed-loop control system, the closed-loop system will... 环流 The amplification of errors creates positive feedback, which intensifies the circulating current phenomenon in the system.

[0024] Therefore, according to Figure 1The current diagram shows that the output currents I1# and I2# of the DC-DC module are at the end of the capacitor Cbat, so they will not introduce circulating current. If I1# and I2# are simulated based on the sampling of Idc1# and Idc2# to perform closed-loop calculation, the circulating current effect can be solved.

[0025] That is, both the circulating current and the switching frequency are input with high-frequency current. For the input battery capacitor Cbat, the impedance of the Cbat branch is much smaller than the line impedance. Therefore, the high-frequency current will bypass the capacitor and be converted into the battery side capacitor voltage. Therefore, I1# and I2# can be simulated based on the sampling of the battery capacitor voltages Vbat1# and Vbat2# and Idc1# and Idc2#.

[0026] In summary, the expressions for the currents I1# and I2# output by the DC-DC module can be given by equations (3) and (4): (3) (4) Based on this, this embodiment provides a high-frequency circulating current suppression method. Figure 3 This is a flowchart of a high-frequency circulating current suppression method according to an embodiment of the present invention, such as... Figure 3 As shown, for each DC-DC module, the process includes the following steps: Step S1: Use the current of the energy storage module as the feedback current.

[0027] The "current of the energy storage module" here specifically refers to the sampling current on the connection line between the DC-DC module and the battery (corresponding to...). Figure 1 Idc1# and Idc2# represent the line current collected by the dedicated current sensors of each DC-DC module. The acquisition process must strictly adhere to the "no-filtering" principle, meaning no low-pass or high-pass filtering is introduced to ensure that all current information, including high-frequency circulating current components and load current components, is fully preserved in the sampled current. This is because subsequent steps need to filter out interference based on the "circulating current characteristics" in the current signal. Pre-filtering would result in the loss of high-frequency circulating current information, leading to a greater deviation between the subsequent "fictitious current" and the actual module output, thus losing the effect of suppressing circulating current.

[0028] The synchronization and accuracy of current sampling must be guaranteed: For multi-module parallel scenarios (such as two DC-DC modules), the acquisition times of the two sampling currents (Idc1#, Idc2#) must be strictly aligned (error controlled within microseconds) to avoid current comparison deviations caused by sampling timing differences; in addition, the accuracy of the current sensor must match the amplitude range of the high-frequency circulating current (usually from milliampere to ampere) to prevent signal distortion caused by insufficient sensor accuracy, which would affect the accuracy of subsequent control logic.

[0029] Step S2: Based on the capacitor voltage and feedback current, simulate the current of the DC-DC module.

[0030] The capacitor voltage here refers to the battery-side capacitor voltage at the connection point between the DC-DC module and the battery (i.e., Figure 1 The voltages of capacitors Cbat1 (Vbat1#) and Cbat2 (Vbat2#) are sampled with requirements consistent with the feedback current, requiring no filtering. The design logic stems from the circuit characteristics of the battery-side capacitors (Cbat): in high-frequency scenarios, the capacitive reactance of the capacitor is much smaller than the inductive reactance of the line (i.e., high-frequency current is more easily bypassed through the capacitor), thus the high-frequency circulating current is directly converted into instantaneous fluctuations in the capacitor voltage (high-frequency ripple); while the actual output current of the DC-DC module (the effective current supplied to the battery) is not bypassed by the capacitor, but flows to the battery only through the line. Based on this, the high-frequency changes in the capacitor voltage can inversely characterize the magnitude and direction of the high-frequency circulating current, becoming a key basis for eliminating circulating current.

[0031] Step S3: Based on the current and current reference command of the fictional DC-DC module, the control signal of the DC-DC module is obtained using the current loop control method.

[0032] Optionally, refer to Figure 4 The process of obtaining the control signal of the DC-DC module includes: calculating the difference between the current reference command and the current of the hypothetical DC-DC module to obtain the current deviation; obtaining the modulation wave based on the current deviation using a proportional-integral circuit; and obtaining the control signal of the DC-DC module based on the modulation wave using a preset modulation method.

[0033] The essence of current loop control is deviation correction. The input quantities are a hypothetical real current (I1#, I2#) and a current reference command. The specific process is as follows: Error calculation: The difference between the fictitious current and the current reference command is calculated to obtain the current deviation. If the deviation is positive, it means that the module output current is lower than the target value and the output needs to be increased; if the deviation is negative, the output needs to be decreased. PI controller amplification: The current deviation is input into the proportional-integral (PI) controller. The proportional element (P) quickly responds to the deviation, and the integral element (I) eliminates the static error, outputting a continuous analog control signal. This signal must accurately reflect the adjustment range to avoid new current fluctuations caused by over-control. K PWM Processing unit conversion: The continuous control signal output by the PI controller is converted into a pulse width modulation coefficient (K). PWM It is converted into discrete PWM drive signals (i.e., control signals of the DC-DC module).

[0034] The final output PWM control signal directly drives the power switching transistors (IGBT, MOSFET) inside the DC-DC module: by adjusting the on / off time (duty cycle) of the switching transistors, the output voltage and current of the DC-DC module are precisely adjusted, so that the virtual real current always tracks the current reference command.

[0035] Because the control reference of the current loop in this process is the real current after the high-frequency circulating current has been eliminated, the closed-loop system will not misjudge the circulating current as an effective current and amplify the deviation, thus fundamentally avoiding the vicious cycle of high-frequency circulating current → feedback amplification → resonance → hardware damage. At the same time, the fact that multiple modules are based on the same reference command and synchronized control signal can ensure the consistency of output voltage and current, completely suppress the high-frequency circulating current that flows energy from the high-voltage module to the low-voltage module, and ultimately achieve stable operation and efficient energy conversion of the parallel system.

[0036] In some alternative implementations, the process of creating a fictitious current for the DC-DC module includes: suppressing circulating current in the capacitor voltage to obtain a fictitious capacitor current; and using the sum of the feedback current and the fictitious capacitor current as the fictitious current for the DC-DC module.

[0037] Optionally, the process of suppressing circulating current in the capacitor voltage includes: differentially adjusting the capacitor voltage to obtain an initial capacitor current; and filtering the initial capacitor current to obtain a fictitious capacitor current. Specifically, a first-order low-pass filter is used to filter the initial capacitor current.

[0038] Specifically, refer to Figure 4 According to the basic circuit characteristics of a capacitor, the capacitor current (Ic) is directly proportional to the rate of change of voltage, as expressed by the formula Ic = Cbat(dVbat / dt) (where Cbat is the fixed capacitance of the battery-side capacitor, and dVbat / dt is the instantaneous rate of change of the capacitor voltage). Since the high-frequency circulating current has been converted into high-frequency ripple of Vbat, performing a differential operation on the acquired Vbat converts the voltage fluctuation signal into a current signal. This signal initially reflects the magnitude (the greater the rate of change, the higher the amplitude of the circulating current) and direction of the circulating current in the capacitor bypass (dVbat / dt is positive when the voltage rises, and the current direction is consistent with the circulating current; it is negative when the voltage falls, and the direction is opposite). However, it should be noted that the current signal obtained in this step not only contains the high-frequency circulating current but also includes the switching frequency ripple of the power switching transistors (such as IGBTs and MOSFETs) in the DC-DC module (the frequency is consistent with the PWM carrier frequency and is usually higher than the circulating current frequency). Furthermore, the differential operation itself amplifies high-frequency noise, leading to signal distortion. Therefore, further processing is required.

[0039] The key to circulating current suppression is to eliminate switching ripple and high-frequency noise, retaining only the current component that matches the high-frequency circulating current. A first-order low-pass filter is chosen here, and its core design parameter is the cutoff frequency, which needs to be set according to the actual frequency range of the high-frequency circulating current in the system (usually determined by line impedance and capacitor value). After filtering, the final current signal is the fictitious capacitor current (e.g., Ic1#, Ic2#), which is completely equivalent to the high-frequency circulating current bypassed by the capacitor. This achieves accurate conversion from voltage signal to circulating current component, laying the foundation for subsequent reconstruction of the real current.

[0040] According to Kirchhoff's Current Law, at the output node of the DC-DC module (the common node connecting the module, lines, and capacitors), the current satisfies the following condition: the actual output current of the DC-DC module (I_real) = line feedback current (Idc) + capacitor bypass current (Ic). This is because: part of the current output by the DC-DC module flows to the battery through the lines (i.e., Idc, which is effective energy transfer), and the other part bypasses through the capacitor (i.e., Ic, which is a high-frequency circulating current with no effective energy transfer). Therefore, Idc = I_real - Ic. If Idc is directly used as the feedback reference for current loop control, the closed-loop system will mistakenly regard the Idc, which lacks a circulating current component, as the actual current, thus amplifying the deviation and causing more severe circulating current. However, by reverse derivation, we know that I_real = Idc + Ic. Therefore, the actual output current can be reconstructed by summing Idc and Ic.

[0041] The summed current (I_real = Idc + Ic) is the fictitious DC-DC module current. This fictitious current is not generated out of thin air, but is a precise reconstruction of the real current that is masked by the high-frequency circulating current. This current completely eliminates the high-frequency circulating current component and only contains the effective current delivered by the DC-DC module to the battery. Its amplitude and direction reflect the module's true energy output state. For example, when two DC-DC modules have a momentary voltage difference due to parameter differences, if this is not handled, the feedback current Idc will contain the deviation caused by the circulating current. However, the summed I_real can accurately reflect the effective current delivered by each module to the battery, avoiding the closed-loop system from misjudging the circulating current as the real current, and cutting off the amplification path of the high-frequency circulating current from the control reference level.

[0042] In summary, the process of creating a fictitious DC-DC module current is based on the reverse reconstruction of circuit laws and high-frequency characteristics. By extracting the circulating current through the capacitor voltage and restoring the real current through summation, an interference-free reference signal is finally provided for subsequent current loop control. This is also one of the core innovations of this technical solution in suppressing high-frequency circulating current.

[0043] This embodiment also provides a high-frequency circulating current suppression device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0044] This embodiment provides a high-frequency circulating current suppression device. Based on the above high-frequency circulating current suppression method, the device includes: The first module is used to use the current of the energy storage module as the feedback current; The second module is used to simulate the current of the DC-DC module based on the capacitor voltage and feedback current; The third module is used to obtain the control signal of the DC-DC module based on the current and current reference command of the fictional DC-DC module, using the current loop control method.

[0045] In some alternative implementations, the second module includes: The circulating current suppression unit suppresses the circulating current of the capacitor voltage to obtain a fictitious capacitor current; A fictitious unit is used to take the sum of the feedback current and the fictitious capacitor current as the current of the fictitious DC-DC module.

[0046] The high-frequency circulating current suppression device provided in this embodiment of the invention can execute the high-frequency circulating current suppression method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units described above are the same as in the corresponding embodiments described above, and will not be repeated here.

[0047] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0048] The following is a detailed reference. Figure 5 The diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 001, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 002 or a program loaded from memory 008 into random access memory (RAM) 003. The RAM 003 also stores various programs and data required for the operation of the electronic device. The processor 001, ROM 002, and RAM 003 are interconnected via bus 004. An input / output (I / O) interface 005 is also connected to bus 004.

[0049] Typically, the following devices can be connected to I / O interface 005: input devices 006 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 007 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 008 including, for example, magnetic tapes, hard disks, etc.; and communication devices 009. Communication device 009 allows electronic devices to exchange data via wireless or wired communication with other devices. Although Figure 5 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0050] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication device 009, or installed from memory 008, or installed from ROM 002. When the computer program is executed by processor 001, it performs the functions defined in the high-frequency circulating current suppression method of the embodiments of the present invention.

[0051] Figure 5 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of the present invention.

[0052] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the high-frequency circulating current suppression method shown in the above embodiments is implemented.

[0053] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0054] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for suppressing high-frequency circulating current, characterized in that, In a system where multiple DC-DC modules are connected in parallel to a single energy storage module, and the DC sides of all the DC-DC modules are connected in parallel to the same energy storage module, with a capacitor connected in parallel to the DC side of each DC-DC module, the method for each DC-DC module includes: Use the current of the energy storage module as the feedback current; Based on the capacitor voltage and the feedback current, the current of the hypothetical DC-DC module is calculated. Based on the current and current reference command of the fictional DC-DC module, the control signal of the DC-DC module is obtained using the current loop control method.

2. The high-frequency circulating current suppression method according to claim 1, characterized in that, The process of simulating the current of a DC-DC module includes: By suppressing the circulating current of the capacitor voltage, a fictitious capacitor current is obtained; The sum of the feedback current and the fictitious capacitor current is used as the current of the fictitious DC-DC module.

3. The high-frequency circulating current suppression method according to claim 2, characterized in that, The process of suppressing circulating current in the capacitor voltage includes: The initial capacitor current is obtained by differentially adjusting the capacitor voltage; After filtering the initial capacitor current, the fictitious capacitor current is obtained.

4. The high-frequency circulating current suppression method according to claim 3, characterized in that, The process of filtering the initial capacitor current includes: The initial capacitor current is filtered using a first-order low-pass filter.

5. The high-frequency circulating current suppression method according to claim 1, characterized in that, The process of obtaining the control signal of the DC-DC module using a current loop control method includes: The difference between the current reference command and the current of the hypothetical DC-DC module is calculated to obtain the current deviation; Based on the current deviation, a modulated wave is obtained using a proportional-integral circuit. Based on the modulated wave, the control signal of the DC-DC module is obtained using a preset modulation method.

6. A high-frequency circulating current suppression device, characterized in that, Based on the high-frequency circulating current suppression method according to any one of claims 1-5, the apparatus comprises: The first module is used to use the current of the energy storage module as the feedback current; The second module is used to simulate the current of the DC-DC module based on the capacitor voltage and the feedback current. The third module is used to obtain the control signal of the DC-DC module based on the current and current reference command of the fictional DC-DC module, using a current loop control method.

7. The high-frequency circulating current suppression device according to claim 6, characterized in that, The second module includes: The circulating current suppression unit suppresses the circulating current of the capacitor voltage to obtain a fictitious capacitor current; A fictitious unit is used to take the sum of the feedback current and the fictitious capacitor current as the current of the fictitious DC-DC module.

8. An electronic device, characterized in that, include: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the high-frequency circulating current suppression method according to any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to perform the high-frequency circulating current suppression method according to any one of claims 1 to 5.

10. A computer program product, characterized in that, Includes computer instructions for causing a computer to perform the high-frequency circulating current suppression method according to any one of claims 1 to 5.

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