Soft starting method and device for bidirectional direct-current converter, converter and storage medium

Abstract

The invention discloses a bidirectional direct-current converter soft starting method and device, a converter and a storage medium. The method comprises the following steps: after starting the bidirectional direct-current converter, controlling the bidirectional direct-current converter to operate according to a set value of a control variable; periodically acquiring the current value of the control variable; under the condition that the current value does not reach the preset steady-state value, the current value is used as a new set value to control the operation of the bidirectional direct-current converter until the control variable reaches the steady-state value; wherein the current value of the control variable is determined according to the difference common-mode gain deviation delta Gain obtained by calculating the voltage of the high-voltage side port and the voltage of the low-voltage side port of the bidirectional direct-current converter, and when the delta Gain is closer to 1, the determined current value is closer to the steady-state value of the control variable. According to the embodiment of the invention, a unified soft start strategy is adopted to cope with all working conditions, the scheme is simple and reliable, the soft start control complexity of the bidirectional direct-current converter is remarkably reduced, and the starting speed can be improved on the premise of meeting the starting current requirement.

Description

Technical Field

[0001] The present invention relates to a bidirectional DC converter control technology, and in particular to a bidirectional DC converter soft starting method, a soft starting device, a bidirectional DC converter and a storage medium. Background Art

[0002] In household photovoltaic energy storage system products, the bidirectional DC converter is a module that connects the battery bus and the DC bus, also called an energy storage DC converter. The charging and discharging of the energy storage battery is completely converted by the power of this module and regulated by this module. In household scenarios, the energy storage DC converter needs to be in standby and start quickly frequently. Standby is used to ensure that the energy storage unit has the lowest energy consumption when it is not loaded, and fast start-up ensures that the energy storage power can meet the sudden rapid response requirements of the system. When starting a bidirectional DC converter, there is a problem of starting overcurrent impact, so software starting control is required to meet the starting current requirements. Summary of the invention

[0003] The present application provides a soft-start method, a soft-start device, a bidirectional DC converter and a storage medium for a bidirectional DC converter. A unified soft-start strategy is adopted in the entire starting process to cope with all working conditions. The scheme is simple and reliable, and the soft-start control complexity of the bidirectional DC converter is significantly reduced. The starting speed can be improved while meeting the starting current requirements.

[0004] The present application provides a bidirectional DC converter soft starting method, comprising:

[0005] After the bidirectional DC converter is started, the bidirectional DC converter is controlled to operate according to the set value of the control variable;

[0006] Periodically obtaining the current value of the control variable;

[0007] In the case that the current value does not reach the preset steady-state value, controlling the operation of the bidirectional DC converter with the current value as a new set value until the control variable reaches the steady-state value;

[0008] The current value of the control variable is determined according to the following method:

[0009] Obtaining a high-voltage side port voltage and a low-voltage side port voltage of the bidirectional DC converter, and calculating a differential common-mode gain deviation ΔGain;

[0010] The current value x=f(ΔGain) is calculated according to a preset first function f(ΔGain);

[0011] The closer ΔGain is to 1, the closer f(ΔGain) is to the steady-state value of the control variable.

[0012] The present application also provides a soft start control device, which is applied to a bidirectional DC converter, comprising:

[0013] one or more processors;

[0014] a storage device for storing one or more programs,

[0015] When the one or more programs are executed by the one or more processors, the one or more processors implement the bidirectional DC converter soft starting method as described in any embodiment of the present disclosure.

[0016] The present application also provides a bidirectional DC converter, comprising:

[0017] Control devices and conversion circuits;

[0018] Wherein, the conversion circuit includes a controllable switch group, and the control device adopts the soft start control device as described in any embodiment of the present disclosure;

[0019] The control device controls the operation of the bidirectional DC converter by controlling the switches of the controllable switch group.

[0020] The present application also provides a computer storage medium, in which a computer program is stored, wherein the computer program is configured to execute the bidirectional DC converter soft starting method as described in any embodiment of the present disclosure when running.

[0021] Compared with the related art, the solution of the present application is based on the differential common mode gain deviation ΔGain of the high and low voltage side port voltages at both ends of the bidirectional DC converter, and uses the first function f(ΔGain) to calculate the corresponding value as the control variable to control the entire soft start process. This achieves soft start process control without paying attention to the working conditions of each stage and using a unified strategy.

[0022] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0024] Figure 1 Schematic diagram of a microgrid system including a bidirectional DC converter in some possible implementation schemes;

[0025] Figure 2A flow chart of a bidirectional DC converter soft starting method provided in an embodiment of the present application;

[0026] Figure 3 A flow chart of another bidirectional DC converter soft starting method provided in an embodiment of the present application;

[0027] Figure 4 A flow chart of another bidirectional DC converter soft starting method provided in an embodiment of the present application;

[0028] Figure 5 A flow chart of another bidirectional DC converter soft starting method provided in an embodiment of the present application;

[0029] Figure 6 A schematic diagram of the modulation frequency control during the soft start process provided in an embodiment of the present application;

[0030] Figure 7 A structural diagram of a bidirectional DC converter provided in an embodiment of the present application;

[0031] Figure 8 A schematic diagram of another bidirectional DC converter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0033] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0034] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0035] Figure 1 In the microgrid system shown, the bidirectional DC converter (also known as the bidirectional resonant DC converter, referred to as the bidirectional converter) can effectively realize the energy conversion between the two-level bus. In the actual application scenario, the bidirectional converter needs to start quickly to support the high-voltage side or the low-voltage side voltage. Typical application scenarios include low-voltage battery energy storage systems, where the low-voltage battery is boosted by the open-loop control of the bidirectional converter, and then connected to the DC (or AC) bus for secondary boost (or inversion) and energy control through the control circuit of the subsequent stage. When the system does not need to charge and discharge the battery, it is hoped that the energy storage system will enter the standby mode to reduce the system power consumption. When the system needs to charge and discharge the battery, it is hoped that the energy storage system will immediately consume or absorb the energy of the system. If the energy storage system starts slowly, the system may crash due to power imbalance. In the system shutdown state, the battery voltage is used for black start or the battery is charged and activated through the DC (or AC) bus, which does not require high starting speed. Therefore, the starting logic of the modular bidirectional converter is to increase the starting speed as much as possible while meeting the starting current requirements.

[0036] However, during the startup process of the entire system, due to the presence of capacitance between the two-stage DC bus, and the electricity on the two-stage bus before startup is also affected by other circuits on the bus. Therefore, when the bidirectional DC converter is started, it is easy to have the impact of starting overcurrent, so software is needed to control the startup, usually by gradually changing the value of a control variable modulated by the bridge arm, rather than immediately setting it to the normal working value, so that it changes from the initial value to the steady-state value; this process must adapt to the variable working modes in various household photovoltaic storage scenarios, and often corresponds to different control strategies. For example, when the initial voltage of the DC bus is 0V, the photovoltaic storage system has not yet started, and the bidirectional DC converter (energy storage converter) should start slowly to avoid overcurrent; when the initial voltage of the DC bus is near the working value, the bidirectional DC converter (energy storage converter) should start quickly to meet the needs of fast power response; and other various working conditions that consider photovoltaic and grid conditions.

[0037] Due to the bidirectional power of the converter and the variable working conditions in household solar-storage scenarios, a single traditional soft start strategy has poor adaptability. In some feasible solutions, it is often necessary to configure multiple soft start strategies, judge the current working conditions, and select a suitable one from multiple strategies. This judgment often has blind spots and poor adaptability to continuously changing working conditions.

[0038] The present disclosure provides a bidirectional DC converter soft starting method. Figure 2 As shown, including,

[0039] Step 210, after starting the bidirectional DC converter, control the bidirectional DC converter to operate according to the set value of the control variable;

[0040] Step 220, periodically obtaining the current value of the control variable;

[0041] Step 230, when the current value does not reach the preset steady-state value, control the operation of the bidirectional DC converter using the current value as a new set value until the control variable reaches the steady-state value;

[0042] The current value of the control variable is determined according to the following method:

[0043] Obtaining a high-voltage side port voltage and a low-voltage side port voltage of the bidirectional DC converter, and calculating a differential common-mode gain deviation ΔGain;

[0044] The current value x=f(ΔGain) is calculated according to a preset first function f(ΔGain);

[0045] The closer ΔGain is to 1, the closer f(ΔGain) is to the steady-state value of the control variable.

[0046] In some exemplary embodiments, the first function f(ΔGain) is a continuous function, and the closer ΔGain is to 1, the closer f(ΔGain) is to the steady-state value of the controlled variable.

[0047] In some exemplary embodiments, the closer the differential common-mode gain deviation ΔGain is to 1, the greater the slope of the current value x is.

[0048] It can be understood that when the first function f(ΔGain) is used to calculate the current value x of the control variable, when the differential common-mode gain deviation ΔGain does not change suddenly, the calculated current value x also does not change suddenly.

[0049] In some exemplary embodiments, the soft start process is substantially as follows: Figure 3 As shown, including:

[0050] Step 310: The bidirectional DC converter starts to operate with the initial bias value of the control variable, that is, with the initial bias value x t0 Start operation as the first set value of the control variable;

[0051] Step 320, calculate the current value x according to the first function f(ΔGain),

[0052] Step 330, determine whether the current value has reached a steady-state value; if x has not reached the steady-state value x res In the case of reaching the steady-state value x, step 340 is executed; res In the case of , executing step 350;

[0053] Step 340, using the current value as a new set value of the control variable to control the operation of the bidirectional DC converter, that is, using the current value x as the set value of the control variable for the next round to continue the soft start process;

[0054] Step 350, ending the current soft start process, that is, stopping adjusting the control variable, and the bidirectional DC converter maintains steady-state operation.

[0055] It should be noted that the initial bias value x t0 The first set value of the control variable is used to start the operation, also called the initial value of the control variable.

[0056] It can be understood that the soft start solution provided by the embodiment of the present disclosure uses the current value of the control variable as the judgment basis for continuing to iterate the soft start process, and each round of iteration uses the same control variable and consistent judgment criteria.

[0057] In some exemplary embodiments, the current value of the control variable is periodically obtained in step 220, and the period refers to an iteration period. The duration of each iteration period can be an equal preset duration, for example, 30 milliseconds. After the new setting value takes effect for 30 milliseconds, the current value of this round is obtained; or, the duration of each iteration period can be unequal, for example, as the number of iterations increases, the duration of each cycle gradually decreases or increases. More examples of the duration of the cycle are not discussed here one by one, and can be flexibly set as needed.

[0058] In some exemplary embodiments, the first function f(ΔGain) is:

[0059]

[0060] Among them, n and m are the times of the power, is the preset constant, K p and K i is the preset constant coefficient, x t0 is the initial bias value of the control variable, and t0 is the initial value time. toThe first setpoint as the control variable controls the operation of the bidirectional DC converter.

[0061] In some exemplary embodiments, the differential common mode gain deviation ΔGain is calculated according to the following method:

[0062]

[0063] Among them, Gain rate is the rated gain of the bidirectional DC converter, is the current capacitor voltage at the low-voltage side port, is the current capacitor voltage at the high-voltage side port.

[0064] In some exemplary embodiments, Gain rate Gain is obtained by dividing the rated voltage of the high voltage side by the rated voltage of the low voltage side. Optionally, it can also be calculated in other ways, not limited to the aspects of the examples of the present disclosure. It can be understood that in the case of a bidirectional DC converter, Gain rate is a constant.

[0065] In some exemplary embodiments, the and They are respectively the per unit (value) of the current capacitor voltage at the low-voltage side port and the per unit (value) of the current capacitor voltage at the high-voltage side port.

[0066] It can be seen that in some exemplary embodiments, the first function f(ΔGain) includes two power functions of ΔGain, and is equipped with a proportional and time integral link. p and K i The values ​​of these constants may be different for different bidirectional DC converters. In some exemplary embodiments, n and m are positive integers, K p and K i Takes a positive floating point number.

[0067] Some embodiments of the present invention propose a unified startup control strategy based on the power function of the differential common-mode gain deviation: sampling the voltages across the bidirectional converter, calculating the absolute value of the ratio of the differential mode value to the common mode value of the two voltages after standardization, subtracting the absolute value from 1 to obtain a difference (differential common-mode gain deviation), calculating the current value of the difference according to a first function f(ΔGain), and when the soft start end condition is not met, the control variable takes the current value for the next round of iteration, wherein the first function includes the power function calculation result of the difference and the time integral of the power function calculation result.

[0068] In some exemplary embodiments, the control variable includes: a modulation frequency of the bidirectional DC converter, a duty cycle of the bidirectional DC converter, or a dead zone of the bidirectional DC converter.

[0069] It can be understood that when the control variable is determined, its initial bias value corresponds to the initial modulation frequency, the initial duty cycle or the initial dead zone; the current value calculated according to the first function corresponds to the current modulation frequency, the current duty cycle or the current dead zone; the preset steady-state value corresponds to the preset modulation frequency steady-state value, the preset duty cycle steady-state value or the preset dead zone steady-state value.

[0070] In some exemplary embodiments, when the control variable is the modulation frequency of a bidirectional DC converter, if the current value of the modulation frequency is less than or equal to a preset steady-state value, it is determined that the steady-state value has been reached and the iterative loop will be exited; if the current value of the modulation frequency is greater than the preset steady-state value, it is determined that the steady-state value has not been reached and the next round of iteration will continue.

[0071] In some exemplary embodiments, when the control variable is the duty cycle of a bidirectional DC converter, if the current value of the duty cycle is greater than or equal to a preset steady-state value, it is determined that the steady-state value has been reached and the iterative loop will exit; if the current value of the duty cycle is less than the preset steady-state value, it is determined that the steady-state value has not been reached and the next round of iteration will continue.

[0072] In some exemplary embodiments, when the control variable is the dead zone of a bidirectional DC converter, if the current value of the dead zone is less than or equal to a preset steady-state value, it is determined that the steady-state value has been reached and the iterative loop will be exited; if the current value of the dead zone is greater than the preset steady-state value, it is determined that the steady-state value has not been reached and the next round of iteration will continue.

[0073] In some exemplary embodiments, the method further comprises:

[0074] Step 240: When the current value reaches a preset steady-state value, control the bidirectional DC converter to operate with the steady-state value.

[0075] It can be understood that when the current value reaches the preset steady-state value, the bidirectional DC converter ends the soft start process and reaches a steady state.

[0076] The present disclosure also provides a bidirectional DC converter soft starting method. Figure 4 As shown, including:

[0077] Step 400, with an initial bias value x t0 Starting the bidirectional DC converter;

[0078] Step 410: Obtain the voltage across the bidirectional DC converter and

[0079] Step 420, calculate the differential common mode gain deviation ΔGain:

[0080]

[0081] Step 430, calculate the current value x of the control variable:

[0082]

[0083] Step 440, determine whether the current value x reaches the steady-state value x res If it is not reached, the bidirectional DC converter is controlled to operate with the current value x as the set value, and wait for the next iteration; if it is reached, execute step 450;

[0084] Step 450: The bidirectional DC converter is controlled at a steady-state value x of the control variable. res Run, end soft start.

[0085] It can be seen that as the number of iterations increases, the differential common-mode gain deviation ΔGain will automatically change toward 1, and the control variable x will gradually change to the steady-state value x of the bidirectional converter. res , and finally complete the soft start.

[0086] It can be understood that the differential common-mode gain deviation ΔGain is calculated based on the voltages of the high-voltage side port and the low-voltage side port, the current value of the control variable is calculated in a consistent manner, and it is determined whether to continue the next round of iteration. This can automatically adapt to the scenario where there is residual pressure on the port capacitor, dynamically adjust the actual soft-start process in each scenario, and achieve the purpose of fast starting.

[0087] The disclosed embodiment also provides a bidirectional DC converter soft starting method, wherein the control variable is the modulation frequency f, such as Figure 5 As shown, including:

[0088] Step 500, using the modulation frequency initial offset value f t0 Starting the bidirectional DC converter;

[0089] Step 510: Obtain the voltage across the bidirectional DC converter and

[0090] Step 520, calculating the differential common mode gain deviation ΔGain:

[0091]

[0092] Step 530, calculate the current value f of the modulation frequency:

[0093]

[0094] Step 540: Determine whether the current value f of the modulation frequency is less than or equal to the steady-state value f of the modulation frequency. If it is less than or equal to, execute Step 550; if it is greater than, control the modulation frequency of the bidirectional DC converter with the current value f as the set value and wait for the next iteration. res

[0095] Step 550: The bidirectional DC converter operates at the steady-state value f of the modulation frequency, and the soft start is ended. res

[0096] It can be seen that as the number of iterations increases, the differential common-mode gain deviation ΔGain will automatically approach 1, and the control variable modulation frequency f will also gradually change to the steady-state value f of the modulation frequency of the bidirectional converter, res finally completing the soft start.

[0097] In the case where the control variable is the modulation frequency, during the soft start process, the modulation frequency f of the bidirectional DC converter starts from the initial bias value (also called the initial value) f t0 and gradually becomes smaller through multiple iterations until it is less than or equal to the steady-state value f, res ending the iteration and completing the soft start process, and then maintaining the steady-state value f res for operation. As Figure 6 shown, during the soft start process, it changes from the initial bias value f at time t0 t0 to f at time t1 t1 ,......, and finally reaches the steady-state value f res .

[0098] The embodiment of the present disclosure also provides a soft start control device, which is applied to a bidirectional DC converter and includes:

[0099] One or more processors;

[0100] A storage device for storing one or more programs.

[0101] When the one or more programs are executed by the one or more processors, the one or more processors implement the soft start method of the bidirectional DC converter as described in any embodiment of the present disclosure.

[0102] The embodiment of the present disclosure also provides a bidirectional DC converter, as Figure 7 , including:

[0103] A control device 710 and a conversion circuit 720;

[0104] wherein, the conversion circuit 720 includes a controllable switch group, and the control device 710 adopts the soft start control device as claimed in claim 5;

[0105] The control device 710 controls the operation of the bidirectional DC converter by controlling the switches of the controllable switch group.

[0106] It can be seen that in some exemplary embodiments, the software for implementing the soft start solution can be independently configured in a modular manner in the bidirectional DC converter, which is conducive to convenient and flexible implementation and deployment of the soft start control solution.

[0107] In some exemplary embodiments, the controllable switch group includes: a full-bridge topology controllable switch group or a half-bridge topology controllable switch group.

[0108] In some exemplary embodiments, Figure 8 As shown, the controllable switch group includes 8 switches S1-S8.

[0109] In some exemplary embodiments, Figure 8 As shown, the conversion circuit also includes: a high-voltage side port capacitor C M and the low voltage side port capacitor C L ;

[0110] The control device obtains the high-voltage side port voltage and the low-voltage side port voltage of the bidirectional DC converter by: obtaining the high-voltage side port capacitor C M Voltage and the low voltage side port capacitor C L Voltage

[0111] In some exemplary embodiments, the control variable includes: a modulation frequency of the controllable switch group, a duty cycle of the controllable switch group, or a dead zone of the controllable switch group.

[0112] An embodiment of the present disclosure further provides a computer storage medium, wherein the storage medium stores a computer program, wherein the computer program is configured to execute the bidirectional DC converter soft starting method as described in any embodiment of the present disclosure when running.

[0113] The soft start solution provided by the embodiment of the present disclosure uses a unified soft start strategy to deal with all starting conditions, reduces the complexity of the strategy and is simple and reliable. It can adaptively coordinate and meet the conflicting requirements of "starting speed as fast as possible" and "current and voltage impact as small as possible during starting", so that the power regulation during the soft start process has a higher order of smoothness and rapidity than the piecewise linear regulation. After the bidirectional converter is in short-term standby, there is residual voltage on the two-port capacitors. When the operation is resumed, according to the solution provided by the embodiment of the present disclosure, the residual voltage value can be automatically used to make the soft start faster.

[0114] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A soft starting method for a bidirectional DC converter, It is characterized in that include, After the bidirectional DC converter is started, the bidirectional DC converter is controlled to operate according to the set value of the control variable; Periodically obtaining the current value of the control variable; In the case that the current value does not reach the preset steady-state value, controlling the operation of the bidirectional DC converter with the current value as a new set value until the control variable reaches the steady-state value; The current value of the control variable is determined according to the following method: Obtaining a high-voltage side port voltage and a low-voltage side port voltage of the bidirectional DC converter, and calculating a differential common-mode gain deviation ΔGain; The current value x=f(ΔGain) is calculated according to a preset first function f(ΔGain); The closer ΔGain is to 1, the closer f(ΔGain) is to the steady-state value of the control variable.

2. The method according to claim 1, It is characterized in that The first function f(ΔGain) is: Among them, n and m are the times of the power, is the preset constant, K p and K i is the preset constant coefficient, x t0 is the initial bias value of the control variable, and t0 is the initial value time.

3. The method according to claim 1 or 2, It is characterized in that The differential common mode gain deviation ΔGain is calculated according to the following method: Among them, Gain rate is the rated gain of the bidirectional DC converter, is the current capacitor voltage at the low-voltage side port, is the current capacitor voltage at the high-voltage side port.

4. The method according to claim 1 or 2, It is characterized in that The control variables include: the modulation frequency of the bidirectional DC converter, the duty cycle of the bidirectional DC converter or the dead zone of the bidirectional DC converter.

5. A soft start control device, It is characterized in that Applied to bidirectional DC converters, including: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the bidirectional DC converter soft starting method as described in any one of claims 1 to 4.

6. A bidirectional DC converter, It is characterized in that include: Control devices and conversion circuits; Wherein, the conversion circuit includes a controllable switch group, and the control device adopts the soft start control device as claimed in claim 5; The control device controls the operation of the bidirectional DC converter by controlling the switches of the controllable switch group.

7. The bidirectional DC converter according to claim 6, It is characterized in that The controllable switch group includes: a full-bridge topology controllable switch group or a half-bridge topology controllable switch group.

8. The bidirectional DC converter according to claim 6 or 7, It is characterized in that The conversion circuit also includes: a high-voltage side port capacitor and a low-voltage side port capacitor; The control device obtains the high-voltage side port voltage and the low-voltage side port voltage of the bidirectional DC converter by: obtaining the voltage of the high-voltage side port capacitor and the voltage of the low-voltage side port capacitor.

9. The bidirectional DC converter according to claim 6 or 7, It is characterized in that The control variables include: a modulation frequency of the controllable switch group, a duty cycle of the controllable switch group, or a dead zone of the controllable switch group.

10. A computer storage medium, It is characterized in that The storage medium stores a computer program, wherein the computer program is configured to execute the bidirectional DC converter soft starting method according to any one of claims 1 to 4 when running.

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