Dual-active bridge converter control method, controller and energy storage power supply

Abstract

The invention relates to a dual active bridge converter control method, a controller and an energy storage power supply. The method comprises the following steps: determining a control strategy of the dual-active bridge converter according to a voltage ratio of a primary side to a secondary side of a transformer at a current moment and working parameters at the current moment in a working process of the dual-active bridge converter; executing a control strategy on the dual-active bridge converter; and if the working efficiency of the dual active bridge converter after the execution of the control strategy does not meet the preset condition, re-determining and executing a new control strategy of the dual active bridge converter until the working efficiency of the dual active bridge converter meets the preset condition. By adopting the method, the working efficiency of the DAB converter can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of dual active bridge converters, and in particular to a dual active bridge converter control method, a controller and an energy storage power supply. Background Art

[0002] Dual Active Bridge (DAB) converter is widely used in distributed power generation and energy storage power supply due to its high power density, bidirectional energy transfer and easy soft switching.

[0003] Based on this, the relevant technology can optimize the energy conversion process of the DAB converter, reduce energy loss, and improve the working efficiency of the DAB converter by controlling the output voltage of the DAB converter.

[0004] However, the method of the related art cannot accurately control the output voltage of the DAB converter, resulting in poor working efficiency of the DAB converter. Summary of the invention

[0005] Based on this, it is necessary to provide a dual active bridge converter control method, controller and energy storage power supply to address the above technical problems, which can improve the working efficiency of the DAB converter.

[0006] In a first aspect, the present application provides a dual active bridge converter control method, comprising:

[0007] Determine the control strategy of the dual active bridge converter according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the operation of the dual active bridge converter;

[0008] implementing a control strategy for a dual active bridge converter;

[0009] If the working efficiency of the dual active bridge converter after the control strategy is executed does not meet the preset conditions, a new control strategy for the dual active bridge converter is re-determined and executed until the working efficiency of the dual active bridge converter meets the preset conditions.

[0010] In one embodiment, according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the operation of the dual active bridge converter, the control strategy of the dual active bridge converter is determined, including:

[0011] Based on the voltage ratio at the current moment and the working parameters at the current moment, determining the target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation;

[0012] Calculating the target output power of the dual active bridge converter according to the target voltage ratio;

[0013] The control strategy of the dual active bridge converter is determined according to the target voltage ratio and the target output power.

[0014] In one embodiment, a control strategy of a dual active bridge converter is determined according to a target voltage ratio and a target output power, including:

[0015] Obtaining a comparison result between a target voltage ratio and a preset threshold value;

[0016] Based on the comparison result and the range of the target output power, the control strategy of the dual active bridge converter is determined.

[0017] In one embodiment, based on the comparison result and the range of the target output power, a control strategy of the dual active bridge converter is determined, including:

[0018] If the comparison result is that the target voltage ratio is greater than the preset threshold value and the target output power is within the first range, a first control strategy of the dual active bridge converter is obtained based on the first mapping relationship;

[0019] If the comparison result is that the target voltage ratio is greater than the preset threshold value and the target output power is within the second range, a second control strategy of the dual active bridge converter is obtained based on the second mapping relationship;

[0020] If the comparison result is that the target voltage ratio is less than or equal to the preset threshold value, and the target output power is in a third range, a third control strategy of the dual active bridge converter is obtained based on a third mapping relationship;

[0021] If the comparison result is that the target voltage ratio is less than or equal to the preset threshold, and the target output power is in a fourth range, a fourth control strategy of the dual active bridge converter is acquired based on a fourth mapping relationship.

[0022] In one embodiment, based on the voltage ratio at the current moment and the operating parameters at the current moment, determining the target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation includes:

[0023] Based on the voltage ratio at the current moment and the working parameters at the current moment, a voltage ratio matching the dual active bridge converter is searched from a preset parameter database, and the matching voltage ratio is used as a target voltage ratio.

[0024] In one embodiment, based on the voltage ratio at the current moment and the operating parameters at the current moment, determining the target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation includes:

[0025] Based on the working parameters at the current moment, the voltage ratio increment between the primary side and the secondary side of the transformer of the dual active bridge converter at the current moment is obtained;

[0026] The sum of the voltage ratio increment at the current moment and the voltage ratio at the current moment is taken as the target voltage ratio.

[0027] In one embodiment, based on the voltage ratio at the current moment and the operating parameters at the current moment, determining the target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation includes:

[0028] Based on the voltage ratio at the current moment and the working parameters at the current moment, searching for a voltage ratio matching the dual active bridge converter from a preset parameter database, and using the matching voltage ratio as a candidate voltage ratio;

[0029] Based on the working parameters at the current moment, the voltage ratio increment between the primary side and the secondary side of the transformer of the dual active bridge converter at the current moment is obtained;

[0030] The sum of the voltage ratio increment at the current moment and the candidate voltage ratio is taken as the target voltage ratio.

[0031] In one embodiment, the target output power of the dual active bridge converter is calculated according to the target voltage ratio, including:

[0032] Calculating the product of the target voltage ratio and the input voltage of the dual active bridge converter, and using the product as the target output voltage of the dual active bridge converter;

[0033] The product of the target output voltage and the target output current is taken as the target output power of the dual active bridge converter.

[0034] In a second aspect, the present application also provides a dual active bridge converter control device, comprising:

[0035] A first determination module is used to determine the control strategy of the dual active bridge converter according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the operation of the dual active bridge converter;

[0036] An execution module, used for executing a control strategy on the dual active bridge converter;

[0037] The second determination module is used to re-determine and execute a new control strategy for the dual active bridge converter when the working efficiency of the dual active bridge converter after the control strategy is executed does not meet the preset conditions until the working efficiency of the dual active bridge converter meets the preset conditions.

[0038] In a third aspect, the present application further provides a controller comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the content of any one embodiment of the dual active bridge converter control method in the above-mentioned first aspect is implemented.

[0039] In a fourth aspect, the present application also provides an energy storage power supply, which includes a controller and a dual active bridge converter.

[0040] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the contents of any one embodiment of the dual active bridge converter control method in the first aspect above.

[0041] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the content of any one embodiment of the dual active bridge converter control method in the first aspect above.

[0042] The above-mentioned dual active bridge converter control method, controller and energy storage power supply determine the control strategy of the dual active bridge converter according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the working process of the dual active bridge converter; execute the control strategy on the dual active bridge converter; if the working efficiency of the dual active bridge converter after the control strategy is executed does not meet the preset conditions, then re-determine and execute the new control strategy of the dual active bridge converter until the working efficiency of the dual active bridge converter meets the preset conditions. When determining the control strategy at the current moment, the method uses the working parameters and voltage ratio at the current moment, and based on the actual data in the working process, it can determine a control strategy that is more suitable for the current moment. In this way, the execution of the control strategy will be more targeted, and after each execution of the control strategy, the preset condition corresponding to the working efficiency is used as the stop condition of the iterative step, which can reduce the control time of the dual active bridge converter and improve the working efficiency of the dual active bridge converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of the topological structure of a full-bridge DAB converter in one embodiment;

[0045] Figure 2 is an equivalent circuit diagram of a full-bridge DAB converter in one embodiment;

[0046] Figure 3 is a curve showing a change in resistance of a power device in a DAB converter as a function of temperature in one embodiment;

[0047] Figure 4is a schematic diagram of a curve of current and efficiency at different voltage ratios in one embodiment;

[0048] Figure 5 A schematic diagram of the relationship between the voltage ratio and the power device state in one embodiment;

[0049] Figure 6 An environmental schematic diagram of a dual active bridge converter control method in one embodiment;

[0050] Figure 7 is a schematic flow chart of a dual active bridge converter control method in one embodiment;

[0051] Figure 8 is a schematic flow chart of a dual active bridge converter control method in one embodiment;

[0052] Fig. 9 is a schematic flow chart of a dual active bridge converter control method in one embodiment;

[0053] Fig.10 is an equivalent circuit diagram of a full-bridge DAB converter in one embodiment;

[0054] Fig.11 is a schematic flow chart of a dual active bridge converter control method in one embodiment;

[0055] Fig.12 is a schematic flow chart of a dual active bridge converter control method in one embodiment;

[0056] Fig.13 is a schematic flow chart of a dual active bridge converter control method in one embodiment;

[0057] Fig.14 is a schematic flow chart of a dual active bridge converter control method in one embodiment;

[0058] Fig.15 is a schematic flow chart of a dual active bridge converter control method in one embodiment;

[0059] Fig.16 FIG. 4 is a schematic structural diagram of a dual active bridge converter control device in an embodiment. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0061] Before introducing the technical solution of the present application in detail, a brief introduction to the background technology of the present application is first given.

[0062] Figure 1 It is a schematic diagram of the topology of a full-bridge DAB converter. It can be seen from the figure that the full-bridge DAB converter consists of two power supplies, two full-bridge circuits, three capacitors, an inductor L, and a transformer T, and can achieve electrical isolation and bidirectional power transmission. Among them, the two power supplies are the input power supply and the output power supply respectively. The input voltage of the input power supply is represented as Ui, and the output voltage of the output power supply is represented as U0. Each full-bridge circuit includes four switching tubes. The four switching tubes in the first full-bridge circuit are S1, S2, S3, and S4 respectively, and the four switching tubes in the second full-bridge circuit are Q1, Q2, Q3, and Q4 respectively. The three capacitors are the input capacitor Ci, the output capacitor C0, and the DC-blocking capacitor C.

[0063] Figure 2 It represents the equivalent circuit diagram of the full-bridge DAB converter. UP in the figure represents Figure 1 the left half in it, and n*Us represents the transformer and the right half. The influence of actual parameter values on the circuit is not considered in this figure, that is, the device parameters are all determined based on theoretical values.

[0064] In related technologies, in order to improve the working efficiency of the DAB converter, mainly the theoretical parameter information of the power devices in the DAB converter is used to predict the control strategy of the power devices. And the control strategy is used to adjust the power device parameters in the actual working process of the DAB converter to change the output voltage of the DAB converter. However, the hardware parameters of the DAB converter (for example, the stray parameters of the actual circuit, the parasitic parameters of the power devices) will change with different working temperatures, working voltages, working currents, and the layout and wiring on the Printed Circuit Board (PCB). Through the methods of related technologies, the output voltage of the DAB converter cannot be accurately controlled, resulting in poor working efficiency of the DAB converter. Exemplarily, Figure 3 It is the curve of the resistance value of the power device in the DAB converter changing with temperature. It can be seen from the figure that as the temperature increases, the resistance value of the power device will first decrease and then increase.

[0065] Figure 4 It is a schematic diagram of the curves of current and efficiency under different voltage ratios. The figure includes two voltage ratios, k1 and k2 respectively. Due to the differences in actual hardware parameters and operating conditions, in a part of the power range, the efficiency under Uo1 = k1*Ui is less than the efficiency under Uo2 = k2*Ui. For example, at the current Xa point, A1 < A2. In another part of the power range, it is the opposite. For example, at the current Xb point, B1 > B2. Therefore, according to the differences in operating parameters such as current, the ratio k is dynamically adjusted to improve the efficiency.

[0066] In response to the above problems, the present application provides a dual active bridge converter control method, controller and energy storage power supply, which considers the parameter information of the actual working process of the dual active bridge converter and performs control based on the actual parameter information to improve the working efficiency of the DAB converter. Figure 5 Schematic diagram showing the relationship between voltage ratio and power device state. Whether the power devices of the DAB converter work in the soft switching (Zero Voltage Switching, ZVS) state affects the working efficiency of the DAB converter. Theoretically, according to the characteristics of the DAB converter, the positions of the power devices working in the soft switching (ZVS) state are different for different load powers and different ratios k. As can be seen from the figure, the primary power devices in the DAB converter in the upper gray area work in the non-soft switching (ZVS) state; the secondary power devices in the DAB converter in the lower gray area work in the non-soft switching (ZVS) state; the primary power devices and the secondary power devices in the DAB converter in the middle white area both work in the soft switching (ZVS) state. In this state, the efficiency of the DAB converter is the highest, especially when k*=1, the primary and secondary power devices of the DAB work in the soft switching (ZVS) state. At this time, the working efficiency of the DAB converter is the highest.

[0067] Of course, the technical solution provided in the embodiments of the present application is not limited to solving the above-mentioned problems, but also has other technical effects, which can be specifically described in the following embodiments.

[0068] The dual active bridge converter control method provided in the embodiment of the present application can be applied to Figure 6 In the application environment shown. The controller in the application environment may be, but is not limited to, a pulse width modulation (PWM) control chip, an integrated circuit (IC), a voltage reference source, a phase-locked loop (PLL) control chip, a current detection chip, a metal-oxide-semiconductor field-effect transistor (MOSFET) driver chip, etc. The memory of the controller may include a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data in the control process of the dual active bridge converter. The network interface of the computer device is used to communicate with an external terminal through a network connection, and the computer program is executed by the processor to implement a dual active bridge converter control method.

[0069] In an exemplary embodiment, Figure 7 As shown, a dual active bridge converter control method is provided, and the method is applied to Figure 1 The controller in FIG. 1 is taken as an example to illustrate the method, which includes the following steps 201 to 203. Among them:

[0070] S201, determining a control strategy of the dual active bridge converter according to a voltage ratio between a primary side and a secondary side of a transformer at a current moment and an operating parameter at a current moment during operation of the dual active bridge converter.

[0071] In the ideal working process of the dual active bridge converter, the voltage ratio between the primary and secondary sides of the transformer at any time is the ideal voltage ratio n of the primary and secondary sides of the transformer. However, as the working time of the dual active bridge converter increases, the hardware parameters of the DAB converter will change with the working temperature, working voltage, working current, and PCB layout and wiring. At this time, the voltage ratio between the primary and secondary sides of the transformer at the current moment will change accordingly.

[0072] In an embodiment of the present application, when it is necessary to improve the working efficiency of the dual active bridge converter, the controller can collect the working parameters at the current moment through a working parameter acquisition device. For example, the input voltage and output voltage of the dual active bridge converter can be collected through a multimeter or a sampling circuit. After obtaining the working parameters of the dual active bridge converter at the current moment, the controller can predict the voltage ratio between the primary side and the secondary side of the transformer at the current moment based on the working parameters at the current moment and the ideal voltage ratio n between the primary side and the secondary side of the transformer. Alternatively, the controller can also search for the voltage ratio corresponding to the working parameters at the current moment from a preset parameter database based on the working parameters at the current moment and the ideal voltage ratio n between the primary side and the secondary side of the transformer. The embodiment of the present application does not limit the method for obtaining the voltage ratio between the primary side and the secondary side of the transformer at the current moment.

[0073] Furthermore, after obtaining the voltage ratio between the primary and secondary sides of the transformer and the working parameters at the current moment, the controller can calculate the working efficiency at the current moment based on the voltage ratio and working parameters at the current moment. And according to the difference between the working efficiency at the current moment and the target efficiency, determine the control strategy corresponding to the efficiency difference. Alternatively, the controller can also take a certain efficiency increment as a target and determine the control strategy corresponding to the efficiency increment. The efficiency increment refers to the difference between two adjacent efficiencies. For example, when the working efficiency at the current moment is 80% and the efficiency increment is 5%, after the control strategy is adjusted, the working efficiency at the next moment may be 85% or close to 85%.

[0074] It should be noted that the control strategy is mainly aimed at adjusting multiple switch tubes in the DAB converter. By adjusting the multiple switch tubes, the output voltage of the DAB converter is changed to adjust the working efficiency of the DAB converter.

[0075] S202, executing a control strategy for the dual active bridge converter.

[0076] In the embodiment of the present application, after obtaining the control strategy corresponding to the working parameters at the current moment, the controller can perform phase shift control on the power devices in the dual active bridge converter based on the control strategy. The power devices refer to multiple switch tubes in the dual active bridge converter, that is, the duty cycle of the control signals of the multiple switch tubes is adjusted to complete the process of the DAB converter executing the control strategy.

[0077] S203, if the working efficiency of the dual active bridge converter after the control strategy is executed does not meet the preset conditions, a new control strategy of the dual active bridge converter is re-determined and executed until the working efficiency of the dual active bridge converter meets the preset conditions.

[0078] In an embodiment of the present application, after the control strategy of the DAB converter is executed, the controller can obtain the output voltage U0, output current I0, input voltage Ui and input current Ii of the DAB converter through the working parameter acquisition device. And according to the output voltage U0 and the output current I0, the output power of the DAB converter is calculated. The output power P0 can be expressed as: P0 = U0 × I0. And, according to the input voltage Ui and the input current Ii, the input power of the DAB converter is calculated. The input power Pi can be expressed as: Pi = Ui × Ii. Then the ratio of the output power P0 to the input power is used as the working efficiency after the control strategy is executed, and the working efficiency η can be expressed as η = P0 / Pi.

[0079] After obtaining the working efficiency, the controller can compare the working efficiency with the preset threshold. If the working efficiency is greater than or equal to the preset threshold, it means that the working efficiency after the control strategy is executed meets the preset conditions, that is, the working efficiency of the DAB converter is high, and there is no need to control the DAB converter in the future. If the working efficiency is less than the preset threshold, it means that the working efficiency after the control strategy is executed does not meet the preset conditions. At this time, it is necessary to re-acquire the voltage ratio and the working parameters at the current moment, determine the new control strategy of the dual active bridge converter, and then execute the new control strategy on the dual active bridge converter. After execution, continue to determine whether the working efficiency meets the preset conditions in the above manner. If not, continue to iterate the above steps; if satisfied, the control process of the DAB converter is completed.

[0080] In the above dual active bridge converter control method, the control strategy of the dual active bridge converter is determined according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the working process of the dual active bridge converter; the control strategy is executed on the dual active bridge converter; if the working efficiency of the dual active bridge converter after the control strategy is executed does not meet the preset conditions, the new control strategy of the dual active bridge converter is re-determined and executed until the working efficiency of the dual active bridge converter meets the preset conditions. When determining the control strategy at the current moment, the method uses the working parameters and voltage ratio at the current moment, and based on the actual data in the working process, it can determine a control strategy that is more suitable for the current moment. In this way, the execution of the control strategy will be more targeted, and after each execution of the control strategy, the preset condition corresponding to the working efficiency is used as the stop condition of the iterative step, which can reduce the control time of the dual active bridge converter and improve the working efficiency of the dual active bridge converter.

[0081] From the analysis process of the above embodiment, it can be seen that the key to improving the working efficiency of the dual active bridge converter is to obtain the control strategy of the dual active bridge converter in each iteration process. Then, in one embodiment, Figure 8 As shown, the specific content of the control strategy for determining the dual active bridge converter according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the operation of the dual active bridge converter is introduced, and the specific content includes:

[0082] S301, determining a target voltage ratio between a primary side and a secondary side of a transformer of a dual active bridge converter during operation based on a voltage ratio at a current moment and an operating parameter at a current moment.

[0083] The target voltage ratio between the primary side and the secondary side of the transformer represents the ratio of the output voltage to the input voltage of the DAB converter at the target efficiency.

[0084] In an embodiment of the present application, the controller can search for a target voltage ratio that matches the current moment from a preset parameter database based on the working parameters at the current moment and the voltage ratio at the current moment. Alternatively, the controller can also determine the voltage ratio increment at the current moment according to the voltage ratio at the current moment. And the sum of the voltage ratio at the current moment and the voltage ratio increment is used as the target voltage ratio. Alternatively, the controller can also use a gradient descent algorithm to determine the target voltage ratio that matches the current moment. The embodiment of the present application does not limit the method for determining the target voltage ratio.

[0085] S302, calculating the target output power of the dual active bridge converter according to the target voltage ratio.

[0086] In the embodiment of the present application, after obtaining the target voltage ratio, the controller can determine the target output voltage and target output current of the dual active bridge converter based on the input voltage, input current and target voltage ratio, and then calculate the product of the target output voltage and the target output current, and use the product as the target output power of the dual active bridge converter.

[0087] S303, determining a control strategy of the dual active bridge converter according to the target voltage ratio and the target output power.

[0088] In an embodiment of the present application, the controller can analyze the level of the target voltage ratio and the target output power, and based on the level analysis result, search the control strategy that matches the level analysis result from the strategy database. Alternatively, the controller can also map the target voltage ratio and the target output power based on the mapping relationship between the voltage ratio, the output power and the control strategy, and determine the control strategy corresponding to the target voltage ratio and the target output power. The embodiment of the present application does not limit the process of determining the control strategy of the dual active bridge converter according to the target voltage ratio and the target output power.

[0089] In the above dual active bridge converter control method, based on the voltage ratio at the current moment and the working parameters at the current moment, the target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation is determined; according to the target voltage ratio, the target output power of the dual active bridge converter is calculated; according to the target voltage ratio and the target output power, the control strategy of the dual active bridge converter is determined. This method can accurately determine the working efficiency at the current moment through the voltage ratio at the current moment and the working parameters at the current moment, so as to determine the difference between the working efficiency at the current moment and the target working efficiency, and accurately obtain the target voltage ratio. Based on the analysis of the target voltage ratio and the corresponding target output power, the control strategy applicable to the current moment can be accurately obtained.

[0090] Next, the specific content of the control strategy for determining the dual active bridge converter according to the target voltage ratio and the target output power is introduced through an embodiment. Fig. 9 As shown, the specific content includes the following steps:

[0091] S401, obtaining a comparison result between a target voltage ratio and a preset threshold.

[0092] The preset threshold may be a threshold determined based on historical experience, or a threshold corresponding to a required target work efficiency.

[0093] In an embodiment of the present application, the controller may compare the target voltage ratio with a preset threshold value, and the comparison result obtained includes: the target voltage ratio is greater than the preset threshold value, or the target voltage ratio is less than or equal to the preset threshold value.

[0094] S402: Determine a control strategy for the dual active bridge converter based on the comparison result and the range of the target output power.

[0095] In an embodiment of the present application, the controller can analyze the target output power based on a preset power range to determine the range of the target output power. Based on the comparison result and the range of the target output power, a control strategy that matches it is searched from a strategy database, and the control strategy that matches it is used as the control strategy of the dual active bridge converter. Alternatively, the controller can also input the comparison result and the range of the target output power into a preset strategy prediction model, analyze the comparison result and the range of the target output power through the strategy prediction model, and predict the control strategy of the dual active bridge converter.

[0096] In one embodiment, the specific content of determining the control strategy of the dual active bridge converter based on the comparison result and the range of the target output power is described, and the specific content includes:

[0097] If the comparison result is that the target voltage ratio is greater than the preset threshold value and the target output power is within the first range, a first control strategy of the dual active bridge converter is obtained based on the first mapping relationship;

[0098] If the comparison result is that the target voltage ratio is greater than the preset threshold value and the target output power is within the second range, a second control strategy of the dual active bridge converter is obtained based on the second mapping relationship;

[0099] If the comparison result is that the target voltage ratio is less than or equal to the preset threshold value, and the target output power is in a third range, a third control strategy of the dual active bridge converter is obtained based on a third mapping relationship;

[0100] If the comparison result is that the target voltage ratio is less than or equal to the preset threshold, and the target output power is in a fourth range, a fourth control strategy of the dual active bridge converter is acquired based on a fourth mapping relationship.

[0101] In the embodiment of the present application, the control strategy of the dual active bridge converter includes a single phase shift control strategy, a multiple phase shift control strategy or a combined frequency modulation control strategy. Taking the triple phase shift control strategy as an example, there are three main control quantities, namely, the internal phase shift angle D1 of the two bridge arms S1 and S3, S2 and S4 in the primary full bridge of the dual active bridge converter, the external phase shift angle D2 of the primary and secondary bridge arms, and the internal phase shift angle D3 of the two bridge arms Q1 and Q3, Q2 and Q4 in the secondary full bridge. Triple phase shift control is performed based on the internal phase shift angle D1, the external phase shift angle D2 and the internal phase shift angle D3.

[0102] Taking the preset threshold value as 1 and k as the target voltage ratio as an example, when k>1, In the case of, the inner phase shift angle D1 and the inner phase shift angle D3 in the first control strategy can be expressed as:

[0103]

[0104] The external shift phase angle D2 in the first control strategy can be expressed as:

[0105] D2=(k-1)(1-D1)

[0106] When k>1, In the case of, the inner phase shift angle D1 in the second control strategy can be expressed as:

[0107]

[0108] The external phase shift angle D2 and the internal phase shift angle D3 in the second control strategy can be expressed as:

[0109]

[0110] When k≤1, 0≤p<2(k-k2), the inner phase shift angle D1 in the third control strategy can be expressed as:

[0111]

[0112] The outer phase shift angle D2 in the third control strategy is zero, and the inner phase shift angle D3 can be expressed as:

[0113] D3=kD1-k+1

[0114] When k≤1, 2(k-k2)≤p<1, the inner phase shift angle D1 in the fourth control strategy is zero, and the outer phase shift angle D2 can be expressed as:

[0115]

[0116] The internal phase shift angle D3 in the fourth control strategy can be expressed as:

[0117] D3=2kD2-D2-k+1

[0118] Furthermore, different primary and secondary voltage combinations are formed through control strategies composed of different internal phase shift angles D1, external phase shift angles D2, and internal phase shift angles D3. Based on different combinations of primary and secondary voltages, a total of 12 operating modes will be generated. After obtaining the internal phase shift angle D1, external phase shift angle D2, and internal phase shift angle D3 in the control strategy of the dual active bridge converter, it is determined whether the internal phase shift angle D1, external phase shift angle D2, and internal phase shift angle D3 in the control strategy meet the first condition or the second condition. If the first condition is met, the control strategy is determined to correspond to mode 1; if the second condition is met, the control strategy is determined to correspond to mode 2.

[0119] The first condition can be expressed as: 0≤D1≤D2, 0≤D2≤1-D3, 0≤D3≤1

[0120] The second condition can be expressed as: D2≤D1≤D2+D3, 0≤D2≤1-D3, 0≤D3≤1

[0121] In the two operating modes of Mode 1 and Mode 2, due to the different sizes of the inner phase shift angle D1 and the outer phase shift angle D2, the waveforms of the voltages across the inductors in the dual active bridge converter in one cycle are different, resulting in different current waveforms.

[0122] The target voltage ratio k in the dual active bridge converter is Ui / (n*U0), fs is the switching frequency of the switch tube in the dual active bridge converter, L is the inductance, and the current value i of the inductor in the dual active bridge converter in a steady-state switching cycle in mode 1 is L (t) can be expressed as:

[0123]

[0124] The current value i of the inductor in the dual active bridge converter in a steady-state switching cycle in mode 2 L (t) can be expressed as:

[0125]

[0126] Based on the above formula, the maximum current value of the inductor in the dual active bridge converter in mode 1 and mode 2 can be expressed as:

[0127]

[0128] It can be seen that through the triple phase shift control strategy, the current of the adjusted inductor can be obtained, and the inductor voltage can be determined based on the current of the inductor to calculate the power of the inductor. There is a corresponding relationship between the power of the inductor and the output power, that is, the output current or the input current is the current from the inductor, and the inductor current changes positively and negatively. It is converted into input current or output current through the full-bridge circuit in the dual active bridge converter, and then converted into output power. Alternatively, the output current and output voltage of the dual active bridge converter can be directly collected, and the output power can be determined based on the collected output current and output voltage. Based on the ratio of output power to input power, the working efficiency at the current moment is determined. And based on the working efficiency at the current moment and the preset conditions, it is determined whether to continue to execute the iterative step.

[0129] Based on the first condition, the second condition and the above analysis process, it can be known that the inner phase shift angle D1 is less than or equal to 1, and the current of the inductor is linearly related to the target voltage ratio k. The larger the k value, the larger the current of the inductor.

[0130] The above processes are based on Figure 2 The equivalent circuit diagram in the figure is analyzed, ignoring the influence of the actual parameter values ​​on the circuit. Fig.10 The equivalent circuit diagram of the full-bridge DAB converter is shown in Figure 2. Figure 2 ,A nonlinear impedance Z is added to the equivalent circuit diagram, which requires nonlinear ,control to correct the effect of the actual parameter value on the ,working efficiency in real time.

[0131] In the above dual active bridge converter control method, a comparison result between the target voltage ratio and the preset threshold is obtained; based on the comparison result and the range of the target output power, the control strategy of the dual active bridge converter is determined. The method analyzes the target voltage ratio and the target output power by preset thresholds and power ranges, and can accurately obtain the control strategy of the dual active bridge converter.

[0132] There are many ways to obtain the target voltage ratio between the primary and secondary sides of the transformer during the operation of the dual active bridge converter. The following describes the various methods one by one.

[0133] In the first case, the target voltage ratio can be searched in a preset parameter database. Next, a specific method for searching the target voltage ratio in a preset parameter database is introduced through an embodiment. The specific content of determining the target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation based on the voltage ratio at the current moment and the working parameters at the current moment includes:

[0134] Based on the voltage ratio at the current moment and the working parameters at the current moment, a voltage ratio matching the dual active bridge converter is searched from a preset parameter database, and the matching voltage ratio is used as a target voltage ratio.

[0135] The preset parameter database stores target voltage ratios that match different operating parameters and different voltage ratios. The voltage ratio at the current moment is adjusted to the target voltage ratio to improve the working efficiency of the dual active bridge converter.

[0136] In an embodiment of the present application, the controller can search for a voltage ratio that matches the current moment in a preset parameter database based on the voltage ratio at the current moment and the working parameters at the current moment, and use the voltage ratio that matches the current moment as the target voltage ratio.

[0137] Furthermore, the control process of the dual active bridge converter is described in detail through a detailed embodiment. Fig.11 As shown, the control process includes: S11: obtaining the transformation ratio n of the transformer in the dual active bridge converter, and taking n as the initial voltage ratio; S12: detecting the output voltage U0 of the dual active bridge converter;

[0138] S13: Determine whether the output voltage U0 is within the allowable range to prevent the output voltage from being too large and causing safety hazards; S14: Determine a new voltage ratio (i.e., the target voltage ratio of the first iteration process) based on the working parameters of the dual active bridge converter at the current moment and the initial voltage ratio; S15: Determine the control strategy at the current moment based on the new voltage ratio, and execute the control strategy; S16: Determine whether the work efficiency meets the preset conditions after the first iteration is completed. If not, continue to execute step S13; if it does, or if it does after multiple iterations, end the control process.

[0139] In the above dual active bridge converter control method, based on the voltage ratio at the current moment and the working parameters at the current moment, a voltage ratio matching the dual active bridge converter is searched from a preset parameter database, and the matching voltage ratio is used as a target voltage ratio. By searching the preset parameter database, the method can quickly find a voltage ratio matching the dual active bridge converter based on two actual data, the voltage ratio at the current moment and the working parameters at the current moment, thereby quickly obtaining the target voltage ratio.

[0140] In the second case, the current operating parameters can be adjusted step by step with a preset step size to obtain the target voltage ratio. Fig.12 As shown, the specific contents of determining the target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation based on the voltage ratio at the current moment and the working parameters at the current moment include:

[0141] S501, based on the working parameters at the current moment, obtaining the voltage ratio increment between the primary side and the secondary side of the transformer of the dual active bridge converter at the current moment.

[0142] In the embodiment of the present application, if the dual active bridge converter control includes multiple iterations, the voltage ratio increment in each iteration process may be the same. Alternatively, the voltage ratio increment may be increased or decreased based on the current operating parameters in each iteration process.

[0143] For any iteration process, when the working parameters at the current moment are obtained, the controller can determine the efficiency difference between the working efficiency at the current moment and the target working efficiency through the working parameters at the current moment. If the efficiency difference is large, the voltage ratio increment at the current moment can be set larger; if the efficiency difference is small, the voltage ratio increment at the current moment can be set smaller. Alternatively, based on the mapping relationship between the efficiency difference and the voltage ratio increment, the voltage ratio increment between the primary and secondary sides of the transformer of the dual active bridge converter at the current moment can be obtained. The above voltage ratio increment can be represented by Δk.

[0144] S502: taking the sum of the voltage ratio increment at the current moment and the voltage ratio at the current moment as the target voltage ratio.

[0145] In the embodiment of the present application, after obtaining the voltage ratio increment at the current moment, the controller can add the voltage ratio increment at the current moment to the voltage ratio at the current moment, and use the addition result as the target voltage ratio. The target voltage ratio k' can be expressed as: k'=k+Δk.

[0146] Furthermore, the control process of the dual active bridge converter is described in detail through a detailed embodiment. Fig.13 As shown, the control process includes: S21: obtaining the transformation ratio n of the transformer in the dual active bridge converter, and taking n as the initial voltage ratio; S22: adjusting the initial voltage ratio by the voltage ratio increment Δk to obtain a new voltage ratio; S23: determining the control strategy at the current moment based on the new voltage ratio, and executing the control strategy; S24: judging whether the output voltage U0 is within the allowable range; if it is within the allowable range, executing the step of S24; if it is not within the allowable range, re-executing step S22; S25: calculating the work efficiency after the first iteration is completed; S26: judging whether the work efficiency after the first iteration is completed meets the preset conditions, if not, continuing to execute step S23; if it is satisfied, or after multiple iterations, the control process is terminated.

[0147] In the above dual active bridge converter control method, based on the working parameters at the current moment, the voltage ratio increment between the primary side and the secondary side of the dual active bridge converter transformer at the current moment is obtained; the sum of the voltage ratio increment at the current moment and the voltage ratio at the current moment is used as the target voltage ratio. In each iteration, based on the working parameters of the dual active bridge converter at the current moment in the current iteration, the voltage ratio increment is determined, and based on the voltage ratio increment, the target voltage ratio can be accurately obtained.

[0148] In the third case, the database search can also be integrated with the preset step size to improve the accuracy and efficiency of obtaining the target voltage ratio. Fig.14 As shown, the specific contents of determining the target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation based on the voltage ratio at the current moment and the working parameters at the current moment include:

[0149] S601, based on the voltage ratio at the current moment and the working parameters at the current moment, searching for a voltage ratio matching the dual active bridge converter from a preset parameter database, and taking the matching voltage ratio as a candidate voltage ratio.

[0150] In an embodiment of the present application, the controller can search for a voltage ratio that matches the current moment in a preset parameter database based on the voltage ratio at the current moment and the working parameters at the current moment, and use the voltage ratio that matches the current moment as a candidate voltage ratio.

[0151] S602, based on the working parameters at the current moment, obtaining the voltage ratio increment between the primary side and the secondary side of the transformer of the dual active bridge converter at the current moment.

[0152] In an embodiment of the present application, when the working parameters at the current moment are obtained, the controller can determine the efficiency difference between the working efficiency at the current moment and the target working efficiency through the working parameters at the current moment. If the efficiency difference is large, the voltage ratio increment at the current moment can be set larger; if the efficiency difference is small, the voltage ratio increment at the current moment can be set smaller. Alternatively, based on the mapping relationship between the efficiency difference and the voltage ratio increment, the voltage ratio increment between the primary side and the secondary side of the transformer of the dual active bridge converter at the current moment can be obtained.

[0153] S603: Taking the sum of the voltage ratio increment at the current moment and the candidate voltage ratio as the target voltage ratio.

[0154] In the embodiment of the present application, after obtaining the voltage ratio increment at the current moment, the controller may add the voltage ratio increment at the current moment to the candidate voltage ratio, and use the addition result as the target voltage ratio.

[0155] In the above dual active bridge converter control method, based on the voltage ratio at the current moment and the working parameters at the current moment, a voltage ratio matching the dual active bridge converter is searched from a preset parameter database, and the matching voltage ratio is used as a candidate voltage ratio; based on the working parameters at the current moment, the voltage ratio increment between the primary and secondary sides of the dual active bridge converter transformer at the current moment is obtained; and the sum of the voltage ratio increment at the current moment and the candidate voltage ratio is used as the target voltage ratio. The method first searches the parameter database to quickly determine the candidate voltage ratio that is close to the target voltage ratio. On this basis, further adjustment is made based on a step-by-step adjustment method, so that the target voltage ratio can be quickly and accurately obtained.

[0156] In the fourth case, after obtaining the voltage ratio and working parameters at the current moment, the loss p at the current moment is calculated, and the loss p is related to the working efficiency. The loss p of the dual active bridge converter represents the difference between the input power pi and the output power p0.

[0157] And establish a stochastic gradient descent algorithm. The formula of the stochastic gradient descent algorithm can be expressed as: Where k(t) represents the target voltage ratio after the tth iteration, a(t) is the step size, and p(k) is the function of the target voltage ratio k and the loss p. It is the gradient of the function p(k), which indicates the rate and direction of change of the function at that point. The gradient is used to update the model parameters.

[0158] Specifically, during the update process, the stochastic gradient descent algorithm is first initialized, for example, k(0)=1, step size a=0.01, U0=k0*Ui;Then based on the output voltage U0, calculate the loss p(k); Then calculate the gradient The target voltage ratio k(t+1) is updated. The above steps are repeated until a predetermined number of iterations or convergence condition is reached.

[0159] The above embodiments are all introductions to various methods of obtaining the target voltage ratio. After obtaining the target voltage ratio, the target output power of the dual active bridge converter needs to be calculated based on the target voltage ratio. Fig.15 As shown, the specific contents of the process include:

[0160] S701, calculating the product of the target voltage ratio and the input voltage of the dual active bridge converter, and using the product as the target output voltage of the dual active bridge converter.

[0161] In the embodiment of the present application, the voltage ratio is the ratio of the output voltage of the dual active bridge converter to the input voltage. Then, for the target voltage ratio, the controller multiplies the target voltage ratio by the input voltage of the dual active bridge converter, and the product obtained is the target output voltage of the dual active bridge converter.

[0162] S702: Taking the product of the target output voltage and the target output current as the target output power of the dual active bridge converter.

[0163] In the embodiment of the present application, power represents the product of voltage and current. Then, for the target output voltage, the controller can calculate the product of the target output voltage and the target output current, and the obtained product represents the target output power of the dual active bridge converter.

[0164] In the above dual active bridge converter control method, the product of the target voltage ratio and the input voltage of the dual active bridge converter is calculated, and the product is used as the target output voltage of the dual active bridge converter; the product of the target output voltage and the target output current is used as the target output power of the dual active bridge converter. The method accurately calculates the target output voltage based on the input voltage of the dual active bridge converter through the voltage ratio of the transformer; and then accurately calculates the target output power of the dual active bridge converter through the power calculation formula, the target output voltage and the target output current.

[0165] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0166] Based on the same inventive concept, the embodiment of the present application also provides a dual active bridge converter control device for implementing the dual active bridge converter control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations of one or more dual active bridge converter control device embodiments provided below can refer to the limitations of the dual active bridge converter control method above, and will not be repeated here.

[0167] In an exemplary embodiment, Fig.16As shown, a dual active bridge converter control device is provided, comprising: a first determination module 11, an execution module 12 and a second determination module 13, wherein:

[0168] The first determination module 11 is used to determine the control strategy of the dual active bridge converter according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the operation of the dual active bridge converter;

[0169] An execution module 12, used for executing a control strategy on the dual active bridge converter;

[0170] The second determination module 13 is used to re-determine and execute a new control strategy for the dual active bridge converter when the working efficiency of the dual active bridge converter after the control strategy is executed does not meet the preset conditions, until the working efficiency of the dual active bridge converter meets the preset conditions.

[0171] In an exemplary embodiment, the first determination module includes: a ratio determination unit, a calculation unit and a strategy determination unit, wherein:

[0172] A ratio determination unit, used to determine a target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation based on the voltage ratio at the current moment and the operating parameters at the current moment;

[0173] A calculation unit, used for calculating a target output power of the dual active bridge converter according to a target voltage ratio;

[0174] The strategy determination unit is used to determine the control strategy of the dual active bridge converter according to the target voltage ratio and the target output power.

[0175] In an exemplary embodiment, the strategy determination unit is further configured to obtain a comparison result between the target voltage ratio and a preset threshold value; and determine a control strategy of the dual active bridge converter based on the comparison result and a range of the target output power.

[0176] In an exemplary embodiment, the above-mentioned strategy determination unit is also used to obtain a first control strategy of the dual active bridge converter based on a first mapping relationship when the comparison result is that the target voltage ratio is greater than a preset threshold and the target output power is in a first range; if the comparison result is that the target voltage ratio is greater than the preset threshold and the target output power is in a second range, then the second control strategy of the dual active bridge converter is obtained based on the second mapping relationship; if the comparison result is that the target voltage ratio is less than or equal to the preset threshold and the target output power is in a third range, then the third control strategy of the dual active bridge converter is obtained based on the third mapping relationship; if the comparison result is that the target voltage ratio is less than or equal to the preset threshold and the target output power is in a fourth range, then the fourth control strategy of the dual active bridge converter is obtained based on the fourth mapping relationship.

[0177] In an exemplary embodiment, the ratio determination unit is also used to search for a voltage ratio that matches the dual active bridge converter from a preset parameter database based on the voltage ratio at the current moment and the operating parameters at the current moment, and use the matching voltage ratio as the target voltage ratio.

[0178] In an exemplary embodiment, the ratio determination unit is also used to obtain the voltage ratio increment between the primary and secondary sides of the transformer of the dual active bridge converter at the current moment based on the working parameters at the current moment; and take the sum of the voltage ratio increment at the current moment and the voltage ratio at the current moment as the target voltage ratio.

[0179] In an exemplary embodiment, the ratio determination unit is also used to search for a voltage ratio that matches the dual active bridge converter from a preset parameter database based on the voltage ratio at the current moment and the operating parameters at the current moment, and use the matching voltage ratio as a candidate voltage ratio; based on the operating parameters at the current moment, obtain the voltage ratio increment between the primary and secondary sides of the transformer of the dual active bridge converter at the current moment; and use the sum of the voltage ratio increment at the current moment and the candidate voltage ratio as the target voltage ratio.

[0180] In an exemplary embodiment, the above-mentioned calculation unit is also used to calculate the product of the target voltage ratio and the input voltage of the dual active bridge converter, and use the product as the target output voltage of the dual active bridge converter; and use the product of the target output voltage and the target output current as the target output power of the dual active bridge converter.

[0181] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0182] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A dual active bridge converter control method, characterized in that: The method comprises: Determine the control strategy of the dual active bridge converter according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the operation of the dual active bridge converter; executing the control strategy on the dual active bridge converter; If the working efficiency of the dual active bridge converter after the control strategy is executed does not meet the preset conditions, a new control strategy of the dual active bridge converter is re-determined and executed until the working efficiency of the dual active bridge converter meets the preset conditions.

2. The method according to claim 1, characterized in that Determining the control strategy of the dual active bridge converter according to the voltage ratio between the primary side and the secondary side of the transformer at the current moment and the working parameters at the current moment during the operation of the dual active bridge converter includes: Determining a target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation based on the voltage ratio at the current moment and the operating parameters at the current moment; Calculating the target output power of the dual active bridge converter according to the target voltage ratio; A control strategy for the dual active bridge converter is determined according to the target voltage ratio and the target output power.

3. The method according to claim 2, characterized in that Determining the control strategy of the dual active bridge converter according to the target voltage ratio and the target output power includes: Obtaining a comparison result between the target voltage ratio and a preset threshold; Based on the comparison result and the range of the target output power, a control strategy of the dual active bridge converter is determined.

4. The method according to claim 3, characterized in that Determining the control strategy of the dual active bridge converter based on the comparison result and the range of the target output power includes: If the comparison result is that the target voltage ratio is greater than the preset threshold value, and the target output power is within a first range, obtaining a first control strategy of the dual active bridge converter based on a first mapping relationship; If the comparison result is that the target voltage ratio is greater than the preset threshold value, and the target output power is within a second range, obtaining a second control strategy of the dual active bridge converter based on a second mapping relationship; If the comparison result is that the target voltage ratio is less than or equal to the preset threshold value, and the target output power is in a third range, obtaining a third control strategy of the dual active bridge converter based on a third mapping relationship; If the comparison result is that the target voltage ratio is less than or equal to the preset threshold, and the target output power is in a fourth range, a fourth control strategy of the dual active bridge converter is acquired based on a fourth mapping relationship.

5. The method according to any one of claims 2 to 4, characterized in that: The determining, based on the voltage ratio at the current moment and the operating parameters at the current moment, a target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation, comprises: Based on the voltage ratio at the current moment and the operating parameters at the current moment, a voltage ratio matching the dual active bridge converter is searched from a preset parameter database, and the matching voltage ratio is used as the target voltage ratio.

6. The method according to any one of claims 2 to 4, characterized in that: The determining, based on the voltage ratio at the current moment and the operating parameters at the current moment, a target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation, comprises: Based on the working parameters at the current moment, obtaining a voltage ratio increment between the primary side and the secondary side of the transformer of the dual active bridge converter at the current moment; The sum of the voltage ratio increment at the current moment and the voltage ratio at the current moment is taken as the target voltage ratio.

7. The method according to any one of claims 2 to 4, characterized in that: The determining, based on the voltage ratio at the current moment and the operating parameters at the current moment, a target voltage ratio between the primary side and the secondary side of the transformer of the dual active bridge converter during operation, comprises: Based on the voltage ratio at the current moment and the operating parameters at the current moment, searching a voltage ratio matching the dual active bridge converter from a preset parameter database, and using the matching voltage ratio as a candidate voltage ratio; Based on the working parameters at the current moment, obtaining a voltage ratio increment between the primary side and the secondary side of the transformer of the dual active bridge converter at the current moment; The sum of the voltage ratio increment at the current moment and the candidate voltage ratio is used as the target voltage ratio.

8. The method according to any one of claims 2 to 4, characterized in that: Calculating the target output power of the dual active bridge converter according to the target voltage ratio includes: Calculating the product of the target voltage ratio and the input voltage of the dual active bridge converter, and using the product as the target output voltage of the dual active bridge converter; The product of the target output voltage and the target output current is used as the target output power of the dual active bridge converter.

9. A controller, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

10. An energy storage power supply, characterized in that: The energy storage power supply comprises the controller and the dual active bridge converter in claim 9.

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