Interleaved parallel dc-dc converter, control method, fuel cell current injection method

Abstract

The application provides a kind of staggered parallel DCDC converter and its control method, belongs to alternating current injection technical field.The DCDC converter includes: the converter includes multiple DCDC lines and controller, wherein each DCDC line includes inductor, upper bridge arm power tube and lower bridge arm power tube, current sensor;The one end of inductor is used to connect with the positive pole of power supply, the other end of inductor is connected with the one end of upper bridge arm power tube, the other end of the upper bridge arm power tube of each DCDC line is connected with each other, for output positive phase voltage, the one end of lower bridge arm power tube is connected with the one end of upper bridge arm power tube, the other end of the lower bridge arm power tube of each DCDC line is connected with each other, for connecting with the negative pole of power supply, current sensor is connected with the other end of upper bridge arm power tube, controller is connected with the control end of each upper bridge arm power tube and lower bridge arm power tube, the other end of each inductor, current sensor.

Description

Technical Field

[0001] This invention relates to the field of alternating current injection technology, and more specifically to an interleaved parallel DC-DC converter and its control method. Background Technology

[0002] In battery stack and DC-DC converter systems, the DC-DC converter needs to control the DC current output by the stack. Simultaneously, in applications involving AC impedance analysis and detection of the battery stack, the DC-DC converter also needs to inject AC current into the stack at a given frequency and amplitude. The AC current control performance of the DC-DC converter is crucial for AC impedance analysis of the battery stack and the stable operation of the battery stack system.

[0003] Traditional AC current control methods for battery stacks include: (a) AC current control based on a single-channel DC-DC converter topology, which suffers from large current ripple at the switching frequency; (b) AC current control based on a multi-channel parallel DC-DC converter topology and a PI algorithm, where the PI algorithm is difficult to achieve precise AC current control over a wide frequency range; and (c) AC current control based on a multi-channel parallel DC-DC converter topology and a single-channel PIR algorithm, which suffers from coupling effects between currents in actual operation, making it difficult for single-channel PIR control to achieve precise control of AC current frequency and amplitude. Summary of the Invention

[0004] The purpose of this invention is to provide an interleaved parallel DC-DC converter and its control method, which can achieve precise control of the frequency and amplitude of the AC current.

[0005] To achieve the above objectives, embodiments of the present invention provide an interleaved parallel DC-DC converter, the converter including multiple DC-DC lines and a controller, wherein each DC-DC line includes an inductor, an upper bridge power transistor, a lower bridge power transistor, and a current sensor;

[0006] One end of the inductor is connected to the positive terminal of the power supply, and the other end of the inductor is connected to one end of the upper bridge arm power transistor. The other ends of the upper bridge arm power transistors of each DC-DC circuit are interconnected to output a positive phase voltage. One end of the lower bridge arm power transistor is connected to one end of the upper bridge arm power transistor, and the other ends of the lower bridge arm power transistors of each DC-DC circuit are interconnected to connect to the negative terminal of the power supply. The current sensor is connected to the other end of the upper bridge arm power transistor. The controller is connected to the control terminals of each upper and lower bridge arm power transistor, the other end of each inductor, and the current sensor. The phase difference of the switching carrier signal between two adjacent DC-DC circuits is... And n is the number of DC-DC lines.

[0007] On the other hand, the present invention also provides a control method for an interleaved parallel DC-DC converter, the control method comprising:

[0008] Obtain the current command required by the system;

[0009] The DC and AC components are determined based on the current command;

[0010] Determine whether to activate each DC-DC line to output the DC component;

[0011] The AC component is input into a random DC-DC circuit to output the AC component.

[0012] Optionally, the control method further includes:

[0013] A first switching command is generated using a PIR control method based on the superimposed current of the DC component and the current collected by the current sensor, or based on the superimposed current of the DC component, the AC component, and the current collected by the current sensor.

[0014] A second switching instruction is generated based on the first switching instruction using a PWM control model;

[0015] The upper bridge arm power transistor and the lower bridge arm power transistor are controlled according to the second switch command.

[0016] Optionally, the transfer function of the PIR control method is given by formula (1).

[0017]

[0018] Among them, G PIR Let k be the transfer function. p k i and k r These are the gain parameters of the PIR control method, where s is the Laplace operator and ω is the gain parameter. c ω0 represents the frequency of the PIR control method.

[0019] Optionally, the control method further includes:

[0020] Update the transfer function according to formulas (2) and (3).

[0021] ω0=2πf ac (2)

[0022] ω c =2πk c f ac (3)

[0023] Among them, f ac k is the frequency of the AC component. c Let be the cutoff frequency coefficient of the R controller, and 0.01. <k c <0.1.

[0024] Furthermore, the present invention also provides a fuel cell current injection method, the injection method comprising:

[0025] A pre-configured parallel-interleaved DC-DC converter includes multiple DC-DC lines and a controller. Each DC-DC line includes an inductor, an upper-arm power transistor, a lower-arm power transistor, and a current sensor. One end of the inductor is connected to the positive terminal of the power supply, and the other end of the inductor is connected to one end of the upper-arm power transistor. The other ends of the upper-arm power transistors in each DC-DC line are interconnected to output a positive-phase voltage. One end of the lower-arm power transistor is connected to one end of the upper-arm power transistor, and the other ends of the lower-arm power transistors in each DC-DC line are interconnected to connect to the negative terminal of the power supply. The current sensor is connected to the other end of the upper-arm power transistor. The controller is connected to the control terminals of each upper-arm and lower-arm power transistor, the other end of each inductor, and the current sensor. The phase difference of the switching carrier signals between adjacent DC-DC lines is [missing information]. And n is the number of DC-DC lines;

[0026] Obtain the current command required by the system;

[0027] The DC and AC components are determined based on the current command;

[0028] Determine whether to activate each of the aforementioned DC-DC lines to output the DC component;

[0029] The AC component is input into at least one of the DC-DC lines to output the AC component.

[0030] Optionally, the injection method further includes:

[0031] A first switching command is generated using a PIR control method based on the superimposed current of the DC component and the current collected by the current sensor, or based on the superimposed current of the DC component, the AC component, and the current collected by the current sensor.

[0032] A second switching instruction is generated based on the first switching instruction using a PWM control model;

[0033] The upper bridge arm power transistor and the lower bridge arm power transistor are controlled according to the second switch command.

[0034] Optionally, the transfer function of the PIR control method is Equation (1).

[0035]

[0036] Among them, G PIR Let k be the transfer function. p k i and k r Here, ω represents the gain parameter of the PIR control method, s is the superimposed current of the DC component and the current collected by the current sensor, and ω is the gain parameter of the PIR control method. c ω0 represents the frequency of the PIR control method.

[0037] Optionally, the controller is further configured to:

[0038] Update the transfer function according to formulas (2) and (3).

[0039] ω0=2πf ac (2)

[0040] ω c =2πk c f ac (3)

[0041] Among them, f ac k is the frequency of the AC component. c Let be the cutoff frequency coefficient of the R controller, and 0.01. <k c <0.1.

[0042] In another aspect, the present invention also provides a computer-readable storage medium storing instructions for being read by a machine to cause the machine to perform any of the control methods described above.

[0043] Through the above technical solution, the interleaved parallel DC-DC converter and its control method provided by the present invention, by designing an interleaved parallel multi-channel DC-DC converter circuit, divides the DC component into multiple channels, and then injects the AC component into one of the DC-DC lines, thereby suppressing the switching frequency ripple of the AC current and achieving precise control of the AC component.

[0044] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0045] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is a circuit diagram of an interleaved parallel DC-DC converter according to an embodiment of the present invention;

[0047] Figure 2 This is a flowchart of a control method for an interleaved parallel DC-DC converter according to an embodiment of the present invention;

[0048] Figure 3 This is a partial flowchart of a control method for an interleaved parallel DC-DC converter according to an embodiment of the present invention.

[0049] Figure 4 This is a partial logic block diagram of a control method for an interleaved parallel DC-DC converter according to an embodiment of the present invention.

[0050] Figure 5 This is a logic block diagram of the transfer function of a PIR controller according to an embodiment of the present invention;

[0051] Figure 6 This is a flowchart of a fuel cell current injection method according to an embodiment of the present invention;

[0052] Figure 7 This is a logic block diagram of the working process of a fuel cell stack according to an embodiment of the present invention;

[0053] Figure 8 This is a flowchart of a fuel cell current injection method according to an embodiment of the present invention;

[0054] Figure 9 This is a logic block diagram of a fuel cell current injection method according to an embodiment of the present invention. Detailed Implementation

[0055] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0056] like Figure 1 The diagram shown is a circuit diagram of an interleaved parallel DC-DC converter according to an embodiment of the present invention. Figure 1 The converter may include multiple DC-DC lines and a controller. Each DC-DC line may include an inductor L (L1…L…). n ), upper bridge arm power transistor S a (S 1a …S na ) and the lower bridge arm power transistor S b (S 1b …S nb), current sensor. One end of the inductor L can be used to connect to the power supply V. pack The positive terminal of the inductor L is connected, and the other end of the inductor L can be connected to the upper bridge arm power transistor S. a One end is connected to the upper arm power transistor S of each DC-DC line. a The other ends can be connected to each other, thus jointly outputting a positive phase voltage, and the lower bridge arm power transistor S... b One end can be connected to the upper arm power transistor S a One end is connected to the lower bridge arm power transistor S of each DC-DC line. b The other end is connected to the power supply V. pack The negative terminal is connected, and the current sensor can be connected to the upper bridge arm power transistor S. a The other end is connected, and the controller can be connected to each upper bridge arm power transistor S. a and lower bridge arm power transistor S b The control terminal, the other end of each inductor L, and the current sensor are connected.

[0057] In such Figure 1 When the DC-DC converter shown is working, the controller can be used to perform actions such as... Figure 2 The method shown. Specifically, in this Figure 2 In this context, the method may include:

[0058] In step S10, the current command required by the system is obtained;

[0059] In step S11, the DC component and AC component are determined according to the current command;

[0060] In step S12, it is determined that each DC-DC line is activated to output a DC component;

[0061] In step S13, an AC component is input into a random DC-DC circuit to output an AC component.

[0062] In such Figure 2 In the method shown, the DC component required by the system is divided into n paths through a multi-channel DC-DC circuit, and the DC component corresponding to each path is... And the upper arm power transistor S between every two adjacent DC-DC lines a Lower bridge arm power transistor S b The switching frequency difference This cancels out the switching frequency ripple between two DC-DC lines with a 180° phase difference in the switching carrier signals, thereby achieving precise control.

[0063] In this embodiment, in order to achieve feedback control and thus improve the control accuracy of the converter, the controller can also be used to perform actions such as... Figure 3The method shown in the diagram. Figure 3 In this context, the method may include:

[0064] In step S20, a first switching command is generated using the PIR control method based on the superimposed current of the DC component and the current collected by the current sensor, or based on the superimposed current of the DC component, the AC component and the current collected by the current sensor.

[0065] In step S21, a second switching instruction is generated using a PWM control model based on the first switching instruction;

[0066] In step S22, the upper bridge arm power transistor and the lower bridge arm power transistor are controlled according to the second switch command.

[0067] How Figure 3 The logic block diagram of the control method shown is as follows: Figure 4 As shown. This PIR control method can be represented as a PIR controller, that is, using a PIR controller as a current loop controller. The m-th channel injects an AC component I... acm For example, the PI controller in the PIR controller achieves precise control of the DC current command, while the resonant R controller achieves precise control of the AC current I in the current command. ac Precise control. Due to the AC current I in the m-th channel. acm It will generate AC harmonics through coupling in other paths. In the PIR controllers of other paths, the PI controller can achieve precise control of the given DC component, while the resonant R controller can achieve current suppression of AC harmonics.

[0068] While various methods known to those skilled in the art can be used for this PIR controller, in a preferred embodiment of the invention, the transfer function of the PIR controller can be expressed as... Figure 5 That is, formula (1),

[0069]

[0070] Among them, G PIR For the transfer function, k p k i and k r These are the gain parameters of the PIR control method, where s is the Laplace operator and ω is the gain parameter. c ω0 represents the frequency of the PIR control method.

[0071] Furthermore, to address frequency variations, the parameters of the resonant R controller can be adjusted according to the frequency of the injected AC component. Specifically, the transfer function can be updated based on formulas (2) and (3).

[0072] ω0=2πf ac (2)

[0073] ω c =2πk c f ac (3)

[0074] Among them, f ac k is the frequency of the AC component. c Let be the cutoff frequency coefficient of the R controller, and 0.01. <k c <0.1.

[0075] On the other hand, the present invention also provides a control method for an interleaved parallel DC-DC converter, such as... Figure 2 As shown. In this Figure 2 In this context, the control method may include:

[0076] In step S10, the current command required by the system is obtained;

[0077] In step S11, the DC component and AC component are determined according to the current command;

[0078] In step S12, it is determined that each DC-DC line is activated to output a DC component;

[0079] In step S13, an AC component is input into a random DC-DC circuit to output an AC component.

[0080] In such Figure 2 In the method shown, the DC component required by the system is divided into n paths through a multi-channel DC-DC circuit, and the DC component corresponding to each path is... And the upper arm power transistor S between every two adjacent DC-DC lines a Lower bridge arm power transistor S b The switching frequency difference This cancels out the switching frequency ripple between two DC-DC lines with a 180° phase difference in the switching carrier signals, thereby achieving precise control.

[0081] In this embodiment, in order to achieve feedback control and thus improve the control accuracy of the converter, the controller can also be used to perform actions such as... Figure 3 The method shown in the diagram. Figure 3 In this context, the method may include:

[0082] In step S20, a first switching command is generated using the PIR control method based on the superimposed current of the DC component and the current collected by the current sensor, or based on the superimposed current of the DC component, the AC component and the current collected by the current sensor.

[0083] In step S21, a second switching instruction is generated using a PWM control model based on the first switching instruction;

[0084] In step S22, the upper bridge arm power transistor and the lower bridge arm power transistor are controlled according to the second switch command.

[0085] How Figure 3 The logic block diagram of the control method shown is as follows: Figure 4 As shown. This PIR control method can be represented as a PIR controller, that is, using a PIR controller as a current loop controller. The m-th channel injects an AC component I... acm For example, the PI controller in the PIR controller achieves precise control of the DC current command, while the resonant R controller achieves precise control of the AC current I in the current command. ac Precise control. Due to the AC current I in the m-th channel. acm It will generate AC harmonics through coupling in other paths. In the PIR controllers of other paths, the PI controller can achieve precise control of the given DC component, while the resonant R controller can achieve current suppression of AC harmonics.

[0086] While various methods known to those skilled in the art can be used for this PIR controller, in a preferred embodiment of the invention, the transfer function of the PIR controller can be expressed as... Figure 5 That is, formula (1),

[0087]

[0088] Among them, G PIR For the transfer function, k p k i and k r These are the gain parameters of the PIR control method, where s is the Laplace operator and ω is the gain parameter. c ω0 represents the frequency of the PIR control method.

[0089] Furthermore, to address frequency variations, the parameters of the resonant R controller can be adjusted according to the frequency of the injected AC component. Specifically, the transfer function can be updated based on formulas (2) and (3).

[0090] ω0=2πf ac (2)

[0091] ω c =2πk c f ac (3)

[0092] Among them, f ac k is the frequency of the AC component. c Let be the cutoff frequency coefficient of the R controller (or resonant R controller), and 0.01 <k c <0.1.

[0093] Furthermore, the present invention also provides a fuel cell current injection method, which may include, for example, Figure 6 The steps are shown. In this Figure 6 In this context, the injection method may include:

[0094] In step S30, an interleaved parallel DC-DC converter is preset. The circuit structure of this DC-DC converter can be as follows: Figure 1 As shown in the previous text, it has already been explained in detail, so it will not be repeated here;

[0095] In step S31, the current command required by the system is obtained;

[0096] In step S32, the DC component and AC component are determined according to the current command;

[0097] In step S33, it is determined that each DC-DC line is activated to output a DC component;

[0098] In step S34, an AC component is input into at least one DC-DC line to output an AC component.

[0099] In this embodiment, the structural block diagram of the working process of the fuel cell stack can be as follows: Figure 7 As shown. In this Figure 7 In this configuration, internal resistance detection is used to determine the current internal resistance, enabling timely disconnection of power supply in case of a fault in the fuel cell stack itself. When this interleaved parallel DC-DC converter is operating, the DC component required by the system load is divided into n paths through multiple DC-DC lines, with each path corresponding to the DC component... And the upper arm power transistor S between every two adjacent DC-DC lines a Lower bridge arm power transistor S b The switching frequency difference This cancels out the switching frequency ripple between two DC-DC lines with a 180° phase difference in the switching carrier signals, thereby achieving precise control.

[0100] In this embodiment, in order to achieve feedback control and thus improve the control accuracy of the converter, the controller can also be used to perform actions such as... Figure 8 The method shown in the diagram. Figure 8 In this context, the method may include:

[0101] In step S40, a first switching command is generated using the PIR control method based on the superimposed current of the DC component and the current collected by the current sensor, or based on the superimposed current of the DC component, the AC component and the current collected by the current sensor.

[0102] In step S41, a second switching instruction is generated using a PWM control model based on the first switching instruction;

[0103] In step S42, the upper bridge arm power transistor and the lower bridge arm power transistor are controlled according to the second switch command.

[0104] How Figure 8 The logic block diagram of the injection method shown is as follows: Figure 9 As shown. This PIR control method can be represented as a PIR controller, that is, using a PIR controller as a current loop controller. The m-th channel injects an AC component I... acm For example, the PI controller in the PIR controller achieves precise control of the DC current command, while the resonant R controller achieves precise control of the AC current I in the current command. ac Precise control. Due to the AC current I in the m-th channel. acm It will generate AC harmonics through coupling in other paths. In the PIR controllers of other paths, the PI controller can achieve precise control of the given DC component. The resonant R controller can achieve precise control of the AC current of its own path on the one hand, and suppress the current of AC harmonics in other paths on the other hand.

[0105] While various methods known to those skilled in the art can be used for this PIR controller, in a preferred embodiment of the invention, the transfer function of the PIR controller can be expressed as... Figure 5 That is, formula (1),

[0106]

[0107] Among them, G PIR For the transfer function, k p k i and k r These are the gain parameters of the PIR control method, where s is the Laplace operator and ω is the gain parameter. c ω0 represents the frequency of the PIR control method.

[0108] Furthermore, to address frequency variations, the parameters of the resonant R controller can be adjusted according to the frequency of the injected AC component. Specifically, the transfer function can be updated based on formulas (2) and (3).

[0109] ω0=2πf ac (2)

[0110] ω c =2πk c f ac (3)

[0111] Among them, f ac k is the frequency of the AC component. cLet be the cutoff frequency coefficient of the R controller (or resonant R controller), and 0.01 <k c <0.1.

[0112] In another aspect, the present invention also provides a computer-readable storage medium storing instructions for being read by a machine to cause the machine to perform any of the control methods described above.

[0113] Through the above technical solution, the interleaved parallel DC-DC converter and its control method provided by the present invention, by designing an interleaved parallel multi-channel DC-DC converter circuit, divides the DC component into multiple channels, and then injects the AC component into one of the DC-DC lines, thereby suppressing the switching frequency ripple of the AC current and achieving precise control of the AC component.

[0114] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0116] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0117] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0118] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0119] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0120] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0121] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0122] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An interleaved parallel DC-DC converter, characterized by, The converter includes multiple DC-DC lines and a controller, wherein each DC-DC line includes an inductor, an upper bridge power transistor, a lower bridge power transistor, and a current sensor. One end of the inductor is connected to the positive terminal of the power supply, and the other end of the inductor is connected to one end of the upper bridge arm power transistor. The other ends of the upper bridge arm power transistors of each DC-DC circuit are interconnected to output a positive phase voltage. One end of the lower bridge arm power transistor is connected to one end of the upper bridge arm power transistor, and the other ends of the lower bridge arm power transistors of each DC-DC circuit are interconnected to connect to the negative terminal of the power supply. The current sensor is connected to the other end of the upper bridge arm power transistor. The controller is connected to the control terminals of each upper and lower bridge arm power transistor, the other end of each inductor, and the current sensor. The phase difference of the switching carrier signal between two adjacent DC-DC circuits is... ,and The number of DC-DC lines; The controller is used for: Obtain the current command required by the system; The DC and AC components are determined based on the current command; Determine whether to activate each of the aforementioned DC-DC lines to output the DC component; The AC component is input into one of the random DC-DC lines to output the AC component; The controller is also used for: A first switching command is generated using a PIR control method based on the superimposed current of the DC component and the current collected by the current sensor, or based on the superimposed current of the DC component, the AC component, and the current collected by the current sensor. A second switching instruction is generated based on the first switching instruction using a PWM control model; The upper bridge arm power transistor and the lower bridge arm power transistor are controlled according to the second switch command.

2. A control method for an interleaved parallel DC-DC converter, used to control the interleaved parallel DC-DC converter as described in claim 1, characterized in that, The control method includes: Obtain the current command required by the system; The DC and AC components are determined based on the current command; Determine whether to activate each DC-DC line to output the DC component; The AC component is input into one of the random DC-DC lines to output the AC component; The control method further includes: A first switching command is generated using a PIR control method based on the superimposed current of the DC component and the current collected by the current sensor, or based on the superimposed current of the DC component, the AC component, and the current collected by the current sensor. A second switching instruction is generated based on the first switching instruction using a PWM control model; The upper bridge arm power transistor and the lower bridge arm power transistor are controlled according to the second switch command.

3. The control method according to claim 2, characterized by, The transfer function of the PIR control method is given by formula (1). ，（1） in, The transfer function is... , and These are the gain parameters of the PIR control method, respectively. For the Laplace operator, , The frequency of the PIR control method is given.

4. The control method according to claim 3, characterized by The control method further includes: Update the transfer function according to formulas (2) and (3). ，（2） ，（3） in, The frequency of the AC component, Let be the cutoff frequency coefficient of the R controller, and .

5. A method of fuel cell current injection, characterized by, The injection method includes: A pre-configured parallel-interleaved DC-DC converter includes multiple DC-DC lines and a controller. Each DC-DC line includes an inductor, an upper-arm power transistor, a lower-arm power transistor, and a current sensor. One end of the inductor is connected to the positive terminal of the power supply, and the other end of the inductor is connected to one end of the upper-arm power transistor. The other ends of the upper-arm power transistors in each DC-DC line are interconnected to output a positive-phase voltage. One end of the lower-arm power transistor is connected to one end of the upper-arm power transistor, and the other ends of the lower-arm power transistors in each DC-DC line are interconnected to connect to the negative terminal of the power supply. The current sensor is connected to the other end of the upper-arm power transistor. The controller is connected to the control terminals of each upper-arm and lower-arm power transistor, the other end of each inductor, and the current sensor. The phase difference of the switching carrier signals between adjacent DC-DC lines is [missing information]. ,and The number of DC-DC lines; Obtain the current command required by the system; The DC and AC components are determined based on the current command; Determine whether to activate each of the aforementioned DC-DC lines to output the DC component; The AC component is input into at least one of the DC-DC lines to output the AC component; The injection method further includes: A first switching command is generated using a PIR control method based on the superimposed current of the DC component and the current collected by the current sensor, or based on the superimposed current of the DC component, the AC component, and the current collected by the current sensor. A second switching instruction is generated based on the first switching instruction using a PWM control model; The upper bridge arm power transistor and the lower bridge arm power transistor are controlled according to the second switch command.

6. The injection method of claim 5, wherein, The transfer function of the PIR control method is given by formula (1). ，（1） in, The transfer function is... , and These are the gain parameters of the PIR control method. The current is the sum of the DC component and the current collected by the current sensor. , The frequency of the PIR control method is given.

7. The injection method of claim 6, wherein, The controller is further used for: Update the transfer function according to formulas (2) and (3). ，（2） ，（3） wherein, is the frequency of the alternating component, is the cutoff frequency coefficient of the R controller, and .

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that are read by a machine to cause the machine to perform the method as described in any one of claims 2 to 4.

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