An inverter control method, device, medium

Abstract

The application relates to the field of electrical control, and discloses an inverter control method, an inverter control device and a medium, which are applied to an inverter system including multiple cascaded H-bridges, and the method comprises the following steps: acquiring a working electrical signal and a working mode of the inverter system; wherein the working mode includes a ladder wave working mode and a carrier phase shift working mode; judging whether the working state of the inverter system meets a preset condition according to the working electrical signal; if the preset condition is met, acquiring target parameter information of a target cascaded H-bridge, and determining a control signal according to the target parameter information; the target cascaded H-bridge is a cascaded H-bridge currently connected to the inverter system; and controlling the inverter system according to the control signal to switch the working mode. According to the application, when the working state of the inverter system meets the preset condition, the control signal is determined according to the target parameter information of the cascaded H-bridge currently connected to the inverter system to switch the working mode of the inverter system, so that the power transmission efficiency of the system is improved.

Description

Technical Field

[0001] This application relates to the field of electrical control, and in particular to an inverter control method, device, and medium. Background Technology

[0002] H-bridge cascaded multilevel converters achieve high-voltage output by connecting multiple power units in series. Their output typically employs multilevel phase-shifted PWM control to achieve low output voltage harmonics, minimal voltage fluctuations and common-mode voltage, and low torque ripple. Each power unit is physically independent; if a high-voltage output signal is required, simply increase the number of units. Due to its relatively low technical complexity, this implementation method is widely used in various applications, such as energy routers.

[0003] Figure 1 A structural diagram of an energy router provided in this application; as shown Figure 1 As shown, the energy router comprises multiple modules, each consisting of multiple H-bridge drive circuits. The operation of the energy router is controlled by manipulating the on and off times of different switching transistors. Typically, carrier phase shifting is used to control the H-bridge drive circuits. Using carrier phase shifting control to control cascaded H-bridges results in better harmonic characteristics and relatively balanced power transmission across modules. However, the switching frequency is relatively high, leading to higher switching losses and consequently reduced power transmission efficiency.

[0004] Therefore, how to provide a better inverter control method to improve the power transmission efficiency of the system is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide an inverter control method, device, and medium to improve the power transmission efficiency of the system.

[0006] To address the aforementioned technical problems, this application provides an inverter control method applied to an inverter system comprising multiple cascaded H-bridges. The inverter control method includes:

[0007] Acquire the operating electrical signals and operating modes of the inverter system; wherein the operating modes include a stepped wave operating mode and a carrier phase-shifting operating mode;

[0008] Determine whether the operating state of the inverter system meets the preset conditions based on the operating electrical signal;

[0009] If the preset conditions are met, the target parameter information of the target cascaded H-bridge is obtained, and the control signal is determined according to the working mode and the target parameter information; wherein, the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system;

[0010] The inverter system is controlled according to the control signal to switch the operating mode of the inverter system.

[0011] Preferably, the operating electrical signal includes: an operating voltage signal and an operating current signal; correspondingly, determining whether the operating state of the inverter system meets the preset conditions based on the operating electrical signal includes:

[0012] The transmission efficiency and switching loss of the inverter system are determined based on the operating current signal and the operating voltage signal.

[0013] If the transmission efficiency is lower than the transmission efficiency threshold and / or the switching loss is greater than the switching loss threshold, then the operating state of the inverter system is determined to meet the preset conditions.

[0014] Preferably, obtaining the target parameter information of the target cascaded H-bridge includes:

[0015] Obtain the number information of the cascaded H-bridge currently connected to the inverter system;

[0016] The target parameter information is determined based on the numbering information and the parameter record file.

[0017] Preferably, determining the control signal based on the operating mode and the target parameter information includes:

[0018] The switching operating mode of the inverter system is determined based on the operating mode, thereby determining the target type of the control signal, wherein the target type of the control signal includes stepped wave and triangular wave;

[0019] The control signal corresponding to the target type is determined based on the target parameter information.

[0020] Preferably, determining the control signal corresponding to the target type based on the target parameter information includes:

[0021] The on-state voltage of the target cascaded H-bridge is obtained, thereby determining the amplitude and frequency information of the control signal.

[0022] Preferably, after the step of controlling the inverter system according to the control signal to switch the operating mode of the inverter system, the method further includes:

[0023] Determine whether the fluctuation of the operating voltage signal during the switching of the operating mode is greater than the fluctuation threshold;

[0024] If the fluctuation exceeds the threshold, an alarm message is sent to the administrator.

[0025] Preferably, the duration of the carrier phase-shifting mode is an integer multiple of the triangular wave period.

[0026] To address the aforementioned technical problems, this application also provides an inverter control device applied to an inverter system comprising multiple cascaded H-bridges, the inverter control device comprising:

[0027] The acquisition module is used to acquire the operating electrical signals and operating modes of the inverter system; wherein, the operating modes include a stepped wave operating mode and a carrier phase-shifting operating mode;

[0028] The judgment module is used to determine whether the operating state of the inverter system meets the preset conditions based on the operating electrical signal;

[0029] The determining module is used to obtain target parameter information of the target cascaded H-bridge if the preset conditions are met, and to determine a control signal based on the operating mode and the target parameter information; wherein, the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system;

[0030] The control module is used to control the inverter system according to the control signal to switch the operating mode of the inverter system.

[0031] To address the aforementioned technical problems, this application also provides an inverter control device, including a memory for storing computer programs;

[0032] A processor is used to implement the steps of the inverter control method when executing the computer program.

[0033] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the inverter control method.

[0034] This application provides an inverter control method applied to an inverter system including multiple cascaded H-bridges. The inverter control method includes: acquiring the operating electrical signal and operating mode of the inverter system; wherein the operating mode includes a stepped wave operating mode and a carrier phase-shift operating mode; determining whether the operating state of the inverter system meets preset conditions based on the operating electrical signal; if the preset conditions are met, acquiring the target parameter information of the target cascaded H-bridge, and determining a control signal based on the target parameter information; wherein the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system; and controlling the inverter system according to the control signal to switch the operating mode of the inverter system. Therefore, the technical solution provided by this application improves the power transmission efficiency of the system by determining the control signal based on the target parameter information of the cascaded H-bridge currently connected to the inverter system when the operating state of the inverter system meets preset conditions.

[0035] In addition, this application also provides an inverter control device and a medium, which correspond to the above method and have the same effect. Attached Figure Description

[0036] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A structural diagram of an energy router provided in this application;

[0038] Figure 2 A flowchart of an inverter control method provided in an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of carrier phase-shift modulation.

[0040] Figure 4 This is a schematic diagram of the stepped wave modulation principle.

[0041] Figure 5 This is a schematic diagram of switching a stepped wave to a carrier phase shifter.

[0042] Figure 6 A schematic diagram of carrier phase shift switching to a stepped wave;

[0043] Figure 7 This is a structural diagram of an inverter control device provided in an embodiment of this application;

[0044] Figure 8 This is a structural diagram of another inverter control device provided in an embodiment of this application. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0046] The core of this application is to provide an inverter control method, device, and medium to improve the power transmission efficiency of the system.

[0047] The technical solution provided in this application is applied to multi-cascaded H-bridge inverter systems, such as energy routers, to control the switching of each switch in the H-bridge using generated control signals, thereby ensuring the normal operation of the inverter system. In specific implementations, the number of cascaded H-bridge (CHB) modules connected to the grid changes with the grid voltage. This application acquires the inverter system's operating electrical signals and operating modes; the operating modes include stepped wave operating mode and carrier phase-shift operating mode; it determines whether the inverter system's operating state meets preset conditions based on the operating electrical signals; if the preset conditions are met, it acquires the target parameter information of the target cascaded H-bridge and determines the control signal based on the target parameter information; the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system; and it controls the inverter system according to the control signals to switch the inverter system's operating modes. Therefore, the technical solution provided in this application determines the control signal based on the target parameter information of the cascaded H-bridge currently connected to the inverter system when the inverter system's operating state meets preset conditions, thereby switching the inverter system's operating mode and improving the system's power transmission efficiency.

[0048] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Figure 2 This is a flowchart illustrating an inverter control method provided in an embodiment of this application. This inverter control method is applied to an inverter system including multiple cascaded H-bridges, such as... Figure 2 As shown, the inverter control method includes:

[0050] S10: Obtain the operating electrical signal and operating mode of the inverter system; the operating modes include stepped wave operating mode and carrier phase shift operating mode.

[0051] In practical implementation, the stepped-wave operating mode refers to controlling the operation of each H-bridge driver in the inverter system using a stepped-wave control signal, while the carrier phase-shift operating mode refers to determining the triangular wave signal that can drive the H-bridge drivers through a carrier phase-shift algorithm to control the inverter system. The control methods used in both are similar, but the frequency and amplitude of their input control signals differ.

[0052] Figure 3 This is a schematic diagram of carrier phase-shift modulation, such as... Figure 3 As shown, carrier phase shifting is an SPWM method applicable to cascaded multilevel inverters. Its basic principle is that for a single-phase cascaded multilevel inverter composed of n H-bridge units, each H-bridge unit uses a low-switching-frequency SPWM modulation method. The sinusoidal modulation waves of each unit are identical, modulated by n sets of triangular carriers. Each triangular carrier has the same frequency and amplitude, but its phase differs by a fixed angle (the phase difference is usually 2π / n or π / n). This causes the SPWM pulses output by each H-bridge unit to be staggered by a certain angle, greatly increasing the equivalent switching frequency. After superposition, the final output waveform of the inverter is as shown... Figure 3 The voltage curve U is shown in the figure. It should be noted that using carrier phase-shift control to control the cascaded H-bridge results in better harmonic characteristics and relatively balanced power transmission in each module, but the switching frequency is relatively high.

[0053] Figure 4 The diagram shows the principle of stepped wave modulation, as follows: Figure 4 As shown, the stepped wave control method is an SPWM method suitable for cascaded multilevel inverters. Its basic principle is that in the low-frequency section, each low-frequency H-bridge unit turns on at a fixed voltage level, generating a corresponding low-frequency step. Based on the voltage difference between the modulation wave and the low-frequency stepped wave, the turn-on time of the high-frequency module is calculated to compensate for the difference. To reduce the turn-on time difference of the low-frequency module, a "first-on, first-off" strategy is typically used to control the low-frequency stepped wave. Using the stepped wave control method to control the cascaded H-bridge results in a lower switching frequency, lower switching losses, and higher overall efficiency.

[0054] S11: Determine whether the operating status of the inverter system meets the preset conditions based on the working electrical signal;

[0055] S12: If the preset conditions are met, the target parameter information of the target cascaded H-bridge is obtained, and the control signal is determined according to the working mode and the target parameter information; wherein, the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system;

[0056] S13: Control the inverter system according to the control signal to switch the operating mode of the inverter system.

[0057] In practice, by real-time detection of the operating voltage and current signals within the inverter module, when the operating state meets the preset conditions, the system directly switches from the stepped wave control mode to the carrier phase-shift control mode. During peak power periods, the carrier phase-shift control mode is used, and after the peak power period, the system switches back to the stepped wave control algorithm, thereby improving power transmission efficiency and reducing line switching losses.

[0058] It should be noted that before and after the inverter's operating mode switch, due to the presence of multiple H-bridge drive circuits in the circuit, the modules connected to the system before and after the switch may be inconsistent. This can lead to a large voltage difference between the bus capacitor voltage on the back side of the cascaded H-bridge and the total voltage, resulting in large fluctuations in current and voltage signals at the moment of switching, causing system instability. Therefore, the technical solution provided in this application needs to pre-determine the cascaded H-bridge currently connected to the inverter system as the target cascaded H-bridge, and determine the frequency and amplitude of the control signal based on the target parameter information of the target cascaded H-bridge, thereby controlling the inverter system more accurately.

[0059] This application acquires the operating electrical signals and operating modes of the inverter system; the operating modes include stepped wave operating mode and carrier phase-shift operating mode; it determines whether the operating state of the inverter system meets preset conditions based on the operating electrical signals; if the preset conditions are met, it acquires the target parameter information of the target cascaded H-bridge and determines the control signal based on the target parameter information; wherein the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system; and it controls the inverter system according to the control signal to switch the operating mode of the inverter system. Therefore, the technical solution provided by this application improves the power transmission efficiency of the system by determining the control signal based on the target parameter information of the cascaded H-bridge currently connected to the inverter system when the operating state of the inverter system meets preset conditions.

[0060] In specific implementation, the acquired operating electrical signals of the inverter system include: operating voltage signal and operating current signal; correspondingly, determining whether the operating state of the inverter system meets the preset conditions based on the operating electrical signals includes: determining the transmission efficiency and switching loss of the inverter system based on the operating current signal and operating voltage signal; if the transmission efficiency is lower than the transmission efficiency threshold and / or the switching loss is greater than the switching loss threshold, then it is determined that the operating state of the inverter system meets the preset conditions.

[0061] Furthermore, the switching loss power of the inverter can be calculated based on the operating electrical signal. If the switching loss of the inverter under stepped wave control is greater than that under carrier phase-shift control, and the inverter is currently in stepped wave operating mode, then it switches to carrier phase-shift operating mode. Conversely, if the switching loss of the inverter under stepped wave control is less than that under carrier phase-shift control, and the inverter is currently in carrier phase-shift operating mode, then it switches to stepped wave operating mode.

[0062] In a preferred embodiment, obtaining the target parameter information of the target cascaded H-bridge includes: obtaining the numbering information of the cascaded H-bridge currently connected to the inverter system to ensure that the cascaded H-bridges in operation in the inverter system before and after the switch are the same; determining the target parameter information based on the numbering information and the parameter record file, and then determining the corresponding control signal based on the target parameter information to facilitate the control of the inverter system.

[0063] Figure 5 This is a schematic diagram of switching a stepped wave to a carrier phase shift, as shown below. Figure 5 As shown, during switching, a triangular wave is generated based on the step position of each module in the stepped wave. If the stepped modulation wave is between steps 4 and 5, then step 5 is used as the reference point (the first step above the intersection). At 0.002s, the stepped wave switches to carrier phase shift; at 0.008s, the carrier phase shift switches back to the stepped wave. The step difference between two adjacent stepped waves is 90°, and the difference between two adjacent triangular waves is 4*90°. The resulting stepped wave makes the starting point of the triangular waves of modules 2n and 2n+1 the same, with one direction up and the other down. When the carrier phase shift switches back to the stepped wave, the triangular wave returns to its original phase (adjusting the duration of the carrier phase shift or the frequency of the triangular wave). Before switching, modules 1-4 are open under the control of the stepped wave (a split second before 0.002s); after switching to carrier phase shift, modules 1-4 remain open (a split second after 0.002s). The total carrier phase shift duration is an integer multiple of the triangular wave period, so that when the carrier phase shift switches back to the stepped wave (0.008s), the triangular wave returns to its original position, ensuring that the system can work normally before and after the switch. Figure 6 This is a schematic diagram of carrier phase shifting to a stepped wave, a process similar to the one described above.

[0064] It is understandable that determining the control signal based on the operating mode and target parameter information includes: determining the post-switching operating mode of the inverter system based on the operating mode, thereby determining the target type of the control signal; and determining the control signal corresponding to the target type based on the target parameter information. In specific implementation, there are multiple operating modules in the inverter system, and each module contains multiple cascaded H-bridge drive circuits. If it is necessary to switch the H-bridge drive circuit to a stepped wave operating mode, the control signal needs to be switched to a stepped wave; otherwise, the control signal needs to be switched to a triangular wave signal corresponding to the carrier phase-shift operating mode.

[0065] Accordingly, the frequency and amplitude of the control signal are obtained from the parameter information of the activated H-bridge drive circuit. Specifically, determining the control signal corresponding to the target type based on the target parameter information includes: acquiring the on-state voltage of the cascaded H-bridge to be connected to the inverter system, thereby determining the amplitude and frequency information of the control signal. This facilitates control of the cascaded H-bridge according to the control signal, thereby achieving seamless switching between the stepped wave and the phase-shifted carrier. It should be noted that the cascaded H-bridge to be connected to the inverter system provided in this application is the target cascaded H-bridge mentioned earlier, thus ensuring that the cascaded H-bridge connected to the inverter system is consistent after the stepped wave and carrier switching, preventing sudden changes in inverter voltage.

[0066] In practical implementation, to ensure the normal operation of the control system, it is also necessary to monitor the switching results of the inverter so that timely measures can be taken in case of abnormalities. Based on the above embodiment, after the step of controlling the inverter system according to the control signal to switch the inverter system's operating mode, the method further includes: determining whether the fluctuation of the operating voltage signal during the switching of the operating mode is greater than the fluctuation threshold; if it is greater than the fluctuation threshold, sending an alarm message to the management personnel.

[0067] Furthermore, the alarm information should include the switching time, voltage and current amplitudes before and after the switching, and the inverter modules connected to the system before and after the switching. Understandably, to further improve system stability, all successful switching operations can be recorded in the operation log to provide data support for subsequent system maintenance.

[0068] In the above embodiments, the inverter control method has been described in detail. This application also provides embodiments corresponding to the inverter control device. It should be noted that this application describes the embodiments of the device part from two perspectives: one is based on the functional module, and the other is based on the hardware.

[0069] Figure 7 This is a structural diagram of an inverter control device provided in an embodiment of this application. The device is applied to an inverter system including multiple cascaded H-bridges, such as... Figure 7 As shown, the inverter control device includes:

[0070] The acquisition module 10 is used to acquire the operating electrical signals and operating modes of the inverter system; wherein, the operating modes include stepped wave operating mode and carrier phase shift operating mode;

[0071] Judgment module 11 is used to determine whether the working state of the inverter system meets the preset conditions based on the working electrical signal;

[0072] The determination module 12 is used to obtain the target parameter information of the target cascaded H-bridge if the preset conditions are met, and to determine the control signal according to the working mode and the target parameter information; wherein, the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system;

[0073] The control module 13 is used to control the inverter system according to the control signal to switch the working mode of the inverter system.

[0074] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0075] The inverter control device provided in this application includes: acquiring the operating electrical signal and operating mode of the inverter system; wherein the operating mode includes a stepped wave operating mode and a carrier phase-shift operating mode; determining whether the operating state of the inverter system meets preset conditions based on the operating electrical signal; if the preset conditions are met, acquiring the target parameter information of the target cascaded H-bridge, and determining a control signal based on the target parameter information; wherein the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system; and controlling the inverter system according to the control signal to switch the operating mode of the inverter system. Therefore, the technical solution provided in this application improves the power transmission efficiency of the system by determining a control signal based on the target parameter information of the cascaded H-bridge currently connected to the inverter system when the operating state of the inverter system meets preset conditions.

[0076] Figure 8 Another inverter control structure diagram provided in this application embodiment is shown below. Figure 8 As shown, the inverter control device includes: a memory 20 for storing computer programs;

[0077] The processor 21 is used to execute computer programs to implement the steps of the inverter control method as described in the above embodiments.

[0078] The inverter control device provided in this embodiment may include, but is not limited to, smartphones, tablets, laptops, or desktop computers.

[0079] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0080] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, is capable of implementing the relevant steps of the inverter control method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, and the storage method may be temporary or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include, but is not limited to, operating electrical signals, control signals, etc.

[0081] In some embodiments, the inverter control device may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0082] Those skilled in the art will understand that Figure 8 The structure shown does not constitute a limitation on the inverter control device and may include more or fewer components than shown.

[0083] The inverter control device provided in this application includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the following method:

[0084] Acquire the operating electrical signals and operating modes of the inverter system; the operating modes include stepped wave operating mode and carrier phase-shift operating mode;

[0085] Determine whether the operating status of the inverter system meets the preset conditions based on the working electrical signal;

[0086] If the preset conditions are met, the target parameter information of the target cascaded H-bridge is obtained, and the control signal is determined according to the working mode and the target parameter information; wherein, the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system;

[0087] The inverter system is controlled according to the control signal to switch the operating mode of the inverter system.

[0088] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0089] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0090] The inverter control method, apparatus, and medium provided in this application have been described in detail above. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0091] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 a process, method, article, or apparatus. Without further limitations, 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 said element.

Claims

1. An inverter control method, characterized in that, An inverter control method applicable to inverter systems comprising multiple cascaded H-bridges includes: Acquire the operating electrical signals and operating modes of the inverter system; wherein, the operating modes include stepped wave operating mode and carrier phase-shift operating mode; Determine whether the operating state of the inverter system meets the preset conditions based on the operating electrical signal; If the preset conditions are met, the target parameter information of the target cascaded H-bridge is obtained, and the control signal is determined according to the working mode and the target parameter information; wherein, the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system; The inverter system is controlled according to the control signal to switch the operating mode of the inverter system; The operating electrical signal includes: an operating voltage signal and an operating current signal; correspondingly, determining whether the operating state of the inverter system meets the preset conditions based on the operating electrical signal includes: The transmission efficiency and switching loss of the inverter system are determined based on the operating current signal and the operating voltage signal. If the transmission efficiency is lower than the transmission efficiency threshold and / or the switching loss is greater than the switching loss threshold, then the operating state of the inverter system is determined to meet the preset conditions.

2. The inverter control method according to claim 1, characterized in that, The acquisition of target parameter information for the target cascaded H-bridge includes: Obtain the number information of the cascaded H-bridge currently connected to the inverter system; The target parameter information is determined based on the numbering information and the parameter record file.

3. The inverter control method according to any one of claims 1 to 2, characterized in that, The step of determining the control signal based on the operating mode and the target parameter information includes: The switching operating mode of the inverter system is determined based on the operating mode, thereby determining the target type of the control signal, wherein the target type of the control signal includes stepped wave and triangular wave; The control signal corresponding to the target type is determined based on the target parameter information.

4. The inverter control method according to claim 3, characterized in that, The step of determining the control signal corresponding to the target type based on the target parameter information includes: The on-state voltage of the target cascaded H-bridge is obtained, thereby determining the amplitude and frequency information of the control signal.

5. The inverter control method according to claim 1, characterized in that, After the step of controlling the inverter system according to the control signal to switch the operating mode of the inverter system, the method further includes: Determine whether the fluctuation of the operating voltage signal during the switching of the operating mode is greater than the fluctuation threshold; If the fluctuation exceeds the threshold, an alarm message is sent to the administrator.

6. The inverter control method according to claim 1, characterized in that, The duration of the carrier phase-shifting operating mode is an integer multiple of the triangular wave period.

7. An inverter control device, applicable to the control method according to any one of claims 1 to 6, characterized in that, The inverter control device is applied to an inverter system including multiple cascaded H-bridges, and the inverter control device includes: The acquisition module is used to acquire the operating electrical signals and operating modes of the inverter system; wherein, the operating modes include a stepped wave operating mode and a carrier phase-shifting operating mode; The judgment module is used to determine whether the operating state of the inverter system meets the preset conditions based on the operating electrical signal; The determining module is used to obtain target parameter information of the target cascaded H-bridge if the preset conditions are met, and to determine a control signal based on the operating mode and the target parameter information; wherein, the target cascaded H-bridge is the cascaded H-bridge currently connected to the inverter system; The control module is used to control the inverter system according to the control signal to switch the operating mode of the inverter system.

8. An inverter control device, characterized in that, Includes memory used to store computer programs; A processor for executing the computer program to implement the steps of the inverter control method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the inverter control method as described in any one of claims 1 to 6.

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