Control method, inverter, power supply system, control device and readable storage medium

Abstract

The invention provides a control method, an inverter, a power supply system, a control device and a readable storage medium. The control method comprises the following steps: detecting working condition parameters of an inverter; and adjusting the switching frequency and the dead time of the inverter according to the working condition parameters of the inverter. According to the scheme, the switching frequency and the dead time of the inverter can be flexibly adjusted according to the working condition parameters of the inverter, so that the working performance of the inverter can be optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, and more particularly, to a control method, an inverter, a power supply system, a control device and a readable storage medium. BACKGROUND

[0002] With the development of new energy technology, inverters are used more and more widely, and the working conditions of inverters are more and more complex. In the face of complex working conditions, how to optimize the working performance of the inverter is a problem to be solved. SUMMARY

[0003] The present application provides a control method, an inverter, a power supply system, a control device and a readable storage medium to optimize the working performance of the inverter.

[0004] In a first aspect, a control method of an inverter is provided, comprising: detecting a working condition parameter of the inverter; and adjusting a switching frequency and a dead time of the inverter according to the working condition parameter of the inverter.

[0005] Optionally, the working condition parameter of the inverter comprises an AC side voltage of the inverter and / or a bus voltage of the inverter.

[0006] Optionally, the adjusting the switching frequency and the dead time of the inverter according to the working condition parameter of the inverter comprises: in response to the AC side voltage of the inverter being greater than a first threshold value or being less than a second threshold value, adjusting the switching frequency of the inverter from a first switching frequency to a second switching frequency; and in response to the bus voltage being greater than a third threshold value, adjusting the dead time of the inverter from a first dead time to a second dead time.

[0007] Optionally, the first switching frequency is greater than the second switching frequency; and / or, the first dead time is less than the second dead time.

[0008] Optionally, the method further comprises: in response to the bus voltage being greater than a third threshold value, switching an off-path of the inverter from a first off-path to a second off-path, the impedance of the first off-path being less than the impedance of the second off-path.

[0009] Optionally, the method further comprises: in response to the AC side voltage of the inverter being greater than a first threshold value or being less than a second threshold value, adjusting a modulation mode of the inverter from a first modulation mode to a second modulation mode; wherein the switching loss of the first modulation mode is less than the switching loss of the second modulation mode.

[0010] Optionally, the first modulation mode is DPWM, and the second modulation mode is SVPWM.

[0011] In a second aspect, an inverter is provided, comprising: an inverter circuit comprising a plurality of switching tubes; and a controller configured to control the plurality of switching tubes to perform the method according to the first aspect or any one of the implementation forms of the first aspect.

[0012] In a third aspect, an inverter is provided, comprising: a detection module configured to detect an operating parameter of the inverter; and an adjustment module configured to adjust a switching frequency and a dead time of the inverter according to the operating parameter of the inverter.

[0013] Optionally, the operating parameter of the inverter comprises an AC side voltage of the inverter and / or a bus voltage of the inverter.

[0014] Optionally, the adjustment module is configured to: in response to the AC side voltage of the inverter being greater than a first threshold or being less than a second threshold, adjust the switching frequency of the inverter from a first switching frequency to a second switching frequency; and in response to the bus voltage being greater than a third threshold, adjust the dead time of the inverter from a first dead time to a second dead time.

[0015] Optionally, the first switching frequency is greater than the second switching frequency; and / or, the first dead time is less than the second dead time.

[0016] Optionally, the inverter further comprises: a first switching module configured to switch an off path of the inverter from a first off path to a second off path in response to the bus voltage being greater than a third threshold, the first off path having an impedance less than an impedance of the second off path.

[0017] Optionally, the inverter further comprises: a second switching module configured to switch a modulation mode of the inverter from a first modulation mode to a second modulation mode in response to the AC side voltage of the inverter being greater than a first threshold or being less than a second threshold; wherein the first modulation mode has a switching loss less than a switching loss of the second modulation mode.

[0018] Optionally, the first modulation mode is DPWM, and the second modulation mode is SVPWM.

[0019] In a fourth aspect, a power supply system is provided, comprising the inverter according to the second aspect or the third aspect.

[0020] In a fifth aspect, a control device is provided, comprising a processor and a memory, the memory being configured to store programs, instructions or codes, and the processor being configured to execute the programs, instructions or codes in the memory to complete the method according to the first aspect or any one of the implementation forms of the first aspect.

[0021] In a sixth aspect, a computer-readable storage medium is provided storing a computer program, which is loaded by a processor to execute the method as described in the first aspect or any implementation thereof.

[0022] The embodiments of this application can flexibly adjust the switching frequency and dead time of the inverter according to the inverter's operating parameters, thereby helping to optimize the inverter's operating performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application, and other drawings obtained by those skilled in the art based on these drawings fall within the scope of this application.

[0024] Figure 1 This is an example diagram of a system architecture applicable to embodiments of this application.

[0025] Figure 2 This is a flowchart illustrating the control method for an inverter provided in an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the switching path of the inverter provided in the embodiment of this application.

[0027] Figure 4 A circuit diagram of a bridge circuit within an inverter provided in one embodiment of this application.

[0028] Figure 5 A circuit diagram of a bridge circuit within an inverter provided for another embodiment of this application.

[0029] Figure 6 A circuit diagram of a bridge circuit within an inverter provided in yet another embodiment of this application.

[0030] Figure 7 A circuit diagram of a bridge circuit within an inverter provided in yet another embodiment of this application.

[0031] Figure 8 This is a flowchart illustrating a control method for an inverter provided in another embodiment of this application.

[0032] Figure 9 This is an example diagram illustrating the control method of inverter switching frequency provided in an embodiment of this application.

[0033] Figure 10 This is another example diagram illustrating the control method of inverter switching frequency provided in the embodiments of this application.

[0034] Figure 11An example diagram illustrating the method for setting the inverter dead time in an embodiment of this application.

[0035] Figure 12 Another example diagram illustrating the setting method of inverter dead time provided in the embodiments of this application.

[0036] Figure 13 This is a schematic diagram of the structure of an inverter according to an embodiment of this application.

[0037] Figure 14 This is a schematic diagram of the inverter according to another embodiment of this application.

[0038] Figure 15 This is a schematic diagram of the power supply system according to an embodiment of this application.

[0039] Figure 16 This is a schematic diagram of the control device according to an embodiment of this application. Detailed Implementation

[0040] 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, not all, of the embodiments of this application. All other embodiments obtained based on the embodiments of this application are within the scope of protection of this application.

[0041] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0042] It should be understood that the embodiments described below are merely for explaining this application and are not intended to limit this application.

[0043] The embodiments of this application can be applied to photovoltaic power generation scenarios. See also... Figure 1 The photovoltaic power generation system includes photovoltaic modules 12 and an inverter 14. Photovoltaic modules 12 convert solar energy into direct current (DC), and this DC power is transmitted to the inverter 14 via a DC bus between the photovoltaic modules 12 and the inverter 14. After receiving the DC power output from the photovoltaic modules 12, the inverter 14 can convert the DC power into alternating current (AC) and input the AC power into the power grid 20. Alternatively, the inverter 14 can also supply the AC power to a load. It should be understood that... Figure 1 This example uses a photovoltaic power generation system as an illustration only. The embodiments of this application can also be applied to other types of power systems.

[0044] With the development of photovoltaic power generation technology, inverters are being used more and more widely, and their operating conditions are becoming increasingly complex. Optimizing inverter performance in the face of these complex conditions is a problem that needs to be solved.

[0045] The following is combined Figure 2 The control method of the inverter provided in the embodiments of this application will be described in detail.

[0046] See Figure 2 In step S210, the operating parameters of the inverter are detected. These operating parameters may include voltage-related parameters and / or current-related parameters during inverter operation. In some embodiments, the operating parameters may include the AC side voltage and / or the inverter bus voltage. It should be understood that the AC side of the inverter can be connected to the grid or to a load. When the AC side of the inverter is connected to the grid, the AC side voltage may refer to the grid voltage.

[0047] In step S220, the switching frequency and dead time of the inverter are adjusted according to the inverter's operating parameters. This embodiment of the application allows for flexible adjustment of the inverter's switching frequency and dead time based on its operating parameters, thereby optimizing the inverter's performance. For example, if the inverter's switching losses are determined to be too high under a given operating condition based on its operating parameters, the switching frequency can be adjusted to reduce these losses (lower switching frequencies generally result in lower switching losses). Similarly, if the inverter's grid-connected harmonics are determined to be too high under a given operating condition based on its operating parameters, the dead time can be adjusted to reduce the grid-connected harmonics output by the inverter (smaller dead times result in smaller grid-connected harmonics output by the inverter).

[0048] This application does not specifically limit the control method of the inverter based on the inverter's operating parameters. Several possible embodiments are given below.

[0049] For example, in some embodiments, if the inverter's operating parameters indicate that the inverter is in a high-voltage ride-through or low-voltage ride-through period, the inverter will typically take certain measures to maintain its stability. However, such measures often result in higher switching losses. Therefore, if the inverter's operating parameters indicate that the inverter is undergoing a high-voltage ride-through or low-voltage ride-through, the inverter's switching frequency can be adjusted to reduce switching losses. Whether the inverter is in a high-voltage ride-through or low-voltage ride-through period can be determined based on the inverter's AC side voltage (such as the grid voltage). For example, if the inverter's AC side voltage is greater than a first threshold, it indicates that the inverter is in a high-voltage ride-through period. In this case, the inverter's switching frequency can be adjusted from a first switching frequency to a second switching frequency (the first switching frequency can be, for example, greater than the second switching frequency) to reduce the inverter's switching losses. Similarly, if the inverter's AC side voltage is less than a second threshold, it indicates that the inverter is in a low-voltage ride-through period. In this case, the inverter's switching frequency can also be adjusted from a first switching frequency to a second switching frequency to reduce the inverter's switching losses. Of course, in some embodiments, if the inverter's operating parameters indicate that the inverter is not in a high-low voltage transition period (e.g., the AC side voltage of the inverter is less than a first threshold and greater than a second threshold), the inverter's switching frequency can be kept constant (e.g., the inverter's switching frequency is kept at the first switching frequency mentioned above).

[0050] The following example, using a specific scenario where the AC side voltage of the inverter is the grid voltage, provides a more detailed illustration of the above solution.

[0051] As inverter power ratings increase, many inverters need to operate in high-voltage, high-current environments. Furthermore, with the increasing number of grid-connected inverters, the grid environment is becoming increasingly harsh, frequently experiencing voltage fluctuations (such as sudden increases or decreases). These grid voltage fluctuations place higher demands on the system stability of the inverter and the withstand capability of its switching transistors. This ability of the inverter to maintain stable operation is called its high-voltage ride-through capability and low-voltage ride-through capability; that is, the inverter's ability to maintain grid-connected operation and avoid grid disconnection when faced with sudden increases or decreases in grid voltage.

[0052] To improve the high-low voltage surge capability of an inverter, a finer modulation scheme can be used during these periods to enhance control stability. For example, when the grid voltage is below a first threshold but above a second threshold (when the inverter is not in the high-low voltage surge period), a first modulation scheme (such as DPWM) can be used. Once the grid voltage is detected to be above the first threshold or below the second threshold (when the inverter is in the high-low voltage surge period), the inverter's modulation scheme can be switched from the first to a finer second modulation scheme (such as SVPWM). However, a finer modulation scheme typically increases switching losses dramatically, and long-term operation in this manner will reduce the inverter's lifespan. For instance, DPWM clamps the modulation wave of each phase to 0 or 1 for one-third of the power frequency cycle during each switching cycle. This means that the switching transistor of a certain phase will not operate within a switching cycle, thus reducing the number of switching operations and lowering switching losses. However, SVPWM modulates the modulation wave throughout the entire switching cycle, resulting in higher switching losses compared to DPWM, which affects the inverter's lifespan. Therefore, once the grid voltage is detected to be greater than the first threshold or less than the second threshold, the inverter's switching frequency can be adjusted from the first switching frequency to the second switching frequency while adjusting the inverter's modulation mode, so as to reduce the inverter's switching losses.

[0053] In some embodiments, if the inverter's operating parameters indicate that the inverter's bus voltage is too high (e.g., the bus voltage exceeds a third threshold), the electrical stress on the inverter's switching transistors will increase if the inverter's shutdown path is not adjusted, potentially leading to dynamic avalanche phenomena. In some embodiments, to reduce the electrical stress on the switching transistors, a staged shutdown method can be used to control the switching transistors based on the bus voltage. For example, ... Figure 3 As shown, if the inverter bus voltage is less than the third threshold, the inverter is controlled to use the first shutdown path 31; if the inverter bus voltage is greater than the third threshold, the inverter is controlled to use the second shutdown path 32. Assume the impedance of the first shutdown path is R1 and the impedance of the second shutdown path is R2, with R1 being less than R2. When the inverter bus voltage is high, using a larger shutdown path resistor can reduce the electrical stress on the switching transistors, thereby reducing the probability of dynamic avalanche switching.

[0054] As mentioned above, when controlling the inverter using a staged shutdown method, the resistance of the second shutdown path increases. This increases the switching time of the inverter's switching transistors between closed and open states, thus increasing the risk of simultaneous conduction of the upper and lower switching transistors in the inverter's bridge circuit. To mitigate this risk, the inverter's dead time can be increased. While this solution ensures the reliability of the inverter's operation, when using the first shutdown path, such a large dead time is unnecessary. Increasing the dead time can actually lead to increased grid-connected harmonics at the inverter output and increased freewheeling losses in the diodes.

[0055] In some embodiments, if the inverter bus voltage is low (e.g., less than a third threshold), the inverter dead time can be controlled to remain at a first dead time; and / or, if the inverter bus voltage increases (e.g., greater than the third threshold), the inverter dead time can be controlled to adjust from the first dead time to a second dead time (the first dead time is less than the second dead time). Differentiating the dead time based on the DC bus voltage allows the inverter to have lower harmonics over a wider bus voltage range.

[0056] It should be understood that the solutions mentioned above can be used in combination. Several possible combinations are given below.

[0057] For example, in response to the inverter's AC side voltage being greater than a first threshold or less than a second threshold, and the inverter's bus voltage being greater than a third threshold, the inverter is controlled to adjust its switching frequency from a first switching frequency to a second switching frequency, its dead time from a first dead time to a second dead time, and its turn-off path from a first turn-off path to a second turn-off path.

[0058] For example, in response to the inverter's AC side voltage being greater than a first threshold or less than a second threshold, and the inverter's bus voltage being less than a third threshold, the inverter is controlled to adjust its switching frequency from a first switching frequency to a second switching frequency, while maintaining the inverter's dead time at the first dead time and the inverter's turn-off path at the first turn-off path.

[0059] For example, in response to the inverter's AC side voltage being less than a first threshold, the inverter's AC side voltage being greater than a second threshold, and the inverter's bus voltage being greater than a third threshold, the inverter is controlled to maintain the inverter's switching frequency at the first switching frequency, the inverter's dead time is adjusted from the first dead time to the second dead time, and the inverter's turn-off path is adjusted from the first turn-off path to the second turn-off path.

[0060] For example, in response to the inverter's AC side voltage being less than a first threshold, the inverter's AC side voltage being greater than a second threshold, and the inverter's bus voltage being less than a third threshold, the inverter is controlled so that the inverter's switching frequency remains at the first switching frequency and the inverter's dead time remains at the first dead time.

[0061] In some embodiments, the dead time adjustment mentioned above can be controlled by software, without the need for a dedicated hardware dead time setting circuit, thereby reducing the cost and complexity of the inverter.

[0062] This application does not specifically limit the embodiment of the inverter. The inverter can be implemented based on any type of bridge circuit. In other words, the switching frequency and / or dead time settings provided in this application can be applied to any type of bridge circuit. For example, the bridge circuit topology of the inverter provided in this application can adopt... Figure 4 The two-level topology is shown. For example, the bridge circuit topology of the inverter provided in this application embodiment can adopt... Figure 5 The T-type three-level topology is shown. For example, the bridge circuit topology of the inverter provided in this application embodiment can adopt... Figure 6 The active clamp three-level topology is shown. For example, the bridge circuit topology of the inverter provided in this embodiment can adopt... Figure 7 The diode midpoint clamped three-level topology is shown.

[0063] The embodiments of this application are described in more detail below with specific examples. Figure 8 to Figure 12 In this example, the AC side voltage of the inverter is the grid voltage. Figure 8 to Figure 12 In the example, Vnom1 corresponds to the first threshold mentioned earlier, Vnom2 corresponds to the second threshold mentioned earlier, and Vnom3 corresponds to the third threshold mentioned earlier. It should be noted that... Figure 8 to Figure 12 The examples provided are merely to help those skilled in the art understand the embodiments of this application, and are not intended to limit the embodiments of this application to the specific numerical values ​​or specific scenarios illustrated. Figure 8 to Figure 12 The examples are obviously subject to various equivalent modifications or changes, and such modifications or changes also fall within the scope of the embodiments of this application.

[0064] This example provides a method for reducing switching losses during high-low voltage switching and improving long-term inverter reliability by varying the switching frequency and dead-time setting under different inverter conditions. Furthermore, differentiating the dead-time settings can reduce harmonics during grid-connected operation (bus voltage below Vnom3). The overall solution provided in this example can be implemented in software without additional hardware circuitry, making it simple, convenient, and cost-effective.

[0065] It should be noted that the inverter in this example includes three phase arms, and each phase arm can be configured as follows: Figure 8 Follow the setup method shown below. The following will combine... Figure 8 This document provides a detailed description of the setup method for the inverter provided in this example.

[0066] See Figure 8 In step S802, the grid voltage value V and the bus voltage value V1 are sampled in real time.

[0067] In step S804, when the grid voltage V is higher than Vnom1 or lower than Vnom2, it is determined that the inverter is operating in the high-low voltage mode, and step S806 is continued; otherwise, it is determined that the inverter is not operating in the high-low voltage mode, and step S810 is continued.

[0068] In step S806, when the bus voltage V1 is higher than Vnom3, the second shutdown path is activated (e.g., Figure 3 The shutdown path 32 shown has an impedance of R2, which changes the switching frequency of the inverter and adjusts the dead time of the inverter in real time.

[0069] In step S808, when the bus voltage is lower than Vnom3, the first shutdown path is activated (e.g., Figure 3 The shutdown path 31 shown has an impedance of R1 (R1 < R2), and the switching frequency of the inverter is changed.

[0070] In step S810, when the bus voltage is higher than Vnom3, the dead time is adjusted.

[0071] In step S812, when the bus voltage is lower than Vnom3, the inverter switching frequency and dead time are kept constant.

[0072] The following section provides examples illustrating how to adjust dead time and switching frequency.

[0073] First, dead times t1, t2, t3, and t4 can be set, where t3 < t1 and t2 < t4. When it is determined that the inverter has entered the high-low switching state, the switching frequency of the inverter is adjusted from f1 to f2 (f2 is not limited to a fixed value and can be segmented as f2_1, f2_2, etc.). Figure 9 and Figure 10 As shown), this reduces switching losses. At this time, if the bus voltage is lower than Vnom3, the first turn-off path (impedance R1) will be activated, using the first dead time t2+t3 (as shown). Figure 10 (As shown). Otherwise, a second shutdown path can be enabled (impedance R2, R2 > R1), using a second set of dead times t1+t4 (as shown). Figure 11(As shown). When the inverter is not in high / low breakdown mode, the switching frequency remains unchanged. At this time, if the bus voltage is lower than Vnom3, the first shutdown path (impedance R1) can be activated, using the first dead time t2+t3 (as shown). Figure 10 (as shown), otherwise, a second set of dead time t1+t4 can be enabled (as shown). Figure 11 (As shown). By reasonably setting the switching frequency and Vnom3 value, the inverter can achieve high efficiency and low harmonic performance over a wide bus voltage range, and the reliability of the inverter during high-low voltage operation can be guaranteed.

[0074] As described above, in this example, by changing the switching frequency and modifying the dead time setting in different states, the inverter can not only reduce the switching losses of the inverter during high-low voltage transitions and improve the long-term operational reliability, but also achieve lower harmonics over a wider bus voltage range by differentiating the dead time settings. Furthermore, this method can be implemented in software, eliminating the need for complex hardware circuitry.

[0075] Figure 13 This is a schematic diagram of the structure of an inverter provided in one embodiment of this application. Figure 13 As shown, the inverter 1300 includes an inverter circuit 1310 and a controller 1320. The inverter circuit 1310 includes a plurality of switching transistors. The controller 1320 is used to control the plurality of switching transistors to perform the methods provided in any of the preceding embodiments.

[0076] Figure 14 This is a schematic diagram of the structure of an inverter provided in one embodiment of this application. Figure 14 As shown, the inverter 1400 includes a detection module 1410 and an adjustment module 1420. The detection module 1410 is used to detect the operating parameters of the inverter. The adjustment module 1420 is used to adjust the switching frequency and dead time of the inverter according to the operating parameters of the inverter.

[0077] In some embodiments, the operating parameters of the inverter include the AC side voltage of the inverter and / or the bus voltage of the inverter.

[0078] In some embodiments, the adjustment module 1420 is configured to: adjust the switching frequency of the inverter from a first switching frequency to a second switching frequency in response to the AC side voltage of the inverter being greater than a first threshold or less than a second threshold; and adjust the dead time of the inverter from a first dead time to a second dead time in response to the bus voltage being greater than a third threshold.

[0079] In some embodiments, the first switching frequency is greater than the second switching frequency; and / or, the first dead time is less than the second dead time.

[0080] In some embodiments, the inverter 1400 further includes: a first switching module, which, in response to the bus voltage being greater than a third threshold, switches the inverter's shutdown path from a first shutdown path to a second shutdown path, wherein the impedance of the first shutdown path is less than the impedance of the second shutdown path.

[0081] In some embodiments, the inverter 1400 further includes: a second switching module, configured to adjust the modulation mode of the inverter from a first modulation mode to a second modulation mode in response to the AC side voltage of the inverter being greater than a first threshold or less than a second threshold; wherein the switching loss of the first modulation mode is less than the switching loss of the second modulation mode.

[0082] As one possible embodiment, the first modulation method is DPWM and the second modulation method is SVPWM.

[0083] Figure 15 This is a schematic diagram of the power supply system provided in an embodiment of this application. Figure 15 As shown, the power system 1500 includes an inverter 1510. The inverter 1510 may be any of the inverters mentioned in any of the embodiments described above.

[0084] This application provides a control device including a processor and a memory. The memory is used to store programs, instructions, or code, and the processor is used to execute the programs, instructions, or code in the memory to perform the methods described in the foregoing embodiments.

[0085] In this embodiment, please refer to Figure 16 The control device may include a memory 101 and a processor 102. The processor 102 may be connected to the inverter to issue control commands to the inverter's controller. Alternatively, the processor 102 may be connected to the inverter to control the operation of the switching transistors in the inverter. The memory may be random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (EPROM), registers, hard disk, removable disk, etc.

[0086] The memory 101 can store computer instructions. When the computer instructions stored in the memory 101 are executed by the processor 102, the processor 102 can be used to execute the inverter control methods described in the preceding embodiments.

[0087] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape) or a semiconductor medium (e.g., solid-state disk (SSD)).

[0088] This application also provides a readable storage medium for storing the methods or algorithms provided in the above embodiments. Examples include random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (Electronic Programmable ROM), registers, hard disks, removable disks, or any other form of storage medium in the art.

[0089] It is understood that the "connection" in the above embodiments should be understood as "electrical connection" or "communication connection" if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0090] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments of this application, and are not intended to limit the scope of the invention.

[0091] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0092] It is understood that the various embodiments described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0093] Unless otherwise stated, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0094] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0095] The above description is merely a specific embodiment of this application, but the scope of protection of this invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A control method for an inverter, characterized in that, include: Detect the operating parameters of the inverter; Adjust the switching frequency and dead time of the inverter according to the inverter's operating parameters.

2. The method according to claim 1, characterized in that, The operating parameters of the inverter include the AC side voltage of the inverter and / or the bus voltage of the inverter.

3. The method according to claim 2, characterized in that, The step of adjusting the switching frequency and dead time of the inverter according to the inverter's operating parameters includes: In response to the AC side voltage of the inverter being greater than a first threshold or less than a second threshold, the switching frequency of the inverter is adjusted from the first switching frequency to the second switching frequency. In response to the bus voltage being greater than a third threshold, the dead time of the inverter is adjusted from the first dead time to the second dead time.

4. The method according to claim 3, characterized in that: The first switching frequency is greater than the second switching frequency; and / or, The first dead time is shorter than the second dead time.

5. The method according to any one of claims 2 to 4, characterized in that, The method further includes: In response to the bus voltage being greater than a third threshold, the inverter's shutdown path is switched from a first shutdown path to a second shutdown path, wherein the impedance of the first shutdown path is less than the impedance of the second shutdown path.

6. The method according to any one of claims 2 to 4, characterized in that, The method further includes: In response to the AC side voltage of the inverter being greater than a first threshold or less than a second threshold, the modulation mode of the inverter is adjusted from the first modulation mode to the second modulation mode. The switching loss of the first modulation method is less than that of the second modulation method.

7. The method according to claim 6, characterized in that, The first modulation method is DPWM, and the second modulation method is SVPWM.

8. An inverter, characterized in that, include: Inverter circuit, the inverter circuit including multiple switching transistors; A controller for controlling the plurality of switching transistors to perform the method as described in any one of claims 1 to 7.

9. An inverter, characterized in that, include: The detection module is used to detect the operating parameters of the inverter; The adjustment module is used to adjust the switching frequency and dead time of the inverter according to the operating parameters of the inverter.

10. A power supply system, characterized in that, Including the inverter as described in claim 8 or 9.

11. A control device, characterized in that, It includes a processor and a memory, the memory being used to store programs, instructions, or code, and the processor being used to execute the programs, instructions, or code in the memory to perform the method as described in any one of claims 1-7.

12. A computer-readable storage medium, characterized in that, The system contains a computer program that is loaded by a processor to perform the method as described in any one of claims 1-7.

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