A method for setting voltage of direct current bus of inverter and related components

Abstract

The application discloses an inverter DC bus voltage setting method and related components, which is applied to an inverter comprising a phase-shifted full-bridge converter, a DC bus and a full-bridge inverter circuit. Firstly, the DC bus voltage values of multiple inverters are determined, and then the overall conversion efficiency of the inverter under each DC bus voltage value is determined. The DC bus voltage value with the highest overall conversion efficiency is taken as the optimal DC bus voltage value. Finally, the DC bus voltage is clamped to the optimal DC bus voltage value by controlling the conduction or turn-off of each switch tube in the full-bridge inverter circuit, so that the overall conversion efficiency of the inverter is improved, and the performance of the inverter is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, in particular to an inverter DC bus voltage setting method and related components. BACKGROUND

[0002] At present, a photovoltaic inverter is composed of a phase-shifted full-bridge converter and a full-bridge inverter circuit, and the phase-shifted full-bridge converter and the full-bridge inverter circuit are connected by a DC bus. Figure 1 , Figure 1 is a structural schematic diagram of a photovoltaic inverter in the prior art, wherein the left side is a phase-shifted full-bridge converter, which is provided with an input DC voltage Vin by a photovoltaic module, and the right side is a full-bridge inverter circuit, which is composed of four switching tubes, generates a high-frequency current through high-frequency switching of the switching tubes, and forms an output AC voltage Vout to a power grid after filtering by a filtering circuit. Among them, the phase-shifted full-bridge circuit and the full-bridge inverter circuit can both realize soft switching, reduce the loss of switching, and improve the overall conversion efficiency.

[0003] In the prior art, the voltage on the DC bus is clamped to a fixed value Vlink by controlling the conduction or turn-off of the switching tubes in the full-bridge inverter circuit, but in the actual use process of the photovoltaic inverter, the working conditions of the photovoltaic module change greatly, so the input voltage Vin has a large variation range, and the power grid is generally connected to multiple photovoltaic inverters, which causes the output voltage Vout of the photovoltaic inverter to also be greatly affected by the power grid. Since the input voltage Vin and the output voltage Vout will both have a large variation, the fixed bus voltage value Vlink may sometimes cause the phase-shifted full-bridge circuit and the full-bridge inverter circuit to not work well in the soft switching state, resulting in a decrease in the overall conversion efficiency of the inverter, and may also affect the electromagnetic compatibility and other performances of the inverter. SUMMARY

[0004] The purpose of the present application is to provide an inverter DC bus voltage setting method and related components, which can improve the overall conversion efficiency of the inverter and improve the performance of the inverter.

[0005] To solve the above technical problems, the present application provides an inverter DC bus voltage setting method applied to a processor in an inverter, wherein the inverter further comprises a phase-shifted full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; the input end of the phase-shifted full-bridge converter serves as the input end of the inverter, and the output end of the full-bridge inverter circuit serves as the output end of the inverter.

[0006] The inverter bus voltage setting method comprises:

[0007] determining a plurality of DC bus voltage values;

[0008] determining the overall conversion efficiency of the inverter at each of the DC bus voltage values;

[0009] selecting the DC bus voltage value with the highest overall conversion efficiency of the inverter as the optimal DC bus voltage value;

[0010] controlling the on or off of each of the switching tubes in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value.

[0011] Preferably, the plurality of DC bus voltage values are determined by:

[0012] determining a pre-stored DC bus voltage range of the inverter;

[0013] selecting a plurality of DC bus voltage values within the DC bus voltage range.

[0014] Preferably, the plurality of DC bus voltage values are selected within the DC bus voltage range by:

[0015] selecting a DC bus voltage value every preset value within the DC bus voltage range to obtain a plurality of DC bus voltage values.

[0016] Preferably, the overall conversion efficiency of the inverter at each of the DC bus voltage values is determined by:

[0017] determining the first conversion efficiency of the phase-shifted full-bridge converter at each of the DC bus voltage values;

[0018] determining the second conversion efficiency of the full-bridge inverter circuit at each of the DC bus voltage values;

[0019] multiplying the first conversion efficiency of the phase-shifted full-bridge converter at each of the DC bus voltage values with the second conversion efficiency of the full-bridge inverter circuit at each of the DC bus voltage values to obtain the overall conversion efficiency of the inverter at each of the DC bus voltage values.

[0020] Preferably, the controlling the on or off of each of the switching tubes in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value comprises:

[0021] determining the current voltage of the DC bus;

[0022] generating the driving signals of each of the switching tubes in the full-bridge inverter circuit according to the current voltage of the DC bus and the optimal DC bus voltage value, so as to clamp the voltage of the DC bus to the optimal DC bus voltage value by controlling the on or off of each of the switching tubes in the full-bridge inverter circuit.

[0023] To solve the above technical problems, the application further provides an inverter DC bus voltage setting system, which is applied to a processor in an inverter, the inverter further comprising a phase-shifted full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; an input end of the phase-shifted full-bridge converter serving as an input end of the inverter, an output end of the full-bridge inverter circuit serving as an output end of the inverter, and the processing module being connected with each switch tube in the full-bridge inverter circuit.

[0024] The inverter DC bus voltage setting system comprises:

[0025] a DC bus voltage value determination unit for determining a plurality of DC bus voltage values;

[0026] a total efficiency determination unit for determining the total conversion efficiency of the inverter under each of the DC bus voltage values;

[0027] an optimal DC bus voltage value selection unit for selecting the DC bus voltage value with the highest total conversion efficiency of the inverter as the optimal DC bus voltage value;

[0028] an optimal DC bus voltage value setting unit for controlling the conduction or turn-off of each switch tube in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value.

[0029] To solve the above technical problems, the application further provides an inverter DC bus voltage setting device, which comprises:

[0030] a memory for storing a computer program and a calibration coefficient;

[0031] a processor for executing the computer program to realize the steps of the above-mentioned inverter DC bus voltage setting method.

[0032] To solve the above technical problems, the application further provides a computer readable storage medium, which has a computer program stored thereon, the computer program being executed by a processor to realize the steps of the above-mentioned inverter DC bus voltage setting method.

[0033] To solve the above technical problems, the application further provides an inverter, which comprises a phase-shifted full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; an input end of the phase-shifted full-bridge converter serving as an input end of the inverter, an output end of the full-bridge inverter circuit serving as an output end of the inverter, and further comprising the above-mentioned inverter DC bus voltage setting device.

[0034] The inverter DC bus voltage setting device is used.

[0035] The application provides an inverter DC bus voltage setting method and related components, first, the DC bus voltage values of multiple inverters are determined, then the overall conversion efficiency of the inverters under each DC bus voltage value is determined, the DC bus voltage value with the highest overall conversion efficiency is taken as the optimal DC bus voltage value, and finally the DC bus voltage is clamped to the optimal DC bus voltage value by controlling the conduction or turn-off of each switch tube in the full-bridge inverter circuit, so that the overall conversion efficiency of the inverter is improved, and the performance of the inverter is improved. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the prior art and the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Figure 1 It is a structural schematic diagram of a photovoltaic inverter in the prior art.

[0038] Figure 2 It is a flowchart of an inverter DC bus voltage setting method provided by the present application.

[0039] Figure 3 It is a structural schematic diagram of an inverter DC bus voltage setting system provided by the present application.

[0040] Figure 4 It is a structural schematic diagram of an inverter DC bus voltage setting device provided by the present application. DETAILED DESCRIPTION

[0041] The core of the present application is to provide an inverter DC bus voltage setting method and related components, which can improve the overall conversion efficiency of the inverter and improve the performance of the inverter.

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0043] Please refer to Figure 2 , Figure 2A flow chart of an inverter DC bus voltage setting method provided by the application is applied to a processor in an inverter, the inverter further comprises a phase-shifted full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; the input end of the phase-shifted full-bridge converter is the input end of the inverter, and the output end of the full-bridge inverter circuit is the output end of the inverter; the inverter DC bus voltage setting method comprises:

[0044] S11: determining a plurality of DC bus voltage values;

[0045] S12: determining the overall conversion efficiency of the inverter under each DC bus voltage value;

[0046] S13: selecting the DC bus voltage value with the highest overall conversion efficiency of the inverter as the optimal DC bus voltage value;

[0047] S14: controlling the conduction or turn-off of each switch tube in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value.

[0048] At present, the photovoltaic inverter in the prior art is usually composed of a phase-shifted full-bridge converter and a full-bridge inverter circuit, the phase-shifted full-bridge converter and the full-bridge inverter circuit are connected by a DC bus in the middle, the phase-shifted full-bridge converter is provided with an input DC voltage Vin by a photovoltaic module, the full-bridge inverter circuit generates a high-frequency current through high-frequency switching of four switch tubes, and the output AC voltage Vout is formed after a filtering circuit. Among them, the phase-shifted full-bridge circuit and the full-bridge inverter circuit can both adopt some circuit control methods to realize soft switching, reduce the current when the switch tube is turned on or the voltage when the switch tube is turned off, so as to reduce the switching loss and improve the overall conversion efficiency of the inverter. In the prior art, the voltage on the DC bus is clamped to a fixed value Vlink by controlling the conduction or turn-off of the switch tube in the full-bridge inverter circuit, and in the actual use process of the photovoltaic inverter, the working conditions of the photovoltaic module change greatly, so the input voltage Vin has a large variation range, and the power grid is generally connected with multiple photovoltaic inverters, which leads to that the output voltage Vout of the photovoltaic inverter is also greatly affected by the power grid and fluctuates greatly. Since the input voltage Vin and the output voltage Vout will have a large change, the fixed bus voltage value Vlink may sometimes cause the phase-shifted full-bridge circuit and the full-bridge inverter circuit to not work well in the soft switching state, resulting in a decrease in the overall conversion efficiency of the inverter, and may also affect the electromagnetic compatibility and other performances of the inverter.

[0049] To solve the above problems, in the embodiment, first, multiple DC bus voltage values are determined, then the overall conversion efficiency of the inverter under each DC bus voltage value in the current working state of the inverter is calculated, specifically, the overall conversion efficiency of the inverter under each DC bus voltage value can be calculated according to the current input voltage, input current, output voltage, output current of the inverter and the parameters of the inverter itself, according to the multiple overall conversion efficiencies calculated, the DC bus voltage value corresponding to the highest overall conversion efficiency is selected as the optimal DC bus voltage value, and finally the on-off of the switching tube in the full-bridge inverter circuit is controlled to clamp the voltage on the DC bus to the optimal DC bus voltage value, so it can be seen that by this way, the DC bus voltage value with the highest overall conversion efficiency can be adjusted according to the different working states of the inverter, and the overall conversion efficiency of the inverter is improved.

[0050] It should be noted that the embodiment takes the phase-shifted full-bridge plus full-bridge inverter circuit topology in the photovoltaic inverter as an example, and other similar topologies can also be used in actual use, which is not particularly limited in the present application.

[0051] It should be noted that the embodiment takes the overall conversion efficiency of the inverter as the standard for determining the optimal bus voltage value, and other parameters can also be used to determine the optimal bus voltage value in actual use, which is not particularly limited in the present application.

[0052] In summary, the present application provides an inverter DC bus voltage setting method, first, multiple DC bus voltage values of the inverter are determined, then the overall conversion efficiency of the inverter under each DC bus voltage value is determined, the DC bus voltage value with the highest overall conversion efficiency is selected as the optimal DC bus voltage value, finally, the DC bus voltage is clamped to the optimal DC bus voltage value by controlling the on-off of each switching tube in the full-bridge inverter circuit, so that the overall conversion efficiency of the inverter is improved, and the performance of the inverter is improved.

[0053] On the basis of the above embodiment:

[0054] As a preferred embodiment, the multiple DC bus voltage values are determined, including:

[0055] The pre-stored DC bus voltage range of the inverter is determined;

[0056] Multiple DC bus voltage values are selected in the DC bus voltage range.

[0057] In the embodiment, considering that the DC bus voltage value ranges of different inverters may be different in actual use, the pre-stored DC bus voltage range of the inverter is determined first in the scheme, and multiple DC bus voltage values are selected in the DC bus voltage range, so as to ensure that the selected multiple bus voltage values are within the normal working range of the inverter, increase the feasibility of the scheme, and improve the reliability of the inverter working.

[0058] As a preferred embodiment, the multiple DC bus voltage values in the DC bus voltage range are selected, including:

[0059] The DC bus voltage values are selected every preset value in the DC bus voltage range to obtain the multiple DC bus voltage values.

[0060] In the embodiment, the DC bus range can be segmented to obtain the multiple DC bus voltage values, that is, the DC bus voltage values are selected every preset value in the DC bus range, which is simple and convenient to implement and easy to realize.

[0061] As a preferred embodiment, the overall conversion efficiency of the inverter under each DC bus voltage value is determined, including:

[0062] The first conversion efficiency of the phase-shift full-bridge converter under each DC bus voltage value is determined.

[0063] The second conversion efficiency of the full-bridge inverter circuit under each DC bus voltage value is determined.

[0064] The first conversion efficiency of the phase-shift full-bridge converter under each DC bus voltage value is multiplied by the second conversion efficiency of the full-bridge inverter circuit under each DC bus voltage value to obtain the overall conversion efficiency of the inverter under each DC bus voltage value.

[0065] In the embodiment, considering that the overall conversion efficiency of the inverter is composed of the first conversion efficiency of the phase-shift full-bridge converter and the second conversion efficiency of the full-bridge inverter circuit, the first conversion efficiency of the phase-shift full-bridge converter under each DC bus voltage value and the second conversion efficiency of the full-bridge inverter circuit under each DC bus voltage value are determined first in the scheme, and each first conversion efficiency is multiplied by each second conversion efficiency to obtain the overall conversion efficiency of the inverter under each DC bus voltage value.

[0066] Specifically, the first conversion efficiency of the phase-shift full-bridge converter is determined by the operating frequency of the phase-shift full-bridge converter under different DC bus voltage values. When the operating frequency of the phase-shift full-bridge converter is closer to the resonance frequency, the first conversion efficiency is higher. The resonance frequency is calculated by the transformer parameters in the phase-shift full-bridge converter and the resonance inductance and the resonance capacitance. The transformer parameters include the transformer excitation inductance, the transformer leakage inductance and the transformer turns ratio. The current operating frequency of the phase-shift full-bridge converter is calculated by the input voltage, the input current and the DC bus voltage value of the current inverter. Therefore, according to the input voltage, the input current, the transformer excitation inductance, the transformer leakage inductance, the transformer turns ratio, the resonance frequency and the DC bus voltage value of the phase-shift full-bridge converter, the first conversion efficiency of the phase-shift full-bridge converter under each DC bus voltage value can be calculated.

[0067] In addition, the second conversion efficiency of the full-bridge inverter circuit is related to the operating frequency and the operating current of the full-bridge inverter circuit. According to the output voltage, the output current, the inductance value in the full-bridge inverter circuit and each DC bus voltage value, the switching loss and the inductance loss of the full-bridge inverter circuit under each DC bus voltage value are calculated. The second conversion efficiency of the full-bridge inverter circuit under each DC bus voltage value is determined according to the loss of the device.

[0068] In summary, the overall conversion efficiency of the inverter is divided into the first conversion efficiency of the phase-shift full-bridge converter and the second conversion efficiency of the full-bridge inverter circuit in the embodiment. Finally, the overall conversion efficiency of the inverter is improved, and the performance of the inverter is increased.

[0069] As a preferred embodiment, the conduction or turn-off of each switch tube in the full-bridge inverter circuit is controlled to clamp the voltage of the DC bus to the optimal DC bus voltage value, comprising:

[0070] determining the current voltage of the DC bus;

[0071] generating the driving signal of each switch tube in the full-bridge inverter circuit according to the current voltage of the DC bus and the optimal DC bus voltage value, so as to control the conduction or turn-off of each switch tube in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value.

[0072] In the embodiment, the conduction and turn-off of the switch tube are controlled by generating the driving signal of the switch in the actual use process of the inverter to realize the function of inverting. Therefore, in the scheme, the current voltage of the DC bus is determined first, and then the driving signal of each switch tube in the full-bridge inverter circuit is generated according to the current voltage of the DC bus and the optimal DC bus voltage value, so as to control the conduction or turn-off of each switch tube in the full-bridge inverter circuit. Finally, the voltage of the DC bus is clamped to the optimal DC bus voltage value, which improves the feasibility of the scheme.

[0073] The application further provides an inverter DC bus voltage setting system, please refer to Figure 3 , Figure 3 A structural schematic diagram of an inverter DC bus voltage setting system provided by the application, a processor applied to an inverter, the inverter further comprising a phase-shifted full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; an input end of the phase-shifted full-bridge converter serving as an input end of the inverter, an output end of the full-bridge inverter circuit serving as an output end of the inverter, and a processing module connected with each switch tube in the full-bridge inverter circuit.

[0074] The inverter DC bus voltage setting system comprises:

[0075] A DC bus voltage value determination unit 31 for determining a plurality of DC bus voltage values;

[0076] A total efficiency determination unit 32 for determining a total conversion efficiency of the inverter under each DC bus voltage value;

[0077] An optimal DC bus voltage value selection unit 33 for selecting a DC bus voltage value with the highest total conversion efficiency of the inverter as an optimal DC bus voltage value;

[0078] An optimal DC bus voltage value setting unit 34 for controlling the conduction or turn-off of each switch tube in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value.

[0079] For the introduction of the inverter DC bus voltage setting system provided by the application, please refer to the above method embodiment, which will not be repeated here.

[0080] The application further provides an inverter DC bus voltage setting device, please refer to Figure 4 , Figure 4 A structural schematic diagram of an inverter DC bus voltage setting device provided by the application, comprising:

[0081] A memory 41 for storing a computer program;

[0082] A processor 42 for executing the computer program to realize the steps of the above inverter DC bus voltage setting method.

[0083] For the introduction of the inverter DC bus voltage setting device provided by the application, please refer to the above method embodiment, which will not be repeated here.

[0084] The application further provides a computer readable storage medium, the computer readable storage medium storing a computer program, the computer program being executed by a processor to realize the steps of the above inverter DC bus voltage setting method.

[0085] For the computer readable storage medium provided by the present application, refer to the method embodiments above, and the present application will not be repeated here.

[0086] The present application also provides an inverter, comprising a phase-shift full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; the input end of the phase-shift full-bridge converter is the input end of the inverter, the output end of the full-bridge inverter circuit is the output end of the inverter, and the inverter further comprises the inverter DC bus voltage setting device as described above.

[0087] For the inverter provided by the present application, refer to the method embodiments above, and the present application will not be repeated here.

[0088] It should also be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0089] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An inverter DC bus voltage setting method, characterized by, A processor applied to an inverter, the inverter further comprising a phase-shifted full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; an input end of the phase-shifted full-bridge converter serving as an input end of the inverter, and an output end of the full-bridge inverter circuit serving as an output end of the inverter; The inverter bus voltage setting method comprises: determining a pre-stored DC bus voltage range of the inverter; and selecting DC bus voltage values every preset value within the DC bus voltage range to obtain a plurality of DC bus voltage values; determining the overall conversion efficiency of the inverter under each DC bus voltage value; selecting the DC bus voltage value with the highest overall conversion efficiency of the inverter as the optimal DC bus voltage value; controlling the conduction or turn-off of each switch tube in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value; The determination of the overall conversion efficiency of the inverter under each DC bus voltage value comprises: calculating the first conversion efficiency of the phase-shifted full-bridge converter under each DC bus voltage value according to the input voltage, input current, transformer excitation inductance, transformer leakage inductance, transformer turn ratio, resonant frequency of the phase-shifted full-bridge converter and each DC bus voltage value; calculating the switching loss and inductance loss of the full-bridge inverter circuit under each DC bus voltage value according to the output voltage, output current, inductance value in the full-bridge inverter circuit and each DC bus voltage value, and determining the second conversion efficiency of the full-bridge inverter circuit under each DC bus voltage value according to the loss of the device; and multiplying the first conversion efficiency of the phase-shifted full-bridge converter under each DC bus voltage value with the second conversion efficiency of the full-bridge inverter circuit under each DC bus voltage value to obtain the overall conversion efficiency of the inverter under each DC bus voltage value.

2. The method of claim 1, wherein, The control of the conduction or turn-off of each switch tube in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value comprises: determining the current voltage of the DC bus; generating the driving signal of each switch tube in the full-bridge inverter circuit according to the current voltage of the DC bus and the optimal DC bus voltage value, so as to clamp the voltage of the DC bus to the optimal DC bus voltage value by controlling the conduction or turn-off of each switch tube in the full-bridge inverter circuit.

3. An inverter DC bus voltage setting system, characterized by, A processor applied to an inverter, the inverter further comprising a phase-shifted full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; an input end of the phase-shifted full-bridge converter serving as an input end of the inverter, and an output end of the full-bridge inverter circuit serving as an output end of the inverter, the processor being connected with each switch tube in the full-bridge inverter circuit; The inverter DC bus voltage setting system comprises: a DC bus voltage value determination unit configured to determine a plurality of DC bus voltage values; an overall efficiency determination unit configured to determine the overall conversion efficiency of the inverter under each DC bus voltage value; and The optimal DC bus voltage value selection unit is configured to select a DC bus voltage value with the highest overall conversion efficiency of the inverter as an optimal DC bus voltage value. The optimal DC bus voltage value setting unit is configured to control the conduction or turn-off of each switch tube in the full-bridge inverter circuit to clamp the voltage of the DC bus to the optimal DC bus voltage value. The DC bus voltage value determination unit is specifically configured to determine a pre-stored DC bus voltage range of the inverter, and select DC bus voltage values every preset value in the DC bus voltage range to obtain a plurality of DC bus voltage values. The overall efficiency determination unit is specifically configured to calculate the first conversion efficiency of the phase-shift full-bridge converter under each DC bus voltage value according to the input voltage and input current of the inverter, the transformer excitation inductance, the transformer leakage inductance, the transformer turn ratio, the resonant frequency of the phase-shift full-bridge converter and each DC bus voltage value; calculate the switching loss and inductance loss of the full-bridge inverter circuit under each DC bus voltage value according to the output voltage and output current of the inverter, the inductance value in the full-bridge inverter circuit and each DC bus voltage value, and determine the second conversion efficiency of the full-bridge inverter circuit under each DC bus voltage value according to the loss of the device; and multiply the first conversion efficiency of the phase-shift full-bridge converter under each DC bus voltage value and the second conversion efficiency of the full-bridge inverter circuit under each DC bus voltage value to obtain the overall conversion efficiency of the inverter under each DC bus voltage value.

4. An inverter DC bus voltage setting device characterized by comprising: The memory is configured to store a computer program. The processor is configured to execute the computer program to implement the steps of the inverter DC bus voltage setting method in any one of claims 1 to 2. The computer program is stored on the computer readable storage medium and is executed by the processor to implement the steps of the inverter DC bus voltage setting method in any one of claims 1 to 2.

5. A computer readable storage medium, characterized in that, The inverter DC bus voltage setting device comprises a phase-shift full-bridge converter, a DC bus and a full-bridge inverter circuit connected in sequence; the input end of the phase-shift full-bridge converter is the input end of the inverter, the output end of the full-bridge inverter circuit is the output end of the inverter, and the inverter DC bus voltage setting device is the inverter DC bus voltage setting device in claim 4.

6. An inverter, characterized by, ​

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