Adaptive method for target value of bus voltage of inverter, controller and inverter

Abstract

The application provides an adaptive method for a target value of a bus voltage of an inverter, a controller and the inverter. The inverter comprises a bus and an inverter circuit, an input end of the inverter circuit is connected to the bus, and an output end of the inverter circuit is connected to an AC power grid. The method comprises the following steps: obtaining a plurality of sampling values of a modulation wave in a current period; the modulation wave is a waveform used for adjusting an output voltage of the inverter circuit and generated according to the target value of the bus voltage; if a ratio of a first number to a total number is greater than or equal to a first preset percentage, the target value of the bus voltage is controlled to be increased; the first number is a number of the sampling values of the modulation wave in the current period, whose absolute values are greater than a first threshold value; and the total number is a total number of the sampling values of the modulation wave in the current period. The application can realize the self-adaptation of the target value of the bus voltage, avoid the over-modulation phenomenon, avoid the phenomenon that the modulation wave is cut off, and avoid the influence on the power grid harmonics.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inverters, and in particular to a target value self-adaptation method for bus voltage of an inverter, a controller and the inverter. BACKGROUND

[0002] In an inverter, if the target value of the bus voltage is set too high, it will usually have adverse effects on the temperature rise of the devices in the inverter and the overall efficiency, and therefore, the target value of the bus voltage is usually not set too high. This setting method is relatively good in the case of a good power grid condition.

[0003] However, in the case of a poor power grid harmonic condition, if the target value of the bus voltage is set too low, the loop harmonic compensation using the modulation wave is prone to over-modulation, the modulation wave will appear to be cut off, and thus the deterioration of the power grid harmonic is aggravated. SUMMARY

[0004] The embodiments of the present application provide a target value self-adaptation method for bus voltage of an inverter, a controller and the inverter, to solve the problem that in the prior art, in the case of a poor power grid harmonic condition, if the target value of the bus voltage of the inverter is set too low, over-modulation is prone to occur, and thus the deterioration of the power grid harmonic is aggravated.

[0005] In a first aspect, the embodiments of the present application provide a target value self-adaptation method for bus voltage of an inverter, the inverter comprising a bus and an inverter circuit, the input end of the inverter circuit being connected to the bus, and the output end of the inverter circuit being connected to an alternating current power grid; the target value self-adaptation method for bus voltage of the inverter comprising:

[0006] obtaining a plurality of sampling values of a modulation wave in a current period; the modulation wave being a waveform used to adjust the output voltage of the inverter circuit and generated according to the target value of the bus voltage;

[0007] if the ratio of the first number to the total number is greater than or equal to a first preset percentage, controlling the target value of the bus voltage to be increased; the first number being the number of the sampling values of the modulation wave in the current period whose absolute values are greater than a first threshold value; and the total number being the total number of the sampling values of the modulation wave in the current period.

[0008] In a possible implementation, after the plurality of sampling values of the modulation wave in the current period are obtained, the target value self-adaptation method for bus voltage of the inverter further comprises:

[0009] if the ratio of the second number to the total number is greater than or equal to a second preset percentage, controlling the target value of the bus voltage to be decreased; the second number being the number of the sampling values of the modulation wave in the current period whose absolute values are less than a second threshold value; and the second threshold value being less than the first threshold value.

[0010] In a possible implementation, the first threshold value and the second threshold value are determined based on a preset required range of the target value of the bus voltage.

[0011] In a possible implementation, the target value of the bus voltage is controlled to decrease, including:

[0012] The target value of the bus voltage is controlled to decrease by a first preset voltage value.

[0013] In a possible implementation, the target value of the bus voltage is controlled to increase, including:

[0014] The target value of the bus voltage is controlled to increase by a second preset voltage value.

[0015] In a possible implementation, after the target value of the bus voltage is controlled to increase, the target value self-adaption method of the bus voltage of the inverter further includes:

[0016] generating a new modulation wave based on the increased target value of the bus voltage;

[0017] controlling the switch tube in the inverter circuit based on the new modulation wave.

[0018] In a second aspect, an embodiment of the present application provides a target value self-adaption device of a bus voltage of an inverter, the inverter including a bus and an inverter circuit, an input end of the inverter circuit being connected to the bus, and an output end of the inverter circuit being connected to an alternating current power grid; the target value self-adaption device of the bus voltage of the inverter includes:

[0019] an acquisition module, configured to acquire a plurality of sampling values of a modulation wave in a current period; the modulation wave is a waveform generated according to a target value of the bus voltage and used to adjust an output voltage of the inverter circuit;

[0020] an adaptation module, configured to control the target value of the bus voltage to increase if a ratio of a first quantity to a total quantity is greater than or equal to a first preset percentage; the first quantity is a quantity of sampling values of the modulation wave in the current period whose absolute values are greater than a first threshold value; and the total quantity is a total number of the sampling values of the modulation wave in the current period.

[0021] In a third aspect, an embodiment of the present application provides a controller, including a memory and a processor, the memory being used to store a computer program, and the processor being used to call and run the computer program stored in the memory to execute the target value self-adaption method of the bus voltage of the inverter as described in the first aspect or any possible implementation of the first aspect.

[0022] In a fourth aspect, an embodiment of the present application provides an inverter, including a bus, an inverter circuit and a controller as described in the third aspect; an input end of the inverter circuit is connected to the bus, an output end of the inverter circuit is connected to an alternating current power grid; and the inverter circuit is controlled by the controller.

[0023] In a fifth aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the steps of the target value self-adaptation method of the bus voltage of the inverter according to the first aspect or any possible implementation manner of the first aspect.

[0024] The target value self-adaptation method of the bus voltage of the inverter, the controller and the inverter provided by the embodiment of the present application can obtain a plurality of sampling values of the modulation wave in a current period, and if the ratio of the number of the sampling values of the modulation wave in the current period whose absolute values are greater than a first threshold value to the total number is greater than or equal to a first preset percentage, it is indicated that the over-modulation phenomenon occurs or is about to occur. At this time, the target value of the bus voltage is increased, and then the modulation wave is affected, so that the target value of the bus voltage is self-adapted, the over-modulation phenomenon is avoided, the clipping phenomenon of the modulation wave does not occur again, and the influence on the power grid harmonics is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. 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.

[0026] Figure 1 is a flowchart of the target value self-adaptation method of the bus voltage of the inverter provided by the embodiment of the present application;

[0027] Figure 2 is a schematic diagram of the modulation wave in the prior art;

[0028] Figure 3 is a schematic diagram of the modulation wave after the target value self-adaptation method of the bus voltage of the inverter provided by the embodiment of the present application is used;

[0029] Figure 4 is a structural schematic diagram of the target value self-adaptation device of the bus voltage of the inverter provided by the embodiment of the present application;

[0030] Figure 5 is a schematic diagram of the controller provided by the embodiment of the present application. DETAILED DESCRIPTION

[0031] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, technologies, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0032] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be described in conjunction with the accompanying drawings and specific embodiments.

[0033] Referring to Figure 1 which shows an implementation flowchart of the target value self-adaptation method of the bus voltage of the inverter provided by the embodiments of the present application. The execution subject of the target value self-adaptation method of the bus voltage of the inverter described above can be a controller.

[0034] The inverter includes a bus and an inverter circuit, the input end of the inverter circuit is connected to the bus, and the output end of the inverter circuit is connected to an AC power grid. The bus is a DC bus, and the inverter circuit is used to convert DC power into AC power. The inverter can also include other circuits, such as a DC-DC conversion circuit, the output end of the DC-DC conversion circuit is connected to the bus, etc., which are not specifically limited here.

[0035] The target value self-adaptation method of the bus voltage of the inverter described above includes:

[0036] In S101, a plurality of sampling values of a modulation wave in a current period are obtained; the modulation wave is a waveform used to adjust the output voltage of the inverter circuit, which is generated according to the target value of the bus voltage.

[0037] In the embodiment, a sampling value of the modulation wave can be collected every preset time length, and the preset time length is less than the time length of a single period, which can be a commercial power period. The preset time length can be set according to actual needs, for example, can be determined according to the switching frequency of the inverter circuit.

[0038] In some possible implementation manners, it can be determined when to start collecting and when to stop collecting the sampling values of the modulation wave through zero-crossing point detection of the modulation wave. For example, when the first zero-crossing point of switching from a negative value to a positive value is detected, the collection is started, and a current value of the modulation wave is collected once every preset time length as a sampling value, and when the second zero-crossing point of switching from a negative value to a positive value is detected, the collection is stopped, and the sampling of the modulation wave in a period is completed.

[0039] The target value of the bus voltage is a voltage value to be reached by the bus voltage through corresponding control.

[0040] The modulation wave is generated according to the target value of the bus voltage and is used to adjust the output voltage of the inverter circuit. According to the modulation wave, a driving signal for driving each switch tube in the inverter circuit can be generated, and each switch tube can be controlled by the corresponding driving signal.

[0041] The target value of the bus voltage can be equivalent to the input voltage of the inverter circuit, which is a direct current voltage. The input voltage needs to be converted so that the output voltage of the inverter circuit is an alternating current voltage. The absolute value of the modulation wave can be understood as a duty cycle. The absolute value of the modulation wave is greater than or equal to 0 and less than 1. The target value of the bus voltage multiplied by the real-time value of the modulation wave gives the real-time value of the output voltage of the inverter circuit. Since the alternating current voltage is positive and negative, the modulation wave is also positive and negative.

[0042] Each phase has a corresponding modulation wave. The modulation wave in S101 can be the modulation wave of any phase.

[0043] In S102, if the ratio of the first number to the total number is greater than or equal to the first preset percentage, the target value of the bus voltage is increased. The first number is the number of sampling values of the modulation wave in the current period whose absolute value is greater than the first threshold value. The total number is the total number of sampling values of the modulation wave in the current period.

[0044] In order to ensure that the inverter circuit outputs stable alternating current voltage, the waveform of the modulation wave changes with the change of the target value of the bus voltage. When the target value of the bus voltage is low and the grid harmonic is poor, the peak value of the modulation wave will be large, which will exceed its upper limit value and cause the phenomenon of clipping, i.e., overmodulation. Referring to Figure 2 , Figure 2 When the target value of the bus voltage is low and the grid harmonic is poor, the modulation waves of phase A, phase B and phase C without using the method of the present application are shown in Figure 2 The three waveforms in correspond to the modulation wave of phase A, the modulation wave of phase B and the modulation wave of phase C, respectively. Figure 2 The modulation wave in has the phenomenon of clipping, i.e., overmodulation.

[0045] In order to solve this problem, the present embodiment samples the modulation wave in one period, obtains a plurality of sampling values of the modulation wave in the current period, and obtains the number of sampling values whose absolute value is greater than a first threshold value among all sampling values of the current period as a first number. The total number of all sampling values of the current period is taken as the total number. If it is detected that the ratio of the first number to the total number is greater than or equal to a first preset percentage, it is considered that the target value of the bus voltage is set too low, which causes the overmodulation phenomenon to occur or will occur soon. At this time, the problem of overmodulation can be solved by increasing the target value of the bus voltage.

[0046] The first threshold value is a value between 0 and 1, can be a value less than the upper limit of the absolute value of the modulation wave and close to the upper limit of the absolute value of the modulation wave, and can be set according to actual needs or related experiments. For example, it can be 0.98 or 0.97, etc.

[0047] Since the number of values of the modulation wave close to or greater than the upper limit is small, the first preset percentage is a small value, which can be determined according to actual needs or related experiments. For example, it can be 1%, 2% or 3%, etc.

[0048] The amplitude of the target value of the bus voltage can be determined according to actual needs or related experiments, and is not specifically limited here.

[0049] Figure 3 A schematic diagram of the modulation wave of the three-phase after using the method of the present application is given, and the overmodulation phenomenon does not occur again.

[0050] The embodiment obtains a plurality of sampling values of the modulation wave in the current period. If the ratio of the number of sampling values of the modulation wave in the current period whose absolute value is greater than the first threshold value to the total number is greater than or equal to the first preset percentage, it indicates that the overmodulation phenomenon has occurred or will occur. At this time, the target value of the bus voltage is increased, thereby affecting the modulation wave, and the adaptive target value of the bus voltage can be achieved, the overmodulation phenomenon is avoided, the modulation wave will not appear again, and the influence on the power grid harmonic is avoided.

[0051] In some embodiments, after S101, the target value of the bus voltage of the inverter adaptive method further comprises:

[0052] If the ratio of the second number to the total number is greater than or equal to the second preset percentage, the target value of the bus voltage is decreased; the second number is the number of sampling values of the modulation wave in the current period whose absolute value is less than the second threshold value; and the second threshold value is less than the first threshold value.

[0053] When the target value of the bus voltage is too high, it will bring adverse effects on the device temperature rise and overall efficiency in the inverter, and therefore, the target value of the bus voltage should not be too high.

[0054] In order to solve this problem, the embodiment samples the modulation wave in a period, obtains a plurality of sampling values of the modulation wave in the current period, and obtains the number of sampling values whose absolute value is less than the second threshold value as the second number. If it is detected that the ratio of the second number to the total number is greater than or equal to the second preset percentage, it is considered that the target value of the bus voltage is set too high, which affects the device temperature rise and overall efficiency, etc. At this time, the problem can be solved by decreasing the target value of the bus voltage.

[0055] The second threshold value is a value between 0 and 1 and is less than the first threshold value. The second threshold value can be a value less than the first threshold value and less than the difference between the first threshold value. The value can be set according to actual needs or related experiments. For example, the value can be 0.96 or 0.95, etc.

[0056] Since the absolute value of the modulation wave is less than the second threshold value, the second preset percentage is a large value, which can be determined according to actual needs or related experiments. For example, the value can be 99%, 98%, 97%, or 96%, etc.

[0057] In some embodiments, the first threshold value and the second threshold value are determined based on a preset demand range of the target value of the bus voltage.

[0058] The preset demand range of the target value of the bus voltage is a range in which the target value of the bus voltage is desired to be located. Through the preset demand range, the size of the first threshold value and the second threshold value can be determined through experiments or related calculations, etc.

[0059] For example, the lower limit value of the preset demand range of the target value of the bus voltage can be a preset lower limit value, and the upper limit value can be a preset upper limit value. That is, the target value of the bus voltage is greater than or equal to the preset lower limit value and less than or equal to the preset upper limit value.

[0060] In some embodiments, the above control of the decrease of the target value of the bus voltage includes:

[0061] The target value of the bus voltage is controlled to decrease by a first preset voltage value.

[0062] In some embodiments, in the above S102, the above control of the increase of the target value of the bus voltage includes:

[0063] The target value of the bus voltage is controlled to increase by a second preset voltage value.

[0064] The first preset voltage value and the second preset voltage value can be equal or not equal, and both are small values. For example, the first preset voltage value and the second preset voltage value can both be 3V, or the first preset voltage value can be 3V and the second preset voltage value can be 2V, etc. The first preset voltage value and the second preset voltage value can be determined according to actual needs or related experiments.

[0065] In some embodiments, in the above S102, after the target value of the bus voltage is increased, the target value of the bus voltage of the inverter adaptive method further includes:

[0066] Based on the increased target value of the bus voltage, a new modulation wave is generated;

[0067] Based on the new modulation wave, the switching tube in the inverter circuit is controlled.

[0068] The embodiment can generate a new modulation wave according to the target value of the raised bus voltage and the required range of the output voltage of the inverter circuit, generate a driving signal for controlling each switch tube in the inverter circuit based on the new modulation wave, and control the corresponding switch tube according to the corresponding driving signal.

[0069] In some possible implementations, after the target value of the bus voltage is lowered, the target value self-adaption method of the bus voltage of the inverter further includes:

[0070] generating a new modulation wave based on the lowered target value of the bus voltage;

[0071] controlling the switch tube in the inverter circuit based on the new modulation wave.

[0072] The target value self-adaption method of the bus voltage of the inverter provided by the embodiment can be executed in each cycle or once every several cycles, which is not specifically limited here.

[0073] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0074] The following is a device embodiment of the application, and for details not described in detail, reference can be made to the corresponding method embodiments described above.

[0075] Figure 4 A structure diagram of the target value self-adaption device of the bus voltage of the inverter provided by the embodiment of the application is shown, only the parts related to the embodiment of the application are shown for the convenience of description, and the details are as follows:

[0076] The inverter includes a bus and an inverter circuit, the input end of the inverter circuit is connected to the bus, and the output end of the inverter circuit is connected to an alternating current grid. Figure 4 As shown, the target value self-adaption device 30 of the bus voltage of the inverter can include an acquisition module 31 and a self-adaption module 32.

[0077] The acquisition module 31 is configured to acquire a plurality of sampling values of a modulation wave in a current cycle; the modulation wave is a waveform generated according to the target value of the bus voltage and used for adjusting the output voltage of the inverter circuit.

[0078] The self-adaption module 32 is configured to raise the target value of the bus voltage if the ratio of the first number to the total number is greater than or equal to the first preset percentage; the first number is the number of sampling values of the modulation wave in the current cycle whose absolute value is greater than the first threshold value; and the total number is the total number of sampling values of the modulation wave in the current cycle.

[0079] In one possible implementation, the adaptive module 32 is further configured to: after acquiring multiple sample values ​​of the modulated wave in the current period, if the ratio of the second quantity to the total quantity is greater than or equal to a second preset percentage, control the target value of the bus voltage to decrease; the second quantity is the number of times the absolute value of the sample values ​​of the modulated wave in the current period is less than a second threshold; the second threshold is less than a first threshold.

[0080] In one possible implementation, the first threshold and the second threshold are determined based on a preset demand range of the target value of the bus voltage.

[0081] In one possible implementation, in the adaptive module 32, the target value of the control bus voltage is reduced by including:

[0082] The target value of the control bus voltage is reduced by a first preset voltage value.

[0083] In one possible implementation, the target value of the bus voltage is increased in the adaptive module 32, including:

[0084] The target value of the control bus voltage is increased by a second preset voltage value.

[0085] In one possible implementation, in the adaptive module 32, after the target value of the control bus voltage increases, the adaptive method for the target value of the inverter bus voltage further includes:

[0086] Based on the target value of the increased bus voltage, a new modulation wave is generated;

[0087] Based on the new modulation wave, the switching transistors in the inverter circuit are controlled.

[0088] Figure 5 This is a schematic diagram of the controller provided in an embodiment of the present invention. Figure 5 As shown, the controller 4 in this embodiment includes a processor 40 and a memory 41. The memory 41 stores a computer program 42, and the processor 40 calls and runs the computer program 42 stored in the memory 41 to execute the steps in the above embodiments of the adaptive method for the target value of the bus voltage of each inverter, for example... Figure 1 S101 to S102 are shown. Alternatively, the processor 40 is used to call and run the computer program 42 stored in the memory 41 to implement the functions of each module / unit in the above-described device embodiments, for example... Figure 4 The functions of modules / units 31 to 32 shown.

[0089] For example, the computer program 42 can be divided into one or more modules / units stored in the memory 41 and executed by the processor 40 to accomplish the present application. The one or more modules / units can be a series of computer program instruction segments capable of accomplishing specific functions, which are used to describe the execution process of the computer program 42 in the controller 4. For example, the computer program 42 can be divided into the modules / units 31 to 32 shown in the figure. Figure 4 The modules / units 31 to 32 shown in the figure.

[0090] The controller 4 can include, but is not limited to, the processor 40 and the memory 41. Those skilled in the art can understand that the controller 4 can include more or fewer components than those shown in the figure, or combine certain components, or include different components, for example, the controller can also include an input / output device, a network access device, a bus, etc. Figure 4 The controller 4 shown in the figure is only an example and does not constitute a limitation on the controller 4, and the controller 4 can include more or fewer components than those shown in the figure, or combine certain components, or include different components, for example, the controller can also include an input / output device, a network access device, a bus, etc.

[0091] The processor 40 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0092] The memory 41 can be an internal storage unit of the controller 4, for example, a hard disk or a memory of the controller 4. The memory 41 can also be an external storage device of the controller 4, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 41 can include both an internal storage unit and an external storage device of the controller 4. The memory 41 is used to store the computer program and other programs and data required by the controller. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0093] Corresponding to the above controller, the embodiment also provides an inverter, comprising a bus, an inverter circuit and the above controller; an input end of the inverter circuit is connected with the bus, and an output end of the inverter circuit is connected with an AC power grid; the inverter circuit is controlled by the controller.

[0094] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or software. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the application. The specific working process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0095] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0096] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0097] In the embodiments provided by the present application, it should be understood that the disclosed device / controller and method can be implemented in other ways. For example, the above-described device / controller embodiments are only schematic, and the division of the modules or units is only a logical function division, and there can be another division in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or in other forms.

[0098] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0099] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present alone, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0100] The integrated module / unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. When the processor executes the computer program, the steps of each current flow control method embodiment can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable file or some intermediate form, etc. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0101] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method of adaptively setting a target value of a bus voltage of an inverter, characterized by, The inverter comprises a bus and an inverter circuit, an input end of the inverter circuit is connected to the bus, and an output end of the inverter circuit is connected to an AC power grid; and a target value self-adapting method of the bus voltage of the inverter comprises: obtaining a plurality of sampling values of a modulation wave in a current period; the modulation wave is a waveform generated according to the target value of the bus voltage and used to adjust an output voltage of the inverter circuit; if a ratio of a first number to a total number is greater than or equal to a first preset percentage, increasing the target value of the bus voltage; generating a new modulation wave based on the target value of the bus voltage after the increase; and controlling a switch tube in the inverter circuit based on the new modulation wave; the first number is a number of sampling values of the modulation wave in the current period and whose absolute values are greater than a first threshold value; and the total number is a total number of sampling values of the modulation wave in the current period; if a ratio of a second number to the total number is greater than or equal to a second preset percentage, decreasing the target value of the bus voltage; the second number is a number of sampling values of the modulation wave in the current period and whose absolute values are less than a second threshold value; and the second threshold value is less than the first threshold value; the first threshold value and the second threshold value are determined based on a preset required range of the target value of the bus voltage.

2. The method according to claim 1, wherein The method further comprises: decreasing the target value of the bus voltage by a first preset voltage value.

3. The method according to claim 1, wherein The method further comprises: increasing the target value of the bus voltage by a second preset voltage value.

4. An inverter bus voltage target value adaptive device characterized by comprising: A target value self-adapting method of a bus voltage of an inverter is executed, the inverter comprises a bus and an inverter circuit, an input end of the inverter circuit is connected to the bus, and an output end of the inverter circuit is connected to an AC power grid; A target value self-adapting device of a bus voltage of an inverter comprises: an obtaining module, configured to obtain a plurality of sampling values of a modulation wave in a current period; the modulation wave is a waveform generated according to the target value of the bus voltage and used to adjust an output voltage of the inverter circuit; an adapting module, configured to if a ratio of a first number to a total number is greater than or equal to a first preset percentage, increase the target value of the bus voltage; the first number is a number of sampling values of the modulation wave in the current period and whose absolute values are greater than a first threshold value; and the total number is a total number of sampling values of the modulation wave in the current period.

5. A controller characterized by comprising: A device comprises a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute a target value self-adapting method of a bus voltage of an inverter.

6. An inverter, characterized by, An inverter comprises a bus, an inverter circuit and a controller, an input end of the inverter circuit is connected to the bus, an output end of the inverter circuit is connected to an AC power grid, and the inverter circuit is controlled by the controller.

7. A computer-readable storage medium storing a computer program, wherein the computer program comprises the following steps of: The computer program is executed by the processor to implement the steps of the target value self-adapting method of the bus voltage of the inverter.

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