Control method and device of inverter circuit, power electronic module and storage medium

Abstract

The application provides a control method and device of an inverter circuit, a power electronic module and a storage medium, and relates to the technical field of power electronics. The method comprises the following steps: acquiring a target angle range of any phase sinusoidal voltage in a multi-phase sinusoidal voltage; determining a to-be-phase-shifted carrier from the multi-phase carrier according to the target angle range and a preset relationship, wherein the preset relationship is used to represent the corresponding relationship between a preset angle range and a preset to-be-phase-shifted carrier; performing phase shift processing on the to-be-phase-shifted carrier to obtain a phase-shifted carrier; and generating a control signal according to the phase-shifted carrier, a non-phase-shifted carrier in the multi-phase carrier and a modulation wave corresponding to the multi-phase carrier, wherein the control signal is used to control the working state of the bridge arm of the inverter circuit. According to the phase-shifted carrier, the non-phase-shifted carrier and the modulation wave corresponding to the multi-phase carrier, the control signal can be generated, so that the generation of the control signal is more convenient, the control signal is used to control the working state of the bridge arm of the inverter circuit, the common-mode voltage of the bridge arm of the inverter circuit is reduced, and the process is simple and effective.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a control method and device of an inverter circuit, a power electronic module and a storage medium. BACKGROUND

[0002] An inverter is a converter that converts direct current power into alternating current power with fixed frequency and voltage or adjustable frequency and voltage. A PWM (Pulse Width Modulation) rectifier is a new type of power converter developed by applying pulse width modulation technology. Inverters and PWM rectifiers are widely used in various industries and fields, and the control of inverters is crucial. Pulse width modulation signals can be used to control inverters or PWM rectifiers.

[0003] In related technologies, the sine modulation wave and the triangular carrier wave are frequently negated in different spatial angle regions to reduce the common mode voltage of the inverter circuit.

[0004] However, in related technologies, the sine modulation wave and the triangular carrier wave are frequently negated to reduce the common mode voltage, and the implementation process is relatively complex. SUMMARY

[0005] The present application aims to solve the above technical problems in related technologies by providing a control method and device of an inverter circuit, a power electronic module and a storage medium.

[0006] To achieve the above-mentioned purposes, the technical solutions adopted by the embodiments of the present application are as follows:

[0007] In a first aspect, the embodiments of the present application provide a control method of an inverter circuit, comprising:

[0008] obtaining a target angle range of any phase sinusoidal voltage in a multi-phase sinusoidal voltage;

[0009] determining a to-be-phase-shifted carrier from a multi-phase carrier according to the target angle range and a preset relationship, the preset relationship being used to represent the corresponding relationship between a preset angle range and a preset to-be-phase-shifted carrier;

[0010] performing phase shift processing on the to-be-phase-shifted carrier to obtain a phase-shifted carrier;

[0011] generating a control signal according to the phase-shifted carrier, a non-phase-shifted carrier in the multi-phase carrier and a modulation wave corresponding to the multi-phase carrier, the control signal being used to control the working state of an inverter circuit bridge arm.

[0012] Optionally, the determining of the to-be-phase-shifted carrier from the multi-phase carrier according to the target angle range and the preset relationship comprises:

[0013] determining a reference carrier from the multi-phase carriers;

[0014] determining the to-be-phase-shifted carrier from the multi-phase carriers according to the target angle range, the reference carrier and the preset relationship.

[0015] Optionally, the target angle range is any one of the following: -30 degrees to 90 degrees, 90 degrees to 210 degrees, 310 degrees to 330 degrees.

[0016] The multi-phase carriers include: a first phase carrier, a second phase carrier, a third phase carrier and a fourth phase carrier.

[0017] Optionally, the reference carrier is the first phase carrier, and the determining the to-be-phase-shifted carrier from the multi-phase carriers according to the target angle range, the reference carrier and the preset relationship includes:

[0018] If the target angle range is -30 degrees to 90 degrees, the second phase carrier and the fourth phase carrier are determined as the to-be-phase-shifted carriers according to the preset relationship, and the first phase carrier and the third phase carrier are the non-phase-shifted carriers.

[0019] If the target angle range is 90 degrees to 210 degrees, the third phase carrier and the fourth phase carrier are determined as the to-be-phase-shifted carriers according to the preset relationship, and the first phase carrier and the second phase carrier are the non-phase-shifted carriers.

[0020] If the target angle range is 310 degrees to 330 degrees, the second phase carrier and the third phase carrier are determined as the to-be-phase-shifted carriers according to the preset relationship, and the first phase carrier and the fourth phase carrier are the non-phase-shifted carriers.

[0021] Optionally, the multi-phase carriers include: a first phase carrier, a second phase carrier, a third phase carrier and a fourth phase carrier, and modulation waves corresponding to the multi-phase carriers include: a first phase modulation wave, a second phase modulation wave, a third phase modulation wave and a fourth phase modulation wave.

[0022] Before the generating the control signal according to the phase-shifted carrier, the non-phase-shifted carrier in the multi-phase carriers and the modulation waves corresponding to the multi-phase carriers, the method further includes:

[0023] determining the fourth phase modulation wave according to the first phase modulation wave, the second phase modulation wave and the third phase modulation wave.

[0024] Optionally, the determining the fourth phase modulation wave according to the first phase modulation wave, the second phase modulation wave and the third phase modulation wave includes:

[0025] averages of the first phase modulation wave, the second phase modulation wave and the third phase modulation wave are taken as the fourth phase modulation wave.

[0026] Optionally, the phase shift processing on the to-be-phase-shifted carrier wave comprises:

[0027] the phase shift processing on the to-be-phase-shifted carrier wave comprises:

[0028] In a second aspect, the present application also provides a control device of an inverter circuit, comprising:

[0029] a obtaining module configured to obtain a target angle range of any phase sinusoidal voltage in a multi-phase sinusoidal voltage;

[0030] a determining module configured to determine a to-be-phase-shifted carrier wave from the multi-phase carrier wave according to the target angle range and a preset relationship, wherein the preset relationship is used to represent a corresponding relationship between a preset angle range and a preset to-be-phase-shifted carrier wave;

[0031] a processing module configured to perform phase shift processing on the to-be-phase-shifted carrier wave to obtain a phase-shifted carrier wave;

[0032] a generating module configured to generate a control signal according to the phase-shifted carrier wave, a non-phase-shifted carrier wave in the multi-phase carrier wave and a modulation wave corresponding to the multi-phase carrier wave, wherein the control signal is used to control an operating state of a bridge arm of an inverter circuit.

[0033] Optionally, the determining module is specifically configured to determine a reference carrier wave from the multi-phase carrier wave, and determine the to-be-phase-shifted carrier wave from the multi-phase carrier wave according to the target angle range, the reference carrier wave and the preset relationship.

[0034] Optionally, the target angle range is any one of the following: -30 degrees to 90 degrees, 90 degrees to 210 degrees, 310 degrees to 330 degrees.

[0035] the multi-phase carrier wave comprises: a first phase carrier wave, a second phase carrier wave, a third phase carrier wave and a fourth phase carrier wave.

[0036] Optionally, the reference carrier wave is the first phase carrier wave, and the determining module is specifically configured to, if the target angle range is -30 degrees to 90 degrees, take the second phase carrier wave and the fourth phase carrier wave as the to-be-phase-shifted carrier wave according to the preset relationship, and take the first phase carrier wave and the third phase carrier wave as the non-phase-shifted carrier wave.

[0037] If the target angle range is 90 degrees to 210 degrees, the third phase carrier and the fourth phase carrier are the to-be-phase-shifted carriers according to the preset relationship, and the first phase carrier and the second phase carrier are the non-phase-shifted carriers.

[0038] If the target angle range is 310 degrees to 330 degrees, the second phase carrier and the third phase carrier are the to-be-phase-shifted carriers according to the preset relationship, and the first phase carrier and the fourth phase carrier are the non-phase-shifted carriers.

[0039] Optionally, the multiple phase carriers include a first phase carrier, a second phase carrier, a third phase carrier and a fourth phase carrier, and the multiple phase carriers correspond to a first phase modulation wave, a second phase modulation wave, a third phase modulation wave and a fourth phase modulation wave.

[0040] The device further includes:

[0041] The first determining module is configured to determine the fourth phase modulation wave according to the first phase modulation wave, the second phase modulation wave and the third phase modulation wave.

[0042] Optionally, the first determining module is specifically configured to take an average value of the first phase modulation wave, the second phase modulation wave and the third phase modulation wave as the fourth phase modulation wave.

[0043] Optionally, the processing module is specifically configured to perform a phase shift of 180 degrees on the to-be-phase-shifted carrier to obtain the phase-shifted carrier.

[0044] In a third aspect, an embodiment of the present application further provides an electric power electronic module, including a memory and a processor, the memory stores a computer program executable by the processor, and the processor implements the control method of the inverter circuit according to any one of the first aspect when executing the computer program.

[0045] In a fourth aspect, an embodiment of the present application further provides a computer readable storage medium, the storage medium stores a computer program, and the computer program is read and executed to implement the control method of the inverter circuit according to any one of the first aspect.

[0046] The beneficial effects of the present application are: the embodiment of the present application provides a control method of an inverter circuit, comprising: obtaining a target angle range of any phase sinusoidal voltage in a multi-phase sinusoidal voltage; determining a to-be-phase-shifted carrier from the multi-phase carrier according to the target angle range and a preset relationship, the preset relationship being used to represent the corresponding relationship between the preset angle range and the preset to-be-phase-shifted carrier; performing phase shift processing on the to-be-phase-shifted carrier to obtain a phase-shifted carrier; and generating a control signal according to the phase-shifted carrier, a non-phase-shifted carrier in the multi-phase carrier and a modulation wave corresponding to the multi-phase carrier, the control signal being used to control the working state of the bridge arm of the inverter circuit. The to-be-phase-shifted carrier is determined from the multi-phase carrier, the phase shift processing is performed on the to-be-phase-shifted carrier to obtain the phase-shifted carrier, and the control signal can be generated according to the phase-shifted carrier, the non-phase-shifted carrier in the multi-phase carrier and the modulation wave corresponding to the multi-phase carrier, so that the generation process of the control signal is more convenient, the control signal can be used to control the working state of the bridge arm of the inverter circuit, the common-mode voltage of the bridge arm of the inverter circuit can be reduced, and the process is simple and the implementation result is effective. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0048] Figure 1 A topological diagram of a three-phase four-bridge-arm two-level converter is provided for the embodiment of the present application.

[0049] Figure 2 A flowchart of a control method of an inverter circuit is provided for the embodiment of the present application Figure 1 .

[0050] Figure 3 A flowchart of a control method of an inverter circuit is provided for the embodiment of the present application Figure 2 .

[0051] Figure 4 A flowchart of a control method of an inverter circuit is provided for the embodiment of the present application Figure 3 .

[0052] Figure 5 A two-level four-bridge-arm voltage vector distribution diagram in the range of -30 degrees to 90 degrees is provided for the embodiment of the present application.

[0053] Figure 6 A three-phase four-bridge-arm carrier phase shift diagram in the range of -30 degrees to 90 degrees is provided for the embodiment of the present application.

[0054] Figure 7 A three-phase four-bridge-arm low common-mode voltage vector distribution diagram in a range of -30 degrees to 90 degrees is provided for an embodiment of the present application.

[0055] Figure 8 A common-mode voltage simulation schematic diagram of a three-phase four-bridge-arm in a range of -30 degrees to 90 degrees is provided for an embodiment of the present application.

[0056] Figure 9 A three-phase four-bridge-arm carrier phase-shifting schematic diagram in a range of 90 degrees to 210 degrees is provided for an embodiment of the present application.

[0057] Figure 10 A three-phase four-bridge-arm carrier phase-shifting schematic diagram in a range of 210 degrees to 330 degrees is provided for an embodiment of the present application.

[0058] Figure 11 A structure schematic diagram of a control device of an inverter circuit is provided for an embodiment of the present application.

[0059] Figure 12 A structure schematic diagram of a power electronic module is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application.

[0061] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0062] In the description of the present application, it should be noted that if the positions or location relationships indicated by the terms “upper”, “lower”, etc. are based on the positions or location relationships shown in the drawings, or the positions or location relationships of the products of the present application when they are usually placed, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0063] Furthermore, the terms "first", "second", and the like, in the description and in the claims of the present application, as well as above-mentioned drawings, are intended to distinguish similar objects and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the data thus designated can be interchanged, where appropriate, so that the embodiments of the application described herein can be carried out in other than the order shown or described herein. Moreover, the terms "comprising" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a list of steps or units not necessarily limited to those expressly identified, but can include other not expressly identified but inherent steps or units to such process, method, product, or apparatus.

[0064] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0065] In a three-phase system, an unbalanced load can cause the output of the inverter circuit to be unbalanced. The three-phase four-leg topology can provide a zero sequence or negative sequence path for unbalanced current, has strong unbalanced load carrying capacity, and is widely used in uninterruptible power supplies (UPS), energy storage bidirectional AC / DC converters (PCS), and active power filters (APF).

[0066] In the three-phase four-leg circuit, the N line is connected to the midpoint of the fourth bridge arm. Therefore, for both grid-connected and off-grid, the chopping of any bridge arm will cause the high-frequency zero-sequence common-mode voltage of the bus capacitor midpoint to the grid-side N point (remote connected to PE). The common-mode voltage not only affects the service life of the AC load, but also generates electromagnetic interference. Therefore, it is extremely important to study the pulse width modulation method for reducing the common-mode voltage.

[0067] In related technologies, the sine modulation wave and the triangular carrier wave are frequently taken to reduce the common-mode voltage, and the implementation process is relatively complex. Embodiments of the present application provide a control method of an inverter circuit, determines a to-be-phase-shifted carrier wave from a multi-phase carrier wave, performs phase shift processing on the to-be-phase-shifted carrier wave to obtain a phase-shifted carrier wave, and generates a control signal according to the phase-shifted carrier wave, a non-phase-shifted carrier wave in the multi-phase carrier wave, and a modulation wave corresponding to the multi-phase carrier wave. The generation process of the control signal is more convenient, the control signal can be used to control the working state of the bridge arm of the inverter circuit, the common-mode voltage of the bridge arm of the inverter circuit can be reduced, the implementation process is simple, and the implementation result is effective.

[0068] Figure 1 A topology schematic diagram of a three-phase four-leg two-level converter provided by the embodiments of the present application is shown in FIG. 1, which can include inductors L1, L2, L3, L4, switches Sa, Sb, Sc, Sn, capacitors C1, C2. The connection relationship between each device can be referred to FIG. 1. Figure 1 A topology schematic diagram of a three-phase four-leg two-level converter provided by the embodiments of the present application is shown in FIG. 1, which can include inductors L1, L2, L3, L4, switches Sa, Sb, Sc, Sn, capacitors C1, C2. The connection relationship between each device can be referred to FIG. 1.Figure 1 .

[0069] wherein, Figure 1 A, B, C, N in the formula represent the three-phase four-wire grid output end. The switching function is defined as follows:

[0070]

[0071] The high-frequency common-mode voltage V NN‘ can be calculated according to the following formula:

[0072]

[0073] wherein, S a0 represents the switching state of the a-phase switching function, S b0 represents the switching state of the b-phase switching function, S c0 represents the switching state of the c-phase switching function, S n0 represents the switching state of the n-phase switching function, and Vdc represents the bus voltage.

[0074] In different switching states, the two-level switching function of the four-leg and the common-mode voltage amplitude are shown in Table 1:

[0075] Table 1

[0076]

[0077]

[0078] wherein, V a0 represents the midpoint voltage of the a-phase relative to the zero point of the bus, V b0 represents the midpoint voltage of the b-phase relative to the zero point of the bus, V c0 represents the midpoint voltage of the c-phase relative to the zero point of the bus, and V n0 represents the midpoint voltage of the n-phase relative to the zero point of the bus.

[0079] As can be seen from the table, the common-mode voltage amplitude has five components, which are -Vdc / 2, -Vdc / 4, 0, Vdc / 4, and Vdc / 2. Among them, the common-mode voltage amplitude of the zero vector (0, 0, 0, 0) and (1, 1, 1, 1) is the largest, which is Vdc / 2; when the sum of the four-leg switching functions is odd, the common-mode voltage amplitude is Vdc / 4; when the sum of the switching functions is even (non-zero vector), the common-mode voltage amplitude can theoretically reach 0V.

[0080] If a three-phase alternating current load is connected, the fourth bridge only has a common mode suppression effect, and the fourth filter flows a high-frequency current with a small amplitude. The fourth bridge arm can adopt an exclusive or processing of the first three PWM (Pulse Width Modulation) waveforms to ensure a zero common mode vector state (the sum of the switching functions is even), that is, the zero common mode scheme can be realized. However, at this time, the fourth bridge switching frequency is three times the normal switching frequency, and it cannot carry a zero sequence or unbalanced load.

[0081] The control method of the inverter circuit provided in the embodiments of the present application can reduce the common mode voltage to 1 / 8. The control method of the inverter circuit provided in the embodiments of the present application is explained and described below.

[0082] Figure 2 The flowchart of the control method of the inverter circuit provided in the embodiments of the present application Figure 1 As shown in the flowchart, the method can include the following steps. Figure 2

[0083] S101, acquiring a target angle range of any phase sinusoidal voltage in a multi-phase sinusoidal voltage.

[0084] In the multi-phase sinusoidal voltage, each phase sinusoidal voltage has a phase difference of a first preset angle. Only the target angle range of any phase sinusoidal voltage needs to be acquired.

[0085] Optionally, any phase sinusoidal voltage in the multi-phase sinusoidal voltage can be any phase sinusoidal voltage in A-phase, B-phase, C-phase, and N-phase sinusoidal voltage.

[0086] In some embodiments, a phase-locked loop can be used to accurately phase-lock any phase sinusoidal voltage in the multi-phase sinusoidal voltage to obtain a phase-locked angle, that is, the target angle range.

[0087] S102, determining a to-be-phase-shifted carrier from the multi-phase carrier according to the target angle range and a preset relationship.

[0088] The preset relationship is used to represent the corresponding relationship between the preset angle range and the preset to-be-phase-shifted carrier.

[0089] In addition, the preset relationship can be stored on the power electronic module, and the number of preset angle ranges can be multiple. The preset to-be-phase-shifted carrier corresponding to different preset angle ranges can be different.

[0090] In some embodiments, the target angle range can be used to search for a matching preset angle range from the multiple preset angle ranges of the preset relationship. The preset to-be-phase-shifted carrier corresponding to the matching preset angle range in the preset relationship can be used as the to-be-phase-shifted carrier.

[0091] ​It should be noted that the carrier to be phase-shifted is a portion of the multiphase carriers, and the number of carriers to be phase-shifted can be at least one.

[0092] S103. Perform phase shifting processing on the carrier to be phase shifted to obtain the phase-shifted carrier.

[0093] Among them, the phase-shifted carrier can be processed by a second preset angle to obtain the phase-shifted carrier.

[0094] In the embodiments of this application, if there are multiple carriers to be phase-shifted, the multiple carriers to be phase-shifted can be phase-shifted sequentially, or the multiple carriers to be phase-shifted can be phase-shifted simultaneously, or other methods can be used to phase-shift the multiple carriers to be phase-shifted. The embodiments of this application do not impose specific limitations on this.

[0095] S104. Based on the phase-shifted carrier, the unphased carrier in the multiphase carrier, and the modulation wave corresponding to the multiphase carrier, a control signal is generated to control the working state of the inverter circuit bridge arm.

[0096] It is worth noting that the unphased carriers in a polyphase carrier are the remaining carriers in the polyphase carrier except for the carrier to be phase-shifted.

[0097] In some implementations, a control signal can be generated by comparing the phase-shifted carrier, the unphased carrier in the polyphase carrier, and the modulation wave corresponding to the polyphase carrier. The modulation wave corresponding to the polyphase carrier can be either the phase-shifted carrier or the modulation wave corresponding to the unphased carrier.

[0098] In this embodiment, the control signal can be used to control the operating state of the inverter circuit bridge arm. By inputting the control signal into the inverter circuit bridge arm, the operating state of the inverter circuit bridge arm can change. Moreover, by controlling the inverter circuit bridge arm based on the control signal, the common-mode voltage can be suppressed.

[0099] To sum up, the embodiment of the application provides a control method of an inverter circuit, which comprises the following steps: obtaining a target angle range of any phase sinusoidal voltage in multi-phase sinusoidal voltage; determining a to-be-phase-shifted carrier from the multi-phase carrier according to the target angle range and a preset relationship, wherein the preset relationship is used to represent the corresponding relationship between the preset angle range and the preset to-be-phase-shifted carrier; performing phase shift processing on the to-be-phase-shifted carrier to obtain a phase-shifted carrier; and generating a control signal according to the phase-shifted carrier, a non-phase-shifted carrier in the multi-phase carrier and a modulation wave corresponding to the multi-phase carrier, so as to control the working state of the bridge arm of the inverter circuit. The to-be-phase-shifted carrier is determined from the multi-phase carrier, the phase shift processing is performed on the to-be-phase-shifted carrier to obtain the phase-shifted carrier, and the control signal can be generated according to the phase-shifted carrier, the non-phase-shifted carrier in the multi-phase carrier and the modulation wave corresponding to the multi-phase carrier, so that the generation process of the control signal is more convenient, the control signal can be used to control the working state of the bridge arm of the inverter circuit, the common-mode voltage of the bridge arm of the inverter circuit can be reduced, and the process is simple and the implementation result is effective.

[0100] Figure 3 The flowchart of the control method of the inverter circuit provided by the embodiment of the application Figure 2 As shown in Figure 3 The process of determining the to-be-phase-shifted carrier from the multi-phase carrier according to the target angle range and the preset relationship in S102 can comprise the following steps:

[0101] S201, determining a reference carrier from the multi-phase carrier.

[0102] The reference carrier can be any carrier in the multi-phase carrier. The reference carrier can be determined from the multi-phase carrier according to actual requirements, and the embodiment of the application does not make specific limitation in this regard.

[0103] S202, determining the to-be-phase-shifted carrier from the multi-phase carrier according to the target angle range, the reference carrier and the preset relationship.

[0104] In the embodiment of the application, the preset relationship can also represent the corresponding relationship among the preset reference carrier, the preset angle range and the preset to-be-phase-shifted carrier. The preset to-be-phase-shifted carrier corresponding to the same preset angle range can be different for different reference carriers.

[0105] In some embodiments, the power electronic module can find a preset reference carrier matched with the reference carrier from the plurality of preset reference carriers in the preset relationship, find a preset angle range matched with the target angle range from the plurality of preset angle ranges corresponding to the matched preset reference carrier, and take the preset to-be-phase-shifted carrier corresponding to the matched preset angle range as the to-be-phase-shifted carrier.

[0106] Optionally, the target angle range is any one of the following: -30 degrees to 90 degrees, 90 degrees to 210 degrees, 310 degrees to 330 degrees; the multi-phase carrier includes: a first phase carrier, a second phase carrier, a third phase carrier, and a fourth phase carrier.

[0107] The first phase carrier, the second phase carrier, the third phase carrier, and the fourth phase carrier are carriers of different phases.

[0108] In some embodiments, the multi-phase carrier is a carrier of different phases, and can include an a-phase carrier, a b-phase carrier, a c-phase carrier, and an n-phase carrier. The first phase carrier can be any one of the a-phase carrier, the b-phase carrier, the c-phase carrier, and the n-phase carrier; the second phase carrier can also be any one of the a-phase carrier, the b-phase carrier, the c-phase carrier, and the n-phase carrier; the third phase carrier can also be any one of the a-phase carrier, the b-phase carrier, the c-phase carrier, and the n-phase carrier; and the fourth phase carrier can also be any one of the a-phase carrier, the b-phase carrier, the c-phase carrier, and the n-phase carrier.

[0109] Optionally, the reference carrier is the first phase carrier, and the to-be-phase-shifted carrier is determined from the multi-phase carrier according to the target angle range, the reference carrier, and a preset relationship, including:

[0110] If the target angle range is -30 degrees to 90 degrees, the second phase carrier and the fourth phase carrier are determined as the to-be-phase-shifted carrier according to the preset relationship, and the first phase carrier and the third phase carrier are the non-phase-shifted carrier.

[0111] In some embodiments, the reference carrier can be the a-phase carrier, and if the target angle range is -30 degrees to 90 degrees, the b-phase carrier and the n-phase carrier are determined as the two-phase to-be-phase-shifted carrier according to the preset relationship, and the a-phase carrier and the c-phase carrier are the non-phase-shifted carrier.

[0112] In some embodiments, the reference carrier can be the b-phase carrier, and if the target angle range is -30 degrees to 90 degrees, the a-phase carrier and the c-phase carrier are determined as the two-phase to-be-phase-shifted carrier according to the preset relationship, and the b-phase carrier and the n-phase carrier are the non-phase-shifted carrier.

[0113] If the target angle range is 90 degrees to 210 degrees, the third phase carrier and the fourth phase carrier are determined as the to-be-phase-shifted carrier according to the preset relationship, and the first phase carrier and the second phase carrier are the non-phase-shifted carrier.

[0114] In some embodiments, the reference carrier can be the a-phase carrier, and if the target angle range is 90 degrees to 210 degrees, the c-phase carrier and the n-phase carrier are determined as the two-phase to-be-phase-shifted carrier according to the preset relationship, and the a-phase carrier and the b-phase carrier are the non-phase-shifted carrier.

[0115] In some embodiments, the reference carrier wave can be the b-phase carrier wave, and if the target angle range is 90-210 degrees, the c-phase carrier wave and the n-phase carrier wave are two-phase carrier waves to be phase-shifted according to a preset relationship, and the a-phase carrier wave and the b-phase carrier wave are un-shifted carrier waves.

[0116] If the target angle range is 310-330 degrees, the second-phase carrier wave and the third-phase carrier wave are carrier waves to be phase-shifted, and the first-phase carrier wave and the fourth-phase carrier wave are un-shifted carrier waves according to a preset relationship.

[0117] In some embodiments, the reference carrier wave can be the a-phase carrier wave, and if the target angle range is 310-330 degrees, the b-phase carrier wave and the c-phase carrier wave are two-phase carrier waves to be phase-shifted according to a preset relationship, and the a-phase carrier wave and the n-phase carrier wave are un-shifted carrier waves.

[0118] In some embodiments, the reference carrier wave can be the b-phase carrier wave, and if the target angle range is 310-330 degrees, the a-phase carrier wave and the n-phase carrier wave are two-phase carrier waves to be phase-shifted according to a preset relationship, and the b-phase carrier wave and the b-phase carrier wave are un-shifted carrier waves.

[0119] It is worth noting that the power electronic module can sequentially determine whether each phase carrier wave in the multi-phase carrier wave is a carrier wave to be phase-shifted, and if so, the phase-shifted carrier wave is obtained by phase-shift processing.

[0120] In the embodiments of the present application, if the reference carrier wave is the a-phase carrier wave, the a-phase carrier wave is set to be counted up and down, and a synchronization signal is generated at the zero-crossing to trigger the b / c / n-phase carrier wave to load the value of the corresponding phase-shift register. Figure 4 A control method of an inverter circuit is provided in the embodiments of the present application Figure 3 As shown in Figure 4 The phase-locked loop is used to accurately lock any phase sinusoidal voltage in the multi-phase sinusoidal voltage, and it can be determined whether the phase-locked angle (target angle range) is within the range of -30-90 degrees. If it is within the range of -30-90 degrees, the c-phase carrier wave phase-shift value is 0, the b-phase and c-phase carrier wave phase-shift values are the second preset angle, and the counting is synchronized. If the phase-locked angle is not within the range of -30-90 degrees, it is determined whether the phase-locked angle is within the range of 90-210 degrees. If it is within the range of 90-210 degrees, the b-phase carrier wave phase-shift value is 0, the c-phase and n-phase carrier wave phase-shift values are the second preset angle, and the counting is synchronized. If the phase-locked angle is not within the range of 90-210 degrees, the n-phase carrier wave phase-shift value is 0, the b-phase and c-phase carrier wave phase-shift values are the second preset angle, and the counting is synchronized.

[0121] Optionally, the multi-phase carrier wave includes a first phase carrier wave, a second phase carrier wave, a third phase carrier wave, and a fourth phase carrier wave, and the modulation wave corresponding to the multi-phase carrier wave includes a first phase modulation wave, a second phase modulation wave, a third phase modulation wave, and a fourth phase modulation wave.

[0122] In some embodiments, the multi-phase carrier wave includes an a-phase carrier wave, a b-phase carrier wave, a c-phase carrier wave, and an n-phase carrier wave, and the modulation wave corresponding to the multi-phase carrier wave includes an a-phase modulation wave, a b-phase modulation wave, a c-phase modulation wave, and an n-phase modulation wave.

[0123] Optionally, before the process of generating the control signal according to the phase-shifted carrier wave, the un-phase-shifted carrier wave in the multi-phase carrier wave, and the modulation wave corresponding to the multi-phase carrier wave in S104, the method can further include:

[0124] The fourth phase modulation wave is determined according to the first phase modulation wave, the second phase modulation wave, and the third phase modulation wave.

[0125] The fourth phase modulation wave can be determined according to the a-phase modulation wave, the b-phase modulation wave, and the c-phase modulation wave.

[0126] In addition, after the SVPWM (Space Vector Pulse Width Modulation) modulation of the phase-difference-120-degree three-phase sinusoidal wave, the first phase modulation wave, the second phase modulation wave, and the third phase modulation wave can be obtained, and the first phase modulation wave, the second phase modulation wave, and the third phase modulation wave can all be horse saddle waves.

[0127] In the embodiments of the present application, the three-phase sinusoidal alternating current system adopts a bipolar modulation mode, and the three-phase sinusoidal wave has an equal amplitude and a phase difference of 120 degrees.

[0128] V a =Msin(ωt)

[0129]

[0130]

[0131] V a , V b , and V c represent the three-phase sinusoidal wave with a phase difference of 120 degrees, ωt represents an angle, and M is a preset amplitude.

[0132] After the SVPWM modulation, a zero sequence component V0 is equivalently superimposed:

[0133]

[0134] Therefore, the three-phase modulation wave under the SVPWM modulation is V av (a-phase modulation wave), Vbv (b-phase modulation wave), V cv (c-phase modulation wave):

[0135] V av = V a + V0

[0136] V bv = V b + V0

[0137] V cv = V c + V0

[0138] The process of determining the fourth-phase modulation wave according to the first-phase modulation wave, the second-phase modulation wave and the third-phase modulation wave can include: taking the average value of the first-phase modulation wave, the second-phase modulation wave and the third-phase modulation wave as the fourth-phase modulation wave.

[0139] In the embodiment of the application, the average value of the a-phase modulation wave, the b-phase modulation wave and the c-phase modulation wave can be taken as the n-phase modulation wave, and the calculation amount is small.

[0140] For example, taking the modulation in the range of -30° to 90°, at this time, the zero sequence component is:

[0141]

[0142] The three-phase SVPWM modulation wave can be described as:

[0143]

[0144]

[0145]

[0146] It can be seen that the average value of the sum of the three-phase modulation waves is the a-phase modulation wave, which is taken as the n-phase modulation wave:

[0147]

[0148] Optionally, the process of performing phase shift processing on the to-be-phase-shifted carrier wave to obtain the phase-shifted carrier wave in the S103 can include:

[0149] The to-be-phase-shifted carrier wave is processed by phase shifting 180 degrees to obtain the phase-shifted carrier wave.

[0150] Figure 5 A two-level four-bridge-arm voltage vector distribution diagram in the range of -30 degrees to 90 degrees provided by the embodiment of the application is as shown in FIG. 3. Figure 5As shown in (a) and (b) in the figure, SVPWM-A represents a phase modulation wave, SVPWM-B represents b phase modulation wave, SVPWM-C represents b phase modulation wave, and SVPWM-N represents n phase modulation wave. It can be seen that there are five kinds of vector components (V0, V2, V3, V10, V15) in the switching period, and the maximum common mode voltage amplitude of the system is Vdc / 2 due to the existence of zero vector V0 (0, 0, 0, 0) and V15 (1, 1, 1, 1).

[0151] Figure 6 A three-phase four-bridge arm carrier phase shift schematic diagram in the range of -30 degrees to 90 degrees provided for the embodiment of the application is shown in the figure. Figure 6 As shown in the figure, the c phase carrier signal is in the same phase as the a phase carrier signal in the range of -30 degrees to 90 degrees, and the b phase and n phase triangular carrier waves are phase shifted by 180 degrees.

[0152] Figure 7 A three-phase four-bridge arm low common mode voltage vector distribution diagram in the range of -30 degrees to 90 degrees provided for the embodiment of the application is shown in the figure. Figure 7 As shown in the figure, SVPWM-A represents a phase modulation wave, SVPWM-B represents b phase modulation wave, SVPWM-C represents b phase modulation wave, and SVPWM-N represents n phase modulation wave. It can be seen that the vector components in the switching period are reduced to four (V2, V6, V10, V11) after the b phase and n phase carrier waves are phase shifted by 180 degrees, and the zero vectors V0 and V15 before the phase shift are replaced by non-zero vectors. In the range of -30 degrees to 90 degrees, the peak-to-peak value of the common mode voltage can be reduced to Vdc / 4, and when the 300 Hz (hertz) low frequency fluctuation is ignored, the common mode voltage amplitude in the range of -30 degrees to 90 degrees can be reduced to Vdc / 8.

[0153] Figure 8 A common mode voltage simulation schematic diagram of a three-phase four-bridge arm in the range of -30 degrees to 90 degrees provided for the embodiment of the application is shown in the figure. Figure 8 As shown in the figure, the common mode voltage is better suppressed.

[0154] Figure 9 A three-phase four-bridge arm carrier phase shift schematic diagram in the range of 90 degrees to 210 degrees provided for the embodiment of the application is shown in the figure. Figure 9 As shown in the figure, the b phase carrier wave is kept in the same phase as the a phase carrier wave in the range of 90 degrees to 210 degrees, and the c phase and n phase carrier waves are phase shifted by 180 degrees.

[0155] Figure 10 A three-phase four-bridge arm carrier phase shift schematic diagram in the range of 210 degrees to 330 degrees provided for the embodiment of the application is shown in the figure. Figure 10 As shown in the figure, the n phase carrier wave is kept in the same phase as the a phase carrier wave in the range of 210 degrees to 330 degrees, and the b phase and c phase carrier waves are phase shifted by 180 degrees.

[0156] It should be noted that the four-leg voltage vector distribution in the range of 90 degrees to 210 degrees and the range of 210 degrees to 330 degrees, and the common-mode voltage analysis process is similar to the analysis in the range of -30 degrees to 90 degrees, and finally the effect of Vdc / 8 common-mode voltage amplitude can also be achieved, which is not described here.

[0157] To sum up, the embodiment of the application provides a control method of an inverter circuit, determines a to-be-phase-shifted carrier from a multi-phase carrier, performs phase shift processing on the to-be-phase-shifted carrier to obtain a phase-shifted carrier, and generates a control signal according to the phase-shifted carrier, a non-phase-shifted carrier in the multi-phase carrier, and a modulation wave corresponding to the multi-phase carrier, so that the generation process of the control signal is more convenient, the control signal can be used to control the working state of the bridge arm of the inverter circuit, the common-mode voltage of the bridge arm of the inverter circuit can be reduced, the implementation process is simple, and the implementation result is effective.

[0158] Moreover, the non-zero vector synthesis is adopted, the common-mode voltage amplitude is reduced from 1 / 2 to 1 / 8. The phase-locked loop output angle is judged, and the carrier phase shift is realized by means of the phase shift register of the chip, the operation is simple, the code implementation is easy, and the method is suitable for low common-mode digital application occasions.

[0159] The following describes a device, a power electronic module, and a storage medium for performing the control method of the inverter circuit provided in the application, and specific implementation processes and technical effects are referred to the related content of the above method, which will not be described here.

[0160] Figure 11 A structural schematic diagram of a control device of an inverter circuit provided in the embodiment of the application is shown in the figure, and the device can include: Figure 11

[0161] The acquisition module 1101 is configured to acquire a target angle range of any phase sinusoidal voltage in a multi-phase sinusoidal voltage.

[0162] The determination module 1102 is configured to determine a to-be-phase-shifted carrier from a multi-phase carrier according to the target angle range and a preset relationship, and the preset relationship is used to represent the corresponding relationship between a preset angle range and a preset to-be-phase-shifted carrier.

[0163] The processing module 1103 is configured to perform phase shift processing on the to-be-phase-shifted carrier to obtain a phase-shifted carrier.

[0164] The generation module 1104 is configured to generate a control signal according to the phase-shifted carrier, a non-phase-shifted carrier in the multi-phase carrier, and a modulation wave corresponding to the multi-phase carrier, and the control signal is used to control the working state of the bridge arm of the inverter circuit.

[0165] ​Optionally, the determining module 1102 is specifically configured to determine a reference carrier from the multi-phase carriers; and determine the to-be-phase-shifted carrier from the multi-phase carriers according to the target angle range, the reference carrier and the preset relationship.

[0166] Optionally, the target angle range is any one of the following: -30 degrees to 90 degrees, 90 degrees to 210 degrees, 310 degrees to 330 degrees.

[0167] The multi-phase carriers include a first phase carrier, a second phase carrier, a third phase carrier and a fourth phase carrier.

[0168] Optionally, the reference carrier is the first phase carrier, and the determining module 1002 is specifically configured to, if the target angle range is -30 degrees to 90 degrees, determine the second phase carrier and the fourth phase carrier as the to-be-phase-shifted carriers according to the preset relationship, and determine the first phase carrier and the third phase carrier as the non-phase-shifted carriers.

[0169] If the target angle range is 90 degrees to 210 degrees, the third phase carrier and the fourth phase carrier are determined as the to-be-phase-shifted carriers according to the preset relationship, and the first phase carrier and the second phase carrier are determined as the non-phase-shifted carriers.

[0170] If the target angle range is 310 degrees to 330 degrees, the second phase carrier and the third phase carrier are determined as the to-be-phase-shifted carriers according to the preset relationship, and the first phase carrier and the fourth phase carrier are determined as the non-phase-shifted carriers.

[0171] Optionally, the multi-phase carriers include a first phase carrier, a second phase carrier, a third phase carrier and a fourth phase carrier, and modulation waves corresponding to the multi-phase carriers include a first phase modulation wave, a second phase modulation wave, a third phase modulation wave and a fourth phase modulation wave.

[0172] The apparatus further includes:

[0173] A first determining module is configured to determine the fourth phase modulation wave according to the first phase modulation wave, the second phase modulation wave and the third phase modulation wave.

[0174] Optionally, the first determining module is specifically configured to take an average value of the first phase modulation wave, the second phase modulation wave and the third phase modulation wave as the fourth phase modulation wave.

[0175] Optionally, the processing module is specifically configured to perform a 180-degree phase shift on the to-be-phase-shifted carrier to obtain the phase-shifted carrier.

[0176] The apparatus described above is used to execute the method provided in the foregoing embodiments, and has similar implementation principles and technical effects, which will not be described here.

[0177] The above modules can be one or more integrated circuits configured to implement the above methods, for example, one or more Application Specific Integrated Circuits (ASICs), or one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when a certain module above is implemented in the form of a processing element scheduling code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor that can invoke code. For another example, the modules can be integrated together to implement in the form of a system-on-a-chip (SOC).

[0178] Figure 12 A structural diagram of a power electronic module provided by an embodiment of the present application is shown in FIG. 1, which includes a processor 1201 and a memory 1202. Figure 12

[0179] The memory 1202 is configured to store a program, and the processor 1201 invokes the program stored in the memory 1202 to execute the above method embodiments. The specific implementation and technical effects are similar, and will not be repeated here.

[0180] Optionally, the present application also provides a program product, for example, a computer readable storage medium, including a program, which is used to execute the above method embodiments when executed by a processor.

[0181] In several embodiments provided by the present application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are only schematic, and the division of the units is only a logical function division. There can be another division manner 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 displayed or discussed mutual coupling or direct coupling or communication connection can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0182] ​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, that is, 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.

[0183] In addition, each functional unit in each embodiment of the 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 hardware plus software functional unit.

[0184] The integrated unit realized in the form of software functional unit can be stored in a computer readable storage medium. The software functional unit stored in a storage medium includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to execute part of the steps of the method described in each embodiment of the application. The foregoing storage medium includes a variety of program code storage media such as a U disk, a mobile hard disk, a read-only memory (English: Read-Only Memory, abbreviated as: ROM), a random access memory (English: Random Access Memory, abbreviated as: RAM), a magnetic disk or an optical disk.

[0185] The above is only the preferred embodiment of the application and is not intended to limit the application. For those skilled in the art, the application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A control method of an inverter circuit, characterized by, The method comprises: acquiring a target angle range of any one of the phases of a multi-phase sinusoidal voltage; determining a to-be-phase-shifted carrier from the multi-phase carriers according to the target angle range and a preset relationship, the preset relationship being used to represent a corresponding relationship between a preset angle range and a preset to-be-phase-shifted carrier; performing phase shift processing on the to-be-phase-shifted carrier to obtain a phase-shifted carrier; generating a control signal according to the phase-shifted carrier, a non-phase-shifted carrier in the multi-phase carriers, and a modulation wave corresponding to the multi-phase carriers, the control signal being used to control the working state of a bridge arm of an inverter circuit.

2. The method of claim 1, wherein, The method comprises: determining a reference carrier from the multi-phase carriers; determining the to-be-phase-shifted carrier from the multi-phase carriers according to the target angle range, the reference carrier, and the preset relationship.

3. The method of claim 2, wherein, The target angle range is any one of -30 degrees to 90 degrees, 90 degrees to 210 degrees, and 310 degrees to 330 degrees. The multi-phase carriers comprise a first-phase carrier, a second-phase carrier, a third-phase carrier, and a fourth-phase carrier.

4. The method of claim 3, wherein, The reference carrier is the first-phase carrier, and the method comprises: if the target angle range is -30 degrees to 90 degrees, determining the second-phase carrier and the fourth-phase carrier as the to-be-phase-shifted carriers according to the preset relationship, and determining the first-phase carrier and the third-phase carrier as the non-phase-shifted carriers; if the target angle range is 90 degrees to 210 degrees, determining the third-phase carrier and the fourth-phase carrier as the to-be-phase-shifted carriers according to the preset relationship, and determining the first-phase carrier and the second-phase carrier as the non-phase-shifted carriers; if the target angle range is 310 degrees to 330 degrees, determining the second-phase carrier and the third-phase carrier as the to-be-phase-shifted carriers according to the preset relationship, and determining the first-phase carrier and the fourth-phase carrier as the non-phase-shifted carriers.

5. The method of claim 1, wherein, The multi-phase carriers comprise a first-phase carrier, a second-phase carrier, a third-phase carrier, and a fourth-phase carrier, and the modulation wave corresponding to the multi-phase carriers comprises a first-phase modulation wave, a second-phase modulation wave, a third-phase modulation wave, and a fourth-phase modulation wave. Before the control signal is generated according to the phase-shifted carrier, the non-phase-shifted carrier in the multi-phase carriers, and the modulation wave corresponding to the multi-phase carriers, the method further comprises: determining the fourth-phase modulation wave according to the first-phase modulation wave, the second-phase modulation wave, and the third-phase modulation wave.

6. The method of claim 5, wherein, The method comprises: taking the average value of the first-phase modulation wave, the second-phase modulation wave, and the third-phase modulation wave as the fourth-phase modulation wave.

7. The method according to any of claims 1 to 6, characterized in that The method comprises: performing 180-degree phase shift processing on the to-be-phase-shifted carrier to obtain the phase-shifted carrier.

8. A control device for an inverter circuit, characterized by comprising: The method comprises: An acquisition module is configured to acquire a target angle range of any phase sinusoidal voltage in a multi-phase sinusoidal voltage; A determination module is configured to determine a to-be-phase-shifted carrier from the multi-phase carrier according to the target angle range and a preset relationship, the preset relationship being used to represent a corresponding relationship between a preset angle range and a preset to-be-phase-shifted carrier; A processing module is configured to perform phase shift processing on the to-be-phase-shifted carrier to obtain a phase-shifted carrier; A generation module is configured to generate a control signal according to the phase-shifted carrier, a non-phase-shifted carrier in the multi-phase carrier, and a modulation wave corresponding to the multi-phase carrier, the control signal being used to control a working state of a bridge arm of an inverter circuit.

9. A power electronic module, characterized by The inverter circuit comprises: A memory and a processor, the memory storing a computer program executable by the processor, and the processor implementing the control method of the inverter circuit according to any one of claims 1-7 when executing the computer program.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is read and executed to implement the control method of the inverter circuit according to any one of claims 1-7.

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