Bipolar vector control method, simplified matrix converter and storage medium

Abstract

The invention provides a bipolar vector control method, a simplified matrix converter and a storage medium, and the method is applied to the simplified matrix converter, and comprises the steps: obtaining the three-phase voltage of a three-phase power grid in a current signal mode; determining a vector action sequence corresponding to the simplified matrix converter in the current signal mode according to the three-phase voltage and pre-stored sector mapping information of the voltage and a switching tube; according to the vector action sequence and pre-stored target power information of the simplified matrix converter, determining vector action information corresponding to each switching tube of the simplified matrix converter in each control period; and according to the vector action sequence and the vector action information, controlling on-off of each switching tube in the simplified matrix converter. The switching-on loss of the switching tubes in the simplified matrix converter can be reduced, and the overall efficiency of the simplified matrix converter can be improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a bipolar vector control method, a simplified matrix converter and a storage medium. Background Art

[0002] Reduced Matrix Converter (RMC) is a new type of power converter derived from the traditional matrix converter (MC) topology. It is widely used in new energy industries such as the electric vehicle industry, communication power supply industry, and energy storage system. The reduced matrix conversion module is mainly used to control two bipolar vectors, sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM), to achieve AC power parameter (such as phase number, phase, amplitude, frequency) conversion.

[0003] In order to improve the overall efficiency of the simplified matrix converter, the simplified matrix converter in the prior art usually uses silicon carbide MOS as a switch tube, and synthesizes a target current vector through three effective vectors and one zero vector to achieve bipolar vector control.

[0004] However, this simplified matrix converter and bipolar vector control method have the problem of excessive turn-on loss during the control process, which leads to low overall efficiency of the simplified matrix converter. Summary of the invention

[0005] The purpose of the present application is to provide a bipolar vector control method, a simplified matrix converter and a storage medium to address the shortcomings of the above-mentioned prior art, so as to solve the problem of low overall efficiency of the simplified matrix converter in the prior art.

[0006] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0007] In a first aspect, an embodiment of the present application provides a bipolar vector control method, which is applied to a simplified matrix converter, wherein the simplified matrix converter includes a plurality of switch tubes, each of which is a metal-oxide semiconductor field effect transistor, and the method includes:

[0008] In the current signal mode, the three-phase voltage of the three-phase power grid is obtained;

[0009] Determine a vector action sequence corresponding to the reduced matrix converter in the current signal mode according to the three-phase voltage and pre-stored voltage and switch tube sector mapping information, wherein the sector mapping information is used to indicate the expected on-off state of each switch tube in the reduced matrix converter under different three-phase voltages, and the vector action sequence is used to indicate two groups of switch tubes that need to be turned on in each control period that is successively adjacent to each other in a vector control cycle;

[0010] Determine, according to the vector action sequence and the pre-stored target power information of the simplified matrix converter, the vector action information corresponding to each switch tube of the simplified matrix converter in each control period, wherein the vector action information includes the duty cycle and the operating current of each switch tube;

[0011] According to the vector action sequence and the vector action information, the on and off of each switch tube in the simplified matrix converter is controlled.

[0012] In a possible implementation, determining the vector action sequence corresponding to the reduced matrix converter in the current signal mode according to the three-phase voltage and pre-stored voltage and switch tube sector mapping information includes:

[0013] Determine the vector action sector corresponding to the simplified matrix converter according to the three-phase voltage and pre-stored voltage and switch tube sector mapping information;

[0014] According to the vector action sector, a vector action sequence corresponding to the reduced matrix converter is determined.

[0015] In a possible implementation, determining the vector action sector corresponding to the reduced matrix converter according to the three-phase voltage and pre-stored voltage and switch tube sector mapping information includes:

[0016] The vector action sector corresponding to the simplified matrix converter is determined by matching the magnitude relationship of the three-phase voltages and the pre-stored voltage and sector mapping information of the switch tube.

[0017] In a possible implementation manner, determining the vector action sequence corresponding to the reduced matrix converter according to the vector action sector includes:

[0018] Determine a plurality of to-be-selected vector action sequences corresponding to the vector action sector;

[0019] According to each of the candidate vector action sequences, determining the loss information corresponding to each switch tube in the simplified matrix converter under each of the candidate vector action sequences as the loss information corresponding to each of the candidate vector action sequences;

[0020] The vector action sequence corresponding to the simplified matrix converter is determined according to the loss information corresponding to each of the to-be-selected vector action sequences.

[0021] In a possible implementation, determining the vector action information corresponding to each switch tube of the simplified matrix converter in each control period according to the vector action sequence and pre-stored target power information of the simplified matrix converter includes:

[0022] Determining a first control sub-period and a second control sub-period of the reduced matrix converter according to the vector action sequence;

[0023] Acquire a first vector group corresponding to the first control sub-cycle and a second vector group corresponding to the second control sub-cycle, wherein the first vector group includes the first control vectors of each control period in the first control sub-cycle, and the second vector group includes the second control vectors of each control period in the second control sub-cycle;

[0024] According to the first vector group, the second vector group and the target power information, vector action information corresponding to each switch tube of the simplified matrix converter in each control period is determined.

[0025] In a possible implementation, determining, according to the first vector group, the second vector group, and the target power information, vector action information corresponding to each switch tube of the reduced matrix converter in each control period includes:

[0026] According to the target power information of the simplified matrix converter, respectively determining the duty cycle and the operating current corresponding to each first control vector in the first vector group in each control period;

[0027] Determine the duty ratio and the operating current corresponding to each second control vector in the second vector group in each control period according to the duty ratio and the operating current corresponding to each first control vector in the first vector group in each control period;

[0028] The duty cycle and operating current corresponding to each of the first control vectors in each control period and the duty cycle and operating current corresponding to each of the second control vectors in each control period are used as vector action information corresponding to each switch tube of the simplified matrix converter in each control period.

[0029] In a possible implementation, the target power information of the simplified matrix converter includes a target current amplitude, a target current modulation ratio, a target output current, and a target input current phase angle;

[0030] The step of determining the duty cycle and the operating current corresponding to each first control vector in the first vector group in each control period according to the target power information of the simplified matrix converter comprises:

[0031] Determine, according to the target output current in the target power information, a working current corresponding to the first control vector in a corresponding control period;

[0032] The duty cycle of the first control vector is calculated based on the target current modulation ratio, the target input current phase angle, the working current corresponding to the first control vector in the corresponding control period, the target current amplitude and the target output current in the target power information.

[0033] In a possible implementation, the calculating the duty cycle of the first control vector according to the target current modulation ratio, the target input current phase angle, the working current corresponding to the first control vector in the corresponding control period, the target current amplitude, and the target output current in the target power information includes:

[0034] Constructing a first duty cycle equation corresponding to the first control vector in the corresponding control period according to the target current amplitude, the working current corresponding to the first control vector in the corresponding control period, the target input current phase angle, and the action direction of the first control vector;

[0035] According to the target current modulation ratio, the target input current phase angle and the action direction of the first control vector, a second duty cycle equation corresponding to the first control vector in the corresponding control period is constructed;

[0036] The first duty cycle equation and the second duty cycle equation are solved to obtain a duty cycle of the first control vector in a corresponding control period.

[0037] In a second aspect, another embodiment of the present application provides a simplified matrix converter, the simplified matrix converter comprising: a control unit and a plurality of switch tubes, each of which is a MOS tube;

[0038] The control unit performs on-off control on the multiple switch tubes based on the method steps described in any one of the first aspects.

[0039] In a third aspect, another embodiment of the present application provides a storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of any method described in the first aspect are executed.

[0040] The beneficial effect of the present application is that: by arranging multiple MOS tubes as switch tubes in the simplified matrix converter, the simplified matrix converter obtains the three-phase voltage of the three-phase power grid in the current signal mode, and determines the vector action sequence corresponding to the simplified matrix converter in the current signal mode according to the three-phase voltage and the pre-stored voltage and the sector mapping information of the switch tube, so that the vector action information corresponding to each switch tube of the simplified matrix converter in each control period can be determined according to the vector action sequence and the pre-stored target power information of the simplified matrix converter, so that the on and off of each switch tube in the simplified matrix converter can be controlled according to the vector action sequence and the vector action information, so that the stress platform of the switch tube in the simplified matrix converter during the opening process is reduced from the minimum to 0, and at the same time, the stress of the switch tube in the simplified matrix converter during the closing process is increased from 0 to the maximum stress platform, so that the opening loss of the switch tube in the simplified matrix converter can be reduced, and the overall efficiency of the simplified matrix converter is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A schematic diagram of the structure of a simplified matrix converter provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of a structure of a processing unit in a simplified matrix converter provided in an embodiment of the present application;

[0044] Figure 3 A schematic flow chart of a bipolar vector control method provided in an embodiment of the present application;

[0045] Figure 4 A schematic diagram of a flow chart for determining a vector action sequence corresponding to a simplified matrix converter in a bipolar vector control method provided in an embodiment of the present application;

[0046] Figure 5 A schematic diagram of the instantaneous value of the three-phase voltage in the bipolar vector control method provided in an embodiment of the present application;

[0047] Figure 6 A vector diagram of three-phase voltage in the bipolar vector control method provided in an embodiment of the present application;

[0048] Figure 7A schematic diagram of a flow chart for determining a vector action sequence corresponding to a simplified matrix converter in a bipolar vector control method provided in an embodiment of the present application;

[0049] Figure 8 A schematic diagram of a flow chart for determining vector action information corresponding to each switch tube of a simplified matrix converter in each control period in a bipolar vector control method provided in an embodiment of the present application;

[0050] Fig. 9 Another schematic diagram of a flow chart for determining vector action information corresponding to each switch tube of a simplified matrix converter in each control period in the bipolar vector control method provided in an embodiment of the present application;

[0051] Fig.10 A schematic diagram of a flow chart for respectively determining the duty ratio and the operating current corresponding to each first control vector in the first vector group in each control period in the bipolar vector control method provided in an embodiment of the present application;

[0052] Fig.11 A schematic diagram of a flow chart of calculating a duty cycle corresponding to a first vector and a first control vector in a corresponding control period in a bipolar vector control method provided in an embodiment of the present application;

[0053] Fig.12 Another vector diagram of three-phase voltage in the bipolar vector control method provided in an embodiment of the present application;

[0054] Fig.13 A schematic diagram of the square wave voltage of the primary winding of the main transformer in the bipolar vector control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] 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 clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0056] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. 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 application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0057] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0058] In order to improve the overall efficiency of the simplified matrix converter, the simplified matrix converter in the prior art usually uses silicon carbide MOS tubes instead of insulated gate bipolar transistors (IGBTs) as switching tubes, and synthesizes the target current vector through two or three effective vectors and one zero vector to achieve bipolar vector control, thereby reducing the overall loss of the simplified matrix converter and improving the overall efficiency of the simplified matrix converter.

[0059] However, when using silicon carbide MOS tubes as switching tubes in a streamlined matrix converter, there are requirements for the turn-on loss and turn-off loss of the silicon carbide MOS tubes. It is easy for the turn-on loss of the silicon carbide MOS tube to be several times larger than the turn-off loss, which leads to excessive turn-on loss of the streamlined matrix converter.

[0060] In order to reduce the turn-on loss of the silicon carbide MOS tube, the prior art can also use silicon carbide MOS tubes with better specifications, but this makes the simplified matrix converter have a high cost problem.

[0061] In summary, the simplified matrix converter and the bipolar vector control method in the prior art have the problem of excessive turn-on loss during the control process, which leads to low overall efficiency of the simplified matrix converter. At the same time, there is also the problem of high cost.

[0062] Based on the above problems, the embodiments of the present application propose a simplified matrix converter and a bipolar vector control method. By arranging multiple silicon carbide MOS tubes as switch tubes in the simplified matrix converter, the simplified matrix converter obtains the three-phase voltage of the three-phase power grid in the current signal mode, and determines the vector action sequence corresponding to the simplified matrix converter in the current signal mode according to the three-phase voltage and the pre-stored voltage and the sector mapping information of the switch tube, so that the vector action information corresponding to each switch tube of the simplified matrix converter in each control period can be determined according to the vector action sequence and the pre-stored target power information of the simplified matrix converter, so that the on and off of each switch tube in the simplified matrix converter can be controlled according to the vector action sequence and the vector action information, so as to reduce the turn-on loss of the switch tube in the simplified matrix converter and improve the overall efficiency of the simplified matrix converter.

[0063] First, the simplified matrix converter involved in the bipolar vector control method provided in the embodiment of the present application is described.

[0064] The simplified matrix converter is a new type of converter obtained by high-frequency coupling of a three-phase AC / AC matrix converter and an uncontrolled full-bridge rectifier circuit through a high-frequency transformer. Figure 1 A schematic diagram of a simplified matrix converter provided in an embodiment of the present application, referring to Figure 1 As shown, the simplified matrix converter is connected to the three-phase power grid and the load to convert the electric energy input from the three-phase power grid and output it to the load. The load may be a DC load.

[0065] Optionally, continue to refer to Figure 1 As shown, the simplified matrix converter includes: a sampling unit, a control unit and a processing unit, wherein the sampling unit is used to sample each device in the processing unit and send the collected sampling data to the control unit, so that the control unit can execute the bipolar vector control method provided in the embodiment of the present application, control the operation of the processing unit, thereby realizing the control of two bipolar vectors, sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM), to achieve AC / DC energy conversion.

[0066] For example, Figure 2 A schematic diagram of a structure of a processing unit in a simplified matrix converter provided in an embodiment of the present application, referring to Figure 2As shown, the input end of the processing unit of the simplified matrix converter is connected to the three-phase power grid, the output end of the processing unit of the simplified matrix converter is connected to the load, and the processing unit of the simplified matrix converter includes filter inductors L1-L4, filter capacitors C1-C4, diodes D1-D4, transformer T1 and multiple switch tubes Q1-Q12. Among them, diodes D1-D4 are uncontrolled rectifier diodes, and transformer T1 includes a primary winding N1 and a secondary winding N2.

[0067] Among them, multiple switching tubes Q1-Q12 are all silicon carbide MOS, and the multiple switching tubes Q1-Q12 include multiple groups of switching tubes, specifically including two A-phase upper tubes Q1-Q2 corresponding to A of the three-phase power grid, two A-phase lower tubes Q3-Q4 corresponding to A of the three-phase power grid, two B-phase upper tubes Q5-Q6 corresponding to B of the three-phase power grid, two B-phase lower tubes Q7-Q8 corresponding to B of the three-phase power grid, two C-phase upper tubes Q9-Q10 corresponding to C of the three-phase power grid, and two C-phase lower tubes Q11-Q12 corresponding to C of the three-phase power grid.

[0068] By way of example, the working principle of the processing unit of the simplified matrix converter is described. Figure 2 As shown, the three-phase voltages Va, Vb and Vc are output to multiple switch tubes Q1-Q12 via filter inductors L1-L3 and filter capacitors C1-C3. Under the control of the control unit of the simplified matrix converter, the multiple switch tubes Q1-Q12 process the three-phase voltages Va, Vb and Vc into rectangular waves with positive and negative origin symmetry, and apply them to the primary winding N1 of the main transformer T1. The rectangular wave voltage with positive and negative origin symmetry of the primary winding N1 is transformed to the secondary winding N2 of the main transformer T1 through the main transformer T1. The amplitude of the rectangular wave voltage with positive and negative origin symmetry on the secondary winding N2 has a transformation ratio relationship with the primary winding. The rectangular wave voltage with positive and negative origin symmetry on the secondary winding N2 outputs a Vout DC voltage through diodes D1-D4 and the filter inductor L4 to enable the DC load to work.

[0069] The bipolar vector control method provided in the embodiments of the present application is described in detail below in combination with multiple embodiments.

[0070] Figure 3 A schematic flow chart of a bipolar vector control method provided in an embodiment of the present application, referring to Figure 3 As shown, the execution subject of the method may be a control unit in the above-mentioned simplified matrix converter, and the method includes:

[0071] S301. In the current signal mode, obtain the three-phase voltage of the three-phase power grid.

[0072] It should be understood that the simplified matrix converter and bipolar vector control method provided in the embodiments of the present application can control both SPWM and SVPWM bipolar vectors. At a moment, there is only one bipolar vector in the simplified matrix converter. Therefore, before controlling the bipolar vector, the simplified matrix converter needs to first determine the current signal mode, that is, to determine whether to control the bipolar vector of the SPWM type or the SVPWM type.

[0073] Optionally, the simplified matrix converter obtains three-phase voltages Va, Vb and Vc in the current signal mode.

[0074] S302: Determine a vector action sequence corresponding to the simplified matrix converter in the current signal mode according to the three-phase voltage and pre-stored voltage and switch tube sector mapping information.

[0075] It should be understood that in order to reduce the switching loss of the switching tube of the simplified matrix converter, the sector mapping information of the voltage of the three-phase power grid and the switching tube can be determined in advance, so that the vector action sequence corresponding to the simplified matrix converter in the current signal mode can be determined according to the sector where the three-phase voltage is located.

[0076] That is to say, for the three-phase voltage, there must be a size and phase relationship between the instantaneous values ​​of the three-phase voltage. Based on the size and phase relationship of the three-phase voltage, and the size and phase relationship of the three-phase voltage is related to the opening and closing of each switch tube in the simplified matrix converter, then, in order to reduce the opening loss of the switch tube of the simplified matrix converter, the three-phase voltage of the three-phase power grid and the sector mapping information of the voltage and the switch tube can be obtained to match the corresponding vector action sequence of the simplified matrix converter in the current signal mode, that is, determine the order in which the various switch tubes in the simplified matrix converter should be opened and closed in the current signal mode to reduce the switch opening loss of the switch tube of the simplified matrix converter.

[0077] Optionally, the vector action sequence corresponding to the simplified matrix converter in the current signal mode can be determined by matching the pre-stored voltage and the sector mapping information of the switch tube according to the magnitude and phase of the three-phase voltage.

[0078] The sector mapping information is used to indicate the expected on / off state of each switch tube in the simplified matrix converter under different three-phase voltages, and the vector action sequence is used to indicate the two groups of switch tubes that need to be turned on in each adjacent control period of the vector control cycle.

[0079] S303: Determine the vector action information corresponding to each switch tube of the simplified matrix converter in each control period according to the vector action sequence and the pre-stored target power information of the simplified matrix converter.

[0080] It can be understood that after obtaining the vector action sequence, it is determined in which order the simplified matrix converter controls the opening and closing of each switch tube when controlling each switch tube. For the simplified matrix converter, during the operation of the simplified matrix converter, it is not only necessary to reduce the switch opening loss of the switch tube of the simplified matrix converter, but also necessary to make the output of the processing unit meet the working requirements of the load, that is, the voltage or power output by the simplified matrix converter to the load should meet certain expectations, so that the simplified matrix converter can further improve the energy conversion efficiency on the basis of meeting the working requirements of the load.

[0081] Optionally, the vector action information corresponding to each switch tube of the simplified matrix converter in each control period can be calculated according to the vector action sequence and the pre-stored target power information of the simplified matrix converter. The vector action information includes the duty cycle and working current of each switch tube, and the target power information of the simplified matrix converter includes the target current amplitude I r , target current modulation ratio m, target output current I O and the target input current phase angle Specifically, the target current amplitude I r To simplify the amplitude of the matrix converter input phase current, the target output current I O To simplify the average value of the matrix converter output current, the target input current phase angle is the phase angle of the input phase current of the reduced matrix converter.

[0082] S304, controlling the on and off of each switch tube in the simplified matrix converter according to the vector action sequence and the vector action information.

[0083] Optionally, after obtaining the vector action sequence and the vector action information, the control unit in the simplified matrix converter can control each switch in the simplified matrix converter to be turned on and off according to the vector action sequence and the vector action information, so as to process the three-phase voltages Va, Vb and Vc into a rectangular wave with positive and negative origin symmetry, and apply it to the primary winding N1 of the main transformer T1, and transform the rectangular wave with positive and negative origin symmetry of the primary winding N1 to the secondary winding N2 of the main transformer T1 through the main transformer T1, the voltage amplitude of the rectangular wave with positive and negative origin symmetry on the secondary winding N2 has a transformation ratio relationship with the primary winding, and the rectangular wave voltage with positive and negative origin symmetry on the secondary winding N2 outputs a Vout DC voltage through diodes D1-D4 and filter inductor L4 to enable the DC load to work.

[0084] In this embodiment, a plurality of silicon carbide MOS tubes are arranged in the simplified matrix converter as switch tubes, so that the simplified matrix converter obtains the three-phase voltage of the three-phase power grid in the current signal mode, and determines the vector action sequence corresponding to the simplified matrix converter in the current signal mode according to the three-phase voltage and the pre-stored voltage and the sector mapping information of the switch tube, so that the vector action information corresponding to each switch tube of the simplified matrix converter in each control period can be determined according to the vector action sequence and the pre-stored target power information of the simplified matrix converter, so that the on and off of each switch tube in the simplified matrix converter can be controlled according to the vector action sequence and the vector action information, so that the turn-on loss of the switch tube in the simplified matrix converter can be reduced, and the overall efficiency of the simplified matrix converter can be improved.

[0085] Figure 4 A schematic diagram of a flow chart for determining a vector action sequence corresponding to a simplified matrix converter in a bipolar vector control method provided in an embodiment of the present application.

[0086] In one possible implementation, referring to Figure 4 As shown, in the above step S302, according to the three-phase voltage and the pre-stored voltage and the sector mapping information of the switch tube, the vector action sequence corresponding to the simplified matrix converter in the current signal mode is determined, which can be performed according to the following steps, specifically including:

[0087] S401. Determine a vector action sector corresponding to a simplified matrix converter according to three-phase voltages and pre-stored voltage and switch sector mapping information.

[0088] It can be understood that in order to make the switch-on loss of the switch tube of the simplified matrix converter much greater than the switch-off loss, the sector mapping information of the three-phase voltage and the switch tube can be determined in advance, so that the sector in which the three-phase voltage obtained at this time is located can be determined based on the sector mapping information of the three-phase voltage and the voltage and the switch tube, that is, the vector action sector corresponding to the simplified matrix converter.

[0089] S402: Determine a vector action sequence corresponding to the simplified matrix converter according to the vector action sector.

[0090] It can be understood that in order to reduce the turn-on loss of the switching tube of the simplified matrix converter, different vector action sectors correspond to vector action sequences in different vector action sectors. Therefore, after determining the vector action sector, the corresponding vector action sequence of the simplified matrix converter under the current signal mode and the current three-phase voltage can be determined based on the determined vector action sector.

[0091] Optionally, under the determined vector action sector, the vector action sequence of each switch tube in the simplified matrix converter under the current signal mode and the current three-phase voltage can be determined as the corresponding vector action sequence of the simplified matrix converter under the current signal mode and the current three-phase voltage.

[0092] Exemplarily, the vector action sequence of each switch tube in the simplified matrix converter corresponding to each vector action sector can be determined in advance and stored in advance, so that after the vector action sector is determined, the vector action sequence corresponding to the simplified matrix converter can be determined according to the vector action sector.

[0093] For example, taking the current signal mode as an SVPWM signal as an example, the vector action sequence corresponding to the vector action sector and the simplified matrix converter can refer to the following table 1:

[0094] Table 1

[0095]

[0096] Among them, I aa ,I bb ,I cc is the zero vector, subscript 1 corresponds to the upper tube opening, and subscript 2 corresponds to the lower tube opening. Specifically, I ac The upper tubes Q1 and Q2 of phase A are turned on, and the lower tubes Q11 and Q12 of phase C are turned on; I ca The upper tubes Q9 and Q10 of phase C are turned on, and the lower tubes Q3 and Q4 of phase A are turned on; I ab The upper tubes Q1 and Q2 of phase A are turned on, and the lower tubes Q7 and Q8 of phase B are turned on; I ba The upper tubes Q5 and Q6 of phase B are turned on, and the lower tubes Q3 and Q4 of phase A are turned on; I aa The upper tubes Q1 and Q2 of phase A are turned on, and the lower tubes Q3 and Q4 of phase A are turned on.

[0097] For example, when the vector action sector corresponding to the simplified matrix converter is a negative small sector under the large sector I, it can be determined that the vector action sequence corresponding to the simplified matrix converter is I ac →I ab →I aa →I ca →I ba →I aaThat is, when controlling each switch tube in the reduced matrix converter, within a vector control cycle: in the first control period, the A-phase upper tube Q1-Q2 and the C-phase lower tube Q11-Q12 are controlled to be turned on, and the other tubes are turned off; in the second control period, the A-phase upper tube Q1-Q2 and the B-phase lower tube Q7-Q8 are controlled to be turned on, and the other tubes are turned off; in the third control period, the A-phase upper tube Q1-Q2 and the A-phase lower tube Q3-Q4 are controlled to be turned on, and the other tubes are turned off; in the fourth control period, the C-phase upper tube Q9-Q10 is controlled to be turned on, the A-phase lower tube Q3-Q4 is controlled to be turned on, and the other tubes are turned off; in the fifth control period, the B-phase upper tube Q5-Q6 is controlled to be turned on, the A-phase lower tube Q3-Q4 is controlled to be turned on, and the other tubes are turned off; in the sixth control period, the A-phase upper tube Q1-Q2 and the A-phase lower tube Q3-Q4 are controlled to be turned on, and the other tubes are turned off.

[0098] The vector action sector corresponding to the simplified matrix converter is determined by the three-phase voltage and the pre-stored voltage and the sector mapping information of the switch tube, and the vector action sequence corresponding to the simplified matrix converter is determined according to the vector action sector. The vector action sequence corresponding to the simplified matrix converter under the current three-phase voltage and the current signal mode can be accurately determined, thereby realizing that the stress platform of the switch tube in the simplified matrix converter during the opening process is reduced from the minimum to 0, and at the same time, realizing that the stress of the switch tube in the simplified matrix converter during the closing process is increased from 0 to the maximum stress platform, thereby reducing the opening loss of the switch tube in the simplified matrix converter and improving the overall efficiency of the simplified matrix converter.

[0099] In a possible implementation, the step S401 above determines the vector action sector corresponding to the simplified matrix converter according to the three-phase voltage and the pre-stored voltage and switch sector mapping information, including:

[0100] The vector action sector corresponding to the simplified matrix converter is determined according to the magnitude relationship of the three-phase voltages and the pre-stored voltage and sector mapping information of the switch tube.

[0101] Optionally, Figure 5 A schematic diagram of the instantaneous value of the three-phase voltage in the bipolar vector control method provided in the embodiment of the present application, Figure 6 A vector diagram of three-phase voltage in the bipolar vector control method provided in the embodiment of the present application, referring to Figure 5 as well as Figure 6 As shown, according to the magnitude relationship of the three-phase voltage, the opening and closing of each switch tube in the simplified matrix converter can be divided into six large sectors I-VI, and in each large sector, each large sector can be evenly divided into two positive and negative small sectors, so that the sector mapping information of the voltage and the switch tube can be obtained, as shown in the following Table 2:

[0102] Table 2

[0103]

[0104]

[0105] Optionally, after the three-phase voltage is obtained, the magnitude relationship among the first phase Va, the second phase Vb and the third phase Vc in the three-phase voltage can be determined according to the first phase voltage Va, the second phase voltage Vb and the third phase voltage Vc in the three-phase voltage.

[0106] Optionally, after obtaining the magnitude relationship among the first phase Va, the second phase Vb and the third phase Vc in the three-phase voltage, the sector in which the three-phase voltage is located at this time can be matched according to the pre-stored voltage and sector mapping information of the switching tube, that is, the vector action sector corresponding to the simplified matrix converter is determined.

[0107] Exemplarily, taking the three-phase voltage relationship of Va>0>Vc≥Vb as an example, when the three-phase voltage relationship is Va>0>Vc≥Vb, it can be determined that the vector action sector corresponding to the simplified matrix converter is the negative small sector under the large sector I.

[0108] Figure 7 A schematic diagram of a flow chart for determining a vector action sequence corresponding to a simplified matrix converter in a bipolar vector control method provided in an embodiment of the present application.

[0109] In one possible implementation, referring to Figure 7 As shown, in the above step S402, when determining the vector action sequence corresponding to the reduced matrix converter according to the vector action sector, the following steps may be performed, specifically including:

[0110] S701: Determine a plurality of candidate vector action sequences corresponding to a vector action sector.

[0111] It can be understood that there can be multiple vector action sequences within a vector action sector, that is, for any three-phase voltage, when the three-phase voltage is input into the simplified matrix converter, the switches in the simplified matrix converter can be turned on and off in turn in a variety of sequences. Therefore, after determining the vector action sector, multiple vector action sequences to be selected corresponding to the vector action sector can be obtained.

[0112] Optionally, the on and off sequences of the switches in the simplified matrix converter may be arranged and combined to obtain a plurality of vector action sequences to be selected as the plurality of vector action sequences to be selected corresponding to the vector action sectors.

[0113] For example, taking the relationship between the three-phase voltages as Va>0>Vc≥Vb as an example, when it is determined that the vector action sector corresponding to the simplified matrix converter is the negative small sector under the large sector I, the vector action sequence to be selected includes: I ac →I ab →I aa →I ca →I ba →I aa ,I ab →I ac →I aa →I ba →I ca →I aa .

[0114] S702 . According to each action sequence of the vector to be selected, determine the loss information corresponding to each switch tube in the simplified matrix converter under each action sequence of the vector to be selected as the loss information corresponding to each action sequence of the vector to be selected.

[0115] Optionally, after obtaining each candidate vector action sequence, the loss information corresponding to each switch tube in the simplified matrix converter under each candidate vector action sequence can be determined respectively as the loss information corresponding to each candidate vector action sequence, wherein the loss information includes turn-on loss and turn-off loss.

[0116] S703: Determine a vector action sequence corresponding to the simplified matrix converter according to the loss information corresponding to each vector action sequence to be selected.

[0117] Optionally, after obtaining the loss information corresponding to each candidate vector action sequence, the difference between the turn-on loss and the turn-off loss of each candidate vector action sequence can be calculated, so that the candidate vector action sequence with the largest difference between the turn-on loss and the turn-off loss can be used as the vector action sequence corresponding to the simplified matrix converter.

[0118] For example, taking the relationship between the three-phase voltages as Va>0>Vc≥Vb as an example, when the action sequence of the vector to be selected includes: I ac →I ab →I aa →I ca →I ba →I aa ,I ab →I ac →I aa →I ba →I ca →I aa When the vector action sequence corresponding to the simplified matrix converter is I, the loss information of the vector action sequence to be selected can be used to determine that the vector action sequence corresponding to the simplified matrix converter is I ac →I ab →I aa→I ca →I ba →I aa .

[0119] By determining multiple candidate vector action sequences corresponding to the vector action sector, and according to each candidate vector action sequence, determining the loss information corresponding to each switch tube in the simplified matrix converter under each candidate vector action sequence as the loss information corresponding to each candidate vector action sequence, it is possible to determine the vector action sequence corresponding to the simplified matrix converter according to the loss information corresponding to each candidate vector action sequence, and it is possible to ensure that after the determined vector action sequence is applied to the simplified matrix converter, the turn-on loss of the switch tube in the simplified matrix converter is reduced, thereby improving the overall efficiency of the simplified matrix converter.

[0120] Figure 8 A schematic flow chart of determining vector action information corresponding to each switch tube of a simplified matrix converter in each control period in a bipolar vector control method provided in an embodiment of the present application.

[0121] In one possible implementation, referring to Figure 8 As shown, in the above step S303, when determining the vector action information corresponding to each switch tube of the simplified matrix converter in each control period according to the vector action sequence and the pre-stored target power information of the simplified matrix converter, the following steps can be performed, specifically including:

[0122] S801. Determine a first control sub-period and a second control sub-period of a simplified matrix converter according to a vector action sequence.

[0123] Optionally, the vector action sequence is used to indicate two groups of switch tubes that need to be turned on in each adjacent control time period of the vector control cycle. After obtaining the vector action sequence, the vector control cycle of the vector control sequence can be divided to obtain the first control sub-cycle and the second control sub-cycle of the simplified matrix converter.

[0124] For example, taking the relationship between the three-phase voltages as Va>0>Vc≥Vb as an example, it can be determined that the vector action sequence corresponding to the simplified matrix converter is I ac →I ab →I aa →I ca →I ba →I aa At this time, the first control sub-period of the simplified matrix converter can be obtained as I ac →I ab →I aa The control period and the second control sub-period are I ca →I ba →I aaThe control cycle in which it is located.

[0125] S802: Obtain a first vector group corresponding to a first control sub-period and a second vector group corresponding to a second control sub-period.

[0126] Optionally, after determining the first control sub-cycle and the second control sub-cycle, a first vector group corresponding to the first control sub-cycle and a second vector group corresponding to the second control sub-cycle may be obtained, wherein the first vector group includes the first control vector of each control period in the first control sub-cycle, and the second vector group includes the second control vector of each control period in the second control sub-cycle.

[0127] For example, taking the relationship between the three-phase voltages as Va>0>Vc≥Vb as an example, it can be determined that the vector action sequence corresponding to the simplified matrix converter is I ac →I ab →I aa →I ca →I ba →I aa , and the first control sub-period of the simplified matrix converter can be obtained as I ac →I ab →I aa The control period and the second control sub-period are I ca →I ba →I aa Based on this, it can be obtained that the first vector group includes the first control vector I ac ,I ab and I aa The second vector group includes a second control vector I ca ,I ba and I aa .

[0128] S803: Determine vector action information corresponding to each switch tube of the simplified matrix converter in each control period according to the first vector group, the second vector group and the target power information.

[0129] Optionally, after determining the multiple control vectors in the first vector group and the second vector group, the duty cycle and the operating current of each switch tube corresponding to the multiple control vectors in the first vector group and the second vector group can be respectively adjusted according to the target power information, so that after the multiple switch tubes of the simplified matrix converter are switched on and off under the action of the vector action sequence, the simplified matrix converter can process the three-phase voltage, and at the same time, the voltage or power output by the simplified matrix converter to the load should meet the target power information.

[0130] Through the vector action sequence, the first control sub-period and the second control sub-period of the simplified matrix converter are determined, and the first vector group corresponding to the first control sub-period and the second vector group corresponding to the second control sub-period are obtained, so that the vector action information corresponding to the multiple switch tubes of the simplified matrix converter can be determined according to the first vector group, the second vector group and the target power information, and the order in which the switch tubes in the simplified matrix converter should be turned on and off under the current signal mode can be accurately determined, so as to reduce the turn-on loss of the switch tubes in the simplified matrix converter and realize the improvement of the overall efficiency of the simplified matrix converter.

[0131] Fig. 9 Another flowchart diagram of determining vector action information corresponding to each switch tube of a simplified matrix converter in each control period in the bipolar vector control method provided in an embodiment of the present application.

[0132] In a possible implementation, when determining the vector action information corresponding to each switch tube of the simplified matrix converter in each control period according to the first vector group, the second vector group and the target power information in the above step S803, the following steps may be performed, specifically including:

[0133] S901. Determine, according to target power information of a simplified matrix converter, a duty cycle and an operating current corresponding to each first control vector in a first vector group in each control period.

[0134] Optionally, the target current amplitude I in the target power information of the simplified matrix converter can be used. r , target current modulation ratio m, target output current I O and the target input current phase angle , respectively calculate the duty ratio and the operating current corresponding to each first control vector in the first vector group in the respective corresponding control period, so as to obtain the duty ratio and the operating current corresponding to each first control vector in the first vector group in the respective corresponding control period.

[0135] For example, taking the relationship between the three-phase voltages as Va>0>Vc≥Vb as an example, the target current amplitude I in the target power information of the simplified matrix converter can be r , target current modulation ratio m, target output current I O and the target input current phase angle , respectively for the first control vector I in the first vector group ac ,I ab and I aa The duty cycle and working current corresponding to the respective control periods are calculated to obtain the first control vector I ac In the first control vector I acThe duty cycle corresponding to the control period and the working current, the first control vector I ab In the first control vector I ab The duty cycle corresponding to the control period and the working current, the first control vector I aa In the first control vector I aa The duty cycle and operating current corresponding to the control period.

[0136] S902 . Determine the duty ratio and the operating current corresponding to each second control vector in the second vector group in each control period according to the duty ratio and the operating current corresponding to each first control vector in the first vector group in each control period.

[0137] Optionally, after obtaining the duty cycle and operating current corresponding to each first control vector in the first vector group in each control time period, the duty cycle and operating current corresponding to each first control vector in the first vector group in each control time period can be used as the duty cycle and operating current corresponding to each second control vector in the second vector group in each control time period.

[0138] For example, taking the relationship between the three-phase voltages as Va>0>Vc≥Vb as an example, when the first control vector I is obtained ac In the first control vector I ac The duty cycle corresponding to the control period and the working current, the first control vector I ab In the first control vector I ab The duty cycle corresponding to the control period and the working current, the first control vector I aa In the first control vector I aa After the duty cycle and working current corresponding to the control period of the first control vector I ac In the first control vector I ac The duty cycle and working current corresponding to the control period are used as the second control vector I ca In the second control vector I ca The duty cycle and working current corresponding to the control period of the first control vector I ab In the first control vector I ab The duty cycle and working current corresponding to the control period are used as the second control vector I ba In the second control vector I ba The duty cycle and working current corresponding to the control period of the first control vector I aa In the first control vector I aa The duty cycle and working current corresponding to the control period are used as the second control vector I aa In the second control vector I aa The duty cycle and operating current corresponding to the control period.

[0139] S903, using the duty cycle and operating current corresponding to each first control vector in each control period and the duty cycle and operating current corresponding to each second control vector in each control period as vector action information corresponding to each switch tube of the simplified matrix converter in each control period.

[0140] Optionally, after obtaining the duty cycle and operating current corresponding to each first control vector in each control time period and the duty cycle and operating current corresponding to each second control vector in each control time period, the duty cycle and operating current corresponding to each first control vector in each control time period and the duty cycle and operating current corresponding to each second control vector in each control time period can be used as the vector action information corresponding to each switching tube of the simplified matrix converter in each control time period.

[0141] By simplifying the target power information of the matrix converter, the duty cycle and the operating current corresponding to each first control vector in the first vector group in each control period are determined respectively, and according to the duty cycle and the operating current corresponding to each first control vector in the first vector group in each control period, the duty cycle and the operating current corresponding to each second control vector in the second vector group in each control period are determined, so that the duty cycle and the operating current corresponding to each first control vector in each control period and the duty cycle and the operating current corresponding to each second control vector in each control period are used as the vector action information corresponding to each switch tube of the simplified matrix converter in each control period, which can simplify the control logic of each switch tube of the simplified matrix converter, reduce the loss of each switch tube in the switching process, and at the same time, enhance the reliability and stability of the simplified matrix converter.

[0142] Fig.10 A schematic diagram of a flow chart for respectively determining the duty cycle and operating current corresponding to each first control vector in the first vector group in each control period in the bipolar vector control method provided in an embodiment of the present application.

[0143] In one possible implementation, referring to Fig.10 As shown, the target power information of the simplified matrix converter includes a target current amplitude, a target current modulation ratio, a target output current, and a target input current phase angle. In the above step S901, when the duty cycle and the working current corresponding to each first control vector in the first vector group in each control period are determined according to the target power information of the simplified matrix converter, the following steps are included:

[0144] S1001. Determine, according to the target output current in the target power information, a working current corresponding to the first control vector in the corresponding control period.

[0145] Optionally, the operating current corresponding to the first control vector in the corresponding control period may be calculated according to the target output current in the target power information.

[0146] For example, with the first control vector I ab For example, the first control vector I can be calculated using the following formula (1): ab The corresponding working current i in the corresponding control period ab :

[0147]

[0148] For example, with the first control vector I ac For example, the first control vector I can be calculated using the following formula (2): ac The corresponding working current i in the corresponding control period ac :

[0149]

[0150] Among them, I O is the target output current.

[0151] S1002. Calculate the duty cycle of the first control vector in the corresponding control period based on the target current modulation ratio, the target input current phase angle, the working current corresponding to the first control vector in the corresponding control period, the target current amplitude and the target output current in the target power information.

[0152] Optionally, after obtaining the working current corresponding to the first control vector in the corresponding control period, the target current amplitude I r , target current modulation ratio m, target output current I O and the target input current phase angle and the working current corresponding to the first control vector in the corresponding control period, constructing a duty cycle equation corresponding to the first control vector in the corresponding control period, and solving the duty cycle equation to obtain the duty cycle corresponding to the first control vector in the corresponding control period.

[0153] Fig.11 A schematic flow chart of calculating a duty cycle of a first vector and a first control vector in a corresponding control period in a bipolar vector control method provided in an embodiment of the present application.

[0154] In one possible implementation, referring to Fig.11 As shown, in the above step S1002, when calculating the duty cycle corresponding to the first control vector in the corresponding control period according to the target current modulation ratio, the target input current phase angle, the working current corresponding to the first control vector in the corresponding control period, the target current amplitude and the target output current in the target power information, the following steps can be performed, including:

[0155] S1101. Construct a first duty cycle equation corresponding to the first control vector in the corresponding control period according to the target current amplitude, the working current corresponding to the first control vector in the corresponding control period, the target input current phase angle and the action direction of the first control vector.

[0156] For example, Fig.12 Another vector diagram of three-phase voltage in the bipolar vector control method provided in the embodiment of the present application, referring to Fig.12 As shown, it should be understood that in a certain control period, the current output by the simplified matrix converter should meet the target current amplitude I r Therefore, the magnitude relationship of the three-phase voltage is Va>0≥Vb>Vc and the first control vector I ab For example, that is, the vector action sector is a positive small sector of the large sector I, and the target current amplitude I r , the first control vector I ab The corresponding working current i in the corresponding control period ab , target input current phase angle And the direction of action of the first control vector, the first control vector I is constructed ab The first duty cycle equation corresponding to the corresponding control period is expressed by the following formula (3):

[0157]

[0158] Among them, d ab is the first control vector I ab The corresponding duty cycle in the corresponding control period.

[0159] For example, the magnitude relationship of the three-phase voltage is Va>0≥Vb>Vc and the first control vector I ac For example, that is, the vector action sector is a positive small sector of the large sector I, and the target current amplitude I r , the first control vector I ac The corresponding working current i in the corresponding control period ac , target input current phase angle And the direction of action of the first control vector, the first control vector I is constructed ac The first duty cycle equation corresponding to the corresponding control period is expressed by the following formula (4):

[0160]

[0161] Among them, d ac is the first control vector I ac The corresponding duty cycle in the corresponding control period.

[0162] S1102: construct a second duty cycle equation corresponding to the first control vector in a corresponding control period according to the target current modulation ratio, the target input current phase angle, and the action direction of the first control vector.

[0163] For example, continue to refer to Fig.12 As shown, the magnitude relationship of the three-phase voltage is Va>0≥Vb>Vc and the first control vector I ab For example, the vector action sector is a positive small sector of the large sector I, and the target current modulation ratio m and the target input current phase angle , the first control vector I ab The corresponding working current i in the corresponding control period ab And the direction of action of the first control vector, the first control vector I is constructed ab The second duty cycle equation corresponding to the corresponding control period is expressed by the following formula (5):

[0164]

[0165] Among them, d ab is the first control vector I ab The corresponding duty cycle in the corresponding control period.

[0166] For example, continue to refer to Fig.12 As shown, the magnitude relationship of the three-phase voltage is Va>0≥Vb>Vc and the first control vector I ac For example, the vector action sector is a positive small sector of the large sector I, and the target current modulation ratio m and the target input current phase angle , the first control vector I ac The corresponding working current i in the corresponding control period ac And the direction of action of the first control vector, the first control vector I is constructed ac The second duty cycle equation corresponding to the corresponding control period is expressed as follows:

[0167]

[0168] Among them, d ac is the first control vector I ac The corresponding duty cycle in the corresponding control period.

[0169] For example, the magnitude relationship of the three-phase voltage is Va>0≥Vb>Vc and the first control vector I aa For example, that is, the vector action sector is a positive small sector of the large sector I, and the first control vector I aa The duty cycle d corresponding to the corresponding control period aa It can be calculated using the following formula (7):

[0170]

[0171] Among them, d ab is the first control vector I ab The duty cycle corresponding to the corresponding control period, d ac is the first control vector I ac The corresponding duty cycle in the corresponding control period.

[0172] S1103 , solving the first duty cycle equation and the second duty cycle equation to obtain a duty cycle of the first control vector in a corresponding control period.

[0173] For example, after obtaining the first duty cycle equation and the second duty cycle equation, the first duty cycle equation and the second duty cycle equation can be solved in combination with the following current modulation ratio formula to obtain the duty cycle corresponding to the first control vector in the corresponding control period. The current modulation ratio formula is shown in the following formula (8):

[0174]

[0175] Among them, I r is the target current amplitude, I O is the target output current.

[0176] Exemplarily, when the vector action sector is a negative small sector of the large sector I, the second control vector I ca The duty cycle d corresponding to the corresponding control period ca It can be expressed using the following formula (8):

[0177]

[0178] Exemplarily, when the vector action sector is a negative small sector of the large sector I, the second control vector I ba The duty cycle d corresponding to the corresponding control period ba It can be expressed using the following formula (9):

[0179]

[0180] Exemplarily, when the vector action sector is a negative small sector of the large sector I, the second control vector I aa The duty cycle d corresponding to the corresponding control period aa It can be expressed using the following formula (10):

[0181]

[0182] Exemplarily, by analogy, the duty cycle of each control vector in different vector action sectors may be determined respectively.

[0183] For example, when the vector action sector is large sector II, the duty ratio of each control vector in the corresponding control period can be obtained as shown in the following formulas (11)-(13):

[0184]

[0185]

[0186]

[0187] For example, when the vector action sector is large sector III, the duty ratio of each control vector in the corresponding control period can be obtained as shown in the following formulas (14)-(16):

[0188]

[0189]

[0190]

[0191] For example, when the vector action sector is large sector III, the duty ratio of each control vector in the corresponding control period can be obtained as shown in the following formulas (17)-(19):

[0192]

[0193]

[0194]

[0195] For example, when the vector action sector is large sector III, the duty ratio of each control vector in the corresponding control period can be obtained as shown in the following formulas (20)-(22):

[0196]

[0197]

[0198]

[0199] For example, when the vector action sector is large sector III, the duty ratio of each control vector in the corresponding control period can be obtained as shown in the following formulas (23)-(25):

[0200]

[0201]

[0202]

[0203] For example, the inductance of the filter inductors L1-L3 of the processing unit of the simplified matrix converter is 1.3mH, the inductance of the filter inductor L4 is 2mH, the capacitance of the filter capacitors C1-C3 is 30uF, the filter capacitor C4 is 800uF, the output voltage Vout is 500V, and the transformation ratio N1:N2 of the transformer T1 is 20:25.

[0204] For example, when the three-phase voltage of the power grid is detected to be Va=294.264VAC, Vb=-234.294VAC, Vc=-59.9702VAC, it can be determined that the vector action sequence corresponding to the simplified matrix converter in the current signal mode at this time is I ac →I ab →I aa →I ca →I ba →I aa , the duty cycle data obtained at this time is: d ab =d ba =32%, d ac =d ca =8%, d aa =9%.

[0205] For example, Fig.13 A schematic diagram of the primary winding voltage of the main transformer in the bipolar vector control method provided in the embodiment of the present application, referring to Fig.13 As shown, at time t1-t2, the A-phase upper tubes Q1 and Q2 and the C-phase lower tubes Q11 and Q12 are turned on, t1=0.06393999999999819S, t2=0.0639415884160399S, the duty cycle is 8.1422%, and the primary voltage of the transformer is V1=278.774V.

[0206] For example, continue to refer to Fig.13 As shown, at time t2-t3, the A-phase upper tubes Q1 and Q2 and the B-phase lower tubes Q7 and Q8 are turned on for t3=0.06394799999999981S, with a duty cycle of 32.0579%, and the transformer primary voltage is V2=519.245V.

[0207] For example, continue to refer to Fig.13 As shown, at time t3-t4, the A-phase upper tubes Q1 and Q2 and the A-phase lower tubes Q3 and Q4 are turned on, t4=0.06394999999999981S, the duty cycle is 9.7998%, and the primary voltage of the transformer is 0.

[0208] For example, continue to refer to Fig.13 As shown, at time t4-t5, the upper tubes Q9 and Q10 of phase C and the lower tubes Q3 and Q4 of phase A are turned on, t5=0.0639515884160399S, the duty cycle is 8.1422%, and the primary voltage of the transformer is V3=-V1=-278.774V.

[0209] For example, continue to refer to Fig.13 As shown, at time t5-t6, the upper tubes Q5 and Q6 of phase B and the lower tubes Q3 and Q4 of phase A are turned on, t6=0.06395799999999981S, the duty cycle is 32.0579%, and the primary voltage of the transformer is V4=-V2=-519.245V.

[0210] For example, continue to refer to Fig.13 As shown, at time t6-t7, the A-phase upper tubes Q1 and Q2 and the A-phase lower tubes Q3 and Q4 are turned on, t7=0.06395999999999981S, the duty cycle is 9.7998%, and the primary voltage of the transformer is 0.

[0211] Based on the same inventive concept, a simplified matrix converter is also provided in the embodiment of the present application. Figure 1 as well as Figure 2 As shown, the simplified matrix converter includes: a control unit and a plurality of switch tubes, each of which is a MOS tube.

[0212] The control unit performs on-off control of the multiple switch tubes based on the above-mentioned bipolar vector control method.

[0213] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned bipolar vector control method are executed.

[0214] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in this application. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0215] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or part of the technical solution that contributes to the prior art or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program code.

[0216] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A bipolar vector control method, characterized in that: Applied to a simplified matrix converter, the simplified matrix converter includes a plurality of switch tubes, each of which is a metal-oxide semiconductor field effect transistor, and the method includes: In the current signal mode, the three-phase voltage of the three-phase power grid is obtained; Determine a vector action sequence corresponding to the reduced matrix converter in the current signal mode according to the three-phase voltage and pre-stored voltage and switch tube sector mapping information, wherein the sector mapping information is used to indicate the expected on-off state of each switch tube in the reduced matrix converter under different three-phase voltages, and the vector action sequence is used to indicate two groups of switch tubes that need to be turned on in each control period that is successively adjacent to each other in a vector control cycle; Determine, according to the vector action sequence and the pre-stored target power information of the simplified matrix converter, the vector action information corresponding to each switch tube of the simplified matrix converter in each control period, wherein the vector action information includes the duty cycle and the operating current of each switch tube; According to the vector action sequence and the vector action information, the on and off of each switch tube in the simplified matrix converter is controlled.

2. The bipolar vector control method according to claim 1, characterized in that: The step of determining the vector action sequence corresponding to the reduced matrix converter in the current signal mode according to the three-phase voltage and the pre-stored voltage and switch tube sector mapping information includes: Determine the vector action sector corresponding to the simplified matrix converter according to the three-phase voltage and pre-stored voltage and switch tube sector mapping information; According to the vector action sector, a vector action sequence corresponding to the reduced matrix converter is determined.

3. The bipolar vector control method according to claim 2, characterized in that: The step of determining the vector action sector corresponding to the simplified matrix converter according to the three-phase voltage and pre-stored voltage and switch tube sector mapping information includes: The vector action sector corresponding to the simplified matrix converter is determined by matching the magnitude relationship of the three-phase voltages and the pre-stored voltage and sector mapping information of the switch tube.

4. The bipolar vector control method according to claim 2, characterized in that: The step of determining the vector action sequence corresponding to the reduced matrix converter according to the vector action sector comprises: Determine a plurality of to-be-selected vector action sequences corresponding to the vector action sector; According to each of the candidate vector action sequences, determining the loss information corresponding to each switch tube in the simplified matrix converter under each of the candidate vector action sequences as the loss information corresponding to each of the candidate vector action sequences; The vector action sequence corresponding to the simplified matrix converter is determined according to the loss information corresponding to each of the to-be-selected vector action sequences.

5. The bipolar vector control method according to claim 1, characterized in that: Determining the vector action information corresponding to each switch tube of the simplified matrix converter in each control period according to the vector action sequence and the pre-stored target power information of the simplified matrix converter includes: Determining a first control sub-period and a second control sub-period of the reduced matrix converter according to the vector action sequence; Acquire a first vector group corresponding to the first control sub-cycle and a second vector group corresponding to the second control sub-cycle, wherein the first vector group includes the first control vectors of each control period in the first control sub-cycle, and the second vector group includes the second control vectors of each control period in the second control sub-cycle; According to the first vector group, the second vector group and the target power information, vector action information corresponding to each switch tube of the simplified matrix converter in each control period is determined.

6. The bipolar vector control method according to claim 5, characterized in that: The determining, according to the first vector group, the second vector group and the target power information, vector action information corresponding to each switch tube of the reduced matrix converter in each control period includes: According to the target power information of the simplified matrix converter, respectively determining the duty cycle and the operating current corresponding to each first control vector in the first vector group in each control period; Determine the duty ratio and the operating current corresponding to each second control vector in the second vector group in each control period according to the duty ratio and the operating current corresponding to each first control vector in the first vector group in each control period; The duty cycle and operating current corresponding to each of the first control vectors in each control period and the duty cycle and operating current corresponding to each of the second control vectors in each control period are used as vector action information corresponding to each switch tube of the simplified matrix converter in each control period.

7. The bipolar vector control method according to claim 6, characterized in that: The target power information of the simplified matrix converter includes a target current amplitude, a target current modulation ratio, a target output current and a target input current phase angle; The step of determining the duty cycle and the operating current corresponding to each first control vector in the first vector group in each control period according to the target power information of the simplified matrix converter comprises: Determine, according to the target output current in the target power information, a working current corresponding to the first control vector in a corresponding control period; The duty cycle of the first control vector is calculated based on the target current modulation ratio, the target input current phase angle, the working current corresponding to the first control vector in the corresponding control period, the target current amplitude and the target output current in the target power information.

8. The bipolar vector control method according to claim 7, characterized in that: The step of calculating the duty cycle of the first control vector according to the target current modulation ratio, the target input current phase angle, the working current corresponding to the first control vector in the corresponding control period, the target current amplitude, and the target output current in the target power information includes: Constructing a first duty cycle equation corresponding to the first control vector in the corresponding control period according to the target current amplitude, the working current corresponding to the first control vector in the corresponding control period, the target input current phase angle, and the action direction of the first control vector; According to the target current modulation ratio, the target input current phase angle and the action direction of the first control vector, a second duty cycle equation corresponding to the first control vector in the corresponding control period is constructed; The first duty cycle equation and the second duty cycle equation are solved to obtain a duty cycle of the first control vector in a corresponding control period.

9. A simplified matrix converter, characterized in that: include: A control unit and multiple switch tubes, each of which is a MOS tube; The control unit performs on-off control of the multiple switch tubes based on the method steps described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the bipolar vector control method according to any one of claims 1 to 8 are executed.

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