Patent ID: 11870382
Assignee: DELTA ELECTRONICS, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A control method for a matrix power conversion device, wherein the matrix power conversion device comprises a plurality of three-phase switching modules configured to switch the three-phase input power to generate a three-phase output power, each of the plurality of three-phase switching module comprises a plurality of bidirectional switches, each of the plurality of bidirectional switches in each of the plurality of three-phase switching modules is connected to a corresponding input phase voltage of the three-phase input power, each of the plurality of three-phase switching modules outputs a corresponding output phase voltage of the three-phase output power, wherein the control method comprises:
acquiring all input phase voltages of the three-phase input power;
determining a maximum voltage, an intermediate voltage and a minimum voltage among all the input phase voltages to acquire a waveform of a control carrier wave in a switching cycle;
acquiring output expected values corresponding to all output phase voltages of the three-phase output power respectively;
comparing the waveform of the control carrier wave with all the output expected values respectively for acquiring a turning-on time of each of the plurality of bidirectional switches; and
switching the three-phase input power to change the three-phase output power for driving a motor according to the turning-on time of each of the plurality of bidirectional switches,
wherein the waveform of the control carrier wave comprises a first linear carrier wave and a second linear carrier wave, and the control method further comprises:
acquiring a time ratio value according to the maximum voltage, the intermediate voltage and the minimum voltage;
multiplying the switching cycle by the time ratio value to acquire a first switching interval of the switching cycle; and
subtracting the first switching interval from the switching cycle to acquire a second switching interval of the switching cycle,
wherein the first switching interval is a cycle variation of the first linear carrier wave, and the second switching interval is a cycle variation, of the second linear carrier wave, wherein the control method further comprises:
selecting one of the input phase voltages with the largest absolute voltage value to be a base voltage command; and
identifying whether the base voltage command is positive or negative, and determining a voltage variation of the first linear carrier wave and a voltage variation of the second linear carrier waves according to identifying result,

wherein if it is identified that the base voltage command is positive, the control method further comprises:
calculating a first voltage difference between the maximum voltage and the intermediate voltage:
calculating a second voltage difference between the maximum voltage and the minimum voltage; and
calculating the time ratio value according to the first voltage difference, the second voltage difference, the intermediate voltage and the minimum voltage,
wherein when the base voltage command is positive, the first voltage difference is the voltage variation of the first linear carrier wave, and the second voltage difference is the voltage variation of the second linear carrier wave; wherein a slope of the first linear carrier wave is negative, and a slope of the second linear carrier wave is positive.