US 11,888,386 B2
Power conversion device
Tetsuya Kojima, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/602,844
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed May 23, 2019, PCT No. PCT/JP2019/020535
§ 371(c)(1), (2) Date Oct. 11, 2021,
PCT Pub. No. WO2020/235101, PCT Pub. Date Nov. 26, 2020.
Prior Publication US 2022/0149751 A1, May 12, 2022
Int. Cl. H02M 1/12 (2006.01); H02M 7/5387 (2007.01); H02M 7/5395 (2006.01); H02M 7/483 (2007.01)
CPC H02M 1/123 (2021.05) [H02M 7/483 (2013.01); H02M 7/5395 (2013.01); H02M 7/53875 (2013.01); H02M 7/4835 (2021.05)] 8 Claims
OG exemplary drawing
 
1. A power conversion device that converts direct current power into alternating current power for a load, and supplies the alternating current power to the load, the power conversion device comprising:
a three-phase three-level inverter connected between positive and negative terminals of a direct current power supply;
three single-phase inverters respectively connected between the load and alternating current terminals of respective phases different from one another, of the three-phase three-level inverter; and
a controller to generate gate signals for controlling operation of the three-phase three-level inverter and of the three single-phase inverters, based on sinusoidal phase voltage commands, wherein
the controller
divides the sinusoidal phase voltage commands into three-phase instantaneous voltage commands to be indicated to the three-phase three-level inverter and mean voltage commands to be indicated to the respective three single-phase inverters, and
in a case in which a sum of the three-phase instantaneous voltage commands is a positive value, superimposes a common voltage component on each of the three mean voltage commands to make a sum of the three mean voltage commands a non-positive value, or
in a case in which the sum of the three-phase instantaneous voltage commands is a negative value, superimposes the common voltage component on each of the three mean voltage commands to make the sum of the three mean voltage commands a non-negative value.