| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, in PWM control of a serial multiple inverter, an inhibition zone is provided for preventing a two-stage change from being generated in the vicinity of an area boundary in accordance with a voltage command in the case where a CPS system is used, and an upper limit of a carrier frequency may be restricted by influences of the inhibition zone.SOLUTION: An inhibition zone avoidance processing part is provided between a CPS control part and a dead time generation part. In the case of high frequency braking, voltage command values of any two phases among three-phase voltage commands are applied equally, and avoidance processing of an inhibition zone is performed by the inhibition zone avoidance processing part. A rotation reference phase for the voltage command values of any two phases to which the equal voltage command value is applied, is fixed without being temporally changed, such that an upper limit value of a carrier frequency is increased while avoiding an inhibition zone. |
