POWER CONVERSION DEVICE CONTROL DEVICE, POWER CONVERSION DEVICE, ELECTRIC MOTOR DRIVE SYSTEM USING SAID DEVICES, COMPRESSOR DRIVE SYSTEM, AND GAS TURBINE POWER GENERATION SYSTEM

摘要

In a system in which an electric motor (5) is driven by a power conversion device (3A) that outputs an AC power, a power conversion device control device (7A) controls the power conversion device and is provided with: a control pulse generation unit (70 to 73) for generating control pulses for the power conversion device (3A); and a negative phase creation unit (74) for receiving a pulse signal output from the control pulse generation unit and rotational speed information (ω) of the electric motor and generating an inverted signal of the output signal from the control pulse generation unit. The pulse signal generated in a half cycle of one voltage cycle period by the control pulse generation unit and the pulse signal generated in the next half-cycle of the one voltage cycle by the negative phase creation unit are symmetrical in terms of the positive-negative voltage relationship.