Control device for power conversion device, power conversion device, electric motor drive system using said devices, compressor drive system, and gas turbine power generation system
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United States of America Patent
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Sep 25, 2018
Grant Date -
Jan 25, 2018
app pub date -
Feb 16, 2015
filing date -
Feb 16, 2015
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Abstract
A control device for power conversion device controls a power conversion device in a system driven by the power conversion device to which an electric motor outputs AC power, and includes: a control pulse generation unit configured to generate a control pulse of the power conversion device; and a negative phase creation unit configured to input a pulse signal output by the control pulse generation unit and rotational speed information of the electric motor, and to generate an inverted signal of an output signal of the control pulse generation unit, wherein the pulse signal of a half cycle during one cycle of voltage, the pulse signal being generated by the control pulse generation unit, and a pulse signal of a next half cycle during the one cycle of voltage, the pulse signal being generated by the negative phase creation unit, are symmetrical in positive and negative relationship of voltage.
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