Pulse width moldulation control system for electric power converter

摘要

In pulse width modulation control for an electric power converter, occurrence of lower order harmonics, in order to suppress fractional order harmonics and direct current component even in a condition where a carrier frequency is several times as small as a frequency of a command value, pulse width modulation pulses for driving semiconductor elements composing an electric converter are calculated by comparing a command signal from a command value generating means with a carrier signal of a continuous triangular-wave having a constant period, which comprises a means for separately calculating a command value of the command signal from the command value generating means and a time product of the pulse width modulation pulses and calculating a difference value between the both time products, the pulse width modulation pulse being calculated by the difference value to the command signal from the command value generating means. <IMAGE>