Three-phase frequency converter, and dead zone compensation circuit and dead zone compensation method for the same

摘要

A dead zone compensation circuit includes: a coordinate transformation module configured to perform a coordinate transformation on three-phase output currents of the three-phase frequency converter based on a given angle, for transforming the three-phase output currents from a three-phase static coordinate to a two-phase rotary coordinate to obtain a reactive current component of the three-phase output currents; a filter module configured to obtain a reactive current fluctuation amount; an error calculation module configured to calculate an error between the reactive current fluctuation amount and a zero value; a regulation and control module configured to regulate and control the reactive current fluctuation amount based on the error, for obtaining a voltage regulation variation; and a summing module configured to add the voltage regulation variation to a reference voltage, for obtaining a regulated voltage, the regulated voltage being used to generate a driving signal for the three-phase frequency converter.