UNBALANCED VOLTAGE COMPENSATION METHOD, UNBALANCED VOLTAGE COMPENSATOR, THREE-PHASE CONVERTER CONTROL METHOD, AND CONTROLLER OF THREE-PHASE CONVERTER

摘要

PURPOSE: An unbalanced voltage compensation method, an unbalanced voltage compensator, a three-phase converter control method, and a controller of the three-phase converter are provided to extract an instantaneous value of an Y phase voltage in an Y connection from the instantaneous value from a line voltage. CONSTITUTION: An unbalance voltage compensation device(1) comprises a center vector calculation unit(10), a symmetric coordinate component calculation part, and an adding unit. The center vector calculation unit calculates an Y-voltage having 120 phase difference from each line voltage. The symmetric coordinate component calculation part calculates the symmetric component voltage of a three phase equilibrium system The three-phase ac current voltage is changed through PWM and generates a control signal for outputting DC voltage.