CURRENT CONTROL TYPE POWER CONVERTER AND OUTPUT CURRENT WAVEFORM IMPROVING METHOD OF CURRENT CONTROL TYPE POWER CONVERTER

摘要

PROBLEM TO BE SOLVED: To provide a current control type power converter of a three-phase four-wire system to improve a distortion of an output current waveform.;SOLUTION: A harmonic shift portion 4 acquires a shifted tertiary harmonic voltage component V3' obtained by shifting a tertiary harmonic voltage component V3 with a phase voltage waveform Vu as a reference for a prescribed period of time Δt. A signal subtracting portion 4 acquires a subtraction signal ΔI3 by multiplying the tertiary harmonic voltage component V3' by a gain K1 and acquires current command signals Iux to Iwx corrected for three phases by subtracting the subtraction signal ΔI3 from current command signals Iu_ref to Iw_ref for three phases used for feedback control. A gate signal generating circuit 2 outputs a gate signal to 6 semiconductor switching elements of a three-phase inverter circuit IV based on the current command signals Iux to Iwx corrected for three phases.;COPYRIGHT: (C)2010,JPO&INPIT