CONTROL CIRCUIT FOR POWER CONVERSION CIRCUIT, AND SYSTEM INTERCONNECTION INVERTER SYSTEM AND THREE-PHASE PWM CONVERTER SYSTEM USING THE CONTROL CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a control circuit that performs such processing as is same as resting coordinate transformation of harmonic compensation signals generated by predetermined control following rotating coordinate transformation and as has linear time invariance.

SOLUTION: A control circuit 7 includes: a three-phase-to-two-phase conversion section 73 for converting three-phase current signals to an α axis current signal and a β axis current signal; a fifth harmonic compensation section 81 for applying signal processing by a first transfer function and phase adjustment processing to each of the α axis current signal and the β axis current signal to generate a first harmonic compensation signal and a second harmonic compensation signal; and a two-phase-to-three-phase conversion section 76 and a PWM signal generation section 77 for generating PWM signals on the basis of the first harmonic compensation signal and the second harmonic compensation signal. The first transfer function is G(s)=äF(s+j*5*ω0)+F(s-j*5*ω0)}/2, where F(s) is a transfer function representing predetermined control processing.

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