Patent ID: 7855526
Filing Date: 2010-12-21
Classification: H02M,H02P

Abstract:
1. A power conversion controlling apparatus that controls a power converting unit connected between a DC circuit and an AC circuit including an AC electromotive force source to exchange power between DC and AC with a switching device based on a detection signal detected by a current detector of a current flowing through the AC circuit, comprising: a frequency computing unit that determines an operating frequency of the power converting unit to output an operating frequency signal; an integral computing unit that computes a phase angle signal by integration from the output of the frequency computing unit to output the phase angle signal; an orthogonal biaxial transforming unit that computes a biaxial current of an active component and a reactive component by orthogonal biaxial transformation based on the detection signal of the current detector and the phase angle signal of the integral computing unit to output the biaxial current; a biaxial current setting unit that determines a command value of the biaxial current to output the command value; a biaxial current controlling unit that computes an amount of error from a difference between the output of the orthogonal biaxial transforming unit and that of the biaxial current setting unit to output an amplitude command value according to the amount of error for each biaxial component; and a PWM signal generating unit that generates a PWM signal controlling the power converting unit based on the output of the biaxial current controlling unit and the phase angle signal of the integral computing unit, wherein the frequency computing unit determines the operating frequency of the power converting unit so as to lead the amplitude command value corresponding to a reactive component of current among the amplitude command values output by the biaxial current controlling unit to zero.