회전좌표계를 이용한 단상능동전력필터의 제어이론

초록

The major cause of power quality deterioration are harmonic current throught semiconductor switching device, due to use of nonlinear loads such as diodes rectifier or thyristor rectifier. In response to this concerns, this paper presents a new control mothod of Single-Phase Active Power(APF) for the compensation of harmonic current components in nonlinear loads. In order to make the complex calculation to be possible, the Single-Phase system that has two phases was made by constructing a imaginary second-phase giving time delay to load current. In the conventional method, a imaginary-phase lagged to the load current T/4(here T is the fundamental cycle) was made. But in this proposed mothed, the new signal, which has the delayed phase through the filter, using the phase-delay property of low-pass filter, was used as the second phase. As this control method is applied to the system of single phase, an instantaneous calculation was done rather by using the rotating reference frames that synchronizes with source frequency than by applying instantaneous reactive power theory that uses the conventional fixed reference frame.