직렬형 단상 하이브리드 능동전력필터의 새로운 제어법

초록

This paper deals with the novel control algorithm of single-phase hybrid active power filter for the compensation of harmonic current components in in nonlinear R-L load with passive active power filter. To construct two-axes coordinate, an imaginary second phase was made by giving time delay to line current. In this proposed mothed, the new signal, which has the delayed through the filtering by the phase-delay property of low-pass filter, is used as the secondary phase. Because two phases have different phase, instantaneous calculation of harmonic current is possible. In this paper, a reference voltage is created by multiplying gain of filter by compensation current using the rotating reference frames that synchronizes with source-frequency, not applying instantaneous reactive power theory which has been used with the existing fixed reference frame. This paper shows the experimental results, which provide a high accuracy and extremely fast response of single-phase hybrid active power filter under the operation with the proposed control method.