Generalized Active Power Filter and its Adaptive Instrutional Current Detection

The generalized active power filter(GAPF) is a new kind of active power filter that can compensate reactive power, asymmetry three-phase power, harmonic and inter-harmonic and has an extensive applicability. A GAPF and its instructional current detection arithmetic are studied in this paper. The main circuit, operation principles and instructional current detection arithmetic of GAPF are introduced and the results of a simulation and experiment on the GAPF are given. Here, a six-bridge arm PWM convertor with advanced IGBTs is utilized to actualize the main circuit of a GAPF that the agility of the operation of the GAPF is improved and convenience of the utilizing of series and multiple techniques to increase the capability of GAPF. An improved adaptive instructional current detection method utilizing a phase locked logic(PLL) to produce the reference voltage is proposed. The proposed method can eliminate the influence from voltage aberrance of electrical network to the effect of instructional current detection. Finally, through computer simulation and actual experiments, it is proved that the proposed GAPF and improved adaptive instructional current detection method have many advantages.