Switching-loss reduction technique in active power filters without auxiliary circuits

• Published in: IET power electronics Vol. 9; no. 4; pp. 728 - 742
• Main Authors: Lam, Chi-Seng, Wong, Man-Chung, Dai, Ning-Yi, Choi, Wai-Hei, Cui, Xiao-Xi, Chung, Chi-Yung
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 30.03.2016
• Subjects: active power filter system switching loss reduction; adaptive control; adaptive dc‐link voltage controller; APF systems; apparent power 5 kVA; Compensation; current harmonics compensation; current quality compensation; design criteria; economic benefits; Economics; electric current control; Electronics; fundamental frequencies analysis; harmonic analysis; harmonic frequencies analysis; Harmonics; minimum dc‐link operating voltage; Noise; PI control; power harmonic filters; power supply quality; proportional‐and‐integral gains; reactive power compensation; reactive power control; soft‐switching techniques; Strategy; Switching; switching noise reduction control strategy; switching‐loss reduction technique; system initial cost; voltage 110 V; voltage control; Voltage controllers; power harmonic filters; current quality compensation; economic benefits; reactive power compensation; electric current control; adaptive dc-link voltage controller; current harmonics compensation; soft-switching techniques; fundamental frequencies analysis; apparent power 5 kVA; PI control; active power filter system switching loss reduction; system initial cost; design criteria; adaptive control; APF systems; switching noise reduction control strategy; harmonic frequencies analysis; voltage 110 V; harmonic analysis; minimum dc-link operating voltage; power supply quality; switching-loss reduction technique; proportional-and-integral gains; reactive power control; voltage control
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2014.0864

To reduce the active power filter (APF) system switching loss, the usual method is to apply different soft-switching techniques. However, this would increase the system initial cost. In this study, a switching loss and switching noise reduction control strategy for APF under reactive power and current harmonics compensation is proposed, which can be applied to the existing APF systems in worldwide, thus causing economic benefits. The minimum dc-link operating voltage of APF is computed through both fundamental and harmonic frequencies analysis. Then an adaptive dc-link voltage controller for the APF is proposed, such that the compensating range of the APF is adaptively varied according to the variation of the loading. Thus, the switching loss and switching noise of the APF can be lowered. Moreover, the design criteria of the proportional and integral gains of the adaptive dc voltage controller are presented and discussed. Finally, simulation and experimental results of a 110 V, 5 kVA APF experimental prototype are given to prove the validity of the proposed control strategy for the APF in current quality compensation, and at the same time reducing switching loss and switching noise during operation.