The Stability Analysis and Control Strategies of Multiparalleled SAPFs: A Comprehensive Overview
Zhaokang Wu, Guoqing Xu, Wei Zhu, Gang Sheng
Abstract
Active power filter (APF) is a power electrical equip-ment that possesses the functions of harmonic suppression and reactive power compensation in the power grid. Its performance is closely related to the adopted topology, harmonic current detection techniques, and harmonic current control methods. In order to promote the use of APF technology in a wider range of industrial applications, we firstly compare several commonly used APF techniques and highlight the advantages of shunt active power filter (SAPF) in high-capacity applications. Then, we summarize the harmonic current detection techniques, harmonic current control techniques, and resonance suppression techniques of a single SAPF module, and comprehensively compare the merit and demerits of various algorithms. Based on the technologies related to a single SAPF, we introduce the modeling and stability analysis methods of multiparalleled SAPFs system and discuss the existing problems from multiple perspectives. Finally, we provide a detailed description of parallel operation strategies of multiparalleled SAPFs, highlight the advantages, disadvantages, and application scope of various schemes, and prospect the future development of this field.