The Stability Analysis and Control Strategies of Multiparalleled SAPFs: A Comprehensive Overview

An active power filter (APF) is a power electrical equipment 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 first compare several commonly used APF techniques and highlight the advantages of a 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 merits and demerits of various algorithms. Based on the technologies related to a single SAPF, we introduce the modeling and stability analysis methods of the multiparalleled SAPF 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.