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A Novel Series APF Based on Fundamental and Selected Harmonics Magnetic Flux Hybrid Control

The low-order harmonics with large contents are first to be dealt with in power system; The filtering performance of series hybrid active power filter (SHAPF) based on fundamental magnetic flux compensation (FMFC) positively correlates with the magnetizing impedance of the series transformer, however, excessive magnetizing impedance will decrease reliability while increasing capacity and costs of the whole system. In order to achieve better filtering performance without increasing the magnetizing impedance of the transformer, a novel series active power filter (NSAPF) based on both fundamental and selective harmonics magnetic flux hybrid control is presented in the paper. A proportional resonance (PR) controller is implemented in NSAPF, and the proposed NSAPF presents very low leakage impedance to fundamental, super-high impedance to selected harmonics and high magnetizing impedance to other harmonics, playing a role of “harmonic isolator”. Compared with SHAPF based on FMFC, the proposed NSAPF can achieve better filtering performance while applying same transformer; and a transformer with smaller capacity can be applied in NSAPF while achieving same filtering performance. The model of a three-phase NSAPF was built on MATLAB/Simulink and related simulation results verified the effectiveness of the proposed NSAPF.