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Seven Level Inverter Based Shunt Hybrid Active Power Filter Topology for Harmonic Reduction

G. Jayakrishna, B.Vamsipriya

This paper presents a three-phase asymmetric cascaded seven level inverter (ACSLI) based Shunt Hybrid Active Power Filter (SHAPF) topology for harmonic reduction in medium voltage test system (MVTS). The proposed SHAF topology consists of ACSLI based shunt active power filter (SAPF) and shunt passive filters (SPF) connected in parallel with the load. The SHAPF topology compensates harmonic currents drawn by non-linear load. The compensation process is based on concept of synchronous reference frame theory (SRFT) used for reference compensation current estimation, carrier switching frequency sub-harmonic pulse width modulation (CSFSHPWM) for generating switching signals for ACSLI, fuzzy logic controller (FLC) for maintaining DC bus capacitor voltage constant. Three types of shunt passive filters namely single tuned, double tuned and high pass filter are used individually for enhancing the harmonic filtering performance of ACSLI based SAPF. The proposed SHAPF topology is validated through MATLAB/SIMULINK simulation for MVTS and the results were presented.