A new hybrid series active filter configuration to compensate voltage sag, swell, voltage and current harmonics and reactive power

Abstract

This paper proposes a new system configuration for a series hybrid power filter (SHPF) realized for all harmonic types of loads. The series hybrid filter consists of a small rated series active power filter (SAPF) and a shunt passive filter with variable inductance using a thyristor control reactor (TCR). The DC voltage available at the load side of a typical voltage harmonics source, such as a diode bridge rectifier followed by a capacitor, is utilized as a source of DC power for the SAPF. To increase the filtering performance of the shunt passive filter, SAPF is control in such a way that it increases the network impedance at the harmonic frequency. This also helps to avoid any series or parallel resonance that may occur. The shunt passive filter together with a TCR is used to support the variable load reactive power demand as well to tackle the current harmonics generated by non-linear load. The performance of proposed series hybrid power filter is validated through MATLAB/Simulink simulation study and successfully utilized to compensate the voltage sag, voltage swell, voltage harmonics, current harmonics and load reactive power demand.