Double-source alternate backup type unified power quality conditioner

Abstract

A double-source alternate backup type unified power quality conditioner (DS-UPQC) is proposed inthis paper, which consists of two shunt inverters and two series inverters, the shunt inverters areconnected alternately to the series inverters through the dc links, and a simple effective controlscheme is also proposed. DS-UPQC can compensate harmonic voltage, voltage sag and swell, voltageinterruption, three-phase voltage unbalance, harmonic current and reactive power current. Theproposed system can realize the desired power alternate backup among different sources, and provideuninterrupted power supply $Box$ thereby improve power system reliability effectively. Simulation resultsbased on MATLAB/SIMULINK are presented to verify the good performance