Investigation on Mitigation of Power Quality Problems in Utility and Customer side Using Unified Power Quality Conditioner

The curent harmonics, voltage unbalance, sag and swell conditions are the serious power quality problems(PQ) arising in a power distribution system. The impact of unified power quality conditioner for mitigation of power quality problems in utility and customer side is investigated in the paper. The topology of UPQC is configured from the two voltage source inverters connected back to back with a common DC link acting as a series and shunt active power filter. The DC link voltage is greatly perturbation by voltage unbalance in utility side and sudden load change in customer side. The hysteresis voltage and current controller of UPQC strategy are implemented with the aim to have the robust control on compensation voltage and compensation current generated by the series and shunt active filter respectively. An elaborative proposed strategy applied to practical issues is investigated in Matlab/Simulink simulation tool.