Design of Upqc to Mitigate Power Quality Issues

Abstract

In this paper the power quality improvement is done by mitigating harmonics using the custom power devices like Unified Power Quality Control (UPQC). The UPQC consists of combination of series and shunt active filters. Series filter inject voltage which gets added at the point of common coupling and hence the voltage at the load end gets unchanged with the voltage disturbances. Shunt active filter compensates the load reactive power demand and hence mitigates the harmonics from supply current and also maintains the DC link voltage. Unified power quality conditioner (UPQC) is one modern device which deals with voltage and current imperfections simultaneously. In this paper, an attempt has been made to model the UPQC for voltage and current compensation with the help of two different control schemes. The current and voltage harmonics as well as voltage sag and swells compensation are analyzed MATLAB/SIMULINK software.