Design and Analysis of UPQC Based Fault Mitigation for Power Quality Enhancement in Distribution System

Power quality problems have become more complex at all level of power system. By using power electronic devices can be effective improve the quality of power supplied to the distributed system. The topology of UPQC to have a reduced dc-link voltage without compromising its compensation capability. This proposed topology also helps to match the dclink voltage requirement of the shunt and series active filters of the UPQC. The equipment corresponds to the back-to-back connection of a series and a shunt active filter connected to DC link which is able to reduce the voltage interruption, voltage sag, harmonics and reactive power control. The average switching frequency of the switches in the VSI also reduces; consequently the switching losses in the inverters reduce. A simulation study of the proposed topology has been study by using MATLAB/SIMULINK.