DESIGN AND IMPLEMENTATION OF UNIFIED POWER QUALITY CONTROLLER

Power line disturbances such as voltage dips and fluctuations, momentary interruptions, harmonics and transients incur a heavy loss to electric utility customer. Except the power outages and transients due to lightning , other power quality problems like sags, swells, short term interruption, harmonics , distortions occur either due to some faults in distribution feeders or interference from loads. During short circuits or fault clearing process in feeder, the neighboring feeders can get affected with sags or swells in the supply voltage. In this paper authors have proposed new Unified Power Quality controller (UPQC) that protects the load from these power quality issues as well as regulates the terminal voltage of the load. Authors have also explained the system configuration, control strategy and practical implementation of the UPQC