Power conditioning of Distributed Generation system using Unified Power Quality Conditioner

Abstract

Distributed Generation (DG) system is a futuristic step towards generation of electrical power energy. It is treated as a microgrid, which is integrated with renewable energy resources. The successful implementation of DG in ac distribution system depends on the Power Quality (PQ) of generation. The power conditioning or the power quality of the microgrid is accomplished by Unified Power Quality Conditioner (UPQC). The series Voltage Source Converter (VSC) of UPQC can eliminate harmonics of the voltage and can compensate the load reactive power of the DG system. Correspondingly, the shunt VSC of UPQC can eliminate current harmonics and can compensate the load reactive power under nonlinear load conditions. In this work, the Power Angle Controller (PAC) has been used for voltage related problems whereas the Instantaneous Symmetrical Voltage Component Theory (ISVCT) based controller has been used to compensate for the current related problems. Since PAC is incapable of reducing the voltage harmonics, the d-q transformation based controller has been used to extract the voltage harmonics and has been integrated with the PAC. The results have been verified for the effectiveness of the controllers.