A comparative study on UPFC and SVC towards voltage profile improvement of a grid connected distributed generation system

Distributed Generation (DG) is confined by limited size (roughly 10 MW or less) and interconnected at distribution feeder, substation, or customer load levels. In order to meet the rising electrical power demand, reliability, service quality and pollution reduction, the existing power grid infrastructure should be developed into a Smart Grid that has the flexibility to allow interconnection with the distributed generation. Although the expansion of DG has positive impacts on voltage profile in Grid system, the introduction of DG affiliated with distribution network makes the voltage profile of buses in a fluctuating state and hence makes the system unstable. An attempt has been made to demonstrate the FACTS device to make the grid connected system stable and more reliable. In general FACTS devices are voltage-source converters which act as either a source or sink of reactive AC power to an electricity network. The paper presents a comparative study of voltage profile improvement of a grid connected distributed generation (DG) with the help of UPFC and SVC. Simulation results are provided to confirm the above said statements.