Optimal placement of UPFC across a transmission line considering techno-economic aspects with physical limitation

Abstract

Changing load in power system network might lead to the voltage collapse in critical situations. By providing the proper power compensation with respect to these changes, the stability of such system can be increased. This paper aims at optimal placement of a unified power flow controller (UPFC) across a transmission line to overcome such stability problems by injecting active and reactive power into the system. For the analysis we have chosen standard IEEE test systems of 14-bus, 30-bus and 57-bus network. The PQ buses are loaded randomly to simulate the unpredictability and challenges of a power system transmission network. By using Mi-Power 9.0 software newton raphson load flow (NRLF) is applied to get power flow solution with and without UPFC. UPFC is placed at receiving-end bus, mid-point or sending-end bus of the transmission line connecting the lowest voltage magnitude bus and any adjacent bus. The analysis is done based on voltage profile improvement index (VPII), active and reactive power losses, UPFC installation cost and power generation cost. The effectiveness and benefits of UPFC allocation is proved by results.