An integrated approach with redispatch and UPFC for voltage stability enhancement in deregulated power systems

In this paper, an effort has been made to enhance static voltage stability using Unified Power Flow Controller (UPFC) and redispatch as an integrated approach. The redispatch using Interior Point — Optimal Power Flow (IP-OPF) can ensure all operating constraints of system within satisfactory range. Using this operating state, the Continuous Power Flow (CPF) is used to compute Critical Loading Margin (CLM) as a measure for voltage instability margin. The case studies are repeated by using Decoupled Power Injection Modeling (DPIM) of UPFC on IEEE 14-bus test system. The outcome is validating the proposed approach to enhance voltage stability margin significantly even under (N-1) line contingency.