Optimal power flow-based congestion management in restructured power systems

Abstract

This paper deals with an important issue of transmission network congestion in deregulated power systems, where relieving transmission network congestion without disturbing the existing transactions. The thyristor controlled series capacitor (TCSC) is one of the alternatives to reduce the flow in heavily loaded lines, result in an increased loadability and fulfilled contractual requirement by controlling the power flow in the network. The distribution generation (DG) units are another alternative to compensate deficit power at load bus so that reduce power flow heavily loaded lines. Considerable cost of TCSC and maximum benefits with DG unit at load buses, it is necessary to find their optimal location in the system, a method to determine the optimal placement of these devices has been suggested real power flow and transmission line relief sensitivity index methods. The OPF-based congestion management (CM) strategy has been implemented to minimise production cost and alleviates transmission network congestion with TCSC/DG unit. The OPF-based CM problem is implemented on 26 bus power system network and solutions are obtained by three conventional methods. The experimental results prove that the interior point (IP) method is gives an optimum economical solution.