Congestion Management in Transmission System using PST

In a deregulated environment, congestion management is a technical challenge where congestion is primarily due to overloading of transmission lines, sometimes resulting into equipment's failure, undesirable outages and blackouts. Unbundling of power sector has caused the burden of it on System Operator (SO) due to non-synchronized operation of generation companies and consumers. Thyristor-Controlled Phase Shifting Transformer (TCPST) is one of the simplest and cheapest options for the power flow control and has been used for the same on power grid traditionally. Considering the perspective of SO to manage congestion in transmission lines, this paper presents a TCPST integrated DCOPF scheduling algorithm for SO. To show the applicability of the algorithm with and without line contingency, an IEEE 24-Bus system is used as case study. GAMS solver is used and results analyze the performance of the TCPST in congestion mitigation, system operating cost and congestion cost. A sensitivity analysis pertaining to the effect of TCPST location on congestion has also been conducted which finally identifies the best location and minimum numbers of TCPSTs for desired results.