Abstract
The Flexible AC transmission System (FACTS) devices, such as, thyristor controlled series compensators (TCSC) may be used to enhance system performance by controlling the power flows in the network. It is important to limit the number of TCSCs and to locate optimally these devices in the power system because of their considerable costs. Firstly, we have applied optimization technique, namely, NSGA-II, to find out the optimal number of multi-devices of TCSC in order to improve the system loadabilty, to reduce the installation cost of these series FACTS and to minimize the real power losses. Secondly, we perform a contingency analysis procedure based on severity index (SIl) to identify and classify the most severe line contingencies. Then, we determine the optimal placement and parameter setting of TCSCs in stressed power system by using the above optimization approach to alleviate the line overloads. In this paper, the optimization problem consists to reduce TCSCs installation cost and to decrease total real power losses. To demonstrate the effectiveness of the proposed approach, IEEE 30-bus test system has been studied.