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The FACTS devices, such as, thyristor controlled series compensators (TCSC) may be used to enhance system performance by controlling the power flows in the network. TCSC can be used to effectively control the load flow distribution and the power transfer capability, to reduce the active power losses and decrease the cost of power production. It is important to locate these devices optimally in the power system because of their considerable costs. Firstly, we perform a sensitivity analysis and ranking process to determine the optimal placement of TCSC. Thus, a method has been suggested in this paper based on real power flow performance index sensitivity and reduction of total system reactive power losses. Secondly, we have applied optimization techniques to find the best optimal location in order to reduce generation rescheduling cost. Evolutionary algorithms have been used to solve this nonlinear optimization problem, such as, the second version of non-dominated sorting genetic algorithm (NSGAII). [ABSTRACT FROM PUBLISHER]

The rate of dissipation of transient energy is usually used as a tool to measure dynamic system damping. This paper applies and discusses the above control strategy for suppressing undesirable electromechanical oscillations in power system with a STATic synchronous COMpensator (STATCOM), static synchronous series compensator (SSSC) and unified power flow controller (UPFC). A single machine infinite bus power system was studied over a several disturbance. The obtained results show the effectiveness and robustness of these devices on power system stability. [ABSTRACT FROM PUBLISHER]