STATE FEEDBACK CONTROLLER DESIGN FOR A SSSC USING IC-HS ALGORITHM

This paper presents a novel method for damping of low frequency oscillations (LFO) based on design of a state feedback controller for synchronous series compensator (SSSC) in a power system. The design problem of state feedback damping controller is formulated as an optimization problem to minimize a time domain based objective function by improved chaotic–harmony search (IC-HS) technique. Some modifications in harmony search algorithm are made for improvement of algorithm convergence. In fact, this paper focuses on coordinating of SSSC‘s inputs with together and coordination of power system stabilizer (PSS) with SSSC‘s inputs to find the best dynamic response. Single Machine Infinite Bus (SMIB) system has been considered to examine the operation of proposed controllers. Change of the input power of generator abruptly, is considered as a disturbance. The effectiveness of the proposed state feedback controller has been demonstrated by nonlinear time domain simulation studies. The results analysis show that the proposed controller can provide the excellent capability in fast damping of power system oscillations and improve greatly the dynamic stability of power system. In addition, the system performance analysis and surveys under various operating conditions demonstrate that the simultaneously coordination of SSSC‘s input controllers are superior to the PSS based damping controller.