Robust Wide-Area TS Fuzzy Output Feedback Controller for Enhancement of Stability in Multimachine Power System

Abstract

This paper presents a systematic procedure for designing a wide-area centralized Takagi-Sugeno fuzzy controller to improve the angular stability of a multimachine power system. The proposed fuzzy controller is robust and designed by satisfying certain linear matrix inequality conditions, to stabilize the system at multiple operating points. The bilinear matrix inequality problem, encountered in Lyapunov-based stability criterion, has been converted into a convex optimization problem to eliminate iterative solution. The input-output control signals are selected in the proposed control scheme by defining joint model controllability and observability index applying geometric approach. The proposed wide-area control scheme employs a global signal from the centralized controller to damp out the interarea mode of oscillations, apart from the local controllers, which are assumed to be present to damp out the local mode of oscillations. The proposed control scheme has been implemented on three test systems. The effectiveness of the proposed control scheme has been compared with a robust wide area control scheme based on mixed H 2 /H ∞ output feedback synthesis and with a conventional power system stabilizer control scheme.Index Terms-Interarea modes of oscillation, linear matrix inequality, power system stabilizer, TS fuzzy controller.

Simultaneous Robust Coordinated Damping Control of Power System Stabilizers (PSSs), Static Var Compensator (SVC) and Doubly-Fed Induction Generator Power Oscillation Dampers (DFIG PODs) in Multimachine Power Systems

“…A plenty of research has demonstrated the theoretical validity and practical availability of geometric and residue approaches to choose the most suitable wide-area feedback signal for POD [36][37][38]. In this study, the concept of joint modal controllability/observability index is adopted as wide-area feedback signals selection method to decouple modal interactions of multiple feedback signals [32].…”

“…A classical lead-lag type POD is adopted in this coordinated design strategy. The joint modal controllability/observability index is employed to choose the most appropriate wide-area feedback signals for PODs [32]. The coordinated design strategy is addressed as an eigenvalue-based optimization problem [33].…”

Wide-Area Based on Coordinated Tuning of Fuzzy PSS and Facts Controller in Multi-Machine Environment

“…The classic PSS is connected to G 2 and G 3 based on and intelligent method presented in [28] to damp out local modes of oscillations. Then, the additional global signal is assumed to be provided to the stabilizer of the selected generator from a centralized wide In this test the critical mode is categorized in to two mode as; Mode one: −0.0046± 3.4279i eigen-value, 0.25% damping by 0.5456 (Hz) frequency, Mode one: −0.5297± 6.8076i eigen-value, 7.76% damping by 1.0835 (Hz) frequency [8].…”

“…To demonstrate the effectiveness of the proposed strategy, this method has been tested over three case studies through the comparison of without wide area controller and [8]. The simulation results have been tested in different load con-dition and faults where two scenarios have been considered to find the capability of the proposed wide area control strategy.…”

“…Actually, there are two types of methods to overcome the difficulty of classic T-S controller. One method is to exploit a good tradeoff be-tween the conservatism and the computational burden by reducing unimportant decision variables [8]. However, the obtained controllers are still with a number of control rules, which may be unfavorable for implementation.…”