Coordinated Design of Type-2 Fuzzy Lead–Lag-Structured SSSCs and PSSs for Power System Stability Improvement

This work suggests a type-2 fuzzy lead–lag (T2FLL) controller structure for flexible AC transmission system (FACTS)-based damping controllers and power stabilizers (PSSs) stability improvement. The values of the suggested are optimized by hybrid adaptive differential evolution pattern search algorithm (hADE-PS) method. Initially, single-machine infinite-bus (SMIB) with (LL)-structured FACTS PSS is considered, dominance hADE-PS method established over original (DE), genetic (GA), particle swarm optimization (PSO). supremacy T2FLL (LL) under different large small disturbance conditions, as well varied loading conditions fault positions. Lastly, effectiveness evaluated in multimachine (MMPS). It demonstrated that offers better performance than LL various providing significantly more to all modes oscillations.