STATCOM with fuzzy controllers for interconnected power systems

In this paper, the fuzzy controller is designed for static synchronous compensator (STATCOM) to enhance interconnected power system stability. The power frequency model for STATCOM with conventional controllers is presented first. Fuzzy controllers are then designed for both main and supplementary controllers of the STATCOM. The fuzzy main control is constant voltage control with voltage regulation which aims at providing voltage support on the tie lines of interconnected power systems to enhance transient stability and increase transfer limit. The fuzzy supplementary control (SC) is designed for damping interarea power oscillation and enhancing dynamic stability of interconnected power systems. The integrated STATCOM model has been incorporated to the small signal stability and transient stability programs with a novel interface. Computer tests are conducted on a four-generator test system. The results show that STATCOM can enhance system transfer limit and improve system dynamic behavior significantly. Computer results also show that the performance of fuzzy controllers is fairly well and possesses good robustness. (C) 2000 Elsevier Science S.A. All rights reserved.