An online auxiliary control was designed for Static Var Compensator (SVC) to improve the poorly damped oscillations in power system subjected to large disturbances. This paper presents auxiliary control based on Adaptive Neuro-Fuzzy Inference (ANFIS) control using triangular membership function. | Journal of Science & Technology 131 (2018) 042-048 Online Adaptive Neuro-Fuzzy Inference Based SVC Control Strategy for Stability Enhancement in Two-Machine Power System Nguyen Thi Mi Sa* Hochiminh City University of Technology and Education No 1 Vo Van Ngan Str., Linh Chieu Ward, Thu Duc District, Ho Chi Minh City Received: August 31, 2018; Accepted: November 26, 2018 Abstract An online auxiliary control was designed for Static Var Compensator (SVC) to improve the poorly damped oscillations in power system subjected to large disturbances. This paper presents auxiliary control based on Adaptive Neuro-Fuzzy Inference (ANFIS) control using triangular membership function. Such a model free based control does not require any prior information about the system and is robust to system changes quickly. The time domain simulation results were carried out for two machine test system for two different cases. In order to exploit the performance and robustness of ANFIS control, the results were compared with conventional PI. Controler simulation results and performance indices reveal that the proposed control outperforms during various fault conditions and hence improves the transient stability to a great extend. Keywords: Static Var Compensator, Muti-Machine Power System, Adaptive Neuro-Fuzzy Inference, Stability 1. Introduction* point. The developments in the field of power electronics technologies have resulted in the use of Flexible AC Transmission System (FACTS) controllers in power system. With the introduction of FACTS controllers, transmission lines can be loaded up to its thermal limits and therefore avoid installation of new transmission lines. FACTS controllers with an appropriate external control design have a great potential to efficiently improve the poorly damped oscillations [6-8]. The main FACTS controllers are: Static Var Compensator (SVC), Static synchronous Compensator (STATCOM), Thyristor Controlled Series Capacitor (TCSC), Phase Shifting Transformer .
