Mitigation of subsynchronous resonance by static compensator with the aid of fuzzy logic controller and adaptive neuro fuzzy inference system controller

Series compensation in long transmission lines is a drastic solution to enhance power transfer capacity of Power System networks. However, usage of series capacitors may cause subsynchronous resonance (SSR) between electrical and mechanical systems. This phenomenon may damage Turbine generator shaft. Static compensator (STATCOM) is one of the important Flexible ac transmission systems (FACTS) devices which uses to control power factor, to regulate voltage, to stabilize power flow and to improve the dynamic performance of power systems, moreover, it is able to provide efficient solution to damp the SSR, but it is essential to add an auxiliary controller to the STATCOM for the purpose of mitigating the SSR. In this paper, two controllers are added to STATCOM: Fuzzy Logic Controller (FLC) and Adaptive Neuro Fuzzy Inference System (ANFIS) and results are compared. This study has conducted on the system adapted from the IEEE Second Benchmark Model. Results have been taken with the help of MATLAB simulation.