This paper proposes three nonlinear controllers such <br />as fuzzy logic controller (FLC), static nonlinear controller (SNC), <br />and adaptive-network-based fuzzy inference system (ANFIS)- <br />based variable resistive-type fault current limiter (VR-FCL) to <br />augment the transient stability of a large-scale hybrid power system <br />consisting of a doubly fed induction generator (DFIG)-based <br />wind farm, a photovoltaic (PV) plant, and a synchronous generator <br />(SG). Appropriate resistance generation of the VR-FCL during <br />a grid fault to provide better transient stability is the main contribution <br />of the work. The effectiveness of the proposed control <br />methods in improving the transient stability of the hybrid power <br />network is verified by applying both balanced and unbalanced <br />faults in one of the double circuit transmission lines connected to <br />the system. Simulation results show that the proposed FLC-, SNC-, <br />or ANFIS-based VR-FCL are effective in improving the transient <br />stability of the studied hybrid system. Moreover, all the proposed <br />methods exhibit almost similar performance. Therefore, any of the <br />methods can be chosen for the transient stability enhancement of <br />the hybrid power system.
