Fractional order fuzzy PID controller for wind energy‐based hybrid power system using quasi‐oppositional harmony search algorithm

Abstract

In this study, a novel fuzzy logic control scheme is investigated for the frequency and power control of an isolated hybrid power system (HPS) (IHPS) and HPS‐based two‐area power system. The studied IHPS comprises of various autonomous generation systems such as wind energy, diesel engine generator and an energy storage device (i.e. capacitor energy storage device). A novel fractional order (FO) fuzzy proportional‐integral‐derivative (PID) (FO‐F‐PID) controller scheme is deployed and the various tunable parameters of the studied model are tuned by quasi‐oppositional harmony search (HS) (QOHS) algorithm for improved performance. The QOHS algorithm (based on standard HS algorithm) accelerates the convergence speed by combining the concept of quasi‐opposition in the basic HS framework. This FO‐F‐PID controller shows better performance over the integer order‐PID and F‐PID controller in both linear and non‐linear operating regimes. The proposed FO‐F‐PID controller also shows stronger robustness properties against loading mismatch and different rate constraint non‐linarites than other controller structures.