Fuzzy Logic Based Load Frequency Control of a Single Area Power System

This paper has presented the design and comparative evaluation of PI, PID, fuzzy logic, and fuzzy tuned PI controllers for the load frequency control of a single area power system. The gains of the conventional PI and PID controllers were obtained using the Cohen–Coon reaction curve tuning method, while the fuzzy logic and fuzzy tuned PI controllers were designed using a two-input, one-output for fuzzy logic case and two-output for the FTPI case. fuzzy inference system based on the frequency error and its rate of change. Simulation results for a step change in load demand show that, while the conventional PI controller is effective at removing steady-state frequency error, the fuzzy-based controllers and in particular the fuzzy tuned PI controller offer a noticeably faster transient response for the single area system. Future work may extend this single area study to a two-area or multi-area interconnected system, and may also explore metaheuristic optimisation of the fuzzy rule base and membership functions to further improve the dynamic performance of the controller.

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