Load frequency control using multi-stage fuzzy logic controller for wind-micro hydro-diesel hybrid power system

Abstract

This paper presents an analysis of multi-stage fuzzy logic control (FLC) application for load frequency control (LFC) of an isolated wind-micro hydro-diesel hybrid power system. Due to the sudden load changes and intermittent wind power, large frequency fluctuation problems can occur. The LFC deviates the frequency deviation and maintains dynamic performance of the system. In this paper, a multi-stage fuzzy logic proportional integral derivative (PID) controller is proposed for LFC of an isolated wind-micro hydro-diesel hybrid power system. Simulations are performed for this hybrid system with the proposed multi-stage fuzzy logic PID controller, conventional PI controller and FLC with different load disturbances and wind input disturbances. The performance of the proposed approach is verified from simulations and comparisons. Simulation results explicitly show that the performance of the proposed multi-stage fuzzy logic PID controller is superior to the conventional PI controller and FLC in terms of overshoot, settling time and steady state error against various load changes and variations of wind inputs.