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This paper emphasis on Load frequency control of a micro-grid using fractional order proportional integral derivative (FOPID) controller based. The microgrid consist of wind energy, solar energy, ultra-capacitor, and diesel generator. The main objective is to design a robust controller that can ensure good frequency control of the micro-grid by reducing the fluctuations of the system frequency during addition or withdrawal of load, perturbation, or change in weather due to renewable energy sources. The mathematical model of the micro-grid is developed and simulated using MATLAB/SIMULINK. The results of frequency deviation obtained by robust FOPID and PID controller are compared for model validation and represented in per unit as well as the deviation response. The former depicts a better load frequency control with reduced overshoot and low settling time.