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From depletion of energy resources and consideration to natural environment, dispersed power system such as wind power generators are introduced. Moreover, all electrification in houses or residences and electric vehicles are increased in recent years. Again, introduction of photovoltaics has increased in demand side. However, due to the fluctuating power from renewable energy sources and loads, frequency and voltage fluctuation of power system become problematic. This paper presents a methodology for grid frequency and voltage control by distributed controllable loads. This system consists of diesel generators, wind generators, photovoltaics and loads. By applying power consumption controller adopted PI control, grid frequency and voltage fluctuations are maintained around rated value. In order to verify the effectiveness of the proposed system, MATLAB/Simulink is used for simulations.