An Optimum Wind Solar Hybrid System for Stand –Alone Power Generation

Abstract

The dynamic behaviour and simulation results of a stand-alone hybrid power generation system comprising of a wind turbine, solar array and battery storage are presented in this Paper. The objective of this study is to review the state of the simulation, optimization and control technologies of the stand-alone hybrid solar-wind energy system with the inclusion of battery storage. The hybrid system used for the simulation consisted of a 100W wind turbine, 150W solar array and a 70Ah lead acid battery. A Fuzzy Logic Maximum Power Point Tracker (MPPT) controller was applied to the variable-speed, fixed-pitch small scale wind turbine while maximum power point tracking (MPPT) method based on Perturb & Observation (P&O) searching algorithm was applied to the stand-alone solar photovoltaic system. MATLAB Simulink TM 7.2 / Simpower system software environment was utilized to accomplish and simulate individual wind and PV dynamic models of the hybrid system. The public domain software, Hybrid Optimization Model for Electric Renewables (HOMER) produced by the National Renewable Energy Laboratory was used to optimize the hybrid system with data taken from a feasibility study together with meteorological data obtained from a selected area in Sri Lanka.