Abstract:
Wind has been widely used to generate electricity in recent years. However, it has some disadvantages, e.g. the generated power, comprising voltage magnitude and frequency are intermittent due to the variation of wind speed. Injection of such power into the utility grid affects the quality of electricity and system stability, in particular. Installing appropriate size of battery to the generation system could mitigate these difficulties. An optimal battery capacity could enable the total generation to meet the load demand, decrease fluctuation, and can limit total investment costs. The purpose of this thesis is to determine the appropriate capacity of battery for the fluctuated output power elimination. Firstly, wind speed is simulated by a mathematical model considering uncertainty of the wind speed. Then the power output, voltage, and frequency can be computed based on Doubly-Fed Induction Generator. To determine an optimal battery capacity, the mathematical model of lead-acid battery is applied altogether with a numerical method. The battery’s capacity will be chosen from actual manufacturer’s data. This proposed algorithm has tested, and satisfactory results have been obtained.