The wind energy has several merits but there exit some barriers in the development of wind power plant, and this is as a result of the highly erratic characteristic for the wind power. It can be solved by using the micro-grid system. The most significant factor in this system is to install an energy storage system to the wind power plant and different types of storage can be used according to different situations. The energy storage system can be used to smooth the fluctuation and can supply the electricity when the wind is not sufficient. In this thesis, lead-acid battery is used to combine with lithium battery in the wind power farm which supports electricity demand in Changshan archipelago in China. By operating the micro-grid system, the security of the electricity supply on that archipelago can be ensured. Approaches to optimize the micro-grid system is analyzed in this thesis in order know how does the system operated under different model, especially in the isolated operating model.