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PV array by the partial shadowing its}-v characteristics are presented multimodal features, there are a number of local peaks. In order to avoid the maximum power point tracking algorithm in this case is difficult to find the global BU maximum power point, the article presents an optimized maximum power point tracking algorithm, which applies to the situation of local and global shadow occur in partial shade situation Bu, compared by MATLAB simulation and prototype testing with the traditional maximum power point tracking algorithm, the optimization algorithm can determine whether shadowing occurs in the case of local and global uniform shadow BU are able to track the maximum power point of the global PV array power to avoid rabbit improve the efficiency of photovoltaic systems lo