部分遮挡条件下光伏阵列全局最大功率点追踪控制

发布时间：2018-10-21 18:41

【摘要】：光伏阵列的部分遮挡,使阵列功率电压特性呈现多峰,现有最大功率追踪方法在速度、准确度和可操作性方面仍有较大改进空间。首先,利用恒流源特性提出全局最大功率追踪新方法,即调整电流线法,该方法在P-U特性上沿着电流线斜率单调变化的方向不断调整电流线;然后对所提方法利用恒流源特性加快电流搜索过程并提高搜索终止条件的准确性;再从搜索过程和搜索终止条件两方面对现有0.8倍开路电压法进行改进;最后,以某光伏阵列3种遮挡模式以及遮挡模式间的变化为例,通过仿真验证所提两种方法(调整电流线法和改进的0.8倍开路电压法)均能准确、快速地追踪到全局最大功率点。所提方法为多峰最大功率追踪提供了新的思路。
[Abstract]:The partial occlusion of the photovoltaic array makes the power and voltage characteristics of the array multi-peak. There is still much room for improvement in speed accuracy and maneuverability of the existing maximum power tracking methods. Firstly, a new method of global maximum power tracing is proposed by using constant current source characteristics, namely, the method of adjusting current line, which adjusts the current line in the direction of monotonic change of current line slope in P-U characteristic. Then the proposed method uses the characteristics of constant current source to speed up the current search process and improve the accuracy of the search termination condition. Then the existing 0.8 times open circuit voltage method is improved from the two aspects of the search process and the search termination condition. Finally, Taking the variation of three occlusion modes and occlusion modes of a photovoltaic array as an example, the simulation results show that the proposed two methods (adjusting current line method and improved 0.8 times open circuit voltage method) are accurate and can quickly track the global maximum power point. The proposed method provides a new idea for multi-peak maximum power tracking.
【作者单位】：天津大学智能电网教育部重点实验室;
【基金】：天津市科技计划项目(13TXSYJC40400)
【分类号】：TM615

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