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考虑阴影影响的光伏阵列仿真算法研究

, PP. 131-138

Keywords: 光伏阵列,阴影影响,I-U特性,分布式计算,仿真算法

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Abstract:

针对光伏发电输出功率的波动性和随机性,为了改善光伏发电功率的可预测性和最大功率跟踪的准确性,必须深入研究阴影对光伏阵列输出特性的影响。首先以光伏组件为基本单元,兼顾旁路二极管和防逆二极管的影响,建立光伏阵列的高维数学模型,提出了易于分布式实现的、适用于任意阴影条件的光伏阵列输出特性快速计算机仿真算法。不同阴影条件下的仿真结果表明,光伏阵列的输出特性与阴影的分布范围及其光照强度密切相关,阴影使光伏阵列输出特性发生显著变化;仿真计算时间与光伏阵列的规模呈近似线性关系,采用分布式计算或减少离散点数都可以显著提高计算速度。本算法物理意义清晰、易于实现,为实际光伏阵列的分析与控制奠定了基础。

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