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电网技术  2011 

光照强度快速变化时光伏系统稳定性分析

, PP. 60-65

Keywords: 光强变化,光伏阵列,最大功率跟踪,稳定性

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Abstract:

由于太阳能电池输出功率受光照条件影响,在多云和刮风等使光照强度瞬时有较大变化的天气环境下,光伏阵列的最大功率点会相应移动,常规最大功率跟踪算法不能分辨光伏阵列输出功率的变化是来自自身扰动还是外界光强变化的影响,因此普通最大功率跟踪算法会暂时失效。研究了快速光照强度变化时光伏阵列特性数学模型及常规最大功率跟踪方法失稳的原因,研究了在2个采样点插入1次测量来抑制光强变化对光伏系统影响的最大功率跟踪方法。理论分析及仿真结果表明,采用抑制光强影响的最大功率跟踪方法可以有效避免控制器误判,准确分辨光伏阵列由最大功率跟踪扰动产生的功率增量,从而避免光强变化时系统工作点偏离最大功率点,提高系统的稳定性和可靠性。

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