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一种VWP分段模糊控制的光伏系统MPPT方法

DOI: 10.3969/j.issn.1005-3026.2015.08.001, PP. 1065-1069

Keywords: 光伏系统,模糊控制,最大功率跟踪,可变天气参数,分段控制

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Abstract:

当天气情况快速变化时,如何同时优化光伏(photovoltaic,PV)系统在最大功率跟踪(maximumpowerpointtracking,MPPT)控制中的快速性、准确性和平稳性目前仍是一个难题.针对这一问题,提出了一种可变天气参数(variableweatherparameter,VWP)分段模糊MPPT方法.该方法采用两条VWP直线将输出功率曲线分为三个跟踪区域,每个区域采用一个模糊控制器进行控制,其总体控制决策为:在控制量远离理想最大功率点(maximumpowerpoint,MPP)时采用大步长以确保跟踪的快速性,在控制量接近MPP时采用小步长以确保跟踪的准确性和平稳性.仿真实验证明,该控制方法比传统扰动观察法具有更好的快速性、准确性和平稳性.

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