复杂光照条件下串联光伏阵列特性研究及最大功率跟踪

STUDY ON CHARACTERISTICS OF SERIES PHOTOVOLTAIC ARRAY AND MAXIMUM POWER TRACKING UNDER COMPLEX ILLUMINATION

分析复杂光照条件下旁路二极管的接入对串联光伏阵列输出特性的影响,根据单个光伏模块的数学模型,导出复杂光照条件下串联光伏阵列的数学模型;通过对各种光照条件下串联光伏阵列输出特性的分析研究,总结U-I曲线中呈现恒流源特性的电压区间与不同光照之间存在的关系,提出一种在复杂光照条件下快速追踪串联光伏阵列最大功率点(maximum power point,MPP)的算法,算法能够在复杂光照导致的多个MPP中确定全局最大功率点(global maximum power point,GMPP)。仿真表明,提出的算法能够识别阵列是否处于复杂光照情况下并快速追踪到GMPP。

The impact of the output characteristics of series PV array, which accesses to the bypass diodes on condition of complex illumination was analyzed. Based on the mathematical model of single PV modules, mathematical model of the series PV array was derived. According to the analysis of output characteristics of series array under changing illumination and the summary of the relationship between the voltage range of U-I curve the constant current source and changing illumination, a new algorithm for fast tracking series photovoltaic array MPP under complex illumination is proposed. The algorithm can be used to determine the global maximum power point （GMPP）in multiple MPPs under complex illumination. The simulation results showed that the algorithm can identify whether the array is under complex illumination and fast tracking to GMPP.