一种光伏系统的多峰值最大功率点跟踪策略

A Novel Global Maximum Power Point Tracking Strategy for Photovoltaic System

局部阴影条件下,光伏阵列的输出功率-电压(P-U)特性曲线存在多个局部峰值(LMPP)。传统的最大功率点跟踪(MPPT)法可能使系统工作于LMPP,错失真正的全局最大功率点(GMPP)。通过分析局部阴影条件下光伏阵列的输出电流-电压(I-U)特性曲线,提出了将电流控制和扰动观察法(P&O)结合的MPPT策略,实现了跟踪GMPP的目标。仿真结果表明该算法比扫描整条P-U曲线法节省了50%的时间,实验验证了其易用性。

As the power-voltage （P-U） characteristic of photovoltaic arrays operating under partial shading condition exhibits multiple local maximum power points（LMPP）,conventional maximum power point tracking（MPPT） methods can easily be trapped at local maxima.By analyzing the current-voltage（I-U） curve of photovoltaic arrays which are partial shaded,a new strategy to search the global maximum power point（GMPP） is proposed.The current control method as well as perturb and observe（P＆O） method are combined together to fulfill the goal.Simulations and exper- iments are presented to assess the performance of the proposed method.