光伏阵列在阴影下最大功率点跟踪策略研究  

Research on Maximum Power Point Tracking Strategy for PV Array under Shaded Conditions

作　　者：王庆磊[1] 徐红城 张强[1] 张海霞[1] 

机构地区：[1]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《电器与能效管理技术》2017年第24期42-48,共7页Electrical & Energy Management Technology

基　　金：安徽理工大学硕博基金资助项目(2017yb22)

摘　　要：在局部阴影条件下,光伏电池阵列输出的功率-电压(P-U)特性曲线有多个局部峰值点(LMPP)。传统的最大功率追踪(MPPT)方法可能不能追踪到最大功率点(GMPP),导致光伏电池阵列输出效率降低,造成能量损失。应用MATLAB/Simulink对局部阴影下的光伏电池模型进行仿真,得出其P-U特性曲线上相邻两个峰值点的电压差具有等差性,即电压差等于(0.7~0.9)U_(oc)(U_(oc)为单个光伏电池的开路电压)的整数倍。基于这个特性和修正变步长电导增量法相结合,提出了一种新的最大功率点跟踪策略,并能够快速、准确地跟踪到最大功率点。经过MATLAB/Simulink对光伏电池阵列仿真验证了跟踪策略的正确性和可行性。Photovohaic cell array＇ s outpur power-vohage （P-U）characteristic curve has multiple local peaks （LMPP） under the condition of partial shadow yet the traditional method of maximum power point tracking （MPPT） may not be able to track the maximum power point （GMPP） , which results in the low efficiency of photovoltaic cell model under the condition of partial shadow. It is concluded that the voltage difference of adjacent two peaks in the P-U characteristic has equidifference, that is, the voltage difference approximately equals the integral multiple of 0.7 - 0.9 Uoc （the open voltage）. Based on the features and modified variable step incremental conductance, this paper proposed a new maximum power point tracking strategy,which can rapidly and accurately track the maximum power point. The sinmlation verifies the correctness and feasibility of the tracking strategy.

关 键 词：局部阴影 光伏阵列 P—U特性曲线 最大功率点追踪 

分 类 号：TM615[电气工程—电力系统及自动化]