光伏系统在局部阴影条件下避免困于局部最大功率点跟踪算法研究  

Research on an optimized maximum power point tracking algorithm avoiding local under partially shaded conditions in photovoltaic system

作　　者：陈侃[1] 冯琳[1] 贾林壮[1] 李国杰[1] 

机构地区：[1]上海交通大学电力传输与功率变换控制教育部重点实验室,电气工程系,上海200240

出　　处：《可再生能源》2013年第1期13-16,共4页Renewable Energy Resources

基　　金：“863”计划资助项目(2012AA050204);上海市科委资助项目(11dz1210402);国家自然科学基金资助项目(50977050)

摘　　要：光伏阵列受到局部阴影遮蔽时其P-V特性会呈现多峰特性,出现多个局部峰值。为了避免传统最大功率点跟踪算法在此情况下难以找到全局的最大功率点,文章提出了一种优化最大功率点跟踪算法,该算法适用于局部和全局阴影发生的情况。在局部阴影情况下,通过MATLAB仿真和样机试验与传统最大功率点跟踪算法相比,该优化算法能够判断阴影遮蔽情况是否发生,在局部和全局均一阴影的情况下都能够跟踪到全局最大功率点,避免光伏阵列的功率损失,提高光伏系统效率。In photovohaic （PV） power generation systems, the output of PV array is vulnerable to surroundings. The P-V curve of PV array contains several peaks under partially shaded condition （PSC） so that conventional maximum power point tracking （MPPT） methods can hardly find the real maximum power point （MPP）. To avoid that happens, this paper proposes an optimized MPPT strategy, which is not only fit for PSC but also suitable for uniform shaded condition （USC）. Comparing the optimized MPPT strategy and conventional MPPT methods, this paper illustrates the improved performance of optimized strategy under PSC. The simula- tion and experiment results show that the optimized strategy can obtain the evidence that shaded condition has occurred and tracks the global MPP precisely to improve the efficiency of PV systems

关 键 词：光伏阵列 局部阴影 多峰特性 最大功率点跟踪 

分 类 号：TK511[动力工程及工程热物理—热能工程]