基于改进变步长电导增量法的光伏阵列最大功率点跟踪  

Application of Dichotomy in PV Variable Step Size Mppt System

作　　者：黄勤[1] 赵靖[1] 凌睿[1] 

机构地区：[1]重庆大学自动化学院,重庆400030

出　　处：《世界科技研究与发展》2013年第6期700-703,共4页World Sci-Tech R&D

基　　金：国家自然科学基金(61203097);中国博士后科学基金(2012M511907);中国博士后科学基金(2013T60840)资助;中央高校基本科研业务费(CDJRC10170007)

摘　　要：针对目前变步长最大功率跟踪在复杂光照条件下的振荡问题,结合二分法查找原理,提出了一种改进的变步长电导增量法。采用boost电路作为阻抗匹配装置,此电路占空比大小与系统输出功率相对应。最大功率点附近的工作点对应的占空比,是一组有序数据。对该组数据使用二分法查找,搜寻到最大功率点所对应的占空比,以实现最大功率的跟踪。仿真结果表明,提出的算法能够有效地抑制变步长跟踪过程中的振荡。与常见的变步长算法相比,改进算法更易实现,且具有更强的适应性。Aiming at the oscillation problem of variable step size Maximum Power Point Tracking when irradianee complex changes, and combined with the Dichotomy Find principle, an improved variable step size Incremental Conductance algorithm is prdpesed. Applying boost cir- cuit as the impedance matching device, duty cycle is corresponds to the system output power. The duty cycle of the operating point which nearby the maximum power point are an ordered set of data. Using the Dichotomy Find to this data,find out the duty cycle of the maximum power point to achieve maximum power tracking. The simulation results show that, in complex irradiance conditions, the proposed algorithm can effectively suppress the oscillations in variable step size tracking process. Compared with the conventional variable step size method,the proposed approach can be easily implemented, and have more adaptability.

关 键 词：光伏阵列 最大功率点跟踪 变步长 二分法 

分 类 号：TM615[电气工程—电力系统及自动化]