基于改进型变步长电导增量法的最大功率点跟踪策略  

Maximum Power Point Tracking Strategy Based on Modified Variable Step-Size Incremental Conductance Algorithm

作　　者：周东宝 陈渊睿[1] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640

出　　处：《电网技术》2015年第6期1491-1498,共8页Power System Technology

基　　金：国家自然科学基金项目(51177050);国家自然科学基金青年基金项目(60904078)~~

摘　　要：光伏电池的输出特性会随着外界环境的变化而改变,利用最大功率点跟踪(maximum power point tracking,MPPT)技术可有效提高光伏发电系统的效率。针对现有MPPT控制方法的不足,提出了一种基于改进型变步长电导增量法的MPPT控制方法。该方法采用一种新的步长调整系数,可根据外界环境变化自动调整步长,即使光照剧烈变化时,系统始终保持较大步长运行,克服了传统变步长算法启动速度和光照剧烈变化时动态响应速度慢的问题;同时采用电压闭环控制,提高了系统的整体稳定性。仿真和实验结果证明了该方法的可行性。The output characteristics of photovoltaic （PV） cell vary with the environment, maximum power point tracking techniques are thus employed to enhance the efficiency of PV generation system. Based on the analysis of existing maximum power point tracking（MPPT） methods, a modified variable step size incremental conductance algorithm is proposed. The proposed strategy adopts a novel adjustment factor to adjust the step size in accordance with the environment, which makes PV system keep a larger step size even under enormous irradiance changes. Compared with the conventional variable step size method, the propose approach can improve the start and dynamic response speeds at sudden changing irradiance. Besides, a voltage close-loop control is used to ensure the stability of the system. Simulation and experiment results validate the effectiveness of the proposed algorithm.

关 键 词：变步长 电导增量法 步长调整系数 光伏系统 最大功率跟踪 电压闭环 

分 类 号：TM721[电气工程—电力系统及自动化]