光伏发电非线性步长最大功率跟踪研究  

Maximum power point tracking control method of PV based on non-linear step-size

作　　者：赵云凤[1] 李田泽[1] 陈世宝[1] 赵敬[1] 

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《可再生能源》2013年第1期17-20,共4页Renewable Energy Resources

基　　金：国家自然科学基金资助项目(50807034);山东省自然科学基金资助(ZR2011EEQ025);山东省淄博市科技发展资助项目(2011GG01116);山东理工大学重点学科资助项目

摘　　要：针对目前常见的光伏发电最大功率跟踪法跟踪效率不高、稳态波动大等缺点,文章提出一种新型非线性步长最大功率跟踪算法。该算法以扰动观察法为基础,采用了非线性步长,即e指数步长跟踪,当远离最大功率点时,采用正指数步长跟踪;接近最大功率点时,采用负指数步长。该算法还增加了局部最大功率判断环节,避免系统出现误判现象。通过Matlab/Simulink构建太阳能电池最大功率跟踪模型仿真,仿真结果验证了非线性步长最大功率跟踪算法的快速性、稳定性和准确性。A novel non-linear step-size maximum power point tracking （MPPT） technique is pro- posed to solve the normal MPFF questions of the lower tracking speed and stability. A new method based on perturbation and observation method （P＆O） uses the nonlinear step size,e func- tion, to track MPP. When it is near the maximum power point （MPP）, negative steps will be used. When it is far from the MPP, positive steps will be selected. A decision for the part MPP is added in the new algorithm to avoid misjudgment. At last, the MPlYF simulation model is made up in Matlab/Simulink, and the results demonstrate that the non-linear step-size MPPT has a better stability, speedability and accuracy.

关 键 词：光伏发电 最大功率跟踪 非线性步长 局部最大功率 

分 类 号：TK511[动力工程及工程热物理—热能工程]