中文摘要：

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。

英文摘要：

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.