双门限值变步长光伏最大功率点跟踪

A Variable Step Algorithm with Double-Threshold of Maximum Power Point Tracking for Photovoltaic System

针对传统的干扰观察法和变步长干扰观察法的不足,提出了双门限值变步长光伏最大功率点跟踪法.该方法分别将功率曲线的斜率值乘以和除以输出电流而得到2个步长选择标准,每一标准下设一门限值.利用Matlab/Simulink工具建立相应的光伏阵列控制模型,对该方法和变步长干扰观察法的仿真.结果表明:该方法跟踪速度快、稳定性高,特别是当光强突变时也能快速地追踪到最大功率点.

To solve shortcomings of traditional interference observation and variable step interference observation, a new method, a variable step algorithm with double-threshold of Maximum Power Point Tracking for photovoltaic system is presented. There are two step standards of selection and there is a threshold each standard. The two step standards are obtained by slope value of power curve multiplied by the output current and divided by the output current respectively. Control model of the photovoltaic array is established with Matlab/Simulink. The results demonstrate that the Algorithm provides a quick and accurate tracking, even under sudden changes in light.