基于占空比最优寻迹的光伏电池最大功率点跟踪方法

Photovoltaic Cell Maximum Power Point Tracking Based on Duty Cycle Optimization Method

针对传统的扰动观察法在光伏电池输出接近最大功率时跟踪能力下降及输出功率易产生波动的缺陷,提出了一种基于占空比最优寻迹的光伏电池最大功率点跟踪控制方法。在算法的迭代过程中,采用了两个占空比,并不断调整其大小。新一轮迭代时,占空比的搜索空间缩小为上一轮的0. 618倍,有利于算法的快速收敛。光伏电池的输出功率越接近其最大功率,两个占空比就越接近,具有抑制光伏电池输出功率波动的作用。

In view of the traditional disturbance observation method,when the output of photovoltaic cell is closed to its maximum power the tracking capacity of the method drops and the output power of the photovoltaic cell tends to oscillate.This paper proposes a maximum power point tracking algorithm for photovoltaic cell based on duty cycle optimization method.In the iterative process,the algorithm adopts two duty cycles and they're constantly adjusting.During each iterative process,the search space decreased to 0.618 times as the previous round,so the convergence rate of the algorithm is fast.When the output of the photovoltaic cell is closer to the maximum power,the closer the two duty cycles are.It can restrain the power fluctuation of photovoltaic cell.