基于改进扰动观察法的光伏阵列最大功率点跟踪

Photovoltaic Array Maximum Power Point Tracking Based on Improved Perturbation and Observation Method

常规的扰动观察法具有算法简洁、跟踪效率高的特点,在光伏阵列的最大功率点跟踪系统中得到广泛的应用。然而常规扰动观察法由于采用固定的扰动步长,难于同时获得较高的响应速度和稳态跟踪精度。本文提出了一种固定电压启动的变步长扰动观察算法,并与常规的扰动观察法进行了对比实验,实验结果证明了该方法的有效性。

The conventional perturbation and observation（P＆O） method is widely used in the photovoltaic array maximum power point tracking system due to its succinctness and high tracking efficiency. However, the excellent dynamic response and stable performance of the P＆O algorithm is difficult to achieve synchronously due to adopting fixed perturbation step size. An improved P＆O algorithm with constant-voltage-start and variable step size is proposed in this paper. The contrastive experimental results of the improved and conventional algorithm are presented to demonstrate its effectiveness.