摘要
Abstract
In the photovoltaic power generation and active filter ( PV-AF) system, Maximum Power Point Tracking ( MPPT) of photovoltaic cells method is one of the key technologies. Aiming at the problems existed in common con-trol types of constant voltage methods in MPPT, an improved method of MPPT is proposed in this paper. Using the characteristic that the numbers of positive steps and reverse steps are basically the same, it will judge whether the sys-tem is near the maximum power point or not. Based on this, a kind of variable step perturbation and observation meth-od is presented, in which a large step will be adopted to perturb when it lies far from the Maximum Power Point ( MPP) , , and a small step will be adopted to perturb when it is near the maximum power point. After confirming the system working near the maximum power point, the constant voltage method will be taken instead. The maximum tracking error of perturbation and observation method is 1. 5 voltage perturbation step, while the new MPPT method put forward reduce the error to 0 . 5 voltage perturbation step . Simulation and experiment results show that the im-proved method gives consideration to rapidity, accuracy and stability.关键词
PV-AF/MPPT/扰动观察法/恒定电压法/变步长Key words
PV-AF/MPPT/perturbation and observation method/constant voltage method/variable step分类
信息技术与安全科学
