基于滑模变结构PI控制的光伏系统MPPT研究

Novel hybrid control of MPPT method based on sliding mode variable structure and PI strategy

在分析光伏电池的数学模型和输出特性基础上,给出基于改进的Zeta电路的滑模变结构控制策略。为实现光伏系统最大功率点跟踪(MPPT)的优化控制,提出可变阀值切换的滑模变结构+PI复合控制策略,实现了最大功率跟踪的优化控制。通过仿真与实验结果分析,并将给出的控制策略与广泛应用的扰动观测MPPT策略进行比较,验证了本控制策略具有良好的特性。

Based on the analysis results of the photovoltaic power generation model and its output character, the proposed controller of sliding mode variable structure based on improved Zeta converter was proposed to realize Maximum Power Point Tracking （MPPT） of photovoltaic system. In order to obtain the optimized maximum power point control, the novel hybrid control of the Sliding Mode Variable Structure with variable switch parameter and PI strategy were presented. By comparing traditional P＆O method with the proposed method by simulation and experiment, the good characters of the proposed method were verified.