基于滑模极值搜索-PI复合控制的光伏发电系统最大功率点跟踪仿真研究

摘要

为了提高光伏发电系统的效率和可靠性,需要对光伏发电系统中最大功率点进行跟踪。为了消除滑模极值搜索算法在最大功率点附近产生的振荡问题,提出了滑模极值搜索-PI复合控制方法。分析了该控制算法的原理,并设计了相应的控制系统。在Matlab/Simulink环境下建立动态模型进行仿真研究,实现了对光伏发电系统的最大功率点快速、准确地跟踪,并去除了最大功率点处振荡,提高了系统稳定性和能量转换效率,具有一定的实用价值。%In order to improve the efficiency and reliability of photovoltaic power generation system,the PV system must contain a maximum power point tracking(MPPT) function.To eliminate the oscillation occurrences near the maximum power point due to extremum seeking algorithm with sliding mode,the compound control of sliding mode extremum seeking and PI was proposed.The principle of this control algorithm was analyzed and the corresponding control system was designed.In the context of Matlab/Simulink,dynamic model was constructed and simulation research was conducted.The results demonstrate that this proposed practical method could track the maximum power point of PV systems quickly and accurately,removing the oscillation near MPP and improving the system stability and energy conversion efficiency.