基于改进MPPT的光伏发电系统仿真研究

摘要

光伏发电系统中，对电源的输出功率进行最大功率点跟踪( MPPT)是极其重要的。为了提高光伏电池的发电效率，提出了一种改进的扰动观察法进行最大功率跟踪，不仅能很快很准地跟踪最大功率，而且能使系统的稳定性得到保持。通过对逆变器的控制策略进行研究，提出了一种双闭环控制方式，能够保持输出电压稳定，满足微网孤岛运行要求。通过仿真结果，可以看出该方法的有效性与可行性。%In photovoltaic power generation system, the maximum power point tracking ( MPPT) is very important for power supply. In order to improve the power generation efficiency of the photovoltaic cells, an improved disturb-ance observer method is proposed for maximum power tracking, This method can not only quickly tracking the max-imum power with good accuracy, but aslo maintain the stability of the system. Based on the control strategy of in-verter, a double closed loop control method is proposed, which can keep the output voltage stable and meet the re-quirements of micro grid operation. The validity and feasibility of the method is verified by the simulation results.