Describing the operating characteristics of solar array. 3, introducing the type and common operation of grid-connected inverter. Maximum power point tracking is the key issue in photovoltaic power generation system. Based on this, introducing several common MPPT control method in detail. 3,最大功率点跟踪问题是光伏发电系统中的重点问题,基于此,详细介绍了几种常用的MPPT控制方法。