中文说明：
利用模糊准PR 控制方法跟踪控制三电平逆变器的并网电流，逆变器采用基于60°坐标系的简化 SVPWM 调制算法。
English Description：
The fuzzy quasi PR control method is used to track and control the grid current of three-level inverter, and the simplified SVPWM modulation algorithm based on 60 ° coordinate system is adopted.