单相并网逆变器并网电流中含有大量谐波，传统的PI 控制器难以满足波形跟踪需要，此处采用比例+复的复合控制算法用于逆变器电流环控制器设计(The single-phase grid-connected inverter has a large amount of harmonics in the grid-connected current. The traditional PI controller can not meet the needs of waveform tracking. Here the proportional + complex compound control algorithm is used for the inverter current loop controller design.)