说明：  这是一个单相并网逆变器滑模变结构控制，采用滑模变结构控制方法对其进行稳定性控制，并实现有源阻尼控制。
(This is a single-phase grid-connected inverter sliding mode variable structure control, using sliding mode variable structure control method to its stability control, and to achieve active damping control.)