说明：  本次设计介绍了并网逆变器的数学模型、PQ 恒功率控制原理,搭建了 PQ 控 制模型,验证了 PQ 控制的运行特性,实现了有功无功功率的任意调节。
(This design introduces the mathematical model of the grid-connected inverter and the PQ constant power control principle. The PQ control model is built to verify the operating characteristics of the PQ control and realize the arbitrary adjustment of the active and reactive power.)