给不想花费大量时间用Visio画图的人，文件包括组串式，集中式，直流模块式，主从结构等光伏阵列构成图，及单相单极式光伏并网逆变器电路图等内容。(For those who don't want to spend a lot of time drawing with Visio, the files include cluster-type, centralized, DC-module, master-slave structure and other photovoltaic arrays, and single-phase single-pole photovoltaic grid-connected inverter circuit diagrams.)