中文摘要：

以三相光伏并网发电系统作为研究对象,并采用一种先进的控制策略即虚拟同步发电控制技术,该控制技术基于模拟同步发电机运行的思想,使得光伏并网系统具有同步发电机的外特性.本文首先建立光伏发电单元数学模型,然后建立虚拟同步发电机的数学模型,再在Matlab仿真软件中建立光伏并网发电系统结构,同时建立虚拟同步发电机控制仿真模块,最后通过仿真验证基于虚拟同步发电技术的光伏并网系统可行性.

英文摘要：

An advanced control strategy is proposed on the basis of the three-phase grid-connected photovoltaic（PV） systems,which is virtual synchronous generator,making grid-connected PV systems possess external characteristic of the synchronous generator based on the idea for operation of mimic synchronous generator.Firstly,a mathematical model of photovoltaic power generation is established,and then a mathematical model of virtual synchronous generator is created,and lastly photovoltaic power generation system structure is built on Matlab simulation software platform,while a simulation control module of virtual synchronous generator is also set up.Finally,feasibility of grid-connected photovoltaic based on virtual synchronous is verified by simulation results.