基于PLL的VSG并网控制研究  

Research on Grid-Connected Control of VSG Based on PLL

作　　者：杨洋[1] 丁树业[1] 徐峥嵘[1] 杨旭[1] 王顺 Yang Yang;Ding Shuye;Xu Zhengrong;Yang Xu;Wang Shun(School of NARI Electrical and Automation,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京师范大学南瑞电气与自动化工程学院

出　　处：《南京师范大学学报（工程技术版）》2020年第1期20-24,共5页Journal of Nanjing Normal University(Engineering and Technology Edition)

基　　金：国家自然科学基金项目(51977112);江苏省自然科学基金项目(BK20191370)

摘　　要：新能源通过电力电子接口接入电网也为电网的稳定运行带来了新的挑战,逆变器由离网模式切换到并网运行模式的瞬间容易产生较大的冲击电流.现提出一种基于锁相环虚拟同步发电机的预同步并网控制技术能够有效解决这一问题.该控制策略下的逆变器能够平滑并网、电压相位的同步追踪有效抑制了冲击电流、实现离并网的快速切换,同时改善了并网逆变器的性能、增强了电网的稳定性.最后,通过搭建并网虚拟同步发电机模型验证了该设计的正确性和有效性.The access of new energy to power grid through power electronic interface also brings new challenges to the stable operation of power grid.The inverter has a large impact current at the moment when it is switched from the off-grid mode to the grid-connected mode.This paper presents a pre-synchronous grid-connected control technology of Virtual Synchronous Generator based on Phase Locked Loop,which can effectively solve this problem and quickly enter the grid-connected operation.The inverter under this control strategy can achieve a smooth grid-connected mode,synchronously track the phase of voltage,effectively suppress a large impact current,fastly realize switching from the off-grid mode to the grid-connected mode.Meanwhile,it has improved the performance of inverter in the grid-connected mode,and enhanced the stability of the power grid.Finally,the grid-connected Virtual Synchronous Generator model is built to verify the correctness and effectiveness of the design.

关 键 词：虚拟同步发电机 锁相环 预同步 

分 类 号：TM761[电气工程—电力系统及自动化]