一种改进的虚拟同步机控制策略  

An Improved Control Strategy of Virtual Synchronous Machine

作　　者：魏亚龙 王瑞 王林[2] 黄辉[2] WEI Ya-long;WANG Rui;WANG Lin;HUANG Hui(Xi'an XJ Power Electronics Technology Co,Ltd.,Xi'an 710075,China)

机构地区：[1]西安许继电力电子技术有限公司,陕西西安710075 [2]许继集团有限公司,河南许昌461000

出　　处：《电力电子技术》2021年第5期78-81,共4页Power Electronics

基　　金：国家自然科学基金(51777159)。

摘　　要：在此提出一种改进的虚拟同步发电机(VSG)控制方法,可在无需离网建立机端电压和并网预同步环节情况下,实现直接并网启动控制。首先,结合传统VSG数学模型,详细介绍了改进的VSG数学模型,指出改进的VSG模型具备锁相环功能;其次,建立系统小信号稳定性分析模型,针对VSG模型中惯量、阻尼、虚拟定子电阻和虚拟定子电抗等参数对系统稳定性的影响,进行详细理论分析;最后,搭建Matlab/Simulink仿真模型和100 kW模块化T型三电平并网逆变器并联实验平台,仿真和实验验证了所提控制方案的有效性。An improved control method of virtual synchronous generator(VSG)is proposed,which can realize the startup control of direct grid connection without the need of off grid voltage and grid connection pre synchronization.Firstly,combining with the traditional VSG mathematical model,the improved VSG mathematical mode is introduced,and points out that the improved VSG model has the function of phase-locked loop under the specific working condition,secondly,the small signal stability analysis model of the system is established,and a detailed theoretical analysis is made aiming at the influence of inertia,damping,virtual stator resistance and virtual stator reactance on the system stability in the VSG model.Finally,Matlab/Simulink simulation model and 100 kW modular T-type threelevel grid connection inverter parallel experiment platform are built.Simulation and experiment verify the effectiveness of the proposed control scheme.

关 键 词：虚拟同步发电机 直接并网 逆变器 

分 类 号：TM31[电气工程—电机]