基于虚拟同步电机原理的微网逆变器控制及其仿真分析

Microgrid inverter control based on virtual synchronous generator principle and its simulation analysis

基于微电网逆变器的数学模型与同步电机数学模型的相似性,建立三相电压型逆变器的虚拟同步电机模型.分析虚拟感应电势的作用,提出将虚拟调速系统和虚拟励磁系统应用到微电网逆变器的控制策略,给出系统参数设计原理和仿真模型结构.采用该控制策略的逆变微电源具有调压调频和功率控制的2种功能,能分别适用于微电网的孤岛运行和联网运行工作模式.仿真分析结果验证了该控制策略的有效性.

Based on the similarity between mathematical models of microgrid voltage source inverter（VSI） and synchronous generator,a virtual synchronous generator model for three-phase VSI is established in this paper.The function of virtual induced electromotive force（EMF）is analyzed,and the control strategy that can be applied in virtual regulating system and virtual excitation system in microgrid inverter is proposed.The principle for system parameters design and the simulation model structure are presented.The mocrogrid inverters adopting the control strategy are capable of voltage/frequency regulation as well as power control.They can be used in both operation models of island and connection.Simulation analysis results verify the control strategy effectiveness.