摘要
微电网在孤岛运行时由于没有传统电网的支撑,容易出现电压频率不稳定,严重时甚至导致微电网无法安全稳定运行。针对孤岛微电网中负荷突变时电压及频率的波动问题,微源逆变器控制中存在的功率跟随以及缺乏惯性等问题,通过研究传统电网中同步发电机的结构及数学模型,分析虚拟同步机对电压及频率的控制,提出一种改进型的基于同步逆变技术的逆变器控制方法,并使用Matlab/Simulink搭建孤岛微电网及其控制仿真模型。仿真结果表明,在负载突变情况下,该控制策略能有效适应有功无功功率的变化,为微电网系统提供惯性,并保持微电网电压频率的稳定,验证了该控制策略的有效性及可靠性。
When the microgrid is running on an island,there is no support from the traditional power grid,and the voltage and frequency are unstable.Even when the microgrid is unable to operate safely and stably,the voltage and frequency fluctuations in the sudden change of load in the isolated microgrid are micro-sources.In the inverter control,there are problems of power following and lack of inertia.This paper studies the structure and mathematical model of synchronous generator in traditional power grid.It analyzes the control of voltage and frequency of virtual synchronous machine.It proposes an improved synchronization based on synchronization.Inverter control method of inverter technology,using Matlab/Simulink to build island microgrid and its control simulation model.The simulation results show that the control strategy can effectively adapt to the change of active power reactive power in the case of sudden load change.They provide inertia for the microgrid system,and maintain the stability of the microgrid voltage frequency,verifying the effectiveness of the control strategy and reliability.
作者
董鹤楠
韩子娇
董雁楠
唱一鸣
张稼楠
DONG Henan;HAN Zijiao;DONG Yannan;CHANG Yiming;ZHANG Jianan(Electric Power Research Institute of State Grid Liaoning Electric Power Co.,Ltd.,Shenyang,Liaoning 110006,China;State Grid Liaoning Electric Power Co.,Ltd.,Shenyang,Liaoning 110006,China;School of Electrical Engineering,Shenyang University of Technology,Shenyang,Liaoning 110870,China;State Grid Shenyang Power Supply Company,Shenyang,Liaoning 110003,China)
出处
《东北电力技术》
2020年第11期8-11,共4页
Northeast Electric Power Technology
关键词
微电网
电压频率稳定
同步逆变技术
负载突变
microgrid
voltage frequency stability
synchronous inverter technology
load mutation
