摘要
虚拟同步发电机的功率耦合会加剧频率的振荡,引发系统的失稳,通过分析虚拟同步发电机并网时系统的稳定性,建立并网虚拟同步发电机功率耦合小信号模型,推导出功率耦合下的频率闭环传递函数,采用伯德图和极点图判定在不同阻抗下频率稳定性,引入虚拟阻抗以减弱频率的不稳定振荡。结果表明,当电网侧电抗数值一定时,虚拟阻抗中电感从0增大至11.2 mH时,尖峰谐振的幅值逐渐达到零负,频率逐渐趋向于稳定。
This paper is an attempt to address the system instability caused by the increasing oscillation from the power coupling phenonmenon of virtual synchronous generator. The study involves analyzing the system stability of the virtual synchronous generator on grid;establishing a power coupling small signal model of the grid-connected virtual synchronous generator;deriving the frequency closed-loop transfer function under power coupling;using Bird plot and pole plot to determine the frequency stability under different impedances;introducing the virtual impedance to weaken the unstable oscillation of the frequency.The results show that when the reactance value on the grid side is constant, the inductance in the virtual impedance increases from 0 to 11.2 mH, and the amplitude of the peak resonance gradually reaches zero negative, the frequency gradually tends to be stable.
作者
苏勋文
姜泽浩
张荣浩
王浠再
Su Xunwen;Jiang Zehao;Zhang Ronghao;Wang Xizai(School of Electrical&Control Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)
出处
《黑龙江科技大学学报》
2023年第1期87-92,共6页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省省属高校基本科研业务费项目(2021-KYYWF-1467)。
关键词
虚拟同步发电机
功率耦合
频率耦合
频率振荡
虚拟阻抗
virtual synchronous generator
power coupling
frequency coupling
frequency oscillation
virtual impedance
