摘要
采用虚拟同步发电机(VSG)策略的电压源逆变型分布式电源(ⅡDG)的暂态特性与同步发电机类似,而其电流饱和环节使其暂态特性又有别于同步发电机,使系统暂态稳定分析变得更加复杂。基于能量函数法提出了一种计及VSG-ⅡDG电力系统的暂态能量函数。通过分析暂态过程中逆变器的暂态特性,以此构建其虚拟功角模型,并分析了电流饱和环节对能量函数的影响,基于此,采用输出功率拟合方法构建了计及VSG-ⅡDG的系统暂态能量函数。利用MATLAB/Simulink进行了仿真,验证了该方法的有效性。
The transient characteristics of the voltage source ⅡDG using VSG strategy are similar to the synchronous generator, but when the current saturation link is considered, their transient characteristics will be different, and the system transient analysis will be more complex. This paper put forward a kind of transient energy function with VSG-ⅡDG power system based on the energy function. This paper built the virtual power angle model of the inverter by analyzing the inverter transient characteristic during the transient process and analyzed the influence of the current saturation link on the energy function. On the basis of this, the output power fitting method was adopted to establish the transient energy function with the VSG-ⅡDG power system. Simulink in MATLAB was used to carry out simulation and to verify the effectiveness of this method.
作者
焦永辉
卜京
张宁宇
周前
汪成根
刘建坤
JIAO Yong-hui;BU Jing;ZHANG Ning-yu;ZHOU Qian;WANG Cheng-gen;LIU Jian-kun(School of Automation,Nanjing University of Science and Technology,Nanjing 210094,China;State Grid Jiangsu Electric Power Company Research Institute,Nanjing 2111 00,China)
出处
《电工电气》
2019年第3期7-11,共5页
Electrotechnics Electric
基金
国家电网公司科技项目(5210EF17001G)
关键词
虚拟同步发电机
逆变器
虚拟功角特性
暂态稳定
能量函数
功率拟合
VSG
inverter
virtual power angle characteristic
transient stability
energy function
output power fitting
