摘要
虚拟同步发电机(Virtual Synchronous Generator, VSG)技术是解决以电力电子变流器为接口的新能源渗透率,逐渐提高导致系统惯性与阻尼减小问题的有效方法。而其核心参数虚拟转动惯量一直缺少选取原则,特别是在多机并联以及出现的越来越多的变参数控制策略的情况下,参数选取不当极易造成系统震荡。以一个两机系统为例,搭建改进高阶小信号模型,对具有同步发电机特性逆变电源虚拟转动惯量 J 变化对系统的影响进行了详细分析,提出适用于自适应等灵活控制的 J 的选取原则,根据稳定阈值及系统运行要求对参数进行选取,可提高系统的稳定性能,并通过仿真和实验验证了分析结果的正确性。
The virtual synchronous generator (VSG) technology is an effective method to solve the problem of decreasing system inertia and damping caused by increasing the permeability of new energy source with power electronic converter as the interface. But the core parameters of the virtual rotational inertia have been lack of the selection principle. Especially in the case of multiple parallel machines and more variable parameter control strategies, the improper selection of parameters can easily cause system oscillation. Taking a two-machine system as an example, with the help of the high-order small signal model and its analysis method, the effect of virtual rotary inertia J with the characteristics of synchronous generator on the system is studied in detail. The selection principle of virtual moment of inertia J suitable for adaptive flexible control is proposed. The parameters are selected according to the stability threshold and system operation requirements, which can improve the stability performance of the system, and the correctness of the analysis is verified by simulation and experiment.
作者
颜湘武
王雨薇
郭玉威
贾焦心
刘正男
Yan Xiangwu;Wang Yuwei;Guo Yuwei;Jia Jiaoxin;Liu Zhengnan(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Grid Laiyuan Power Supply Company,Baoding 074300,Hebei,China)
出处
《电测与仪表》
北大核心
2019年第17期19-25,共7页
Electrical Measurement & Instrumentation
基金
中央高校基本科研业务费专项基金项目(2015MS88)
国家高技术研究发展计划项目(863计划)(2015AA050603)
关键词
虚拟同步发电机
小信号模型
转动惯量
稳定性
特征根
virtual synchronous generator
small signal model
rotary inertia
stability
characteristic root
