摘要
针对虚拟同步发电机(VSG)控制技术的逆变器并联结构,为保证系统的稳定运行,对其小信号稳定性分析技术展开研究。首先根据VSG主电路结构和现有控制策略建立两机并联时域小信号模型。然后利用系统状态空间矩阵的根轨迹法讨论了关键控制参数变化对系统特征根分布的作用,从而揭示了参数摄动对并联系统稳定性的影响。最后通过样机实验表明,在上述稳定性分析的指导下,参数优化搭配选取有利于实现VSG并联系统的稳定运行。
For safe running of inverter parallel structure based on virtual synchronous generator(VSG) control technology ,the method of stability analysis for the parallel system is discussed.Firstly , time-domain small signal model is constructed according to the structure of main circuit and existing control strategy of VSG.Secondly, effects of different control parameters on the distribution of eigenvalues of the system are discussed based on root locus analysis of the system state matrix.Thus, relationship between parameter variation and stability of parallel system can be obtained.Finally ,the experimental results demonstrate that proper setting of control parameters under the guidance of stability analysis stated above is beneficial for the steady operation of VSG connected in parallel.
作者
韦徵
沈茜
姬秋华
王彤
WEI Zheng;SHEN Qian;JI Qiu-hua;WANG Tong(Nanjing NARI Group Co.,Ltd.,Nanjing 210003,China)
出处
《电力电子技术》
CSCD
北大核心
2019年第8期11-15,共5页
Power Electronics
基金
国家电网总部科技项目(52010118000N)~~
关键词
虚拟同步发电机
并联系统
时域小信号模型
稳定性分析
virtual synchronous generator
parallel system
time-domain small signal model
stability analysis
