基于序阻抗的虚拟同步机同步频率谐振现象  

Synchronous Frequency Resonance in Virtual Synchronous Generator Based on Sequence-Impedance

作　　者：于彦雪 关万琳 陈晓光 李浩昱[1] Yu Yanxue;Guan Wanlin;Chen Xiaoguang;Li Haoyu(School of Electrical Engineering&Automation,Harbin Institute of Technology,Harbin 150001,China;Electric Power Research Institute of State Grid Heilongjiang Electric Power Co.Ltd,Harbin 150030,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001 [2]国网黑龙江省电力有限公司电力科学研究院,哈尔滨150030

出　　处：《电工技术学报》2022年第10期2584-2595,共12页Transactions of China Electrotechnical Society

基　　金：黑龙江电力公司科技资助项目(522437200038)。

摘　　要：针对虚拟同步机(VSG)的同步频率谐振(SFR)现象,鉴于多输入多输出功率耦合模型的不足,通过建立可描述VSG宽频域动态特性的单输入单输出序阻抗模型,提出一种基于序导纳和序阻抗的SFR分析方法,并对单环和多环控制VSG的SFR现象进行对比研究。基于序导纳的极点分布,有效研究SFR与VSG功率环控制参数、虚拟阻抗、内环控制及电网阻抗之间的关系;基于序阻抗的频率特性曲线,对比内环控制引入前后SFR的阻尼特性,从“负阻尼”的角度揭示单环和多环控制VSG的SFR谐振机理;搭建基于RT-Box的实验平台,验证VSG在不同控制方案及不同电网阻抗下的SFR现象,指明VSG控制的优化设计方向。As for the synchronous frequency resonance(SFR)phenomenon existing in virtual synchronous generator(VSG),considering the shortcomings of multi-input multi-output power coupling SFR analysis models,a sequence-admittance and sequence-impedance based SFR analysis method is proposed by modeling the single-input single-output sequence impedance model that can describe the wide-frequency dynamics of the VSG,and the SFR phenomena of single-loop and multi-loop VSG are comparatively studied.Based on the pole distribution map of sequence admittance,the relationships between SFR and the VSG power control loop parameters,virtual impedance,inner-loop control and grid impedance are effectively studied.Based on the Bode diagrams of sequence-impedance,the damping characteristics of SFR with and without the inner-loop control are compared,and then the resonance mechanism of SFR in single-loop and multi-loop VSG is revealed from the perspective of negative damping.By building the experimental platform based on the RT-Box,the SFR phenomena of VSG under different control schemes and grid impedances are verified,indicating the optimal design direction of VSG control.

关 键 词：虚拟同步机 同步频率谐振 序阻抗 负阻尼 内环控制 

分 类 号：TM464[电气工程—电器]