中国电力2025，Vol.58Issue(7)：91-104,14.DOI:10.11930/j.issn.1004-9649.202501032
基于分岔和突变理论的VSG突变机理研究
VSG Catastrophe Mechanism Based on Bifurcation and Catastrophe Theories
摘要
Abstract
The virtual synchronous generator(VSG)may have problems that the system bifurcation curve changes and the VSG voltage drops or rises due to catastrophe phenomena during operation,which is not conducive to the stable operation of the VSG.To address these problems,a VSG mathematical model with direct current bus capacitor voltage equation as the swing equation was firstly established.Secondly,the catastrophe phenomenon occurring in the VSG under the variations of internal parameters and external operating conditions were respectively discussed and the catastrophe mechanism was revealed based on the bifurcation and catastrophe theories.Then,the parameter stability regions were partitioned and the correctness of the partitioned regions were verified by time-domain simulation.Finally,the effect of catastrophe on VSG's voltage support capacity was analyzed.The results show that the catastrophe occurs through saddle-node bifurcation points and changes with different parameters;the VSG voltage support capability increases when catastrophe occurs with voltage dropping,while the VSG voltage support capability decreases when catastrophe occurs with voltage swelling;within the parameter stability regions,the VSG is not subject to catastrophe.关键词
分岔理论/突变理论/三相电压源逆变器/虚拟同步发电机/电压突变Key words
bifurcation theory/catastrophe theory/three-phase voltage source inverter/virtual synchronous generator/voltage catastrophe引用本文复制引用
马晓阳,杨顺,刘宇,王晓冰,汪颖..基于分岔和突变理论的VSG突变机理研究[J].中国电力,2025,58(7):91-104,14.基金项目
国家自然科学基金资助项目(计及线路分布参数演变规律的风电并网系统宽频谐振稳定性边界研究,52107117). This work is supported by National Natural Science Foundation of China(Research on the Stability Boundary of Broadband Resonance for Wind Power Grid-Connected System Considering the Evolution Law of Line Distribution Parameters,No.52107117). （计及线路分布参数演变规律的风电并网系统宽频谐振稳定性边界研究,52107117）
