摘要
虚拟同步发电机(virtual synchronous generator,VSG)在运行过程中会因为突变现象而出现系统分岔曲线改变和VSG电压骤降或骤升等问题,不利于VSG的稳定运行。针对这个问题,首先,建立了以直流母线电容器电压方程为摆幅方程的VSG数学模型;其次,基于分岔和突变理论分别讨论了在内部参数和外部运行工况变化下VSG中出现的突变现象并揭示了突变机制;然后,划分了参数稳定区域并用时域仿真验证了所划分区域的正确性;最后,分析了突变对VSG电压支撑能力的影响。结果表明,突变是通过鞍结分岔点发生的,不同参数变化引起的突变是不同的,当发生电压骤降的突变时,VSG电压支撑能力会提高;当发生电压骤升的突变时,VSG电压支撑能力会减弱;在参数稳定区域内,VSG不会出现突变现象。
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.
作者
马晓阳
杨顺
刘宇
王晓冰
汪颖
MA Xiaoyang;YANG Shun;LIU Yu;WANG Xiaobing;WANG Ying(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;Changdian New Energy Co.,Ltd.,Wuhan 430024,China;State Grid Beijing Electric Power Company Economic and Technological Research Institute,Beijing 100055,China)
出处
《中国电力》
北大核心
2025年第7期91-104,共14页
Electric Power
基金
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)。
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
bifurcation theory
catastrophe theory
three-phase voltage source inverter
virtual synchronous generator
voltage catastrophe
