虚拟惯性时间常数对互联电网小干扰稳定影响研究  

The influence of virtual inertia time constant on small disturbance stability in interconnected power grid system

作　　者：陈中[1,2] 殷大朋 朱英凯[3] 周涛 施志强 Chen Zhong;Yin Dapeng;Zhu Yingkai;Zhou Tao;Shi Zhiqiang(School of Electrical Engineering,Southeast University,Nanjing 210096,China;Jiangsu Key Laboratory of Smart Grid Technology and Equipment,Nanjing 210096,China;Nanjing Power Supply Company,Nanjing 210000,China)

机构地区：[1]东南大学电气工程学院,南京210096 [2]江苏省智能电网技术与装备重点实验室,南京210096 [3]南京供电公司,南京210000

出　　处：《电测与仪表》2018年第22期1-6,共6页Electrical Measurement & Instrumentation

基　　金：国家重点研发计划资助项目(2016YFB0900602);国家自然科学基金资助项目(51277029);江苏省智能电网技术与装备重点实验室课题资助

摘　　要：传统同步发电机的惯性时间常数是不变的物理参数,虚拟同步发电机的推广与应用使得系统惯性时间常数具有可变性和可调性,继而有可能影响互联系统的小干扰稳定性。论文以VSC-HVDC为研究对象,对其进行虚拟同步发电机控制建模,然后基于特征分析法,对等值联网系统求解低频振荡衰减因子的解析表达式,分析了不同场景下惯性时间常数对小干扰稳定水平的影响程度,发现当惯性时间常数与阻尼系数在同一个数量级时对小干扰稳定有较大影响。最后在两区四机经典模型中验证了结论,对于虚拟同步发电机参数整定和研究互联系统的小干扰稳定性分析及控制具有一定的参考价值。In the traditional power grid system, the inertia time constant of a synchronous generator is an invariant physical parameter. However, with the application and popularization of the virtual synchronous generators, the inertia time constant of the system becomes variable and adjustable, which may affect the small disturbance stability of the interconnected system. VSC-HVDC is taken as the research object and the virtual synchronous generator control is built on it. Then, based on the eigenvalue analysis method, the analytic expression of the low-frequency oscillation attenuation factor for the equivalent networking system is solved, and the degree of influence of the inertial time constant on the stability lev- el of small disturbance is analyzed. In the proposed method, the inertia time constant has a great influence on the small disturbance stability when being in the same order of magnitude with damping coefficient. Finally, the influence of the in- ertia time constant on the regional low frequency oscillation mode is verified in the classical model of 2-area 4-generator, which has certain reference value for the analysis and control of the regional small disturbance stability of the interconnected power system and the virtual synchronous generator parameter setting.

关 键 词：小干扰稳定 互联交流电网 惯性时间常数 特征分析法 虚拟同步发电机 

分 类 号：TM712[电气工程—电力系统及自动化]