电工技术学报2024，Vol.39Issue(16)：5149-5161,13.DOI:10.19595/j.cnki.1000-6753.tces.230934
基于双温度磁流体电弧仿真改进Mayr电弧模型的特快速暂态过电压仿真方法
The Very Fast Transient Overvoltage Simulation Method Based on Two-Temperature MHD Arc Simulation to Improve Mayr Arc Model
摘要
Abstract
Gas insulated switchgear(GIS)is the core equipment in ultra-high voltage(UHV)transmission engineering.During the process of closing short busbar in the UHV GIS disconnector,the very fast transient overvoltage(VFTO)will inevitably occur,causing insulation threats to the GIS and connected equipment,polluting the electromagnetic environment of secondary equipment,and seriously affecting the safe and stable operation of the power system.Since the accuracy of VFTO simulation is closely related to the equivalent arc model of the disconnertor,it is of great significance for VFTO simulation to establish an arc model that can more accurately characterize transient arc characteristics.In VFTO simulation studies,the traditional time-varying resistance arc model lacks accuracy and the classic arc black-box models rely too heavily on experimental data.To address the problems,an improved Mayr arc model based on two-temperature magnetohydrodynamics(MHD)simulation is established and applied to VFTO simulation to realize the simulation calculation of VFTO during the process of closing short busbar in the UHV GIS disconnector and verified in accuracy. Firstly,the arc-burning phenomenon during the process of closing short busbar in the UHV GIS disconnector are analyzed,combined with plasma thermodynamic equilibrium conditions and the high frequency characteristics of VFTO.The analysis results show that the arc plasmas in the arc-burning process are in the thermodynamic nonequilibrium state,thus the electromagnetic induction phenomenon cannot be ignored.According to the analysis,the time-varying electromagnetic field control equation is obtained through the Maxwell equation system and Lorentz specification.Subsequently,a two-temperature MHD arc model under multiphysics coupling is established by combining the time-varying electromagnetic field control equation and the airflow field control equation.Through the two-temperature MHD simulation,the arc time constant and heat dissipation power are obtained,the function relationship between the above key parameters and arc conductance is established through parameter fitting,and then the improved Mayr arc model is obtained.Finally,the equivalent model of the electric equipment in the test circuit was selected,and a VFTO simulation model was established,according to the structure of the test circuit,and then the VFTO simulation during the process of closing short busbar in the UHV GIS disconnector is carried out by using the improved Mayr arc model and several traditional arc models as equivalent disconnector module.In addition,the results of VFTO amplitude,main frequency and wavefront rise time of the improved Mayr arc model and several traditional arc models are simulated and compared. The compared results reveal that the VFTO simulation results obtained by the improved Mayr arc model reach great agreement with the measured results,and the VFTO simulation results under the improved Mayr arc model are more accurate than other traditional arc models.Furthermore,the above work shows that the improved Mayr arc model established by two-temperature MHD simulation can more accurately characterize the transient arc characteristics during the process of closing short busbar in the UHV GIS disconnector,improve the VFTO calculation accuracy compared with the traditional arc models,and reducing the dependence of VFTO simulation on experimental data.关键词
气体绝缘组合电器/隔离开关/特快速暂态过电压/磁流体动力学/电弧黑盒模型Key words
Gas insulated switchgear/disconnector/very fast transient overvoltage/magnetohydrodynamics/arc black-box model分类
信息技术与安全科学引用本文复制引用
崔建,孙帅,张国钢,陈允,崔博源..基于双温度磁流体电弧仿真改进Mayr电弧模型的特快速暂态过电压仿真方法[J].电工技术学报,2024,39(16):5149-5161,13.基金项目
国家电网有限公司科技项目资助(5500-202255135A-1-1-ZN). （5500-202255135A-1-1-ZN）
