基于电弧模型的直流开关振荡回路参数研究  

Research on Parameters of DC Switch Oscillation Circuit Based on Arc Model

作　　者：于雷 李劲彬 袁佳歆[3] 王伊帆 蒋紫薇[3] 李佳伟 Yu Lei;Li Jinbin;Yuan Jiaxin;Wang Yifan;Jiang Ziwei;Li Jiawei(State Grid Hubei Direct Current Company Yichang 443000,China;State Grid Hubei Electric Power Research Institute Wuhan 430077,China;School of Electrical Engineering and Automation Wuhan University Wuhan 430072,China)

机构地区：[1]国网湖北省电力有限公司直流公司,宜昌443000 [2]国网湖北省电力有限公司电力科学研究院,武汉430077 [3]武汉大学电气与自动化学院,武汉430072

出　　处：《电工技术学报》2023年第S01期187-195,213,共10页Transactions of China Electrotechnical Society

基　　金：湖北省自然科学基金杰出青年基金(2020CFA098);国家自然科学基金(52207182)资助项目。

摘　　要：振荡回路在直流开关开断过程中通过提供振荡电流来创造“过零点”,振荡过程对成功开断与否具有决定性作用,因此亟须研究振荡回路参数对开断的影响。现有研究尚未在结合开断回路电弧特性的基础上考虑振荡回路寄生参数,存在参数不匹配、准确性低等局限性。该文首先根据实际工程参数,建立了含寄生参数的等效多电容组合的振荡回路改进模型。然后,基于Simulink仿真平台对振荡回路改进模型开展仿真研究;同时开展了振荡回路本体特性实验,验证了仿真的正确性。最后,在考虑电弧特征的基础上,深入研究振荡回路参数对开断过程的影响机理,得出了RLC参数与开断特性间的映射关系。The DC transfer switch is an essential piece of equipment in ultra-high voltage DC transmission projects.It is mainly used to increase the flexibility of transmission operations and to protect and remove faults.The DC transfer switch is composed of three parts:the breaking circuit,energy absorption circuit,and oscillation circuit.The oscillation circuit creates a“zero-crossing point”by providing oscillation current during the DC switch breaking process.The oscillation process plays a decisive role in the successful breaking or not.Therefore,it is urgent to study the influence of oscillation circuit parameters on the breaking.The parameters of capacitors in the oscillation circuit are affected by manufacturing,transportation,use,and other processes,which may result in initial type faults,occasional faults,overload operation faults,and aging operation faults.A fault can cause a change in the capacitance value,which may cause the DC switch to fail to open.The existing research has not yet considered the parasitic parameters of the oscillation circuit based on the arc characteristics of the breaking circuit,which has limitations such as parameter mismatch and low accuracy.Moreover,there is limited research on various arc models applicable to DC conversion switches.This article first analyzes in detail the principles and characteristics of various arc models.Then,based on the parameters of a certain ultra-high voltage DC transmission system,an improved model with equivalent multi-capacitor combination and parasitic parameters is constructed to improve the accuracy of the oscillating circuit model.Next,simulation research on the improved oscillating circuit model is carried out based on the Simulink simulation platform,and the characteristics of the oscillating circuit itself are also experimentally studied on site.The theoretical calculation results,simulation results and experimental results are compared and analyzed to verify the correctness of the model.Subsequently,the equivalent arc model of the breaking circ

关 键 词：电弧模型 直流开关 振荡回路 电容 

分 类 号：TM561.6[电气工程—电器]