特高压直流高速开关研发关键技术研究  

Research on Key Technology of Ultra High Voltage DC High Speed Switch

作　　者：吕金壮[1] 陈兵[1] 张长虹[1] 李明洋 黎卫国[1] 杨旭[1] 李兴文[2] 魏建巍 张博雅 孙英杰 LÜJinzhuang;CHEN Bin;ZHANG Changhong;LI Mingyang;LI Weiguo;YANG Xu;LI Xingwen;WEI Jianwei;ZHANG Boya;SUN Yingjie(EHV Power Transmission Company,CSG,Guangzhou 510663,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;Henan PingGao Electric Co.,Ltd.,Pingdingshan,Henan 467001,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司,广州510663 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [3]河南平高电气股份有限公司,河南平顶山467001

出　　处：《南方电网技术》2023年第5期9-18,共10页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51825702);中国南方电网有限责任公司重大攻关项目(CGYKJXM20200356)。

摘　　要：直流高速开关(high speed switch,HSS)是多端直流输电系统中的关键设备。HSS的性能参数直接影响到多端直流系统的送电能力和运行灵活性。为了研制性能参数更优的±800 kV HSS产品,提出在长时直流耐受、直流小电流开断和直流燃弧耐受3大关键性能方面需解决的问题。结合内外绝缘仿真优化和样机绝缘验证,实现样机具备DC1224 kV/1 h湿耐受的绝缘性能;通过小电流开断的磁流体动力学仿真,获得了HSS开断小直流电流时灭弧室内部的温度、压力分布规律;试制了小直流开断实验样机,样机实验在1 kV恢复电压下最大开断电流达到350 A。通过长时燃弧的磁流体动力学仿真,获得了4000 A直流电流开断过程中灭弧室内部的温度、压力分布规律。该研究为性能参数更优的±800 kV HSS产品研制奠定坚实基础,对提高多端直流输电系统功率连续性和安全稳定运行具有重要意义。DC high speed switch(HSS)is the key equipment in multi-terminal DC transmission system.The power transmission capability and operation flexibility of multi-terminal DC system could be affected by the performance parameters of HSS.In order to develop±800 kV HSS products with better performance parameters,this paper proposes the problems to be solved in long term DC withstand performance,small DC current breaking and DC arc withstand performance.In this paper,the 1224 kV/1h wet withstand insulation capacity of the prototype is realized by combining the internal and external insulation simulation optimization and insula⁃tion verification of the prototype.Through the magnetohydrodynamic simulation of small current interruption,the temperature and pressure distribution in the arc extinguish chamber when HSS interrupts small DC current is obtained.A small DC breaking experimental prototype is trial produced,and the maximum breaking current of the prototype experiment reaches 350 A under 1 kV recovery voltage.Through the magnetohydrodynamic simulation of long duration arcing,the temperature and pressure distribution in the arc chamber during the 4000 A DC current breaking process are obtained.The research in this paper lays a solid foundation for the development of±800 kV HSS products with better performance parameters,and is of great significance for improving the power continuity and the safe and stable operation of multi-terminal DC transmission systems.

关 键 词：直流高速开关 绝缘性能 直流小电流开断 长时直流燃弧耐受 磁流体动力学仿真 

分 类 号：TM561[电气工程—电器]