混合级联高压直流输电系统受端典型交直流故障特性分析  

Analysis of typical alternating current/direct current fault characteristics at the receiving end of hybrid cascaded high voltage direct current system

作　　者：杨大业 孙圣亚 孙媛媛[2] 王姗姗 赵兵 尹睿 孙凯祺[2] 田春义 YANG Daye;SUN Shengya;SUN Yuanyuan;WANG Shanshan;ZHAO Bing;YIN Rui;SUN Kaiqi;TIAN Chunyi(China Electric Power Research Institute,Beijing 100192,China;School of Electrical Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]山东大学电气工程学院,山东济南250061

出　　处：《山东大学学报（工学版）》2023年第6期131-142,151,共13页Journal of Shandong University（Engineering Science）

基　　金：柔直大扰动稳定域拓宽方法探索(XTB51202202118)。

摘　　要：以白鹤滩-江苏特高压混合级联直流输电工程为例,从理论和仿真两方面分析混合级联直流输电系统受端典型交直流故障对其稳定运行的影响。针对受端直流故障,分析直流线路接地故障及不同工况下,多组并联的模块化多电平换流器(modular multileve converter, MMC)闭锁故障后关键电气量的响应过程及暂态故障特性,并给出故障穿越方法。针对受端交流故障,分析受端电网换相换流器(line commutated converter, LCC)交流母线三相短路故障后LCC换相失败的故障特性,研究并联MMC运行方式对LCC换相能力的影响。为混合级联直流电网的安全稳定运行提供理论基础与技术支撑。This study took the Baihetan-Jiangsu hybrid cascaded ultra high voltage direct current(UHVDC)system as an example and analyzed the impact of typical alternating current direct current(AC-DC)faults at the receiving end of the hybrid cascade high voltage direct current(HVDC)system on its stable operation from both theoretical and simulation aspects.For DC faults at the receiving end,the response process and transient fault characteristics of key electrical quantities after grounding faults and modular multilevel converter(MMC)blocking faults in DC lines under different operating conditions were analyzed,and a fault traversal method was given.For the receiving AC fault,the fault characteristics of(line commutated converter)LCC commutation failure after a three-phase short-circuit fault on the receiving LCC AC bus were analyzed,and the influence of the parallel MMC operation mode on the LCC commutation capability was studied.The study provided a theoretical basis and technical support for the safe and stable operation of hybrid cascaded DC networks.

关 键 词：混合级联直流输电系统 暂态不平衡能量 暂态特性 故障穿越方法 换相失败 

分 类 号：TM732[电气工程—电力系统及自动化]