交直流并行架设下的负极性电晕电流脉冲特性  

Characteristics of Negative Corona Current Pulses from DC Conductor Parallel with AC Conductor

作　　者：程金金 李学宝[2] 张静岚 李隐飞 刘元庆 CHENG Jinjin;LI Xuebao;ZHANG Jinglan;LI Yinfei;LIU Yuanqing(Hubei Provincial Engineering Technology Research Center for Power Transmission Line(China Three Gorges University),Yichang 443002,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;Electric Power Research Institute of State Grid Jibei Electric Power Company Limited,Beijing 100045,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]湖北省输电线路工程技术研究中心(三峡大学),宜昌443002 [2]华北电力大学新能源电力系统国家重点实验室,北京102206 [3]国网冀北电力有限公司电力科学研究院,北京100045 [4]中国电力科学研究院有限公司,北京100192

出　　处：《高电压技术》2020年第9期3343-3351,共9页High Voltage Engineering

基　　金：国家自然科学基金(51707066)。

摘　　要：与单独直流导线相比,交直流导线并行架设的结构下直流导线电晕放电的规律有明显区别。通过实验室搭建的交直流导线并行架设的实验平台,测量了不同交流电压以及不同接近距离条件下负极性电晕电流脉冲的分布特性,分析获得了不同交流电压以及不同接近距离条件下负极性电晕电流脉冲幅值、上升时间、脉冲宽度以及重复频率等脉冲参数的统计特性。结果表明:负极性电晕电流脉冲的幅值随交流电压的升高而增大,电流脉冲的上升时间以及脉冲宽度基本不随交流电压的升高而变化,在交流电压的正半周,脉冲重复频率随着交流电压显著增加,而在负半周随着交流电压的增加显著减小。随着交直流并行导线接近距离的增大,交流电压对直流电晕放电特性的影响会逐渐降低。此外,通过有限元-有限体积方法计算了实验结构下空间电荷以及空间电场的分布特性,结合空间电荷及空间电场分布特性,对交流电压对负极性电晕电流脉冲的影响机制进行了解释。Compared with a single DC conductor,the corona characteristics of DC conductor under the structure of hybrid AC/DC conductors is obviously different.In this paper,the distribution characteristics of negative corona current pulses under different AC voltages and approaching distances are measured.Besides,the statistical characteristics of pulse parameters,such as pulse amplitude,rise time,pulse width,and repetition frequency are analyzed in detail.The results show that the pulse amplitude will increase with the increase of applied AC voltage,while the rise time and pulse width keep stable under different AC voltages.The pulse repetitive frequency will increase under the positive half cycle,but it will decrease under the negative half cycle.The influence of AC voltage on the negative corona discharge will decrease with the increase of the approaching distance.Furthermore,the distribution characteristics of space charge and space electric field are calculated by the hybrid finite element and finite volume method.Based on the calculated space charges and electric field,the influence mechanism of AC voltage on negative corona current pulses is analyzed essentially.

关 键 词：交直流并行 负极性电晕电流脉冲 脉冲波形参数 空间电荷 空间电场 

分 类 号：TM851[电气工程—高电压与绝缘技术]