| 特高压同杆双回线的环流不平衡及其影响 |
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| 引用本文： | 李斌,李学斌,丁茂生,薄志谦.特高压同杆双回线的环流不平衡及其影响[J].电工技术学报,2012(4):202-208,223. |
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| 作者姓名： | 李斌 李学斌 丁茂生 薄志谦 |
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| 作者单位： | 天津大学电力系统仿真控制教育部重点实验室;宁夏电力调度通信中心;英国ALSTOM输配电自动化公司 |
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| 基金项目： | 国家自然科学基金(50607014,50977061);博士点新教师基金(20100032120074)资助项目 |
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| 摘 要： | 同杆双回输电线路是特高压输电系统发展的必然趋势。分析了同杆双回线的导线排列形式及其阻抗矩阵的特点,在此基础上研究了同杆双回线电流的序分量,指出除穿越性不平衡电流之外,同杆双回线在正常运行或区外故障情况下可能出现明显的环流不平衡电流,且该环流不平衡受导线排列形式、区外故障类型等因素的影响。通过对特高压同杆双回线的仿真验证,定量分析得到环流不平衡度的大小,并阐述了环流不平衡电流对继电保护以及线路损耗的影响等。
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| 关 键 词： | 特高压 同杆双回线 不平衡电流 零序环流 继电保护 |
Circulating Unbalanced Current and Its Influence of Double-Circuit UHV Transmission Lines |
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| Li Bin,Li Xuebin,Ding Maosheng,Bo Zhiqian.Circulating Unbalanced Current and Its Influence of Double-Circuit UHV Transmission Lines[J].Transactions of China Electrotechnical Society,2012(4):202-208,223. |
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| Authors: | Li Bin Li Xuebin Ding Maosheng Bo Zhiqian |
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| Affiliation: | 1.Key Laboratory of Power System Simulation and Control of Ministry of Education, Tianjin University Tianjin 300072 China 2.Power Dispatch Center of Ningxia Antonomous Region Yinchuan 750001 China 3.ALSTOM T &D Stafford ST17 4LX UK) |
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| Abstract: | Double-circuit transmission line is a trend for development of ultra high voltage(UHV) transmission system.The paper analyzes the wire layout of double-circuit line and characteristics of its impedance matrix.And then the sequence currents of double-circuit line are investigated.The paper points out that besides through unbalanced current,there are distinct circulating current when double-circuit line is in normal operation or external fault occurs.Furthermore,the circulating current is influenced by wire layout and external fault.Based on the simulation and verification of UHV double-circuit transmission line,the paper calculates the circulating unbalanced degree and investigates the influence of circulating unbalanced current on protection relaying and line losses. |
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| Keywords: | Ultra high voltage(UHV) double-circuit transmission line unbalanced current zero-sequence circulating current relay protection |
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