柔性直流电网结构对单极接地故障过电压的影响

doi:10.11930/j.issn.1004-9649.202009036

摘要/Abstract

摘要： 柔性直流电网的优势之一是其运行方式灵活可变，考虑到未来在检修等工况下系统可能采取不同的电网结构继续运行，而对于采用架空线的柔性直流电网，直流线路极易发生单极接地故障，因此有必要对不同电网结构下直流线路单极接地故障的过电压水平进行研究。搭建了基于环型四端柔性直流工程的过电压仿真模型，研究了柔性直流电网直流侧接地故障下的暂态过电压特性，计算分析了直流线路发生单极接地故障时，4种柔性直流电网结构下换流站内、外关键节点和设备上的过电压水平。研究表明，伪U型结构下系统的过电压水平相对较低，折线型和真U型电网结构下系统的过电压水平相对较高。不同电网结构对换流变压器阀侧对地电压和换流站母线过电压的影响规律相似。

关键词: 柔性直流电网, 直流电网结构, 单极接地故障, 过电压, 架空线

Abstract: Flexible operation mode is one of the VSC-HVDC system’s advantages, and the power system may continue to operate in the future with different grid structures under maintenance and other working conditions. However, for the VSC-HVDC system with overhead transmission lines, the DC lines are prone to single-pole grounding fault. Therefore, it is necessary to study the overvoltage of the DC lines with single-pole grounding fault for different grid structures. In this paper, a VSC-HVDC overvoltage model is built based on the ring-type four-terminal DC grid project, and the transient overvoltage characteristics of the VSC-HVDC system with the DC-side grounding fault are studied. The overvoltage levels of key nodes and equipment inside and outside the converter station are analyzed for four different VSC-HVDC grid structures with single-pole grounding fault occurring in the DC line. The results show that the system has a relatively low overvoltage level for the pseudo-U shaped structure, but has a relatively high overvoltage level for the broken-line shaped and real-U shaped structures. The system structures have the similar impact tendencies on the voltage to ground at the valve-side of converter transformer and on the overvoltage of the converter station bus.

Key words: VSC-HVDC, structure of DC grid, single-pole grounding fault, overvoltage, overhead transmission lines

吴嘉玲, 卢铁兵. 柔性直流电网结构对单极接地故障过电压的影响[J]. 中国电力, 2021, 54(10): 20-27.

WU Jialing, LU Tiebing. Influence of the VSC-HVDC System Structure on the Overvoltage of Single-Pole Grounding Fault[J]. Electric Power, 2021, 54(10): 20-27.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202009036

https://www.electricpower.com.cn/CN/Y2021/V54/I10/20

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