• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2013, Vol. 34 ›› Issue (9): 48-54.doi: 10.3969/j.issn.1000-7229.2013.09.010

• 输配电技术 • 上一篇    下一篇

±800  kV重庆特高压直流换流站操作过电压机理及仿真

傅玉洁1,沈扬1,丁健1,邓旭2   

  1. 1.浙江省电力设计院,杭州市 310012;2.浙江大学电气工程学院,杭州市 310027
  • 出版日期:2013-09-01
  • 作者简介:傅玉洁(1979),女,本科,工程师,主要从事变电站设计方面的工作,E-mail:ashinezju@163.com; 沈扬(1978),男,硕士,高级工程师,主要从事变电站和换流站等方面的设计工作; 丁健(1971),男,硕士,高级工程师,主要从事变电站设计工作; 邓旭(1990),男,硕士研究生,主要从事特高压直流换流站的过电压与绝缘配合等方面的研究工作。

Switching Overvoltage Mechanism and Simulation of±800 kV Chongqing UHVDC Converter Station

FU YuJie1, SHEN Yang1, DING Jian1, DENG Xu2   

  1. 1. Zhejiang Electric Power Design Institute, Hangzhou 310012, China; 2. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
  • Online:2013-09-01

摘要:

特高压直流换流站的过电压水平直接关系到换流站设备的绝缘配合和系统安全可靠运行。哈密北—重庆±800 kV特高压直流输电工程比我国已有的向上、云广和锦屏—苏南特高压直流工程的输送容量更大、送电距离更远,换流站的设备也有所不同,换流站的过电压水平将更加严重。为此,针对哈密北—重庆±800 kV特高压直流输电工程,详细分析特高压换流站交流场、阀厅和直流场的操作过电压机理,得到了重庆换流站各避雷器的决定性故障工况,并仿真计算了典型故障工况下换流站关键设备的过电压水平。计算结果表明:换流站交流母线的最大过电压达762 kV,换流阀两端承受的最大过电压为369  kV,直流极线平波电抗器线路侧和阀侧的最大过电压分别为1 298 kV和1 294 kV,中性母线平抗阀侧的最大过电压为439 kV;逆变侧重庆换流站始终接地,避雷器EL和EM不会承受严重的操作过电压冲击。计算结果可为换流站设备的绝缘配合及相关设备的选型、设计和试验等提供重要技术依据。

关键词: ±800 kV, 特高压直流, 换流站, 过电压, 避雷器

Abstract:

 

The overvoltage level of (UHVDC) converter station is closed related with the insulation coordination of station equipments and the operating reliability of power system. The overvoltage level of converter station in ±800 kV UHVDC power transmission project from north of Hami to Chongqing may be more serious as its higher transmission capacity and longer transmission distance than those of other existing UHVDC projects: Xiangshang project, Yunguang project and Jinping-Sunan project, as well as different equipments in converter station. Based on this UHVDC power transmission project, some decisive faults of arresters in Chongqing converter station were obtained after analyzing the mechanism of switching overvoltage that occurred at the AC field, valve hall and DC field of UHV converter station, and then overvoltage levels for some important equipments were calculated under typical fault conditions. The results show that, the maximum overvoltage for AC bus can be up to 762 kV, and 369 kV for converter valve, the overvoltage for equipments at the line side and valve side of the DC smoothing reactor are 1 298 kV and 1 294 kV, respectively, and the overvoltage for equipments at the valve side of the neutral smoothing reactor is 439 kV; because Chongqing converter station is the inverter station, arrester EL and EM don't need to bear significant switching stresses as the inverter station is always grounded. The calculation results can provide technical basis for the insulation coordination of the station equipments and their type selection, design and test as well.

Key words: ±800 kV, UHVDC, converter station, overvoltage, arrester