DC bias analysis and suppression of transformers in henan power grid after tianshan-zhongzhou UHVDC transmission project commissioning

被引：0

作者：

Dong M. ^{[1
]}

Yao S. ^{[2
]}

Guo L. ^{[1
]}

Ding G. ^{[1
]}

Kou X. ^{[1
]}

Zhang K. ^{[1
]}

机构：

[1] State Grid Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology, Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou

[2] Yellow River Engineering Consulting Co., Ltd., Zhengzhou

来源：

Dong, Manling (dongmanling0211@163.com) | 2017年 / Science Press卷 / 43期

关键词：

Capacitive-type DC suppression device; Classified protection; DC bias; Reliable return system; Suppression measure; UHVDC;

D O I：

10.13336/j.1003-6520.hve.20170123035

中图分类号：

学科分类号：

摘要：

A large DC earth current will have a negative impact on Henan power grid, when ±800 kV Tianshan-Zhongzhou (Tianzhong) UHVDC transmission project operates in ground-return mode or asymmetric operation mode. Therefore, based on the practical operation of Henan power grid, a simulation model to analyze the DC bias was established. According to the measured results on site, the DC bias classification protection of Henan power grid was made. The capacitive-type DC suppression device with reliable return system was developed and operated in Henan power grid. The results show that the magnitude of the DC bias current is mainly affected by the surface potential rising distribution, also affected by the distance between the substations and the number of outlets. Special attention should be paid to the DC bias of the station which is far away from other station and have less outlets. The principle of classified protection is that the station of which DC bias exceeds the standard needs to be suppressed, and substation with significant DC bias needs to be further monitored. The capacitive-type DC suppression device which has a bypass protection will reliably operate when the control system is de-energized. When this capacitive-type DC suppression device is adopted in the 220 kV Minghe substation, the DC bias is effectively suppressed, and the safe and reliable operation of Henan power grid is ensured. Therefore, the influence of DC bias to the transformer of Henan power grid can be effectively solved after Tianzhong UHVDC transmission project commissioning. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：611 / 618

页数：7

共 23 条

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