Study of the simple formula of DC surface potential in AC-DC interconnected large power system

被引：0
|
作者：
Ren, Zhichao [1 ]
Xu, Jianguo [1 ,2 ]
Zhang, Yikun [1 ]
Zhen, Wei [3 ]
Wu, Guangning [1 ]
机构：
[1] Southwest Jiaotong University, Chengdu 610031, China
[2] Shanxi Electric Power Research Institute, Taiyuan 030001, China
[3] Sichuan Electric Power Research Institute, Chengdu 610072, China
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2011年 / 26卷 / 07期
关键词：
Grounding electrodes - Electric grounding - Bias voltage - HVDC power transmission - Voltage distribution measurement - DC transformers;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
DC magnetic bias, caused by the current from the DC grounding electrode, threatens the safety of AC grid. At first, a simple and easy-to-use formula for calculating the DC surface potential was presented, which was based on typical three-layer soil structure. Secondly, in the verification, measured value of DC current of transformer neutral point was applied to decide the coefficient of the formula by editing nodal equation. Comparison of the calculated, simulation and measured value demonstrates high accuracy of the formula. Finally, DC current distribution in substations caused by DC grounding electrode was evaluated by predicting DC surface potential and step voltage in a HVDC with the formula mentioned above. Several substations were pointed out to take protective measures.
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页码：256 / 263
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