Study of DC-bias Current Distribution in AC Power System Based on Direct Field-circuit Coupled Model

被引：0
|
作者：
Ruan J. [1 ]
Xu W. [1 ]
Ding Z. [2 ]
Wu Y. [1 ]
Sun X. [3 ]
Zou G. [3 ]
机构：
[1] School of Electrical Engineering, Wuhan University, Wuhan
[2] State Grid Jiangsu Electric Power Company Economic Research Institute, Nanjing
[3] State Grid Zhejiang Electric Power Research Institute, Hangzhou
来源：
Xu, Wenjie (1789965541@qq.com) | 1600年 / Science Press卷 / 43期
关键词：
AC power system; Current distribution; DC magnetic bias; Field-circuit coupled model; Grounding electrode; HVDC transmission; Transformer;
D O I：
10.13336/j.1003-6520.hve.20170328034
中图分类号：
学科分类号：
摘要：
DC transmission system in monopole-grounded return operation mode may lead to DC magnetic bias of some transformers in AC power system. Based on the direct field-circuit coupled method, the DC magnetic bias calculation models of ±800 kV Xi-Zhe and ±800 kV Ling-Shao UHV transmission project were built. The modeling range and the ground grid parameters were determined, while the soil model was modified as well. The calculated values of DC biasing current were compared with the test results and the total relative average error of each testing station was no more than 5%, verifying the accuracy of the calculation model. The DC biasing current distribution regularities of the substations above 110 kV around the grounding electrode was calculated and analyzed further. The results indicate that the DC current of the substation decreases as the distance between the substation and the grounding electrode increases. When transformers are in parallel operation, the DC current of each transformer decreases greatly. The DC current flowing through the starting and terminal substations will increase with their distance. This research can provide reference to the calculation of DC current distribution in large AC grid and the management of DC magnetic bias. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：1333 / 1340
页数：7
相关论文
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