高压直流输电入地电流在交流电网分布的仿真分析

PAN Zhuohong; ZHANG Lu; TAN Bo; MEI Guihua; WEN Xishan

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高压直流输电入地电流在交流电网分布的仿真分析

更新时间：2025-08-13

- 高压直流输电入地电流在交流电网分布的仿真分析
- Automation of Electric Power Systems Vol. 35, Issue 21, Pages: 110-115(2011)
- 作者机构：
  
  1. 武汉大学电气工程学院,湖北省,武汉市,430072
  2. 广东电网公司电力科学研究院,广东省,广州市,510600
- 作者简介：
- 基金信息：
- DOI：
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- Published：2011
- 稿件说明：
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PAN Zhuohong, ZHANG Lu, TAN Bo, et al. [J]. Automation of electric power systems, 2011, 35(21): 110-115.
DOI：

PAN Zhuohong, ZHANG Lu, TAN Bo, et al. [J]. Automation of electric power systems, 2011, 35(21): 110-115. DOI：

摘要

高压直流输电入地电流可能造成中性点接地运行变压器出现直流偏磁现象。借助潮流计算数据整理电网信息，再通过建立数学模型，可以有效地开展直流分布的计算机仿真工作。介绍了仿真软件在楚穗直流调试工况下预测和抑制广东电网直流分布的应用，最后通过随机算法产生的虚拟电网算例分析总结了电网参数对直流分布的影响:交流电网规模越大，变电站越密集，直流分布越严重;变压器和中性点小电抗准确阻值难以完全统计，仿真计算结果与实际值会存在一定偏差;接地运行的110 kV系统会影响220 kV网络的直流分布，但500 kV系统的直流分布则基本不变;采用中性点抑制措施后，电网局部直流分布会增加，但电网直流电流总量下降。

Abstract

DC bias of neutral-earthing transformers is caused by earth-return current of high voltage direct current（HVDC） transmission. Using the data of power flow calculations and by building the mathematical model， computer aided analysis of DC distribution can be carried out. This approach is introduced to obtain the DC distribution and DC restrain measure of Chu-Sui ultra HVDC transmission of Guangdong power grid. Through the study， the rules of DC distribution in some random virtual power grids can be obtained. It can be concluded that more DC distribution will be resulted with larger scale power grid and more geographically concentrated distribution substations. Errors between the calculation and realistic measurement are caused by the errors in resistances of transformer windings and neutral reactor. It is observed that DC distribution of 220 kV networks is affected by the neutral-earthing 110 kV networks， but this is not the case for 500 kV systems. Utilizing neutral braking measure will lead to increment of DC distribution in local power grid， but the total amount will be reduced.

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