﻿ 抑制直流偏磁电阻的全网优化计算

# 抑制直流偏磁电阻的全网优化计算Global Network Optimized Resistance to Restrict Transformers Direct Current Magnetic Bias

Abstract:
When bipolar current of high voltage direct current transmission system operating asymmetrically or monopolar-ground return operating, huge direct current will pour into the ground through the earthing electrode and thus, transformers nearby will be influenced by direct current magnetic bias and add harm on alternating system. Installing resistance in serial of neutral grounding transformers is an effective method to restrict transformers direct current magnetic bias. The paper presents an optimized configuration method of ground resistance to make all the currents through the transformer neutral point in the grid within its limits on the basis of increment network sensitivity analysis. The proposed method is verified by the data from tian-guang HVDC, and the verification result shows that it is a simple and effective method of restricting all the neutral direct current magnetic bias by optimized resistance. The global network optimized resistance method can provide reference value for practical project.

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