Analysis Saturation Harmonic Instability of Converter Transformer

LIU Hongtao; ZHOU Jian; MEI Qi; MEI Yong; LIN Fuchang; LI Hua; MENG Jia; TU Jingyun

doi:10.13296/j.1001-1609.hva.2021.12.026

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Analysis Saturation Harmonic Instability of Converter Transformer

更新时间：2025-04-26

- Analysis Saturation Harmonic Instability of Converter Transformer
- High VoltageApparatus Vol. 57, Issue 12, Pages: 191-194+200(2021)
- 作者机构：
  
  1. 中国南方电网电力调度控制中心
  2. 华中科技大学电气与电子工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2021.12.026
  CLC： TM41;TM721.1
- Published：2021
- 稿件说明：
移动端阅览
LIU Hongtao, ZHOU Jian, MEI Qi, et al. Analysis Saturation Harmonic Instability of Converter Transformer[J]. High voltageapparatus, 2021, 57(12): 191-194+200.
DOI：

LIU Hongtao, ZHOU Jian, MEI Qi, et al. Analysis Saturation Harmonic Instability of Converter Transformer[J]. High voltageapparatus, 2021, 57(12): 191-194+200. DOI： 10.13296/j.1001-1609.hva.2021.12.026.

摘要

介绍了高压直流输电系统中2次谐波的传递过程

以及由此可能引发的谐波不稳定性。针对变压器绕组中存在的直流电流而导致的2次谐波电流进行了仿真分析研究

得出了励磁电流中2次谐波幅值与直流电流的关系。2次谐波幅值与直流电流的关系由线性系数X体现

从换流变压器阀侧看入交流系统侧的阻抗与变压器变比N以及线性系数X相关

Abstract

The transmission process of secondary harmonic in HVDC transmission system and harmonic instability caused by it are introduced. The secondary harmonic current due to DC current in the transformer winding is simulated

analyzed and studied. And the relationship between the secondary harmonic amplitude and DC current in the excitation current is obtained. The relationship between the secondary harmonic amplitude and DC current is revealed by the linear coefficient X. It is seen from the valve side of the converter transformer that the impedance of AC system side is correlated to the transformer ratio N and linear coefficient X. When the correlated coefficient is（1/N-3/2X）

the linear coefficient X and rated excitation current I

f transformer shows negative correlation. The result shows that when the rated excitation current I

0.089

at this time（1/N-3/2X ）

the harmonic instability may likely occur.

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