Phase Offset Characteristics of Commutation Voltage for HVDC with Single-phase Grounding Fault

Menghua HUANG; Chuang FU; Juanjuan WANG; Jian YANG; Huan LI; Zhaoxin WEN

doi:10.7500/AEPS20191021009

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Phase Offset Characteristics of Commutation Voltage for HVDC with Single-phase Grounding Fault

Application Research | 更新时间：2025-06-16

- Phase Offset Characteristics of Commutation Voltage for HVDC with Single-phase Grounding Fault
- Automation of Electric Power Systems Vol. 44, Issue 12, Pages: 162-168(2020)
- 作者机构：
  
  1. 广东电科院能源技术有限责任公司，广东省广州市 510080
  2. 直流输电技术国家重点实验室，南方电网科学研究院有限责任公司,广东省广州市 510663
  3. 华南理工大学电力学院，广东省广州市 510641
- 作者简介：
- 基金信息：
  
  Abstract:
  In order to solve the bipolar commissioning problem of high voltage direct current (HVDC) transmission projects while the construction of conventional earth electrodes are not completed, the unconventional earth electrode operation schemes, including in-station deep electrodes and out-station simple electrodes, are introduced. Then the electrical performance of electrodes, human safety, electrode heating, DC bias of transformers and diverting potential are studied. The main conclusions are as follows: in-station deep electrode schemes are technically feasible, but isolating measures should be taken to avoid high induced DC potential of earthing grid endangering the safety of equipment and human, for out-station simple electrode schemes, the step voltage and electrode temperature rise requirements are difficult to meet in monopole operation mode. So unbalanced current control measures should be introduced to ensure the safety of equipment and human near electrodes.
  Foundation:This work is supported by National Natural Science Foundation of China;National Natural Science Foundation of China-State Grid Corporation of China Joint Fund Project;State Key Laboratory Project of China Southern Power Grid
- DOI：10.7500/AEPS20191021009
  CLC：
- Received：21 October 2019，
  
  Revised：2020-02-25，
  
  Published Online：04 June 2020，
  
  Published：25 June 2020
- 稿件说明：
移动端阅览
黄梦华,傅闯,汪娟娟等.单相接地时高压直流换相电压相位偏移量特性[J].电力系统自动化,2020,44(12):162-168.

HUANG Menghua,FU Chuang,WANG Juanjuan,et al.Phase Offset Characteristics of Commutation Voltage for HVDC with Single-phase Grounding Fault[J].Automation of Electric Power Systems,2020,44(12):162-168.
黄梦华,傅闯,汪娟娟等.单相接地时高压直流换相电压相位偏移量特性[J].电力系统自动化,2020,44(12):162-168. DOI： 10.7500/AEPS20191021009.

HUANG Menghua,FU Chuang,WANG Juanjuan,et al.Phase Offset Characteristics of Commutation Voltage for HVDC with Single-phase Grounding Fault[J].Automation of Electric Power Systems,2020,44(12):162-168. DOI： 10.7500/AEPS20191021009.

摘要

高压直流输电系统逆变侧不对称故障会造成换流阀换相电压相位发生偏移，进而引起换相失败的发生，严重影响了系统的稳定运行。为此，对不对称故障下的换相电压偏移量特性进行研究，基于电力系统暂态分析方法，对不对称故障下高压直流输电系统进行正负零序分解，推导出YNy0接线和YNd1接线换流变压器阀侧三相电压幅值、相位的计算公式，得到不对称故障下12脉动换流阀换相电压的最大偏移量，并对换流变网侧交流母线线电压幅值进行计算，通过MATLAB解析计算分析不同类型故障接地阻抗下，换流阀换相电压偏移量的变化特性。PSCAD/EMTDC电磁暂态仿真结果证明了文中所分析换相电压偏移量影响特性的正确性。

Abstract

Asymmetrical faults on the inverter side of the high voltage direct current (HVDC) transmission system will lead to the phase offset of commutation voltage of converter valve

which will cause commutation failures and seriously affect the stable operation of the system. So it is necessary to study the phase offset characteristics of commutation voltage under asymmetric faults. Based on the transient analysis method of the power system

the positive-

negative- and zero-sequence decompositions of the HVDC transmission system under asymmetric faults are carried out

and the calculation formulas for the amplitude and phase of the three-phase voltage on the valve side of the converter transformers for YNy0 and YNd1 wiring are derived

and the maximum deviation of the commutation voltage of the 12-pulsation converter valve under an asymmetric fault is obtained. In addition

the amplitude of the AC bus voltage on the grid side of the converter is calculated

based on MATLAB simulation software

the characteristic variation of commutation voltage offset of converter valve with different types of ground fault impedance are analyzed. The PSCAD/EMTDC electromagnetic transient simulation results prove the correctness of the influence characteristics of commutation voltage offset analyzed in this paper.

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references

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