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CN 32-1180/TP

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考虑换流器内部故障的LCC-HVDC动态平均化建模方法
作者:
作者单位:

1. 北京交通大学电气工程学院, 北京市 100044; 2. 国网江苏省电力有限公司, 江苏省南京市 211100

摘要:

随着多个高压直流输电工程陆续投入运行,中国输电网呈现交直流混联的特征,其稳态与暂态特性区别于传统的交流互联电网。常规高压直流线路采用晶闸管换流器作为交流系统与直流系统的接口,换流器内部发生故障往往给系统的运行带来安全风险。研究高压直流换流器内部故障对电网运行的影响,需要建立准确高效的直流换流器暂态模型。基于分立开关的直流换流器详细模型在仿真过程中需处理大量开关动作事件,计算效率无法满足大规模交直流混联电力系统在线分析的需求。提出一种考虑内部故障的高压直流输电系统动态平均化模型,能够准确模拟由于直流换流器内部故障引起的暂态响应,且具有较高的计算效率,并以CIGRE标准直流输电系统为例验证了所提出模型的准确性与高效性。

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基金项目:

国家重点研发计划资助项目(2017YFB0902600);国家电网公司科技项目(SGJS0000DKJS1700840)

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作者简介:


Dynamic Average-value Modeling Method of LCC-HVDC System Considering Internal Fault of Converter
Author:
Affiliation:

1. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China;2. State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211100, China

Abstract:

With the implementation of multiple high voltage direct current(HVDC)transmission projects, the AC-DC hybrid characteristics of the transmission systems of China in steady and transient states become quite different from the traditional AC hybrid grids. Line-commutated converters(LCCs)are used by HVDC lines as the interfaces between the AC system and DC system. Internal faults inside the converters will pose threats to the operation of the power system. Accurate and efficient transient models of HVDC converters are essential for the analysis of influences of internal faults for HVDC converters on power system operation. The detailed model of HVDC converter based on discrete switches is not suitable for the requirements of on-line analysis for large-scale AC-DC hybrid power system due to the low efficiency in simulating large amount of switching events. This paper proposes a dynamic average-value model of the HVDC system considering the internal faults, which can simulate the transient response of internal faults for HVDC converters and has high computational efficiency. The proposed model is validated by the CIGRE benchmark HVDC system. The simulation results indicate the superiority on accuracy and efficiency.

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Foundation:
引用本文
[1]洪泽祺,许寅,和敬涵,等.考虑换流器内部故障的LCC-HVDC动态平均化建模方法[J].电力系统自动化,2019,43(22):84-93. DOI:10.7500/AEPS20190526001.
HONG Zeqi, XU Yin, HE Jinghan, et al. Dynamic Average-value Modeling Method of LCC-HVDC System Considering Internal Fault of Converter[J]. Automation of Electric Power Systems, 2019, 43(22):84-93. DOI:10.7500/AEPS20190526001.
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  • 收稿日期:2019-05-26
  • 最后修改日期:2019-09-30
  • 录用日期:2019-08-23
  • 在线发布日期: 2019-09-24
  • 出版日期: 2019-11-25
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