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考虑延时影响的MMC-HVDC系统高频振荡机理分析
作者:
作者单位:

1.华北电力大学电气与电子工程学院,北京市 102206;2.国网冀北电力有限公司电力科学研究院,北京市 100045;3.华北电力科学研究院有限责任公司,北京市 100045

摘要:

基于模块化多电平换流器的高压直流(MMC-HVDC)输电系统的链路延时可能会引发系统产生高频振荡。文中通过Pade近似对延时环节进行等值,建立了基于四阶Pade近似等值延时环节的MMC-HVDC系统的状态空间模型。通过在阶跃工况下与PSCAD/EMTDC中详细电磁暂态模型动态特性的对比以及高频振荡的复现,验证了所建立的状态空间模型的正确性及四阶Pade近似等值延时环节的有效性。然后,研究了延时环节时间常数对系统特征根及高频振荡特性的影响,结果表明,基于特征值分析法对所建立的考虑延时环节特性的MMC-HVDC系统状态空间模型进行分析,可以得到引发系统高频振荡的临界延时时间。最后,通过参与因子分析法探究了引起系统发生高频振荡的主要因素,结果表明,系统的高频振荡现象主要是由交流系统特性与含有延时环节的MMC-HVDC系统特性之间的耦合作用引起。

关键词:

基金项目:

国家电网有限公司科技项目(柔直电网模块化电压源换流阀高次谐波机理与抑制措施,5500-202014057A-0-0-00)。

通信作者:

作者简介:

郭春义(1984—),男,通信作者,博士,副教授,博士生导师,主要研究方向:直流输电、柔性交流输电系统等。E-mail:chunyiguo@outlook.com
彭意(1997—),女,硕士研究生,主要研究方向:直流输电等。E-mail:prudenceyi1026@163.com
徐李清(1998—),男,硕士研究生,主要研究方向:直流输电等。E-mail:xlqfamily0725@163.com


Analysis on High-frequency Oscillation Mechanism for MMC-HVDC System Considering Influence of Time Delay
Author:
Affiliation:

1.School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China;2.Electric Power Research Institute of State Grid Jibei Electric Power Co., Ltd., Beijing 100045, China;3.North China Electric Power Research Institute Co., Ltd., Beijing 100045, China

Abstract:

The circuit time delay of modular multilevel converter based high voltage direct current (MMC-HVDC) transmission systems may cause high-frequency oscillation of power systems. This paper establishes an equivalent model of the time-delay link based on the Pade approximation, and develops a state space model of MMC-HVDC system by equivalently representing the time-delay based on the fourth-order Pade approximation. By comparing the dynamic characteristics of the model with those of the detailed electromagnetic transient model in PSCAD/EMTDC under the step condition and the recurrence of high-frequency oscillation, the correctness of the developed state space model and the validity of the fourth-order Pade approximation for the time-delay equivalent are verified. Then, the influence of the time constant of the time-delay on the system eigenvalues and the high-frequency oscillation characteristics is studied. The results show that, based on the eigenvalue analysis method, the critical delay time that causes the system high-frequency oscillation can be obtained by analyzing the state space model of MMC-HVDC system considering the delay link characteristics. Finally, based on participation factor analysis method, the main factors that cause the system high-frequency oscillation are studied. The results show that the system high-frequency oscillation is mainly caused by the coupling between the characteristics of AC system and MMC-HVDC system with the time-delay link.

Keywords:

Foundation:
This work is supported by State Grid Corporation of China (High-order harmonic mechanism and suppression measures of modular voltage source converter valve in flexible DC power grid, No. 5500-202014057A-0-0-00).
引用本文
[1]郭春义,彭意,徐李清,等.考虑延时影响的MMC-HVDC系统高频振荡机理分析[J].电力系统自动化,2020,44(22):119-126. DOI:10.7500/AEPS20200509006.
GUO Chunyi, PENG Yi, XU Liqing, et al. Analysis on High-frequency Oscillation Mechanism for MMC-HVDC System Considering Influence of Time Delay[J]. Automation of Electric Power Systems, 2020, 44(22):119-126. DOI:10.7500/AEPS20200509006.
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  • 收稿日期:2020-05-09
  • 最后修改日期:2020-08-01
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  • 在线发布日期: 2020-11-18
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