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电压源型直流输电的动态相量建模与仿真
引用本文:姚伟,程时杰,文劲宇.电压源型直流输电的动态相量建模与仿真[J].高电压技术,2008,34(6):1115-1120.
作者姓名:姚伟  程时杰  文劲宇
作者单位:华中科技大学电力安全与高效湖北省重点实验室,武汉,430074
基金项目:国家重点基础研究发展计划(973计划)
摘    要:为适应电力系统快速精确仿真和分析控制的需要,采用了一种新的建模方法—基于时变傅立叶级数的动态相量法,对电压源型直流输电(VSC-HVDC)进行建模和仿真。该方法通过保留与系统状态变量相对应的时变傅立叶级数中的重要项对原系统进行简化,首先建立用开关函数描述的VSC-HVDC换流站详细时域模型,在此基础上,给出VSC-HVDC动态相量模型的详细推导过程。在对VSC-HVDC进行动态相量建模的过程中,换流站的开关函数考虑直流分量和基频分量,直流传输线路只考虑直流分量,从而大大简化高频开关过程,在保证仿真精度的同时,大大缩短了仿真时间。通过MATLAB仿真软件用动态相量模型与详细时域电磁暂态(EMT)模型分别对VSC-HVDC进行仿真比较的结果表明,动态相量模型精确而有效,不仅可以精确描述VSC-HVDC的暂态变化过程,而且可以大大节省仿真计算时间。

关 键 词:电力系统  电压源型直流输电  动态相量模型  时变傅立叶级数  开关函数  电磁暂态模型

Modeling and Simulation of VSC-HVDC with Dynamic Phasors
YAO Wei,CHENG Shi-jie,WEN Jin-yu.Modeling and Simulation of VSC-HVDC with Dynamic Phasors[J].High Voltage Engineering,2008,34(6):1115-1120.
Authors:YAO Wei  CHENG Shi-jie  WEN Jin-yu
Affiliation:(Electric Power Security and High Efficiency Lab,Huazhong University of Science and Technology,Wuhan 430074,China)
Abstract:To meet the needs of rapid accurate simulation and analysis of the power system,a newly developed method-dynamic phasors method is applied to a model voltage sources converter based HVDC(VSC-HVDC) transmission system.This method is based on the time-varying Fourier coefficients series of the system variables,and focuses on the dynamics behavior of the Fourier coefficients.By truncating unimportant higher order series and keep only those significant series,this method can catch the dynamic behavior of the original detail model.The complexity of dynamic phasors model can be adjusted according to different application requirements.Therefore,it can significantly improve computational efficiency and maintain a good engineering precision when it is used for transient simulation.Followed by the time-domain converter station model for VSC-HVDC described by switch function,detailed analysis of the VSC-HVDC dynamic phasors model is presented.The VSC-HVDC model is simplified by keeping important system state variables corresponding to the time-varying Fourier series,which include the converter station switching function considering both the DC component and basic frequency component,and the DC transmission line considering only the DC component.Therefore,high frequency switching process is greatly simplified.The dynamic phasors model and a detailed time domain electromagnetic transient(EMT) model for the VSC-HVDC are simulated by the MATLAB software,and simulation results show that this method can ensure simulation accuracy and reduce computational cost.
Keywords:power system  VSC-HVDC  dynamic phasors model  time-varying Fourier coefficients  switch function  electromagnetic transient model
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