电工技术学报  2016, Vol. 31 Issue (5): 44-51    DOI:
电力电子与电力传动 |
提高VSC-HVDC系统供电无源网络的传输容量的控制方法
唐欣,张凯峰,许强,陈胜,谭威
长沙理工大学电气与信息工程学院 长沙 41000
Control Strategy for Enlarging the Transmission Capacity of VSC-HVDC Systems Supplying Passive Networks
Tang Xin,Zhang Kaifeng,Xu Qiang,Chen Sheng,Tan Wei
College of Electrical and Information Engineering Changsha University of Science and Technology Changsha 410000 China
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摘要 根据电压源换流器的高压直流输电(VSC-HVDC)系统整流站和逆变站的外部伏安特性,建立VSC-HVDC系统的直流网络等效电路,进而推导出VSC-HVDC系统的小信号模型,通过小信号稳定性分析,获得了VSC-HVDC供电无源网络的传输容量与直流电压、直流侧电容和线路参数之间的关系。并在整流站引入前馈控制以等效增大线路电阻,从而提高系统传输容量。最后,利用PSCAD/EMTDC软件进行了仿真验证,仿真结果表明,在基于电压源换流器的高压直流输电中,直流电压、直流电容值及直流输电线路的阻抗均会对VSC-HVDC供电无源网络的传输容量产生影响,通过引入前馈控制可大幅提高系统的传输容量。
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唐欣
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关键词 柔性直流输电小信号稳定性传输容量前馈控制虚拟电阻    
Abstract:The external Volt-Ampere characteristics of the rectifier and inverter station of the voltage sourced converter high voltage direct current (VSC-HVDC) system is simplified.The DC network equivalent circuit and the small signal model of the VSC-HVDC system are proposed respectively.The transmission capacity is calculated under small-signal stability constraints and three influence factors,i.e.DC voltage,DC-side capacitance,and line parameters,are also obtained.In addition,to equaviently increase the line resistance,a feed-forward control is introduced in the rectifier in order to further enhance the transmission capacity.Simulation is conducted with the PSCAD/EMTDC software.The simulation results demonstrate that the transmission capacity of the VSC-HVDC system supplying a passive network is remarkablely affected by the DC voltage,the DC-side capacitance,and the resistance and reactance of the DC transmission lines;and the feed-forward control introduced in the rectifier station can greatly enhance the transmission capacity of the system.
Key wordsVoltage-sourced converter-high voltage direct current    small-signal stability    transmission capacitor    feed-forward control    virtual resistor   
收稿日期: 2015-02-02      出版日期: 2016-03-16
PACS: TM216  
基金资助:国家自然科学基金(51577014)和湖南省研究生创新项目(CX2015B362)资助。
通讯作者: 唐 欣,男,1975年生,博士,教授,研究方向为电力电子在电力系统中的应用。E-mail:tangxin_csu@163.com     E-mail: 1527657132@qq.com
作者简介: 张凯峰 男,1992年生,硕士研究生,研究方向为电力电子在电力系统中的应用。
引用本文:   
唐欣,张凯峰,许强,陈胜,谭威. 提高VSC-HVDC系统供电无源网络的传输容量的控制方法[J]. 电工技术学报, 2016, 31(5): 44-51. Tang Xin,Zhang Kaifeng,Xu Qiang,Chen Sheng,Tan Wei. Control Strategy for Enlarging the Transmission Capacity of VSC-HVDC Systems Supplying Passive Networks. Transactions of China Electrotechnical Society, 2016, 31(5): 44-51.
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