摘要
为解决传统直流输电系统逆变侧容易出现换相失败的问题,针对目前基于模块化多电平换流器(MMC)的直流输电系统造价较高、半桥结构子模块无法穿越直流故障、损耗大等缺点,本文提出了一种整流侧采用电网换相换流器(LCC)、逆变侧采用脉宽调制型电流源换流器(PWM-CSC)的混合直流输电系统。推导了系统的数学模型并分析了PWM-CSC交流输出侧的谐波特性,提出了一种最大功率因数控制策略。在PSCAD/EMTDC中搭建的基于PWM-CSC的混合直流输电系统的仿真结果表明,本文提出的控制策略能够在正常工况下实现系统逆变侧换流器最大功率因数运行;当交、直流侧发生短路故障时,本文提出的混合型直流输电换流器能够实现平稳穿越。
In view of the high cost and high loss of modular multilevel converter(MMC)based HVDC transmission system,a hybrid HVDC transmission system adopting line commutated converter(LCC)on the rectifier side and pulse width modulation current source converter(PWM-CSC)on the inverter side is investigated.The mathematical model and current harmonic characteristics of the PWM-CSC are analysed in detail.A maximum power-factor control method is proposed.The simulation results on the hybrid HVDC transmission system built on PSCAD/EMTDC verify that the proposed control method realizes the maximum power-factor operation under normal situation and that the hybrid HVDC transmission system can ride through both the AC grid fault and DC short fault smoothly.
作者
夏冰
李耀华
李子欣
马逊
王平
XIA Bing;LI Yao-hua;LI Zi-xin;MA Xun;WANG Ping(Key Laboratory of Power Electronics and Electric Drive,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《电工电能新技术》
CSCD
北大核心
2018年第7期17-24,共8页
Advanced Technology of Electrical Engineering and Energy
基金
国家高技术研究发展计划(863计划)项目(2015AA050102)。
关键词
混合直流输电系统
数学模型
电流源换流器
最大功率因数控制
交流电网故障穿越
直流短路故障穿越
hybrid HVDC transmission system
mathematical model
current source converter
maximum power-factor control
AC grid fault ride through
DC short fault ride through
