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用于海上风电场并网的多模块变压器耦合型VSC - HVDC技术
王书征1, 郑良广2, 赵剑锋1
1.东南大学 电气工程学院,江苏 南京 210096;2.株洲南车时代电气股份有限公司 技术中心,湖南 株洲 412001
摘要:
给出了海上风电场并网系统结构,提出了一种新型的多模块变压器耦合型VSC-HVDC系统,各模块交流输入端通过多绕组变压器进行相互隔离,直流输出端由多个功率模块串联构成,通过灵活地增减模块数目,以获得不同的直流电压,各功率模块可以独立控制;建立了VSC-HVDC在两相同步旋转坐标系下的数学模型;研究了VSC-HVDC的基本控制策略,即并网侧换流站的定直流电压和定交流电压控制,风场侧换流站的定有功功率和定交流电压控制; 建立了基于定桨距恒速风力发电机系统的海上风电场直流并网仿真模型,并对风电场几种典型运行情况的并网性能进行了仿真分析。仿真结果表明,在海上风电场并网中采用VSC-HVDC技术能够很好地抑制交流电压波动和跟踪海上风电场输出的有功功率,提高了海上风电场的并网性能。
关键词:  风电  换流器  柔性直流输电  高压直流输电  多模块变压器  控制
DOI:
分类号:
基金项目:“十一五”国家科技支撑计划重大项目(2007BAA12B03);江苏省科技支撑计划项目(BE2008072,BE2008123)
VSC-HVDC technology of multi-module transformer for grid-connection of offshore wind farm
WANG Shuzheng1, ZHENG Liangguang2, ZHAO Jianfeng1
1.Electrical Engineering School,Southeast University,Nanjing 210096,China;2.Technology Center,Zhuzhou CSR Times Electric Co.,Ltd.,Zhuzhou 412001,China
Abstract:
The grid connection system for offshore wind farm is presented and a multi-module transformer-coupled VSC-HVDC system is introduced. The AC inputs of each power module are isolated from each other by a multi-winding transformer. The DC output side consists of multiple power modules connecting in series. Different DC voltage is obtained by changing the number of modules in series. Each power module is controlled independently. The mathematical model of VSC-HVDC system in dq synchronous rotating coordinates is presented. The basic control strategy of VSC-HVDC is studied: the constant DC and AC voltage control of grid-side converter and the constant active power and AC voltage control of wind farm converter. The simulation model for the grid connection of offshore wind farm via VSC-HVDC based on the fixed pitch constant speed wind power generation system is established. The grid-connection performance is analyzed by simulation under several typical operating conditions,which shows that,the VSC-HVDC technology applied in offshore wind farm enhances its grid connection performance in AC voltage fluctuation suppression and active power output tracking.
Key words:  wind power  electric converters  VSC-HVDC  HVDC power transmission  multi-module transformer  control

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