海上风电直流汇集系统阻抗建模及振荡特性分析  

Impedance Modeling and Oscillation Characteristics Analysis of Offshore Wind Power DC Collection System

作　　者：李彧野 王伟胜 何国庆 LI Yuye;WANG Weisheng;HE Guoqing(National Key Laboratory of Renewable Energy Grid-integration(China Electric Power Research Institute),Haidian District,Beijing 100192,China)

机构地区：[1]可再生能源并网全国重点实验室(中国电力科学研究院有限公司),北京市海淀区100192

出　　处：《电网技术》2025年第4期1295-1304,I0001-I0008,共18页Power System Technology

基　　金：国家电网有限公司总部科技项目(4000-202255285A-2-0-QZ)。

摘　　要：海上风电直流汇集方式具有可避免交流电缆无功充电和过电压问题等优势,是未来主要发展方向之一。与柔性直流(modular multilevel converter based high voltage DC current,MMC-HVDC)不同,其通过直流变压器(DC transformer,DCT)低、高压端口实现海上风电发电侧与岸上MMC送出侧互联,系统的宽频振荡风险尚不明确,亟须开展阻抗建模及振荡特性分析。首先分别建立了计及岸上MMC对汇集端口耦合与海上风电对送出端口耦合的海上风电汇集系统阻抗模型;然后定量刻画了汇集和送出端口的小信号耦合通路,揭示了端口负阻尼特性主导影响因素,并分析了振荡风险;最后,基于Matlab/Simulink构建海上风电直流汇集系统电磁暂态仿真平台,仿真实验验证了汇集和送出端口振荡分析的准确性,发现耦合特性将影响海上风电直流汇集送出系统振荡分析结果。The offshore wind power DC collection and transmission method has the advantages of avoiding reactive power charging and overvoltage issues caused by AC cables and the like,which will be the main development technique in the future.Different from modular multilevel converter-based high voltage DC(MMC-HVDC),offshore wind power DC collection and transmission system connects the wind power and the onshore MMC by the low and high ports of DC transformer(DCT),the broadband oscillation of which is unclear.So,impedance modeling and oscillation analysis of offshore wind power DC collection and transmission systems are needed.In this paper,the impedance models of system collection and transmission port voltage ports were first established,considering the effects of the onshore MMC on the collection port and the offshore wind power on the transmission port.Then,the impedance small signal coupling pathway which were quantitatively characterized,the dominant influencing factors of the negative damping characteristics were revealed,and the oscillation risks were analyzed.Finally,

关 键 词：海上风电 直流变压器 宽频振荡 阻抗建模 振荡分析 

分 类 号：TM721[电气工程—电力系统及自动化]