摘要
通过柔性直流技术将多个交直流系统互联形成多端直流系统,是未来电网的重要形态之一。不同电压等级的直流系统可以通过双有源桥式DC-DC变换器接入直流母线。文章建立了含双有源桥式DC-DC变换器的多端直流系统的戴维南等效电路及其状态空间小信号模型,提出了适用于多端直流系统的阻抗匹配稳定性分析方法;分析研究了静态工作点、传输线长度、直流电容大小等参数变化对系统稳定性的影响,进一步利用奈奎斯特稳定判据确定系统的稳定边界;并搭建了多端直流系统的仿真模型,通过仿真分析对所提出的稳定性分析方法和结论相应进行了验证。
The multi-terminal DC system comprised of multiple AC/DC systems by flexible DC technology is one of the important forms of future power grid.Dual active bridge DC-DC converters can connect several DC networks with different voltage levels.Here,the Davenan equivalent circuit and its state space small signal model of multi-terminal DC system with dual active bridge DC-DC converter are established.An impedance-based stability analysis method is proposed.The influences of parameters such as static operating point,line length and DC capacity on the stability are analyzed.The stability boundary is determined by using Nyquist criterion.The simulation model of the multi-terminal DC system is built and the proposed stability analysis method and conclusions are verified.
作者
刘垚
孔力
邓卫
裴玮
LIU Yao;KONG Li;DENG Wei;PEI Wei(Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,China)
出处
《电工电能新技术》
CSCD
北大核心
2020年第10期10-19,共10页
Advanced Technology of Electrical Engineering and Energy
基金
中国科学院前沿重点项目(QYZDY-SSW-JSC025)
中国科学院先导A项目(XDA21050000)。
