交流系统短路比和阻抗角对模块化多电平高压直流输电系统低频段振荡模态的影响
摘要：模块化多电平高压直流输电(modular multilevel converter based high voltage direct current, MMC-HVDC)在多种场景得到应用，围绕交流系统短路比和阻抗角对MMC-HVDC系统低频段振荡模态的影响展开研究，首先建立了两端MMC-HVDC的小干扰模型；然后研究了交流系统短路比和阻抗角对其小干扰稳定性的影响，探讨了弱交流系统和低阻抗角可能引发的MMC-HVDC系统在低频段的振荡现象；最后研究了低频段振荡模态的特征，并在此基础上研究了利用控制系统参数的调节方法来抑制可能出现的低频段振荡现象，以期为MMC-HVDC系统的工程运行提供一定的理论指导。
Abstract:Modular Multilevel Converter based High Voltage Direct Current (abbr. MMC-HVDC) had been applied in various occasions. The impact of AC system short-circuit ratio and impedance angle on low frequency oscillation mode in MMC-HVDC system was researched. Firstly, an interference model of two-terminal MMC-HVDC system was established. Secondly, the impact of AC system short-circuit ratio and impedance angle on its small interference stability was researched, and the low-frequency range oscillation in MMC-HVDC system that possibly caused by weak AC grid and low impedance angle was investigated. Finally, the characteristics of low-frequency range oscillation mode was discussed, and on this basis, a regulation method of utilizing parameters of control system to restrain the low-frequency range oscillation that might appear was researched in order to provide a certain theoretical guidance for the engineering operating of MMC-HVDC system.
标题：交流系统短路比和阻抗角对模块化多电平高压直流输电系统低频段振荡模态的影响
英文标题：Impact of AC System Short-Circuit Ratio and Impedance Angle on Low Frequency Oscillation Mode in MMC-HVDC System
