摘要
柔性直流输电技术正逐步应用于电网500kV主网架中。电网对送电设备高可靠性的要求,使柔性直流与交流系统的交互影响受到更多的重视。分析了柔性直流接入极端交流系统的高频谐振、低频谐振两种典型振荡模式。分析了柔性直流与交流系统高频谐振机理,高频振荡对控制参数变化不敏感,与控制链路延时、前馈策略相关性高,提出了可行的高频谐振抑制策略。此外,给出了典型的低频振荡仿真案例,仿真验证了低频谐振与控制参数的敏感性。
The modular multilevel converter(MMC) based VSC-HVDC with high-capacity is applying to 500 k V main grid nowadays. Due to the high reliablity requirement of power grid, the interaction of VSC-HVDC and the grid is becoming more and more important. High-frequency and low-frequency resonance of VSC-HVDC with extreme AC grid were analyzed in this paper. The high-frequency resonance mechanism and its stability criterion were analyzed. The high-frequency resonance is sensitive to delay and feedforward control instead of current control, high-frequency suppression methods were provided.Furthermore, typical low-frequency resonance was presented,simulations show that low-frequency resonance was highly sensitive to controller parameters.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第S1期19-23,共5页
Proceedings of the CSEE
关键词
高频谐振
低频谐振
柔性直流
延时
high-frequency resonance
low-frequency resonance
VSC-HVDC
delay
