特高压交直流混联条件下四川电网低频振荡模态分析

Analysis on Low-frequency Oscillation Mode of Sichuan Power Grid under UHV AC/DC Hybrid Transmission

以2017年"三华"电网模型为基础,研究了含特高压输电线路的四川电网内部的低频振荡模式。对目前已有低频振荡机理进行了总结。通过对不同典型运行方式的分析,指出了含特高压输电线路的四川电网存在的几种振荡模式,并论证了电力系统稳定器(PSS)对抑制该振荡频率的重要性;开展了时域、频域的对比分析及验证,提出时域仿真分析中进行参数辨识的典型经验。最后,对下一步开展低频振荡研究工作的重点和方向进行了展望。

Taking the project interconnecting North China Power Grid with Central China Power Grid and East China Grid as the research background, the low - frequency oscillation mode of Sichuan power grid containing UHV transmission lines is studied. With a review and summary of several mechanism of low - frequency oscillation, the main low - frequency oscillation modes in Sichuan power grid with UHV transmission lines are summarized based on the analysis of different typical operation modes, and the importance of power system stabilizer （PSS） to suppress the oscillation frequency is demonstrated. By verif- ying and analyzing the comparison of both time domain and frequency domain, the typical experiences of parameter identification in the time domain simulation analysis are proposed. Finally, the focus and direction for the future research of low - fre- quency oscillation are forecasted.