Abstract
The HFO phenomena have been frequently reported in various VSC-HVDC projects, such as the 1.7kHz oscillation incident in France-Spain end-to-end VSC-HVDC project, the 1.2kHz oscillation incident in Luxi back-to-back VSC-HVDC project, the HFO range from 250Hz to 350Hz in Borwin1 VSC-HVDC project connecting to offshore wind farms, the 1.8kHz oscillation incident in YuE back-to-back VSC-HVDC project, the high frequency oscillation ranges from 750Hz to 4000Hz in Zhangbei VSC-HVDC grid project, the 2KHz and 2.5kHz oscillation incident in Rudong offshore VSC-HVDC system. These high frequency oscillation phenomena significantly disturb the normal operation of the power system. In order to reveal the mechanism of this type of high frequency oscillation, the process of the typical high frequency oscillation and their following suppression or optimization approaches used in the VSC-HVDC projects are presented. And then, the impedance model analysis and eigenvalue analysis approach regarding the high frequency oscillation are also demonstrated. The high frequency oscillation prevention and suppression approaches are categorized based on the active and passive aspects. The effectiveness of the active filter and the passive filter are also demonstrated. Finally, the difficulties and the future research perspective of the high frequency oscillation in VSC-HVDC system are discussed.
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