Influence of Inhomogeneous Residual Charges on the Stress of Filter Capacitor Components

In recent years, the serious vibration and noise problem of high voltage filter capacitor has become the primary problem of noise reduction in high voltage direct current (HVDC) converter station. The current research mainly focuses on the experimental measurement of the vibration and noise of the filter capacitor, without considering the influence of the residual charge on the dielectric interface stress. In this paper, the experimental platform is built for measuring the residual charge of the dielectric film in filter capacitor component, and the measurement results show that there are non-uniform residual charges on the dielectric surface of filter capacitor. In order to study the influence of uneven distribution of charge on dielectric interface stress, 12 different residual charge distributions are designed, and the results show that the uneven distribution of surface residual charge has a great influence on dielectric interface stress, and the higher uneven distribution of residual charge can cause the larger the stress on the dielectric surface of filter capacitor. The negative residual charge can lead to larger dielectric interface stress, which has a more serious impact on the vibration of filter capacitor component.