Vibration Velocity Distribution Characteristic of AC Filter Capacitor in HVDC System

Vibration of AC filter capacitor generates loud noises in HVDC converter stations, which would reach 105dB. Although there were several studies about the vibration and noise of the capacitors, no quantitative data of vibration velocity was measured. The objective of this work was to measure vibration velocity distribution on AC filter capacitor surfaces and to investigate relationship of vibrations between different points. In single-frequency experiments, the capacitor was applied with 550Hz 65.2A current. And in multi-frequency experiments, 50Hz 50A and 550Hz 35.5A currents were on the capacitor at the same time. A portable digital vibrometer was conducted to measure the vibration velocity on every capacitor surface. In order to obtain velocity data simultaneously, voltage squared was…