Analysis About the Effect of Dielectric Film Surface Residual Charge on Vibration of Filter Capacitor Core

doi:10.11930/j.issn.1004-9649.202004193

Abstract

Abstract: The noise of filter power capacitor in high voltage direct current (HVDC) converters is becoming increasingly prominent. Thus, the vibration mechanism of capacitor should be further investigated to provide theoretical reference for noise reduction measures. In this regard, two main goals are to study the residual charge density on the surface of dielectric film inside the capacitor and its effect on the vibration of the capacitor core. Therefore, the residual charge density is measured by means of electrostatic probe and charge inversion, and the probability statistical law of the electric force of electrode plate with the residual charge distributing randomly is calculated and analyzed. Finally, the vibration acceleration of capacitor is obtained through Electric Field-Mechanical Force-Vibration coupling simulation and the results are validated by experiment. The results indicate that the residual charge density of films mainly distributes between ?10^?4 and 10^?4C/m². When a single-frequency excitation is applied, the force and vibration spectrum contains not only the double-frequency component but also the base-frequency component, which aggravates the imbalance of force on internal electrode plate.

Key words: filter capacitor, residual charge, stochastic, vibration, noise

WANG Shuai, LI Lin, CUI Jianye, ZHAO Shousheng, ZHANG Pengning, WANG Yaqi, HE Qiang. Analysis About the Effect of Dielectric Film Surface Residual Charge on Vibration of Filter Capacitor Core[J]. Electric Power, 2022, 55(2): 98-107,151.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202004193

https://www.electricpower.com.cn/EN/Y2022/V55/I2/98

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