On Investigating the Effect of DC Biased Ripple Voltages over the Insulation of Bus Capacitor of Power Inverters

Possibility and Limitations

authored by

Reza Sargazi, Peter Werle, Asghar Akbari, Andreas Apelsmeier

Abstract

With growing advances in semiconductor technologies and the introduction of new topologies in power networks, the implementation of power converters has dramatically increased. Such variations may impose additional electrical stresses and lead to failures in insulation systems. In this regard, understanding the behavior of insulation is of paramount importance. Conventionally, spectroscopy of insulations is performed under sinusoidal voltage waveforms, while there are certain conditions where the insulation is subjected to a non-sinusoidal voltage waveform with a possible DC bias. A good example of this situation could be the bus capacitor of power converters, where the capacitor on the DC voltage side provides a low-impedance loop for current ripple originating from the converter topology or load behavior. In this paper, the complex permittivity of the insulation was extracted under DC-biased sinusoidal and non-sinusoidal voltage waveforms. The challenges associated with such measurements have been addressed, and finally, the results over a typical sample are presented and discussed.

Organisation(s)

High Voltage Engineering and Asset Management Section (Schering Institute)

External Organisation(s)

K.N. Toosi University of Technology
Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU Erlangen-Nürnberg)

Type

Article

Journal

IEEE Transactions on Dielectrics and Electrical Insulation

Volume

31

Pages

997-1002

No. of pages

6

ISSN

1070-9878

Publication date

04.2024

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electrical and Electronic Engineering

Electronic version(s)

https://doi.org/10.1109/TDEI.2024.3350548 (Access: Closed)