NDLI: Reduction of DC bus capacitor ripple current with PAM/PWM converter

Content Provider	IEEE Xplore Digital Library
Author	Kieferndorf, F.D. Forster, M. Lipo, T.A.
Copyright Year	2002
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA (Kieferndorf, F.D.; Forster, M.; Lipo, T.A.)
Abstract	Electrolytic capacitors are used in nearly all adjustable speed drives (ASD) and they are one of the components most prone to failure. The main failure mechanisms include the loss of electrolyte through outgassing and chemical changes to the oxide layer. All the degradation mechanisms are exacerbated by ripple current heating. Since the equivalent series resistance (ESR) of electrolytic capacitors is a very strong function of frequency, it must be properly modeled to accurately calculate the power loss. In this paper, a method to reduce the ripple current in a constant Volts/Hertz (V/f) pulse amplitude modulation (PAM/PWM) converter driving an induction motor is investigated. The DC bus voltage amplitude is reduced in proportion to speed by a buck or current source rectifier (CSR) and the PWM modulation index is increased to achieve a reduced ripple current below base speed. It is shown that this mode of operation can lead to a significant reduction in capacitor power loss leading to increased capacitor lifetime or decreased capacitor size. The capacitor heating is analyzed using numerical and analytical techniques. Experimental results are provided to verify the analytical results.
Starting Page	2371
Ending Page	2377
File Size	434170
Page Count	7
File Format	PDF
ISBN	0780374207
ISSN	01972618
DOI	10.1109/IAS.2002.1042777
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation Pulse width modulation converters Paramagnetic resonance Capacitors Heating Failure analysis Pulse width modulation Variable speed drives Frequency Chemicals
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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