Reduction of DC-Bus Capacitor Ripple Current With PAM/PWM Converter
- 30 March 2004
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industry Applications
- Vol. 40 (2) , 607-614
- https://doi.org/10.1109/tia.2004.824495
Abstract
Electrolytic capacitors are used in nearly all adjustable-speed drives, and they are one of the components most prone to failure. The main failure mechanisms include loss of electrolyte through outgassing and chemical changes to the electrolyte and oxide layer. All the degradation mechanisms are exacerbated by ripple current heating. Since the equivalent series resistance 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 pulse-amplitude-modulation (PAM)/pulsewidth-modulation (PWM) converter driving an induction motor is investigated. The dc-bus voltage amplitude is reduced in proportion to speed by a buck or current stiff rectifier and the PWM modulation index is maintained at a high level to achieve a reduced ripple current below base speed. By comparison with a diode-bridge-fed PWM voltage stiff inverter, it is shown that the PAM/PWM 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.Keywords
This publication has 8 references indexed in Scilit:
- A general analytical method for determining the theoretical harmonic components of carrier based PWM strategiesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- A method for predicting the expected life of bus capacitorsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- A novel PAM inverter system for induction motor drivePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- The service life of large aluminum electrolytic capacitors: effects of construction and applicationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Coaxial current transformer for test and characterization of high-power semiconductor devices under hard and soft switchingIEEE Transactions on Industry Applications, 2000
- An evaluation of the DC-link capacitor heating in adjustable speed drive systems with different utility interface optionsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1999
- Control topology options for single-phase UPS invertersIEEE Transactions on Industry Applications, 1997
- Three-Phase AC/DC PWM Converter with Sinusoidal AC Currents and Minimum Filter RequirementsIEEE Transactions on Industry Applications, 1987