Use of a Series Voltage Compensator for Reduction of the DC-Link Capacitance in a Capacitor-Supported System

A technique for reduction of the dc-link capacitance in a capacitor-supported system is presented. The concept is based on connecting a voltage source in series with the dc bus line to compensate the ripple voltage on the dc-link capacitor, so as to make the output have a near zero ripple voltage. S...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2014-03, Vol.29 (3), p.1163-1175
Main Authors: Huai Wang, Chung, Henry Shu-Hung, Wenchao Liu
Format: Article
Language:English
Subjects:
Applied sciences
Capacitance
Capacitance reduction
Capacitors
Capacitors. Resistors. Filters
Circuit properties
dc-link capacitor
Dielectric, amorphous and glass solid devices
Direct current networks
Electric currents
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical power engineering
Electronic circuits
Electronics
Exact sciences and technology
Inductors
Integrated circuits
power conversion system
Power networks and lines
Power supply
Pulse width modulation
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Switches
Various equipment and components
voltage compensator
Voltage control
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Summary:A technique for reduction of the dc-link capacitance in a capacitor-supported system is presented. The concept is based on connecting a voltage source in series with the dc bus line to compensate the ripple voltage on the dc-link capacitor, so as to make the output have a near zero ripple voltage. Since the voltage compensator processes small ripple voltage on the dc link and reactive power only, it can be implemented with low-voltage devices. The overall required energy storage of the dc-link, formed by a reduced value of dc-link capacitor and the voltage compensator, is reduced, allowing the replacement of popularly used electrolytic capacitors with alternatives of longer lifetime, like power film capacitors, or extending the system lifetime even if there is a significant reduction in the capacitance of electrolytic capacitors due to the aging effect. Comprehensive analysis on the static and dynamic characteristics of the system, and hold-up time requirement will be discussed. The proposed technique is exemplified on an ac-dc-dc power conversion system. Theoretical predictions are favorably verified by experimental results.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2013.2262057