Title: Three-Terminal Common-Mode EMI Model for EMI Generation, Propagation, and Mitigation in a Full-SiC Three-Phase UPS Module

Journal Article · · IEEE Transactions on Power Electronics
ORCiD logo [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [2];  [2]; ORCiD logo [4];  [5]
  1. Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States); Virginia Polytechnic Institute and State University
  2. Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
  3. Texas Instrument Inc., Santa Clara, CA (United States)
  4. ABB US Corporate Research, Raleigh, NC (United States)
  5. ABB Power Solutions, Richmond, VA (United States)
+ Show Author Affiliations

With superior loss characteristics, wide bandgap devices such as silicon carbide (SiC) MOSFETs are expected to replace Si-IGBTs in grid-connected applications. Uninterruptible power supply (UPS) is an application in which low conduction-loss and switching-loss from SiC devices can largely improve the system efficiency. However, fast switching of a SiC MOSFET worsens the electromagnetic interference (EMI). In addition, the UPS is comprised of multiple converters wherein different combinations of the converters take part in power-transfer depending on the mode of operation. This complicates the prediction and strategies for noise, especially the common-mode (CM) part. Such complexity calls for deliberate strategies to be set before prototyping to contain and mitigate the CM noise. In this paper, a three-terminal CM circuit model is presented for a three-phase UPS with an active battery charger and a battery rack. The significance of a dc-dc converter on CM EMI generation and propagation has been analyzed based on the model. In a mode of operation where the dc-dc converter is active, a considerable amount of the CM noise is generated from the dc-dc converter. Also, the multiple resonances on the propagation path associated with dc inductors and the battery rack highly deteriorates CM EMI. As a mitigation strategy in the design phase, different topologies and PWM schemes for the ac-ac stage and the dc-dc stage have been compared based on the model. Furthermore, a 20 kW full-SiC UPS has been built and tested to experimentally verify the impact of the dc-dc converter operation on the noise and to validate the mitigation strategy.

Research Organization:
Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0006521
OSTI ID:
2441317
Journal Information:
IEEE Transactions on Power Electronics, Journal Name: IEEE Transactions on Power Electronics Journal Issue: 9 Vol. 34; ISSN 0885-8993
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

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42 ENGINEERING
AC–AC conversion
ac–dc conversion
electromagnetic interference (EMI)
uninterruptible power supply (UPS)
wide-bandgap devices (WBG)