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Reduced Order Modeling for Power Electronics Applications

[+] Author Affiliations
Bing-Chung Chen

Teledyne Scientific Company, Thousand Oaks, CA

Lixiang Wei

Rockwell Automation – Allen Bradley, Mequon, WI

Paper No. DETC2012-71354, pp. 181-185; 5 pages
  • ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 6: 1st Biennial International Conference on Dynamics for Design; 14th International Conference on Advanced Vehicle Technologies
  • Chicago, Illinois, USA, August 12–15, 2012
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-4505-9
  • Copyright © 2012 by ASME


In this work, a model order reduction (MOR) technique for system-level modeling for motor drive dynamic system is presented. As the power electronics continues towards higher switching speed, higher packaging density, and power dissipation, it is critical to have a compact electro-thermal model, easily transferred into a micro-processor, to predict the online temperature dynamics, for self-production, especially at low output-speed conditions when the power chip could potentially operate at over temperature conditions.

The compact model generation process starts with electro-thermal modeling with the commercial finite element package to generate full-order system matrices. The corresponding reduced model is then constructed by retrieving the original full-order system matrices then projecting these matrices into a low-order Krylov subspace. This subspace is spanned by orthogonal basis vectors, obtained by an Arnoldi algorithm. The generated compact model is then incorporated into system-level modeling simulator such as Simplorer or Simulink for fast transient and frequencies simulation. It is demonstrated that the reduced order models are at two orders of magnitude smaller than the full model and still preserve the dynamics characteristics and required accuracy for industrial applications. Due to their compact size, the compact models give significantly speed-up and allow product design engineers to accurately predict temperature response of motor drive at product prototype stage, not otherwise obtainable without this technology.

Copyright © 2012 by ASME
Topics: Modeling , Electronics



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