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Convention presentation

Mitigating Harmonics and Detrimental Waveforms Caused by Active Front End and 6, 12, 18 Pulse Drives

  • July 2013
  • Number of views: 4198
  • Article rating: 1.7

Rick Hoadley
ABB

Whenever an application engineer is planning on installing adjustable speed drives for AC motors, line current harmonics and reflected waves are two factors that need to be addressed. Four basic questions should be answered in order to successfully commission the drive system:

  1. What is my power system like today
  2. What impact will the additional drives have on the power quality for the other equipment
  3. If needed, what harmonics mitigation method should be used
  4. How long and what type of cable is used between the drive and motor

This paper, presented at the 2013 EASA Convention, deals with understanding IEEE Std 519 and various mitigation methods in order to meet those recommendations. It also reviews the types of filtering that is available to reduce the reflected waves seen at the motor terminals.

Topics covered include:

  • Overview of drives topologies
  • The differences between 6,12,18 pulse and active front end drives
  • How the differences in drives relate to harmonics generated
  • Filters on either end of the drive to mitigate the effects of harmonics, as well as voltage spikes and other potential damaging effects on the motor

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EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 5: Electronics

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