Minimum Torque Ripple Pulse Width Modulation with Reduced Switching Frequency for Medium-Voltage Motor Drive

Hyun Sam Jung, Chae Eun Hwang, Hyeon Sik Kim, Seung Ki Sul, An Hee-Won, Hyunjae Yoo

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

In this paper, the characteristics of ripple current of a multimegawatt drive system fed by a pulse-width modulation (PWM) inverter are investigated. Based on the investigation, a novel PWM scheme is devised to reduce the switching loss of the inverter under an identical amount of torque ripple of a motor. The proposed PWM is composed of two parts. The first is minimum torque ripple PWM (MTRPWM), which is optimized in terms of the minimum torque ripple in high modulation index (MI). The second determines the minimum switching frequency while holding the average torque ripple less than the allowable value under various operating conditions. It is termed reduced switching frequency PWM (RSFPWM). Consequently, by simply changing the PWM method from conventional fixed switching frequency continuous PWM to the proposed PWM, MTRPWM and RSFPWM, simulation results show that the switching loss of the inverter driving a 3.5 MW induction motor is reduced to 51.6% while keeping the torque ripple in the allowable boundary, where MI is 1.12. This approach is applied to small-scale experimental sets consisting of an interior permanent magnet synchronous machine (IPMSM) motor-generator set, and an induction machine MG set in an effort to verify the validity and feasibility of the proposed method. Based on these experimental results, the cost indexes of the IPMSM and the induction machine, as defined in this paper, decrease by up to 66% and 77%, respectively, when the proposed method is applied when MI is 1.12 compared with the outcome with the conventional PWM.

Original languageEnglish
Pages (from-to)3315-3325
Number of pages11
JournalIEEE Transactions on Industry Applications
Volume54
Issue number4
DOIs
StatePublished - 1 Jul 2018

Keywords

  • Fan
  • motor drive
  • pulse-width modulation (PWM)
  • pump
  • switching loss
  • torque ripple

Fingerprint

Dive into the research topics of 'Minimum Torque Ripple Pulse Width Modulation with Reduced Switching Frequency for Medium-Voltage Motor Drive'. Together they form a unique fingerprint.

Cite this