Online feedback-based field weakening control of interior permanent magnet brushless AC drives for traction applications accounting for nonlinear inverter characteristics

K. D. Hoang, J. Wang, H. Aorith

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)

Abstract

This paper presents an online feedback-based (FB) field weakening (FW) control technique for interior permanent magnet (IPM) brushless AC (BLAC) machines with due accounting for nonlinear machine parameters and inverter characteristics in traction applications. The proposed method computes the dq-axis current references online instead of employing predefined look-up tables (LUT) as in the conventional schemes. Thus, it provides the flexibility for online parameter update or estimation to enhance the drive system efficiency. It is shown that in the FB-based FW operation where the machine voltage magnitude is maintained at the voltage hexagon boundary via the voltage FB loop using the ideal FB voltage references which the nonlinear inverter characteristics are neglected, the stator flux reference regulated via the voltage FB loop may not be optimally controlled due to the mismatch between the ideal demand and actual voltages applied to the IPM BLAC machine. For a given torque, it results in a higher current magnitude than the ideal demand, and therefore leads to extra copper losses. To solve this problem, a nonlinear inverter compensation (NIC) method is proposed and experimentally validated by measurements on a 10kW IPM BLAC drive. It is shown that by incorporating the proposed NIC technique, the achievable torque under a given speed can be increased up to 4% and the copper losses under a torque demand and given speed can be reduced up to 4% in the FW operation region.

Original languageEnglish
Title of host publication7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014
PublisherIET Conference Publications
Number of pages6
Edition628 CP
ISBN (Electronic)9781849198158
DOIs
Publication statusPublished - 19 Jun 2014
Externally publishedYes
Event7th IET International Conference on Power Electronics, Machines and Drives - Manchester, United Kingdom
Duration: 8 Apr 201410 Apr 2014
Conference number: 7

Publication series

Name7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014

Conference

Conference7th IET International Conference on Power Electronics, Machines and Drives
Abbreviated titlePEMD 2014
CountryUnited Kingdom
CityManchester
Period8/04/1410/04/14

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