Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Dead Time Compensation and Polarity Check of Phase Currents Based on Programmable Low-pass Filter for Automotive Electric Drive Systems

자동차 전동 시스템을 위한 Programmable 저역 통과 필터 기반의 상전류 극성 판단 및 데드타임 보상

  • Choi, Chinchul (Department of Control and Instrumenation Engineering, Graduate School of Changwon National University) ;
  • Lee, Kangseok (Department of Control and Instrumenation Engineering, Graduate School of Changwon National University) ;
  • Lee, Wootaik (Department of Control and Instrumenation Engineering, Changwon National University)
  • 최진철 (창원대학교 대학원 제어계측공학과) ;
  • 이강석 (창원대학교 대학원 제어계측공학과) ;
  • 이우택 (창원대학교 제어계측공학과2)
  • Received : 2013.12.03
  • Accepted : 2014.04.21
  • Published : 2014.09.01
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Abstract

This paper proposes a dead time compensation method for an AC motor drive using phase current polarity information which is detected based on a digital programmable low-pass filter (PLPF). The polarity detection using the PLPF is an alternative solution of a conventional method which uses a general low-pass filter (LPF) and hysteresis bands in order to avoid jittering due to noises. The PLPF not only adjusts its cutoff frequency according to the synchronous frequency of AC motors but also eliminates a gain attenuation and phase delay which are main problems of the general LPF. Through the PLPF, a fundamental component signal without gain and phase distortions is extracted from the measured raw current signal with noise. By use of the fundamental component, the polarity of current is effectively detected by reducing the hysteresis band. Finally, the proposed method compensates the dead time effects by adding or subtracting average voltage value to voltage references of the controller according to the detected current polarity information. The proposed compensation method is experimentally verified by compared with the conventional method.

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References

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