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Harmonic and Torque Ripple Reduction of Electric Propulsion System using 12-Pulse Diode Rectifier by Auxiliary Supply

보조 전원을 이용한 12 펄스 다이오드 정류기를 사용하는 추진시스템의 고조파 및 토크 리플 저감

  • Kim, Jong-Su (Division of Marine System Engineering, Korea Maritime University) ;
  • Seo, Dong-Hoan (Division of Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Choi, Jae-Hyuk (Division of Marine System Engineering, Korea Maritime University)
  • 김종수 (한국해양대학교 기관시스템공학부) ;
  • 서동환 (한국해양대학교 전기전자공학부) ;
  • 최재혁 (한국해양대학교 기관시스템공학부)
  • Received : 2012.10.23
  • Accepted : 2013.02.25
  • Published : 2013.02.28

Abstract

The input current of three phase rectifier which is mainly used in the propulsion system of the electric propulsion ship includes a variety of low order harmonics. To reduce these harmonics, the power conversion system, used in the large vessels which high power is required, is currently used the rectifiers of 12-pulse output, but it still has a problem that occurs $12{\pm}1$ harmonics. Also, in the case of the direct torque control technique which is widely used for the speed and torque control, the torque ripple is severe and the input current of motor has greatly included harmonics by the switching of the inverter. In order to reduce harmonics and improve the performance of torque control, this paper presents that the auxiliary supply assisted into the 12-pulse rectifier of the electric propulsion system using direct torque control technique. We confirm the validity of the proposed method through the simulation under the environment of a real vessel system.

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