The Transactions of the Korean Institute of Electrical Engineers B (대한전기학회논문지:전기기기및에너지변환시스템부문B)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

An Improvement on low Speed Operation Performances of DTC for 3-level Inverter-fed Induction Motors

3레벨 인버터로 구동되는 유도전동기 직접토크제어의 저속성능 개선

  • 이교범 (고려대 전기공학과) ;
  • 송중호 (한국과학기술연구원 지능제어연구센터) ;
  • 최익 (한국과학기술연구원 지능제어연구센터) ;
  • 김광배 (한국과학기술연구원 지능제어연구센터) ;
  • 유지윤 (고려대 전기.전자.전파공학부)
  • Published : 2000.10.01
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Abstract

A direct torque control algorithm for 3-level inverter-fed induction motors is presented. Conventional voltage selection methods provoke some problems such as stator flux drooping phenomenon and undersirable torque control appeared especially at the low speed operation. To overcome these problems, a proposed method uses intermediate voltage vectors, which are inherently generated in 3-level inverters. In the proposed algorithm, both subdivision of the basic switching sectors and applications of tntermediated voltages improve the low speed operation characteristics. This algorithm basically considers applications in which direct torque controlled induction motors are fed by 3-level inverters with low switching frequency around 500Hz. An adaptive observer is also employed to bring better responses at the low speed operation, by estimating some state-variables, motor speed and motor parameters which take a deep effect on the performance of the low speed operation. Simulation and experiment results verify effectiveness of the proposed algorithm.

Keywords

References

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