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Control of Electrically Excited Synchronous Motors with a Low Switching Frequency
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  • Control of Electrically Excited Synchronous Motors with a Low Switching Frequency
  • Control of Electrically Excited Synchronous Motors with a Low Switching Frequency
저자명
Yuan. Qing-Qing,Wu. Xiao-Jie,Dai. Peng,Fu. Xiao
간행물명
Journal of power electronics : JPE
권/호정보
2012년|12권 4호|pp.615-622 (8 pages)
발행정보
전력전자학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

The switching frequency of the power electronic devices used in large synchronous motor drives is usually kept low (less than 1 kHz) to reduce the switching losses and to improve the converter power capability. However, this results in a couple of problems, e.g. an increase in the harmonic components of the stator current, and an undesired cross-coupling between the magnetization current component ($i_m$) and the torque component ($i_t$). In this paper, a novel complex matrix model of electrically excited synchronous motors (EESM) was established with a new control scheme for coping with the low switching frequency issues. First, a hybrid observer was proposed to identify the instantaneous fundamental component of the stator current, which results in an obvious reduction of both the total harmonic distortion (THD) and the low order harmonics. Then, a novel complex current controller was designed to realize the decoupling between $i_m$ and $i_t$. Simulation and experimental results verify the effectiveness of this novel control system for EESM drives.