Transactions of China Electrotechnical Society  2015, Vol. 30 Issue (24): 23-31    DOI:
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A Novel Direct Torque Control Strategy of Induction Machine Drives with Simple Duty Ratio Calculation
Li Zhengxue1, Zhang Yongchang2, Li Zhengxi2, Ban Xiaojuan1, Yang Haitao2
1. University of Science and Technology Beijing Beijing 100083 China; 2. Power Electronics and Motor Drivers Engineering Research Center of Beijing North China University of Technology Beijing 100144 China

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Abstract  The traditional switching-based direct torque controlled (ST-DTC) induction motor drive is usually affected by large torque ripple and steady-state error of torque. The existing literature has proposed some methods to reduce torque ripple by optimizing the duty ratio of the active vector. However, these methods are usually complicated and depend heavily on motor parameters. Based on the analysis in instantaneous variation rates of stator flux and torque caused by each voltage vector, a simple and effective method considering the effect of machine velocity is proposed to acquire the duty ratio. The proposed scheme is able to reduce the torque ripple and steady-state error of torque significantly, while maintaining the simplicity and robustness of the traditional DTC at the most. Simulations and experimental results validate the proposed scheme.
Key wordsDirect torque control      induction motor      ripple reduction      duty ratio      steady-state error     
Received: 09 April 2014      Published: 30 December 2015
PACS: TM343  
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Li Zhengxue
Zhang Yongchang
Li Zhengxi
Ban Xiaojuan
Yang Haitao
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Li Zhengxue,Zhang Yongchang,Li Zhengxi等. A Novel Direct Torque Control Strategy of Induction Machine Drives with Simple Duty Ratio Calculation[J]. Transactions of China Electrotechnical Society, 2015, 30(24): 23-31.
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