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Simple and robust predictive direct control of DFIG with low constant switching frequency and reduced torque and flux ripples

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5 Author(s)
Jiefeng Hu ; School of Electrical, Mechanical and Mechatronic Systems, University of Technology, Sydney, Australia ; Jianguo Zhu ; Yongchang Zhang ; Qishuang Ma
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For conventional direct torque control (CDTC) methods, there are usually undesired torque and flux ripples mainly for two reasons. First, the vectors selected are not necessary the best. Secondly, one-step delay influence in digital implementation causes additional torque and flux ripples. This paper proposes a novel predictive direct torque control (PDTC) strategy of the doubly fed induction generator (DFIG). The proposed strategy aims to reduce torque and flux ripples effectively at low constant switching frequency by appropriately arranging two active vectors followed by one zero vector within one control period. Furthermore, one-step delay is compensated using a mode-based prediction scheme. Finally, the control system is simplified through further analysis of the transient slope of torque and flux without performance degradation. Simulation results validate the proposed strategy with excellent steady-state and transient performance, which makes it very suitable for wind power generation.

Published in:

2011 IEEE International Electric Machines & Drives Conference (IEMDC)

Date of Conference:

15-18 May 2011