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Title: Design, modeling, and control of a novel hybrid-excited flux-bidirectional-modulated generator-based wind power generation system
Authors: Wang, Q 
Niu, S 
Keywords: Bidirectional flux modulating
Constant voltage
Maximum power point tracking (MPPT) control
Permanent magnet (PM)-iron structure
Issue Date: 2018
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on power electronics, 2018, v. 33, no. 4, 7927718, p. 3086-3096 How to cite?
Journal: IEEE transactions on power electronics 
Abstract: This paper proposes a novel hybrid excited generator, which is suitable for a variable-speed wind power generation system. Two sets of excitation sources are employed, which are permanent magnets (PMs) on the rotor and the field windings on the stator. The rotor is design with PM-iron structure, namely the PMs and iron poles are alternatively located in rotor, which can provide PM excitation and flux modulating simultaneously. Meanwhile, the adjacent stator teeth are designed with different height, which enables the stator with flux modulating effect, and, therefore, bidirectional flux modulating can be achieved. Some specific harmonics excited by the rotor PMs can be effectively adjusted by the field current, and the back electromotive force and electromagnetic torque can be regulated accordingly. Therefore, the proposed generator can achieve constant voltage control and maximum power point tracking control by controlling the field current. The design considerations and field regulating principle are analytically investigated. An improved Tabu search algorithm is used to optimize the proposed generator, and finite-element method is used to realize preliminary study of the electromagnetic performances. A prototype is manufactured and experimental tests are conducted to verify the theoretical analysis and control strategies.
ISSN: 0885-8993
EISSN: 1941-0107
DOI: 10.1109/TPEL.2017.2704103
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