Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/62130
Title: Maximum power point tracking sensorless control of an axial-flux permanent magnet vernier wind power generator
Authors: Luo, X
Niu, S 
Keywords: Axial flux permanent magnet machine
MPPT
Sensorless control
SMO
Vernier machine
Issue Date: 2016
Publisher: Molecular Diversity Preservation International (MDPI)
Source: Energies, 2016, v. 9, no. 8, 581 How to cite?
Journal: Energies 
Abstract: Recently, Vernier permanent magnet (VPM) machines, one special case of magnetic flux-modulated (MFM) machines, benefiting from their compact, simple construction and low-speed/ high-torque characteristics, have been receiving increasing interest. In this paper, the Vernier structure is integrated with an axial-flux PM machine to obtain the magnetic gear effect and produce an improved torque density for direct-drive wind power generation application. Another advantage of the proposed machine is that the stator flux rotating speed can be relatively high when the shaft speed is low. With this benefit, sensorless control strategy can be easily implemented in a wide speed range. In this paper, an improved sliding mode observer (SMO) is proposed to estimate the rotor position and the speed of the proposed machine. With the estimated shaft speeds, the maximum power point tracking (MPPT) control strategy is applied to maximize the wind power extraction. The machine design and the sensorless MPPT control strategy are verified by finite element analysis and experimental verification.
URI: http://hdl.handle.net/10397/62130
EISSN: 1996-1073
DOI: 10.3390/en9080581
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