Abstract
This paper is devoted to the analysis and design of high performance permanent-magnet synchronous wind generators (PSWGs). A systematic and sequential methodology for the design of PMSGs is proposed with a high performance wind generator as a design model. Aiming at high induced voltage, low harmonic distortion as well as high generator efficiency, optimal generator parameters such as pole-arc to pole-pitch ratio and stator-slot-shoes dimension, etc. are determined with the proposed technique using Maxwell 2-D, Matlab software and the Taguchi method. The proposed double three-phase and six-phase winding configurations, which consist of six windings in the stator, can provide evenly distributed current for versatile applications regarding the voltage and current demands for practical consideration. Specifically, windings are connected in series to increase the output voltage at low wind speed, and in parallel during high wind speed to generate electricity even when either one winding fails, thereby enhancing the reliability as well. A PMSG is designed and implemented based on the proposed method. When the simulation is performed with a 6 Ω load, the output power for the double three-phase winding and six-phase winding are correspondingly 10.64 and 11.13 kW. In addition, 24 Ω load experiments show that the efficiencies of double three-phase winding and six-phase winding are 96.56% and 98.54%, respectively, verifying the proposed high performance operation.
Highlights
The permanent-magnet synchronous generator (PMSG), which is less noisy, high efficiency and has a long life span, has becomes one of the most important types of equipment in wind turbine systems.In 2008, Bumby designed and fabricated a 5 kW, 150 rpm axial vertical permanent-magnet (PM) generator driven directly by wind and a water turbine, where the generator uses trapezoidal shaped magnets to enhance the magnetism over conventional circular magnets
The finite element method from the Maxwell-2D software will be used throughout the analysis and design
This paper presents a systematic and sequential methodology for the design of PMSGs
Summary
The permanent-magnet synchronous generator (PMSG), which is less noisy, high efficiency and has a long life span, has becomes one of the most important types of equipment in wind turbine systems.In 2008, Bumby designed and fabricated a 5 kW, 150 rpm axial vertical permanent-magnet (PM) generator driven directly by wind and a water turbine, where the generator uses trapezoidal shaped magnets to enhance the magnetism over conventional circular magnets. The permanent-magnet synchronous generator (PMSG), which is less noisy, high efficiency and has a long life span, has becomes one of the most important types of equipment in wind turbine systems. In 2011, Maia used finite element method (FEM) software to analyse the operation characteristics of an axial PM wind turbine with rated output power of 10 kW while running at the speed of 250 rpm [2]. He [3] indicated that the electromagnetic properties of the permanent-magnet machine are highly dependent on the number of slots per pole, phase, magnet shape, the stator slots and the slot opening. The third harmonic distortion measured is 5.8% under no-load and load of a 12 kW direct driven PM synchronous generator [4]
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