Abstract
A novel type of multi-degree-of-freedom (multi-DOF) deflecting-type permanent-magnet synchronous wind generator (PMSWG) is constructed to improve the reliability and utilization of wind energy. The basic working principle of the multi-DOF deflecting-type permanent-magnet synchronous generator (PMSG) is introduced, and its structural size is experimentally and theoretically determined. Subsequently, the multi-DOF deflecting-type PMSG was used to operate a complete wind turbine. A prototype and three-dimensional (3D) model of the wind turbine is simulated, allowing one to analyze the aerodynamics of the turbine and power generation performance. The electromagnetic field analysis is performed via analytical methods, followed by a 3D finite element and torque analyses. Furthermore, the wind turbine power generation characteristics curves are obtained through simulation software. Finally, transient analysis of post deflection is demonstrated. The before and after deflection values of the generator voltage, current, flux linkage, and induced voltage are compared and analyzed, relying on simulations and experiments. Additionally, the wind tunnel experiment is used to compare voltage variation with wind direction. The comparison reveals that the wind generator phase voltage remains maximized with wind direction variation. The results confirm that the proposed PMSWG has excellent performance and future research potential.
Highlights
Wind energy is deemed a prospective energy source, owing to its clean and economic characteristics.The current target of the World Wind Energy Association is to generate 30% of worldwide electricity using wind power by 2025
The electrical energy produced by a doubly-fed asynchronous generator is directly connected to a power grid through a boost transformer
Both power and efficiency can improve by approximately 8 % to 10 % when compared with no deflection in the rotor, making it more attractive than other wind generators
Summary
The current target of the World Wind Energy Association is to generate 30% of worldwide electricity using wind power by 2025. The wind generator has become a common research subject [1,2,3]. Most common wind power generators are squirrel cage asynchronous generators, permanent-magnet synchronous generators (PMSG), and doubly-fed asynchronous generators. The squirrel cage asynchronous generator wind turbine has low efficiency, as it cannot adjust the speed to obtain maximum wind energy. The gearbox therein increases the weight of the generator and reduces its efficiency. The electrical energy produced by a doubly-fed asynchronous generator is directly connected to a power grid through a boost transformer. The lagging reactive power from a grid must be absorbed, as it increases the power factor and burdens the grid
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