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Design and Optimization on Dual-Rotor Permanent-Magnet Wind Generator

Author: ZhuWenJuan
Tutor: YangXiangYu
School: South China University of Technology
Course: Motor and electrical
Keywords: Dual-Rotor Permanent-Magnet Wind Generator Equivalent Magnetic Circuit Method Finite Element Analysis Taguchi Method
CLC: TM315
Type: Master's thesis
Year: 2011
Downloads: 83
Quote: 0
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Abstract


With the aggravation of the global energy crisis, the exploitation of renewable energy is drawing more and more attention from the domestic and overseas researchers and engineers. The utilization of wind energy becomes one of the most popular research topics since it is a kind of clean and renewable energy. Therefore, the study on wind power generating system, especially the wind generator, has a wide field of application prospects.A dual-rotor permanent-magnet wind generator (DRPMWG) has a similar structure with that of a traditional permanent-magnet synchronous generator. However, a DRPMWG has two rotors and its outer rotor is correspondence to the stator of a traditional permanent-magnet wind generator. This kind of generator can start to generate electricity as long as the wind speed reaches one half of the lowest operating wind speed of a traditional permanent-magnet generator, while the highest speed keeps the same if the two generators are with the same poles. Thus, a DRPMWG can widen the range of operating wind speed and improve the ratio of wind utilization, which provides the important theoretical and practical significance of the study and development on the generator.In this dissertation, a brief introduction is firstly presented about the principle structure, mathematical model and overall design proposal of the DRPMWG. After that, the equivalent magnetic circuit of the generator without load is analyzed and calculated based on the theory of common permanent magnet wind generator. In this process, several key parameters that have certain impact on the electromagnetic design are specially considered and discussed.By using the finite element analysis software Ansoft, some simulations and analysis of static electromagnetic filed of the generator are carried out for both situatations of with load and without load. Also, the airgap flux density and electromotive force are obtained.The Taguchi method is adopted in the optimization of the DRPMWG. After determining the target parameters that should be optimized, several groups of parameters are picked up to perform an orthogonal experiment. According to the analysis comparison of the experimental results, the group that has the best comprehensive performance is chosen for finite element simulation. The simulation results demonstrate that Taguchi method is effective in the design and optimization of this generator.This dissertation presents the overall design proposal of DRPMWG, uses the equivalent magnetic circuit to implement the preliminary electromagnetic design, then anslyzes the electromagnetic filed with the help of the finite element analysis software Ansoft, use Taguchi Method when designing motor optimization. It can be seen from the simulation and experimental results that the proposed design and optimization of dual-rotor permanent-magnet wind generator is feasible, which provides the theoretical foundation for the further development of the dual-rotor permanent-magnet wind power generating system.

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Wind turbines
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