基于空间极对数宽频带耦合的双转子同步风力发电机电磁特性分析

Electromagnetic Characteristics Analysis of Dual-Rotor SynchronousWind Generator Based on Wideband Coupling of Spatial Pole Pairs

【目的】针对传统大型永磁同步风力发电机无法实现励磁磁场的调节、传统双馈发电机无法实现直驱且存在后期维护等问题,设计了一种模块化双转子同步风力发电机。【方法】该发电机定子绕组为分数槽集中绕组(FSCW);双转子绕组均为集中绕组且采用直流激励;定子激励产生的两个主导极分别与两个转子的主导极进行磁通匝链。首先,介绍了所设计发电机的基本结构与工作原理;其次,建立了该类发电机的数学模型,并依托于FSCW理论分析其磁链、感应电动势等电磁特性;最后,建立有限元仿真模型,将仿真与理论结果进行对比分析。【结果】结果表明:定、转子齿部导磁面正对位置处磁链计算较为准确,而定、转子齿部偏移处由于含有气隙漏感存在一定的计算偏差。【结论】仿真与理论结果基本吻合,验证了所设计的模块化双转子同步风力发电机的正确性。

[Objective]To address the limitations of traditional large-scale permanent magnet synchronous wind generators,which cannot regulate the excitation magnetic field,and traditional double-fed generators,which are not suitable for direct drive and require post-installation maintenance,a modular dual-rotor synchronous wind generator is proposed.[Method]The stator winding of the generator was designed using fractional slot concentrated winding(FSCW),while both rotor windings were concentrated and excited by direct current.The stator excitation generated two dominant poles,which magnetically coupled with the dominant poles of the two rotors,forming a flux linkage.First,the basic structure and operating principle of the generator were introduced.Following this,a mathematical model was developed and the electromagnetic characteristics,including flux linkage and induced electromotive force,were analyzed based on FSCW theory.Finally,a finite element simulation model was created,and the simulation results were compared with the theoretical predictions.[Results]The results indicated that flux linkage calculations were accurate when the magnetic surfaces of the stator and rotor teeth were aligned.However,when the teeth were misaligned,the presence of air-gap leakage inductance introduced a certain degree of error in the calculations.[Conclusion]The simulation results are generally consistent with the theoretical calculations,validating the accuracy of the proposed modular dual-rotor synchronous wind generator design.