ZMW风力发电机组塔架结构分析研究_硕士学位论文.pdf

华中科技大学
硕士学位论文
MW级直驱式永磁风力发电机谐波及其影响分析
姓名:陈正胜
申请学位级别:硕士
专业:电机与电器
指导教师:周理兵
2011-01-08
华中科技大学硕士学位论文
摘要
风能是一种干净的可再生能源,它的优势在于不需要燃料、不占用耕地、无污染、
风力发电的运行成本低。世界各国的风力发电产业发展迅速,兆瓦级风力发电机已经
比较普遍。虽然中国的风电产业起步得迟,但近年来每年新增的风电机组容量在全球
范围内都是领先的。发展风力发电技术是中国解决能源问题的重要途径。
永磁风力发电采用风力机直接驱动发电机的发电方式,虽然省去了齿轮箱,但这
种方式却给发电机带来了更多的振动。直接驱动的方式也决定了发电机的额定转速太
低,以至电机结构太大的特点。电机自身产生的脉动转矩对低速电机的影响是很大的,
它和风力机的振动耦合在一起会使电机产生较大危害的振动。因此,应尽量减少气隙
谐波磁场和电机运行时的时间谐波,降低脉动转矩。对于钕铁硼永磁体,应对其进行
涡流损耗分析以避免温升过大而失磁。
本文分析了永磁风力发电机空载时的磁场谐波情况,并探讨了削弱空间谐波的办
法;将有限元模型的计算与电机外电路结合起来,更准确、更有效地分析了永磁风力
发电机经不控整流方式带负载时的时间谐波情况;最后作了电机激振力和涡流损耗的
分析。

关键词:永磁风力发电机空间谐波时间谐波激振力涡流损耗

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华中科技大学硕士学位论文
ABSTRACT
Wind power is clean and renewable, it has the advantage of no fuel, no occupation of
cultivated land, non-polluting. And wind power generation has low operating cost.
The world's wind power industry has developed rapidly, MW wind turbines have been
China's wind power industry started late, but in recent years the
annual increase of wind turbine capacity is leading the world. Development of wind power
generation technology is an important way to solve the energy problem in china.
The wind turbine directly drive wind generator for Permanent wind power
system. Although the gearbox would not to be needed anymore, but the wind turbine causes
more vibration for wind generator’s rated speed is too low because of the
direct-drive operation , then the motor has to be too large. Self-generated torque ripple
could make an manifest effect low-speed motor,when it coupled with the vibration of wind
turbine, a greater hazard will make to the wind , we should minimize
the air gap harmonic ic field and the time harmonics to reduce the torque ripple. For
the NdFeB permanent , eddy loss should be analyzed in order to avoid excessive
temperature rise and the loss of ic’s field.
This paper analyzes the permanent wind generator’s ic field harmonics
for