3MW直驱永磁风力发电机电磁设计与理论规律研究
发布时间：2018-08-04 19:51
【摘要】：随着全球能源危机的加剧和人们环保意识的增强，可再生能源的利用倍受重视，其中风力发电因其相关技术成熟、可规模开发等特点而得到较快发展。传统的风力发电机为双馈感应发电机，因其具有复杂的励磁系统和齿轮变速箱而限制了其应用和发展。本文中设计的风力发电机使用永磁体励磁，并采用直接驱动方式。这种直驱永磁风力发电机使风力发电系统大为简化，提高了发电机的运行稳定性和发电效率。 本文根据直驱永磁发电机区别于传统发电机的新结构特点、设计特点和运行特点，采用了分数槽的极槽配合来设计直驱永磁发电机，并结合使用了双层叠绕组，获得了正弦性很好的发电波形，，有效地降低了齿槽转矩。在有限元软件的二维电磁场中建立了发电机模型和外电路模型，并对其进行了空载、额定负载、三相短路状况下的运行性能分析，验证了本电磁设计的合理性。并结合分析结果计算了功率因数、漏磁系数和电抗参数。本文还对不同的极槽配合进行对比分析，从中选取了最优方案，使得感应电动势谐波畸变率最小，齿槽转矩最小。 重点研究了直驱永磁风力发电机退磁风险分析。探究了分数槽永磁发电机的退磁特点和分析方法，通过对短路时转子初始角参数化，寻找到退磁风险最大的时刻，并进一步对磁极不同表面深度处磁密进行分析，确定了最大退磁风险点的位置。研究还得到了A相轴线与d轴夹角θ0从0到90变化过程中磁极磁密曲线变化趋势，探究了磁极外表面前、后两端点处的磁密大小变化过程，从而得到了磁密曲线畸变规律和最大退磁风险点的移动趋势。
[Abstract]:With the aggravation of the global energy crisis and the enhancement of people's awareness of environmental protection, the utilization of renewable energy has been paid more attention, among which wind power has been developed rapidly because of its mature technology and scale development. The traditional wind turbine is a doubly-fed induction generator. Its application and development are limited by its complicated excitation system and gear gearbox. The wind turbine designed in this paper uses permanent magnet excitation and adopts direct drive mode. The direct-drive permanent magnet wind turbine greatly simplifies the wind power generation system and improves the stability and efficiency of the generator. According to the new structure characteristic, design characteristic and operation characteristic of direct-drive permanent magnet generator which is different from traditional generator, this paper adopts the pole slot coordination of fractional slot to design direct-drive permanent magnet generator, and uses double layer stacked windings. The sinusoidal waveform is obtained and the torque of the tooth slot is reduced effectively. The generator model and the external circuit model are established in the two-dimensional electromagnetic field of the finite element software, and the operating performance of the generator is analyzed under the condition of no-load, rated load and three-phase short circuit, which verifies the rationality of the electromagnetic design. The power factor, flux leakage coefficient and reactance parameters are calculated based on the analysis results. By comparing and analyzing the different pole-slot coordination, the optimal scheme is selected, which makes the harmonic distortion rate of induction electromotive force minimum and the torque of tooth slot minimum. The risk analysis of direct drive permanent magnet wind turbine demagnetization is studied. The demagnetization characteristics and analysis method of fractional slot permanent magnet generator are studied. By parameterizing the initial angle of the rotor during short circuit, the maximum demagnetization risk is found, and the magnetic density at different surface depth of magnetic pole is further analyzed. The location of the maximum demagnetization risk point is determined. The change trend of magnetic density curve of magnetic pole during the change of angle 胃 0 between phase A axis and d axis from 0 to 90 is also obtained, and the change process of magnetic density at the front of the magnetic pole and at the point at the end of the pole is investigated. The distortion law of magnetic density curve and the movement trend of maximum demagnetization risk point are obtained.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315
本文编号：2164967
[Abstract]:With the aggravation of the global energy crisis and the enhancement of people's awareness of environmental protection, the utilization of renewable energy has been paid more attention, among which wind power has been developed rapidly because of its mature technology and scale development. The traditional wind turbine is a doubly-fed induction generator. Its application and development are limited by its complicated excitation system and gear gearbox. The wind turbine designed in this paper uses permanent magnet excitation and adopts direct drive mode. The direct-drive permanent magnet wind turbine greatly simplifies the wind power generation system and improves the stability and efficiency of the generator. According to the new structure characteristic, design characteristic and operation characteristic of direct-drive permanent magnet generator which is different from traditional generator, this paper adopts the pole slot coordination of fractional slot to design direct-drive permanent magnet generator, and uses double layer stacked windings. The sinusoidal waveform is obtained and the torque of the tooth slot is reduced effectively. The generator model and the external circuit model are established in the two-dimensional electromagnetic field of the finite element software, and the operating performance of the generator is analyzed under the condition of no-load, rated load and three-phase short circuit, which verifies the rationality of the electromagnetic design. The power factor, flux leakage coefficient and reactance parameters are calculated based on the analysis results. By comparing and analyzing the different pole-slot coordination, the optimal scheme is selected, which makes the harmonic distortion rate of induction electromotive force minimum and the torque of tooth slot minimum. The risk analysis of direct drive permanent magnet wind turbine demagnetization is studied. The demagnetization characteristics and analysis method of fractional slot permanent magnet generator are studied. By parameterizing the initial angle of the rotor during short circuit, the maximum demagnetization risk is found, and the magnetic density at different surface depth of magnetic pole is further analyzed. The location of the maximum demagnetization risk point is determined. The change trend of magnetic density curve of magnetic pole during the change of angle 胃 0 between phase A axis and d axis from 0 to 90 is also obtained, and the change process of magnetic density at the front of the magnetic pole and at the point at the end of the pole is investigated. The distortion law of magnetic density curve and the movement trend of maximum demagnetization risk point are obtained.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315
【引证文献】
相关硕士学位论文 前3条
1 刘天知;750kW观光艇推进用混合永磁同步电动机研究[D];湖北工业大学;2016年
2 苏斌;浮体绳轮波浪发电机的研究[D];山东大学;2015年
3 练正兵;兆瓦级高速永磁同步风力发电机电磁设计及温度场分析[D];上海电机学院;2015年
本文编号：2164967
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