3MW直驱双定子无刷双馈风力发电机结构设计及优化分析

发布时间：2018-08-06 18:07

【摘要】：化石能源的匮乏以及环境污染问题的日趋严重,促进了新能源技术的高速发展。风能以其资源丰富、可再生、清洁无污染等一系列优点开始得到重视,而且在所有可再生能源利用技术中,风力发电是最成熟、最具规模化和商业开发前景的,风电技术由此迅速发展。双定子无刷双馈发电机作为一种新型交流发电机,具有无刷可靠、可直驱、变频容量小、变速恒频和运行方式多样化的优点,在风电领域具有广阔的应用前景。本文以3MW双定子无刷双馈发电机为研究对象,对双定子无刷双馈发电机进行整体结构设计,并对重要结构进行结构优化。本文主要工作内容如下:首先,本文在深入研究不同风力发电机结构的基础上,根据双定子无刷双馈发电机的特殊性对其进行整体结构设计,并对一些重要结构和结构连接方式进行了分析。其次,对隔磁环和静止轴进行结构优化。在对隔磁环燕尾槽尺寸进行优化的基础上,对隔磁环进行尺寸优化以减轻重量、降低制造成本。静止轴由于整体尺寸较大,实心静止轴的心部结构受力太小,无法有效利用心部材料,故采用空心轴结构,并对其进行尺寸优化分析,使其达到强度要求。最后,对前轴法兰盘、后支撑盘和内定子支撑盘进行结构优化。在对前轴法兰盘进行拓扑优化的基础上,对前轴法兰盘的结构参数进行灵敏度分析,选出重要结构参数对前轴法兰盘进行尺寸优化。后支撑盘作为转子端部重要的支撑结构,其设计好坏直接影响气隙的平衡性,对后支撑盘进行尺寸优化,使其达到一定的刚强度要求。为提高由隔磁环、前轴法兰盘和后支撑盘组成的转子核心结构的一阶模态频率,对前轴法兰盘和后支撑盘加不同数量加强筋的方案进行对比分析,并选出最优方案,以提高转子核心结构的一阶模态频率。对内定子支撑盘进行结构优化,以降低其重量并提高其一阶模态频率。本文对兆瓦级直驱式双定子无刷双馈发电机的整体结构设计及结构优化进行了较为系统的研究,对大型风力发电机结构设计及结构优化具有重要的借鉴意义和工程实用价值。
[Abstract]:The shortage of fossil energy and the increasingly serious problem of environmental pollution promote the rapid development of new energy technology. Wind energy is getting more and more attention because of its rich resources, renewable, clean and pollution-free, and wind power generation is the most mature, large-scale and commercial development of all renewable energy utilization technologies. Wind power technology has developed rapidly. As a new type of alternator, double-stator brushless doubly-fed generator has the advantages of brushless reliability, direct-drive, small frequency conversion capacity, variable speed constant frequency and diversified operation mode. It has a broad application prospect in the field of wind power. In this paper, the 3MW double stator brushless doubly-fed generator is taken as the research object, the whole structure of the double-stator brushless doubly-fed generator is designed, and the important structure is optimized. The main work of this paper is as follows: firstly, based on the in-depth study of different wind turbine structures, the paper designs the whole structure of the double-stator brushless doubly-fed generator according to its particularity. Some important structures and structural connections are analyzed. Secondly, the structure of the isolated magnetic ring and the static axis are optimized. Based on the optimization of the size of the swallowtail slot, the size of the spacer ring is optimized to reduce the weight and the manufacturing cost. Because of the large size of the static shaft and the small force on the core structure of the solid static shaft, the hollow shaft structure is adopted and the size optimization analysis is carried out to make it meet the strength requirement. Finally, the structure of the front flange, the rear supporting disk and the inner stator supporting disk are optimized. Based on the topology optimization of the front flange, the sensitivity analysis of the structural parameters of the front flange is carried out, and the important structural parameters are selected to optimize the size of the front flange. As an important supporting structure at the end of the rotor, the design of the rear support disk directly affects the balance of the air gap. The size of the rear support disk is optimized to meet the rigid strength requirements. In order to improve the first order modal frequency of rotor core structure composed of magnetic ring, front shaft flange and rear support plate, the scheme of adding different amount of stiffeners to front shaft flange and rear support plate was compared and analyzed, and the optimum scheme was selected. In order to improve the first order modal frequency of rotor core structure. The structure of the inner stator support disk is optimized to reduce its weight and increase its first mode frequency. In this paper, the overall structure design and structural optimization of a megawatt type direct-drive double-stator brushless doubly-fed generator are studied systematically, which is of great significance and practical value for the structural design and optimization of large wind turbine.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM315

【参考文献】