宽转速运行多支路直驱永磁风力发电机系统研究
发布时间：2018-11-16 15:03
【摘要】：随着风电技术的进步,风电系统开始向高效率、大容量方向发展。对于直驱永磁同步风力发电系统,一方面,在保证变流器输出电压满足并网需求下,功率变流器较窄的调压范围直接限制风力机的转速范围,进而降低了风力机在宽风速范围的捕风效率;另一方面,功率变流器件的容量有限,会限制变流器容量,阻碍风力发电系统向更大容量发展。为了增加风力机宽风速范围的捕风效率和风电系统的单机容量,本文提出一种多直流支路串并组合切换的直驱永磁风电系统拓扑结构。此拓扑结构采用多支路结构降低各支路电流等级,扩展系统容量;支路串并组合形式可切换,在发电机低转速时增加串联的支路数、发电机高转速时降低串联的支路数,保证发电机在宽转速范围内变化时发电机的母线电压在较窄的范围内变化,提高了风力机在宽风速范围的捕风效率。本课题对多支路直驱永磁同步发电机进行设计,搭建了发电机ansoft有限元模型。综合了二极管的单向导通性和树形拓扑结构容错性,设计了一种可实现直流支路串并组合切换的拓扑结构。推导了采用串并组合切换结构所能扩展的发电机转速范围关系式,分析了转速范围连续性对发电机和母线电压变化范围的约束条件。利用matlab/simulink软件搭建系统仿真模型,仿真验证了支路串并连组合切换拓扑结构的实现支路切换和直流支路串并组合扩展发电机转速的可行性。搭建了多直流支路扩速实验平台进一步验证直流支路串并组合扩展发电机转速的可行性。
[Abstract]:With the progress of wind power technology, wind power system began to develop in the direction of high efficiency and large capacity. For direct-drive permanent magnet synchronous wind power generation system, on the one hand, under the condition that the output voltage of converter meets the demand of grid connection, the narrow voltage range of power converter directly limits the speed range of wind turbine. Furthermore, the wind capture efficiency of the wind turbine in the wide wind speed range is reduced. On the other hand, the limited capacity of power converter will limit the capacity of converter and hinder the development of wind power system to larger capacity. In order to increase the wind capture efficiency in the wide range of wind speed and the single unit capacity of wind power system, this paper presents a topology of direct-drive permanent magnet wind power system with multi-DC branch series and combined switching. This topology adopts multi-branch structure to reduce the current level of each branch and expand the system capacity. When the generator has low speed, the number of branches in series can be increased, and the number of branches in series can be reduced when the speed of generator is high. When the generator changes in the wide speed range, the generator bus voltage changes in a narrow range, which improves the wind capture efficiency of the wind turbine in the wide wind speed range. In this paper, the permanent magnet synchronous generator with multi-branch direct drive is designed, and the ansoft finite element model of generator is built. The unidirectional conduction and tree topology fault tolerance of the diodes are synthesised, and a topology structure is designed which can realize the combination switching of the DC branch series. The relationship between the range of generator speed and the continuity of speed range is derived, which can be extended by the series-parallel combined switching structure, and the constraints of the continuity of speed range on the range of generator and bus voltage are analyzed. The simulation model of the system is built by using matlab/simulink software, and the feasibility of branch switching and DC branch string combination combined expansion generator speed is verified by simulation. A multi-DC branch speed expansion experimental platform was built to further verify the feasibility of the DC branch series and combined expansion generator speed.
【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
本文编号：2335846
[Abstract]:With the progress of wind power technology, wind power system began to develop in the direction of high efficiency and large capacity. For direct-drive permanent magnet synchronous wind power generation system, on the one hand, under the condition that the output voltage of converter meets the demand of grid connection, the narrow voltage range of power converter directly limits the speed range of wind turbine. Furthermore, the wind capture efficiency of the wind turbine in the wide wind speed range is reduced. On the other hand, the limited capacity of power converter will limit the capacity of converter and hinder the development of wind power system to larger capacity. In order to increase the wind capture efficiency in the wide range of wind speed and the single unit capacity of wind power system, this paper presents a topology of direct-drive permanent magnet wind power system with multi-DC branch series and combined switching. This topology adopts multi-branch structure to reduce the current level of each branch and expand the system capacity. When the generator has low speed, the number of branches in series can be increased, and the number of branches in series can be reduced when the speed of generator is high. When the generator changes in the wide speed range, the generator bus voltage changes in a narrow range, which improves the wind capture efficiency of the wind turbine in the wide wind speed range. In this paper, the permanent magnet synchronous generator with multi-branch direct drive is designed, and the ansoft finite element model of generator is built. The unidirectional conduction and tree topology fault tolerance of the diodes are synthesised, and a topology structure is designed which can realize the combination switching of the DC branch series. The relationship between the range of generator speed and the continuity of speed range is derived, which can be extended by the series-parallel combined switching structure, and the constraints of the continuity of speed range on the range of generator and bus voltage are analyzed. The simulation model of the system is built by using matlab/simulink software, and the feasibility of branch switching and DC branch string combination combined expansion generator speed is verified by simulation. A multi-DC branch speed expansion experimental platform was built to further verify the feasibility of the DC branch series and combined expansion generator speed.
【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】
相关期刊论文 前10条
1 沈德昌;;海上风电机组发展趋势分析[J];风能;2012年12期
2 王仕韬;吕征宇;王鹿军;张德华;姚文熙;;永磁风力发电系统的变拓扑晶闸管整流器控制策略[J];电力系统自动化;2012年14期
3 郭越;王占坤;;中欧海上风电产业发展比较[J];中外能源;2011年03期
4 刘其辉;王志明;;双馈式变速恒频风力发电机的无功功率机制及特性研究[J];中国电机工程学报;2011年03期
5 赵争鸣;邹高域;;大容量电力电子应用系统及其关键问题综述[J];大功率变流技术;2010年02期
6 薛玉石;韩力;李辉;;直驱永磁同步风力发电机组研究现状与发展前景[J];电机与控制应用;2008年04期
7 卫蜀作;蔡悹;;中国电网高速发展与可再生能源发电的关系[J];电网技术;2008年05期
8 李建林;高志刚;赵斌;许洪华;;直驱型风电系统大容量Boost PFC拓扑及控制方法[J];电工技术学报;2008年01期
9 刘其辉;贺益康;张建华;;并网型交流励磁变速恒频风力发电系统控制研究[J];中国电机工程学报;2006年23期
10 李亚西 ,武鑫 ,赵斌 ,许洪华;世界风力发电现状及发展趋势[J];太阳能;2004年01期
，本文编号：2335846
本文链接：https://www.wllwen.com/kejilunwen/dianlidianqilunwen/2335846.html
