半集中式开绕组初级永磁直线电机牵引系统及其控制方法研究

城市轨道交通要求牵引系统具备宽调速能力。但是，永磁直线电机的大气隙、小电感特征使得弱磁扩速困难。开绕组拓扑结构被认为是一种较优的解决方案。然而，常规开绕组技术将会使得牵引变流器的使用数量翻倍，从而占用更多的车辆底部空间，增加列车自重、运行能耗、初期采购成本和后期维护成本，严重制约永磁直线电机牵引系统的推广应用。基于上述考虑，本项目在保留开绕组电机系统结构特点的基础上，突破传统线电压型桥臂复用技术的思维定式，首次提出采用相电压型桥臂复用技术的半集中式开绕组初级永磁直线电机牵引系统，在显著减少牵引变流器数量的条件下实现初级永磁直线电机牵引系统的开绕组、宽调速运行。本项目拟对所提牵引系统涉及的基本科学问题进行深入的理论分析和实验研究，建立较为完整的系统分析理论和设计方法，为未来初级永磁直线电机牵引系统在城市轨道交通领域的早日成功应用奠定坚实的理论基础和技术支撑。

The traction system for urban rail transit should have wide speed range. Due to the large air-gap width and small inductance, however, the flux-weakening control is difficult for the primary permanent-magnet linear motor (PPMLM). The open-end winding topology is considered as a preferred solution. However, double traction converters will be required by conventional open-end winding topology. As a result, more space under the motor cars is required, and the equipment weight, the consumed energy, the initial purchase cost and the late maintenance cost will be increased. Hence, the development of PPMLM traction system will be seriously affected. To solve this problem, a half-centralized open-end winding PPMLM traction system is firstly proposed in this project, which combines the structure features of both the open-end winding topology and the leg-sharing topology. It should be emphasized that the leg-sharing topology employed in the proposed traction system is firstly based on phase voltages instead of conventional line voltages. By using the proposed traction system, the open-end winding and wide speed operations of the PPMLM traction system can be realized while the number of traction converters is significantly reduced. In this project, some basic scientific problems related to the proposed traction system will be deeply investigated by theoretical analysis and experimental validation. Also, the complete system analysis theory and the corresponding design method will be developed. The theoretical and technological foundations will be provided for future applications of the PPMLM traction system in the field of urban rail transit.