【作者】 王亚；

【导师】 程明；

【作者基本信息】 东南大学 ， 电气工程， 2015， 硕士

【摘要】 随着永磁同步电机(PMSM)牵引系统在城市轨道交通车辆中的广泛使用,对永磁同步电机牵引系统的可靠性提出了更高的要求。列车往往采用多台PMSM同时驱动来获得更大动力,单台逆变器只能驱动单台PMSM,当其中一台逆变器发生故障后,对应的牵引电机将停止工作,从而对整个牵引系统造成影响。因此,研究高可靠性的城市轨道交通永磁电机牵引系统就显得非常必要。本文以一种具有容错性能的永磁容错牵引模块作为研究对象,主要研究了永磁容错牵引模块在正常模式下以及容错模式下控制系统的脉宽调制策略。论文主要研究内容包括以下几个方面：1 阐述了本课题的研究背景和意义,对现代有轨列车的发展现状、永磁同步电机牵引系统的发展现状以及电机矢量控制系统脉宽调制策略的研究现状进行了介绍；2 介绍了一种具有容错性能的永磁容错牵引模块,给出了永磁容错牵引模块正常模式、隔离模式、容错模式下的拓扑结构。提出了模拟固定逆变器固定桥臂故障条件下的基于DSP的永磁容错牵引模块。分析了永磁同步电机的数学模型以及矢量控制的基本原理；3 介绍了传统空间矢量脉宽调制(Space Vector Pulse Width Modulation, SVPWM)算法的原理和数字实现过程,提出了一种快速最小占空比跟踪法(Fast Minimum Duty-cycle Point Tracking Method, FMDPT)。分别对基于SVPWM算法和基于FMDPT算法的永磁同步电机矢量控制系统进行了仿真研究。分别对基于SVPWM算法和基于FMDPT算法的永磁同步电机矢量控制系统进行了实验研究。以传统SVPWM算法作为参考,验证了所提FMDPT算法的正确性；4 提出了一种基于DSP的电机矢量控制系统脉宽调制策略代码段执行时间测量方法。在同一永磁同步电机矢量控制系统下,对SVPWM算法和FMDPT算法代码段的执行时间进行了测量,证明了FMDPT算法的执行效率更高。首次使用DSP28335作为控制器实现了五相占空比跟踪法在五相逆变器双三相永磁同步电机控制系统中的应用。使用DSP28335作为控制器,完成了城市轨道永磁电机牵引系统在正常模式、隔离模式和容错模式之间的切换；5 基于DSP28335搭建了城市轨道交通永磁电机牵引系统实验平台,设计了牵引系统的主电路和弱电控制电路,提出了一种永磁同步电机转子位置计算方法。更多还原

【Abstract】 With the wide application of the permanent-magnet traction system in urban rail trains, the reliability has been paid more attention. Several permanent-magnet synchronous machines are used together to obtain more traction effort, and one inverter only can feed one permanent-magnet synchronous machine (PMSM). When one inverter fails, the corresponding PMSM will be isolated from the traction system. As a result, the performances of the whole traction system will be influenced. Therefore, it is necessary to investigate a more reliable permanent-magnet traction system for urban rail transit.A fault-tolerant permanent magnet traction module (FTPMTM) is studied in this thesis, and the pulse width modulation(PWM) strategies of the control system for FTPMTM under normal and fault-tolerant mode are emphasized.The main research contents of this thesis are as follows.1 The background and the significance of this thesis are described. The development status of modern tram, permanent-magnet traction system and PWM strategy of motor vector control system are introduced.2 The FTPMTM is introduced in detial. The topologies under normal mode, isolation mode, and fault-tolerant mode are given. The DSP-based FTPMTM is proposed, which can simulate the fixed failed bridge arm with the fixed inverter.The mathematical model of PMSM and the principle of vector control are analyzed.3 The principle and implementation procedure of space vector pulse width modulation (SVPWM) algorithm are introduced, and the Fast Minimum Duty-cycle Point Tracking Method(FMDPT) algorithm is proposed. The simulations and experiments of both SVPWM and FMDPT are carried out and their results are compared. By comparing with SVPWM, the effectiveness of FMDPT is validated.4 A DSP-based method is proposed to measure the code execution time of PWM strategies for PMSM vector control system. Under the same conditions, the code execution time of SVPWM and FMDPT are measured by the proposed method. It is verified the code execution time of FMDPT is shorter. The five phase Minimum Duty-cycle Point Tracking (MDPT) method is firstly realized by DSP28335 in the five-inverter-two-PMSM system.By using DSP28335, the switches of the permanent-magnet traction system among normal mode, isolation mode and fault-tolerant mode are realized.5 Based on DSP28335, an experimental platform for the permanent-magnet traction system is developed. The main circuit and control circuit are designed. A method is proposed to calculate the value of PMSM’s rotor position.更多还原