基于直接转矩控制的单逆变器多机驱动系统的设计与实现

【作者】 吴韬；

【导师】 万衡； 李新育；

【作者基本信息】 华东理工大学 ， 控制工程， 2012， 硕士

【摘要】 在当今社会各领域的应用中,交流调速系统经过几十年的发展,已经逐步取代了传统的直流调速系统而成为主流选择。但在多种场合的大惯量、大功率调速系统中,传统的单逆变器拖动单电机控制方式已经不能满足相关的工作需求。而近年来新兴的单逆变器多机驱动系统与矢量控制的结合,在轨道交通领域已经被证明了具有运营成本低、运行性能优异、节能且高可靠性等特点。本文在借鉴已有的基于矢量控制的单逆变器多机驱动系统理论前提下,结合直接转矩控制的特点,提出了一种基于直接转矩控制的单逆变器多机驱动系统。该系统的主要创新在于针对同一系统中可能的不同型号或不同工作状态的异步电机,对其定子电流、定子磁链及转矩进行平均化处理。在所得的抽象化电机上施加直接转矩控制,从而达到使所有异步电机减少之间的相对误差,向同一工作趋势运行的目的。本文在完成对上述系统的理论推导的前提下,分别在Psim软件仿真平台和PE-V1EW9硬件平台下对基于矢量控制和基于直接转矩控制的单逆变器多机驱动系统进行了对比实验,结果反应两者具有相媲美的控制性能,也证实了直接转矩控制单逆变器多机驱动系统的初步可行性。更多还原

【Abstract】 With decades of development, the AC Drive system has taken the domain position of DC Drive system in many field of social application. But in some specific working condition, which would rise unique requirement such as large inertia or high power, the traditional single inverter-single motor control strategy can no longer meet the demands. Nowadays, the novel integration of single inverter-multi motor system and vector control in rail transport field has been proved to be an potential implication with high running performance, low costs, energy saving and high reliability.Referenced with existing theory, this paper has raised a new single inverter-multi motor system based on direct torque control. The innovation of system is that:when dealing with different type motors or motors in different working condition, it abstract an virtual motor that its stator current, stator flux and torque correspondingly equal to the average value of all working motor. Exerting the direct torque control on this virtual motor minimizes the relative deviation between motors and a certain operation tendency is realized for all the motors.On the base of theoretical derivation, this paper has developed comparison experiment between direct torque control and vector control for the same single inverter-multi motor system. The results from Psim simulation platform and PE-VIEW9 hardware platform have spontaneously shown that both control performances are comparable, which is also a proof for feasibility of the proposed system.更多还原