节点文献
永磁同步电机直接转矩控制技术的研究
Research on Permanent Magnet Synchronous Motor Direct Torque Control Technology
【作者】 李建超；
【导师】 国海峰；
【作者基本信息】 哈尔滨工业大学 ， 电气工程， 2007， 硕士
【摘要】 直接转矩控制是继矢量控制之后发展起来的又一种高性能交流调速技术。直接转矩控制策略因其具有转矩控制直接、动态响应较快、算法相对简单等优点在交流电机调速领域得到越来越多的关注。随着对永磁同步电机研究的深入,直接转矩控制策略在永磁同步电机的控制领域逐步得到应用。本文主要针对永磁同步电机的直接转矩控制技术进行深入研究。为了准确分析直接转矩控制原理,需要对控制对象进行数学分析。为此,本文首先从永磁同步电机的结构出发,分析了永磁同步电机的工作原理,进而建立了永磁同步电机在不同参考坐标系下的数学模型。深入分析了直接转矩控制的控制思想,对基于Bang-Bang滞环控制的传统方式进行了研究,分析了空间电压矢量对定子磁链和电磁转矩的影响。针对传统控制方式存在的缺点,本文将空间矢量脉宽调制技术引入永磁同步电机的直接转矩控制系统中,以解决传统直接转矩控制方式中磁链、转矩波动大的问题,给出了定子磁链和电磁转矩协调控制的改进算法。借助Matlab6.5/Simulink工具对永磁同步电机的传统直接转矩控制系统和基于SVPWM的直接转矩控制系统各子环节进行建模设计,建立了两种控制策略的仿真模型。模拟实际的控制系统进行了仿真研究,得到了与理论分析相一致的实验结果。全数字化是电机控制的发展趋势。本文设计了以TI公司的电机专用控制芯片TMS320LF2407A为核心的永磁同步电机直接转矩控制系统的实验平台,给出了系统软硬件实现的具体方法,对系统进行了实验研究,给出了主要的实验结果。实验结果表明,控制系统设计合理,具有较高的动静态性能。
【Abstract】 Direct torque control (DTC) is a new high-performance AC drive technology following vector control. More attention is paid to DTC in AC motor speed control area because of its advantages such as fast dynamic response,relatively simple algorithm and so on. With deep study of permanent magnet synchronous motor (PMSM), DTC strategy is applied gradually in PMSM control area. This paper is aimed at studying DTC technology deeply for PMSM.In order to make an accurate analysis for the principle of DTC, mathematical analysis of motors to be controlled is essential. So the operational principle of PMSM is analyzed firstly based on its structure in this paper, then mathematical models of PMSM are established under different reference coordinate systems.After that, the theory of DTC is studied deeply and traditional control system based on Bang-Bang mode is researched. The effects of space voltage vectors towards stator flux and electromagnetic torque are also analyzed. Due to existent disadvantages of traditional DTC mode, Space Vector Pulse Width Modulation is brought into PMSM DTC system in order to resolve the problems such as remarkable fluctuations of flux and torque. Moreover, the improved algorithm is griven for the harmonious control of stator flux and electromagenic torque.With Matlab6.5/Simulink the subsystems of traditional DTC system and SVPWM DTC system for PMSM are modeled and designed. Then the simulation models of the above two control strategies are also established. Iimitating actual control systems, simulation research is conducted and the experimental results are corresponding with theory analysis.The trend of motor control is total digitalization. In this paper, experimental platform for PMSM DTC system is designed baesd on TMS320LF2407A, and then concrete realization methods of software and hardware are shown. After experimental research, main experimental results are listed. The results prove that the control system is designed logically with high dynamic and static performance.