模糊逻辑控制的异步电动机直接转矩控制系统

发布时间：2018-06-18 06:04

本文选题：直接转矩控制 + 模糊逻辑控制　；参考：《太原科技大学》2014年硕士论文

【摘要】：异步电动机是现代工业中重要的动力装置之一,其高性能调速和智能化控制已成为研究热点。交流电动机的调速技术,经历了转速开环恒压比控制、转差频率控制、磁场定向控制、直接转矩控制和智能控制等阶段。直接转矩控制在20世纪80年代提出以来,其因控制方式简洁直接、转矩响应快速等特点,提高了异步电机的动、静态性能,因而受到人们广泛关注。但由于传统直接转矩控制系统中转矩和磁链调节器采用滞环比较器,增大了逆变器开关频率,导致系统产生较大转矩脉动。在电动汽车驱动控制系统中传统DTC(Direct Torque Control)技术难以满足低开关损耗和良好转矩控制的要求。本文首先从理论基础出发,介绍了DTC系统基本模块理论知识,并对各模块展开理论分析,介绍各模块彼此之间的关系与影响,为后面章节的建模仿真准备充足的理论知识和理论依据。其次,本文利用Matlab/Simulink仿真软件模拟仿真电动汽车驱动控制系统中直接转矩控制系统的局部各模块。在此基础上搭建完整近似圆形磁链控制系统的仿真模型,并对仿真结果进行分析,得到电动汽车上应用的直接转矩控制技术,电动机转矩脉动大的事实依据。最后,依据模糊理论知识设计了模糊PI转矩调节器,搭建出基于模糊逻辑控制技术的直接转矩控制系统,对该系统和传统直接转矩控制系统相比较,得到转矩脉动减少的结论,验证了模糊逻辑控制的异步电动机直接转矩控制系统的优越性。
[Abstract]:Asynchronous motor is one of the most important power devices in modern industry. Its high performance speed regulation and intelligent control have become a research hotspot. The speed regulation technology of AC motor has gone through the stages of speed open loop constant voltage ratio control, slip frequency control, magnetic field oriented control, direct torque control and intelligent control. Since the direct torque control (DTC) was put forward in the 1980s, it has been paid more attention to because of its simple and direct control mode and fast torque response, which improves the dynamic and static performance of asynchronous motor. However, the hysteresis comparator is used in the traditional direct torque control system, which increases the switching frequency of the inverter and results in a large torque ripple. In the drive control system of electric vehicles, the traditional DTC Direct torque Control (DTC) technology is difficult to meet the requirements of low switching loss and good torque control. In this paper, the theoretical knowledge of the basic modules of DTC system is introduced based on the theoretical basis, and the theoretical analysis of each module is carried out, and the relationship and influence of each module is introduced. Sufficient theoretical knowledge and theoretical basis for the modeling and simulation of the following chapters are prepared. Secondly, this paper uses Matlab / Simulink simulation software to simulate the local modules of direct torque control system in electric vehicle drive control system. On this basis, the simulation model of the approximate circular flux control system is built, and the simulation results are analyzed. The direct torque control technology applied in electric vehicles and the fact basis of the large torque ripple of the motor are obtained. Finally, the fuzzy Pi torque regulator is designed according to the fuzzy theory knowledge, and the direct torque control system based on fuzzy logic control technology is built. Compared with the traditional direct torque control system, the conclusion of torque ripple reduction is obtained. The superiority of direct torque control system of asynchronous motor based on fuzzy logic control is verified.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM343

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