【作者】 张鹏；

【导师】 欧阳红林；

【作者基本信息】 湖南大学 ， 控制科学与工程， 2011， 硕士

【摘要】 随着科学技术的发展,永磁同步电动机越来越受到了学者的推崇。相对感应电动机来说,永磁同步电动机具有结构紧凑、重量轻、功率密度高等优点,在机械制造、航空航天和电力牵引等领域得到广泛的应用。近20年来,随着高性能永磁材料的问世及电力电子技术的发展,以永磁同步电动机为动力核心的驱动系统己受到国内外的普遍重视。因此,对其控制系统的研究具有重要的理论和工程实际意义。本文首先介绍了永磁同步电动机驱动系统的研究现状和发展趋势；由矢量坐标变换理论出发,推导了永磁同步电动机dq0轴电压方程、磁链方程、转矩方程和它的数学模型,并以此为基础分析了永磁同步电机的基本控制方法。其次研究了永磁同步电机控制系统传统的直接转矩控制原理,确定了直接转矩控制系统中电压矢量的选择规则。仿真结果表明,传统的直接转矩控制虽然转矩响应快,但是,转矩和定子磁链都存在很大的脉动。为了解决传统永磁同步电机直接转矩控制中存在的磁链和转矩脉动较大的问题,本文采用了一种基于滑模变结构控制的永磁同步电机直接转矩控制策略,把传统的直接转矩控制方法中用到的两个滞环调节器分别用滑模控制器来代替,以期待解决转矩和定子磁链的脉动。文章最后给出了永磁同步电动机驱动系统详细的硬件结构电路、软件流程图和采样的实验波形,结果表明,所提出的这种新颖的滑模变结构控制方法不仅有效地减小传统直接转矩控制中存在的磁链和转矩脉动,而且还保持了直接转矩控制固有的转矩快速响应的特征和对系统参数摄动、外干扰具有鲁棒性强的优点,有效地改善了系统的动、静态运行性能。更多还原

【Abstract】 With the development of science and technology, Permanent magnet synchronous motor (PMSM) more and more respected by the scholars. PMSM has the excellence of compact structure, light weight, high power density compared with the induction motor, etc. Therefore PMSM is widely used in machinofacture, aerospace and electric traction. In recent20years, with the advent of high performance permanent magnet as well as the development of power electronics devices, drive system centering on PMSM is much accounted of at home and abroad. Therefore, study on the design of control system for PMSM has important theoretical and practical significance.First of all, this paper introduces the research status and develops future of PMSM drive system. According to vector coordinate conversion principle, the models of PMSM in the two-phase synchronous rotary coordinate (dqO) are deduced and obtained, and thus the basic control method of permanent magnet synchronous motor are analyzed.Secondly, the study of permanent magnet synchronous motor control system of the traditional principle of direct torque control (DTC), determining the voltage vector selection rules of DTC system. Simulation results show that although the conventional direct torque control has fast torque response, but the flux and torque ripple is relatively large. In order to solve the traditional direct torque control of permanent magnet synchronous motor that exists in a larger flux and torque ripple problem, a new variable structure sliding (VSS) mode control strategy was proposed in this paper.Two hysteresis regulators in the conventional DTC system were substituted by the flux and torque VSS controller respedtively, looking forward to solve the problem of torque and stator flux ripple.At last, the paper gives hardware circuits, soft flow and the experimental wave of the PMSM drive system. Experimental results verified that the proposed control scheme significantly reduces flux and torque ripple, preserves quickly dynamic torque response merit, and shows robust to motor parameter uncertainty, disturbance, which effectively improves dynamic and static operation performance.更多还原