共查询到20条相似文献,搜索用时 15 毫秒
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《Industry Applications, IEEE Transactions on》2008,44(6):1732-1740
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介绍了一种拓扑结构与众不同的矩阵变换器--间接式矩阵变换器,并将其应用于感应电机矢量控制系统.在详细介绍间接式矩阵变换器的工作原理、控制策略及换流方法的基础上,将间接式矩阵变换器与感应电机矢量控制理论相结合,提出一种新颖的感应电机矢量控制系统.该系统在实现对电机矢量控制的同时,能够实现能量的双向传递,减少电网的谐波污染,同时又可以使电网侧的双向开关在零电流时动作,无需采用四步换流策略,由此降低了控制过程的复杂性.最后,利用Matlab软件对所提系统进行仿真,仿真结果验证了该系统的可行性. 相似文献
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针对无速度传感器异步电机矢量控制系统,为了提高系统对电机参数变化和转矩扰动的鲁棒性,提出一种基于自适应观测器的鲁棒控制策略。研究了一种改进全阶自适应状态观测器设计方法,将静止坐标系下状态观测误差系统变换到同步旋转坐标系以克服系统的复杂非线性,通过分析单输入单输出误差系统获得了观测器稳定条件,并采用一种增强型定子电阻自适应率以降低观测器对电机参数变化的敏感性。为了提高异步电机磁场定向控制系统的抗负载转矩扰动能力,在分析扰动转矩对控制系统动态模型影响基础上,提出了一种自适应扰动转矩前馈补偿控制策略。通过11kW无速度传感器异步电机矢量控制系统进行实验,实验结果验证了所提出方法的有效性。 相似文献
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Bojoi R. Guglielmi P. Pellegrino G.-M. 《Industry Applications, IEEE Transactions on》2008,44(2):475-481
A sensorless direct rotor field-oriented control (SDRFOC) scheme of three-phase induction motors for low-cost applications is presented in this paper. The SDRFOC algorithm is based on a sensorless closed-loop rotor flux observer whose main advantages are simplicity and robustness to motor parameter detuning. The whole algorithm has been developed and implemented on a low-cost fixed-point digital signal processor controller. Experimental results are presented for a 0.5-kW induction motor drive for a primary vacuum pump used in industry applications. 相似文献
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异步电动机转子磁场定向偏差解耦控制系统的研究 总被引:2,自引:0,他引:2
对异步电动机转子磁场定向电压解耦型控制系统进行了研究 ,提出了一种异步电动机的偏差解耦控制方法 ,并研讨了它的控制特点、影响电动机解耦的因素及系统进入方波工况时转矩的快速调节问题。理论分析和实验表明所述系统方案可行 ,为大功率矢量控制系统提出一种可用方案。 相似文献
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Plunkett Allan B. D'Atre John D. Lipo Thomas A. 《Industry Applications, IEEE Transactions on》1979,(4):430-437
Conventional methods of controlling an induction motor utilize regulation of stator current and motor slip frequency in order to maintain system stability. This control strategy requires a shaft speed feedback and fast-response current regulation. An alternative method of controlling an induction motor is presented which achieves the necessary system stabilization by controlling only the motor frequency. The control inherently regulates the motor torque angle by properly adjusting the phase of the converter firing signals. By synchronizing the inverter firing pulses to the motor back electromotive force (EMF) possible adverse inverter operating modes are avoided. The concept of synchronous control eliminates the preprogrammed functional relations previously required and allows the control to adapt to any desired motor flux level. Any desired outer regulating loop can be incorporated to form a fast-response wide-range ac drive system. 相似文献
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提出一种基于定子电流误差的间接定子磁场定向矫正控制方法。分析了定子dq轴电流以及定子磁链的关系,推算出q轴电流对定子磁场的去磁分量,在负载变化时加大d轴电流补偿该分量,实现定子电流dq轴分量的分解。采用了磁链开环的矢量控制,避免了传统磁场定向矢量控制在低速时磁场观测的复杂性和不准确性。然而为保证磁场定向的准确性,提出了基于定子电流误差的磁场定向矫正方法,通过分析磁场定向的超前和滞后时dq轴给定电流和反馈电流的关系,补偿到q轴电流,进而改变转差来弥补磁场定向不准带来的误差。最后,搭建了异步电机Matlab仿真模型和实验平台,结果表明,磁场定向在稳态运行和电机参数变化时有良好的矫正效果,保证控制系统的静、动态性能。 相似文献
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本文扼要介绍了永磁同步电机矢量控制原理,以及永磁同步伺服系统的构成、控制与性能。详细阐述了伺服系统制动过程中电机所处的运行状态,即减流阶段、反接建流阶段、回馈发电制动阶段、反接制动阶段(或者速度调整阶段)。仔细研究了系统制动过程中,各阶段电机电流、电压、速度的变化规律,分析了影响制动过程的各种因数、提高电机制动响应性能、抑制速度超调的措施,以及系统设计、调整和构成中需要注意的方面。文章还分析了电机制动时回馈的能量和直流側母线电压的变化,以及电压变化对系统的影响。仿真和实验证实了文中所做的分析。 相似文献
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A tuning procedure for high-performance (e.g., axis feed type) applications of feedforward field-oriented controllers is developed and demonstrated. The theoretical basis of the procedure is explained via a novel form of dq vector diagram. This diagram displays both steady and transient states simultaneously. This format also provides substantial insight into the expected behavior of mistuned controllers, especially for analyzing transient torque performance. The procedure is unambiguous to implement, and it requires no additional sensors beyond those required for the feedforward controller. 相似文献
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A new algorithm using a single dc-link current sensor to reconstruct all three inverter phase currents has been proposed that overcomes problems caused by the presence of regions in the voltage vector plane where the phase currents are not conveniently measurable. The measurement vector insertion method (MVIM) achieves this objective by applying additional active voltage vectors for brief intervals only when needed during each fundamental frequency cycle. This paper addresses techniques for incorporating the MVIM algorithm into a closed-loop current regulator designed to provide high-quality current control using a single dc-link current sensor. Virtual active resistance state feedback is introduced into the synchronous-frame current regulator in order to improve the controller's ability to reject disturbances caused by the MVIM measurement vectors. Experimental results are provided to confirm the attractive performance characteristics of the resulting current reconstruction and regulation using the MVIM algorithm 相似文献
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单相交流力矩电机广泛应用卷绕、堵转和调速等控制.使用环境越来越复杂,在很多地方需要在远程的操作台来控制单相交流力矩电机,文章给出了一种基于PWM技术的单相交流力矩电机的远程控制方法,并给出了力矩电机的远程控制框图,具有一定实用价值. 相似文献
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简要介绍有关接触器和起动器新国家标准的基本内容,并对GB14048.4的编制及与国内老标准JB2455等、与IEC947-4-1等的主要差异作出说明,就国内现有产品及正在开发的新产品如何达标提出建议. 相似文献