共查询到20条相似文献,搜索用时 46 毫秒
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基于全阶磁链观测器的间接转矩控制研究 总被引:1,自引:0,他引:1
介绍了间接转矩控制的基本原理,提出了基于单神经元PID的动态位角调节器来改善转矩脉动响应的方法,建立了一种能同时准确观测定子磁链和转子磁链的新型全阶磁链观测器,通过引入弱磁控制算法,将间接转矩控制扩展到全速度区范围.仿真实验结果表明,定子磁链轨迹为圆形,转矩脉动小,动态响应快,开关频率恒定,证明了该方案是可行的,并且具有良好的动静态性能. 相似文献
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A method for estimating the rotor flux and speed of an induction motor based on adaptive control theory is presented. The method is applied to a direct field-oriented induction motor control without speed sensors. The influence of the parameter variation on the speed estimation can be removed by the proposed parameter adaptive scheme. The validity of the adaptive flux observer is verified experimentally 相似文献
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A method for the deadbeat flux level control of direct-field-oriented high-power induction servo motor drives has been developed that employs an adaptive rotor flux observer. The observer is a full-order type and is used not only in the direct-field-oriented controller, but also to determine the stator and rotor resistances of the servo motor. The observer reduces the sensitivity of a deadbeat controller to fluctuations in the motor parameters. The main advantage of this method is that it improves the efficiency of an induction servo motor without sacrificing dynamic performance. This paper describes the method as well as the fundamental characteristics of the system derived from experimental and simulation results 相似文献
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A. Mezouar M. K. Fellah S. Hadjeri 《Electrical Engineering (Archiv fur Elektrotechnik)》2007,89(3):193-203
This paper proposes a sequential methodology for designing a robust adaptive sliding mode observer for an induction motor
drive using a two-time-scale approach. This approach is based on the singular perturbation theory. The two-time-scale decomposition
of the original system of the observer error dynamics into separate slow and fast subsystems permits a simple design and sequential
determination of the observer gains. In the proposed method, the stator currents and rotor flux are observed on the stationary
reference frame using the sliding mode concept. The control algorithm is based on the indirect field oriented sliding mode
control with an on-line adaptation of the rotor resistance to keep the machine field oriented. The control–observer scheme
seeks to provide an asymptotic tracking of speed and rotor flux in spite of the presence of an uncertain load torque and an
unknown value of rotor resistance. The validity for practical implementation has been verified through computer simulations. 相似文献
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基于电压电流模型的闭环磁链观测器在无速度传感器感应电机矢量控制中获得了良好的控制性能,且具有较小的参数敏感性,但在低速发电模式下存在部分不稳定区域,导致电机在该区域不能正常运行.根据对该闭环磁链观测器稳定性分析及其对应不稳定区域条件,本文提出了一种改进方法使之能够在在低速发电模式下稳定运行.仿真和实验都证明了该改进方法的有效性和实用性. 相似文献
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矩阵变换器驱动感应电机转矩和转子磁链控制 总被引:1,自引:0,他引:1
提出了一种新型的基于感应电机状态方程的矩阵变换器驱动感应电机直接转矩和转子磁链控制方法,将传统直接转矩中的定子磁链控制替换为转子磁链控制,可以得到比传统直接转矩更高的输出转矩.将滑模变结构控制策略引入到矩阵变换器驱动感应电机直接转矩和转子磁链控制中,设计了基于加速度型趋近律的控制律,并直接在静止坐标系下进行运算,不需要传统控制中的坐标变换,采用光滑函数代替常规符号函数,从而达到快速趋近滑模面且具有低抖动的效果.结合矩阵变换器双空间矢量调制方法,并将矩阵变换器过调制方法用于感应电机直接转矩控制中,达到矩阵变换器开关频率恒定和电机快速转矩响应的目的.实验结果验证了该方法的正确性和有效性. 相似文献
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实现矢量控制的基础是准确获得转速和转子磁链信息,本文提出了一种基于二阶滑模观测器的转子磁链观测方法。将构造的滑模观测器作为模型参考自适应系统(MRAS)的参考模型,将磁链的电流模型改造为该中间变量的可调模型,且其可调量为转速变量,进而构造出MRAS,实现对转速的观测。在此基础上,完成转子磁链的计算,并得到转子磁链角度,实现基于直接磁场定向的感应电机矢量控制。中间量的构造有效避免了传统MRAS中的纯积分问题,便于算法的实施;二阶滑模观测器有效地削弱了一阶滑模观测器存在的抖振扰动,并且参数具有较强的鲁棒性。仿真结果表明该转子磁链观测器具有较高的观测精度,且对外部扰动和转子电阻变化具有较强的鲁棒性,提高了系统的动稳态性能。 相似文献
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为提高电机磁链观测器的观测性能,实现磁链的准确观测,提出一种RBF神经网络定子磁链观测器.采用RBF神经网络重构基于电压模型的带幅值和相位补偿的变截止频率定子磁链观测器,使磁链观测器的截止频率能跟随电机定子电信号频率的变化而变化.RBF神经网络磁链观测器实现了变截止频率,结构简单,自适应能力强,无直流偏移和初始相位问题... 相似文献
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Jose Guadalupe Romero Romeo Ortega Zhaoqiang Han Thomas Devos François Malrait 《International Journal of Adaptive Control and Signal Processing》2016,30(3):473-487
A gradient descent‐based nonlinear observer for surface‐mount permanent magnet synchronous motors with remarkable stability properties was recently proposed. A key assumption for the derivation of the observer is the knowledge of the electrical parameters, which are usually uncertain. In the present paper, we propose a robust adaptive flux observer adding immersion and invariance parameter adaptation algorithms to estimate the stator resistance. Global boundedness of all signals and convergence to a residual set of the flux estimation error is guaranteed. The performance of the new adaptive observer is assessed with realistic simulations. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献