共查询到20条相似文献,搜索用时 843 毫秒
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A sensorless induction motor drive is presented, in which the principles of sliding-mode control, direct torque control (DTC), and space-vector modulation are combined to ensure high-performance operation, both in the steady state and under transient conditions. Merits of the classic DTC transient behavior are preserved, while the steady-state operation is significantly improved. The torque and flux controllers, and motor state observer are of the sliding-mode type. The inverter is directly controlled on the basis of torque and flux errors, using space-vector pulsewidth modulation. Computer simulations and experimental results presented demonstrate the robustness, accuracy, quickness, and low-chattering, wide-speed-range operation of the drive. 相似文献
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交流永磁直线伺服系统的神经网络--滑模双自由度控制 总被引:8,自引:0,他引:8
文章针对直接驱动的交流永磁直线伺服系统,提出一种将非线性神经网络控制和滑模控制相结合构成的双自由度控制策略。该控制策略解决了直线伺服系统跟踪性能的鲁棒性能之间的矛盾。采用滑模控制方法设计输入控制器,保证系统对给定的快速跟踪性能;输出反馈控制器采用神经网络来实现,对系统参数变化和阻力扰动(包括直线电机端部效应引起的推力波动)进行很大程度的抑制。并可以消除扰动引起的滑模控制抖振对系统稳态性能的影响。同时,滑模控制的快速性又能大大加快神经网络的收敛速度。仿真实验结果表明该方案在保证伺服系统的快速性同时,对系统参数变化和阻力扰动具有很强的鲁棒性,大大提高了直接驱动系统的伺服精度。 相似文献
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基于滑模变结构矢量控制的异步电机调速 总被引:1,自引:0,他引:1
针对异步电机矢量控制系统因电机参数变化和负载波动等因素使调速性能变差的问题,在转差频率控制的异步电机矢量控制系统的基础上,用两个滑模变结构控制器代替传统的PI控制器分别控制d轴和q轴的电流,并采用电压空间矢量技术来调节电机的输入电压,达到调速的目的。仿真结果说明,所提的控制方式与传统的PI控制方式相比较,具有响应速度快、控制精度高,对负载波动和电机参数变化具有较强的鲁棒性。 相似文献
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针对异步电机矢量控制系统因电机参数变化和负载波动等因素使调速性能变差的问题,在转差频率控制的异步电机矢量控制系统的基础上,用两个滑模变结构控制器代替传统的PI控制器分别控制d轴和q轴的电流,并采用电压空间矢量技术来调节电机的输入电压,达到调速的目的.仿真结果说明,文中所提出的控制方式与传统的PI控制方式相比较,具有响应速度快,控制精度高,对负载波动和电机参数变化具有较强的鲁棒性. 相似文献
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基于神经网络给定补偿的交流永磁直线伺服系统滑模控制 总被引:22,自引:3,他引:22
针对直接驱动的永磁直线同步电动机 (PMLSM )伺服系统 ,应用滑模变结构控制理论设计了一种具有强鲁棒性的速度控制器。为使系统具有自学习能力 ,削弱滑模控制所引起的“抖振” ,采用基于神经网络前馈给定补偿的滑模控制策略。仿真结果表明 ,该方案有效地克服了永磁直线同步电机特有的端部效应所产生的推力波动对系统的影响 ,对参数变化及阻力扰动具有很强的鲁棒性 ,而且提高了系统的稳态性能 相似文献
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Direct torque control (DTC) is known to produce quick and robust response in AC drives. However, during steady state, notable torque, flux and current pulsations occur. They are reflected in speed estimation, speed response, and also in increased acoustical noise. This paper introduces a new direct torque and flux control based on space-vector modulation (DTC-SVM) for induction motor sensorless drives. It is able to reduce the acoustical noise, the torque, flux, current, and speed pulsations during steady state. The DTC transient merits are preserved, while better quality steady-state performance is produced in sensorless implementation for a wide speed range. The flux and torque estimator is presented and an improved voltage-current model speed observer is introduced. The proposed control topologies, simulations, implementation data, and test results with DTC and DTC-SVM are given and discussed. It is concluded that the proposed control topology produces better results for steady-state operation than the classical DTC 相似文献
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针对永磁同步电机转速控制系统,运用矢量控制技术,并采用快速动态滑模控制方法分别设计了电机的速度和电流控制器,通过李亚普诺夫稳定性理论证明了系统的稳定性。设计控制器时将滑模控制中的不连续项转移到控制量的一阶导数中,从而能有效降低系统抖振;采用快速终端滑模的思想设计了滑模趋近律,从而可使系统快速收敛。结合永磁同步电机驱动的连铸结晶器正弦/非正弦振动控制系统对电机转速为恒值或变角速度的实际要求,对电机速度控制系统进行了仿真。仿真结果表明,电机角速度能快速跟踪给定的恒值或时变角速度信号,控制量的抖振得到了有效抑制,系统对负载扰动具有良好的鲁棒性。 相似文献
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永磁同步电机交流伺服系统的滑模模糊控制 总被引:3,自引:0,他引:3
针对模糊控制器在设计过程中参数难以确定以及滑模控制存在抖动等问题,将滑模控制理论与模糊控制理论相结合,提出了一种基于Sugeno型模糊推理的滑模模糊控制器的设计方法。使每一条Sugeno型模糊推理规则的后件部分为一滑模控制策略,保证了模糊控制系统的稳定性和动态性能。将该方法用于永磁同步电机交流伺服系统位置控制器的设计,并进行了仿真。结果表明,该方法综合了传统的滑模控制和模糊控制的优点,具有很好的动态跟随性和较强的鲁棒性,有效地削弱了抖动。 相似文献
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针对异步电机无速度传感器中存在的对参数变化鲁棒性差的问题,研究了一种基于自适应滑模观测器的异步电机无速度传感器的矢量控制方案。自适应滑模观测器根据电机静止坐标系下的数学模型构造了转子磁链观测器,定子电流观测值与实际值的误差构成观测器的滑模面,在滑模运动下该观测器的观测值最终趋近于实际值,从而实现转子磁链的估计。电机转速由自适应方法估算得到,滑模观测器的稳定性可由李雅普诺夫稳定性证明。与其他方案相比,该方法的优点在于实现简单,对参数变化具有鲁棒性。仿真和实验对控制方案的正确性和可行性给出了验证,该观测器可以实现对转子磁链和转速的观测,且在负载扰动和给定转速变化的情况下该滑模观测器具有鲁棒性。 相似文献
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Abstract—The control performance of AC electric drives is sensitive to and often degrades with parametric variations. This article proposes the use of fractional-order controllers to combat parameter variations. The speed control of an AC induction motor drive achieved through indirect field-oriented control is considered for illustration. The performance of the proposed controller is compared with a well-tuned proportional-integral controller when critical motor parameters are subject to parametric variations about their nominal values. Dynamic simulations in MATLAB/Simulink (The Math Works, Natick, Massachusetts, USA) are conducted to assess control performance. 相似文献
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This paper presents a robust speed controller for field oriented controlled interior permanent magnet synchronous motor (IPMSM)
drives. The proposed controller is designed using integral variable structure control (IVSC) combined with linear quadratic
regulator (LQR). The LQR scheme is used to decide the optimal feedback gain to shape the system dynamics by tuning the IVSC
switching plane to guarantee the robustness of the control algorithm. The complete drive is implemented in real-time using
digital signal processor (DSP) control board DS1102. The tracking properties and robustness of the proposed scheme are examined
through both simulations and experimental work. It guarantees accurate control performance in the presence of parameter variations,
step speed change and load disturbances. The performance of IPMSM drive system with a conventional proportional-integral (PI)
controller is presented in comparison with the proposed controller. The results show a significant improvement in both the
transient and steady state responses over the conventional PI controller. 相似文献
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ABSTRACT This paper describes the dynamic performance of a new, modified sliding mode (MSM), speed control system for an existing current-controlled field-oriented induction motor drive with rather robust rotor flux estimator. Extensive digital simulations and some test results prove the superiority of IBM versus PI in terms of reduced speed overshooting, response quickness, and robustness to rotor resistance variation. The rotor flux estimator amplitude and phase error during severe transients has also been investigated through digital simulations. 相似文献