共查询到18条相似文献,搜索用时 46 毫秒
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针对感应电机高性能转矩跟踪控制和磁链难以直接测量问题,提出了基于无源性的转矩跟踪和自适应磁链观测器控制方案.首先基于感应电机的无源性特性设计了渐近稳定转矩跟踪控制器,重新配置了系统的平衡点,通过注入阻尼提高系统的收敛速度.然后通过将定子电流和转子磁链作为状态变量构建了自适应磁链观测器,简化了观测器结构,根据Lyapunov稳定性理论设计了自适应控制律,实现转子磁链、转速和定子电阻的在线估计.为减小转速估计误差对观测器的影响,给出了观测器增益矩阵的选择方法.仿真结果表明本文所提出的基于自适应观测器的无源控制方案能够有效提高感应电机的动静态性能. 相似文献
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本文提出了一种基于扰动观测器的自适应无源控制(perturbation observer-based adaptive passive control,POAPC),并将其用于增加电压源型多端高压直流输电系统(voltage source converter-based multi-terminal high voltage direct current,VSC–MTDC)的阻尼.首先定义一个扰动项,其包含多端口间的相互作用、未建模动态和未知时变外界干扰的综合效应.之后扩展一个虚拟状态来表征该扰动项,进而设计一个扰动观测器对其进行快速在线估计.该方法通过无源化向每个端口注入附加阻尼以改善系统暂态响应,并且不需要精确的系统模型或全局状态测量.基于四端VSC–MTDC系统的4种算例表明:与传统PI控制、无源控制以及基于扰动观察器的滑动模态控制相比,POAPC由于不需要精确系统模型及全局状态测量而具有更高的应用灵活性;在各种运行条件下通过有效减少有功功率P_1和无功功率Q_1控制误差和超调量来获得更优的控制性能;在系统参数不确定场景下将有功功率P_2的峰值变化从11%减少至接近0,鲁棒性更强. 相似文献
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应用无源性控制理论从能量角度研究了无刷双馈电机控制系统.建立了无刷双馈电机的欧拉方程,并将其分解为电气和机械两个无源子系统的反馈并联,以此说明在设计控制器时只需考虑电气子系统,简化了控制算法.设计了电机的转矩和转速控制器.在此基础上,考虑电机功率及控制绕组电阻在运行中可能发生变化.设计自适应控制器以提高系统的鲁棒性.仿真结果表明此控制策略能快速地跟踪速度给定.动静态响应能力较好,且具有全局稳定、系统鲁棒性好的特点. 相似文献
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一类非线性系统的自适应无源化控制 总被引:1,自引:0,他引:1
讨论了一类含未知参数的非线性系统的自适应无源化问题.通过引入切换拓宽可反馈无源化对象的范围,在控制项前面的系数是未知参数线性函数的条件下构造出自适应无源反馈规律.在该条件不满足时,基于无源性分析给出了鲁棒自适应控制器,可以保证闭环系统是全局渐近稳定的.仿真结果表明了所提出算法的有效性. 相似文献
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基于无源控制的PMSM无传感器方法研究 总被引:1,自引:0,他引:1
采用能量成形和互联、阻尼配置的无源性控制方法,完成了永磁同步电机的端口受控哈密顿系统(PCH)的建模和速度调节器的设计,证明了系统平衡点的稳定性。针对系统转速辨识问题,提出由脉振高频电压信号注入法和滑模自适应观测器法相结合的新型无速度传感器的复合方法。通过速度切换方案的设计,实现了两种方法间的平滑切换。解决了单一方法不能在全速度范围内同时兼顾良好的动态、稳态性能的问题,不仅节省了成本,还增强了整个系统的可靠性。仿真结果表明,该控制系统具有良好的动态、稳态性能。 相似文献
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自适应模糊滑模软切换的PMSM无速度传感器鲁棒无源控制 总被引:5,自引:0,他引:5
针对永磁同步电机(PMSM)转速调节和估计问题,提出一种无速度传感器的PMSM调速系统.利用双曲正切函数代替符号函数,设计了自适应模糊滑模软切换控制器,实现了软切换连续控制,削弱了抖动现象.通过设计鲁棒无源控制器,得到了旋转坐标系下的u_d和u_q.建立了自适应滑模观测器,并给出了速度辨识律,观测器的增益通过求解线性矩阵不等式得到.仿真结果表明了该控制策略与观测器配合的有效性,且控制系统具有良好的动、稳态性能. 相似文献
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Manuel A. Duarte‐Mermoud Juan C. Travieso‐Torres Ian S. Pelissier Humberto A. González 《Asian journal of control》2012,14(1):67-84
In this paper two new schemes for induction motor control are proposed and compared. Both approaches are based on the concept of adaptive passivity. First, a technique using the scheme of field oriented control (FOC) is proposed, and by means of an adaptive state feedback, a passive equivalent system is obtained. Furthermore, making use of the novel torque‐flux control principle (TFCP), the proposed scheme is greatly simplified. Second, a technique based on energy shaping approach, which does not make use of the FOC scheme, is proposed. The technique is based on interconnection and damping assignment (IDA) control transforming the original system into a passive one. Since this technique does not use the FOC scheme, it gives more flexibility in the implementation. Both techniques are then implemented at laboratory level and compared from experimental viewpoint using as benchmark the standard FOC scheme with PI controllers. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
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We propose a state‐feedback controller for switched‐reluctance motors as a preliminary step toward the solution of the sensorless control problem (without measurement of rotor variables). We establish global exponential stability. Furthermore, our controller renders the closed‐loop system robust to external disturbances, that is, input‐to‐state stable. Although there exist some works on sensorless control of switched‐reluctance motors, these consist mainly of ad hoc solutions without theoretical foundation. The few theoretically validated results in the literature are established under more stringent conditions such as knowledge of the load torque. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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提出一种结合滑模变结构和自适应观测技术的感应电机非线性控制新方法. 以定子电流与定子磁链为状态变量建立感应电机模型, 采用非线性分析方法建立转矩与磁链误差方程, 使用自适应滑模技术设计转矩与磁链控制器, 推导出定子电压控制量. 基于模型参考技术设计自适应观测器, 向控制器提供准确的转速辨识与磁链观测值,并给出了控制系统的稳定性证明. 该方法具有转矩脉动小、定子磁链畸变不明显的优点, 低速时也具有良好的控制性能, 且对参数与负载变化有较强的鲁棒性. 仿真与实验结果证明了该控制策略的正确性与有效性. 相似文献
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This paper deals with the vector control, including both the direct vector control(DVC) and the indirect vector control(Id VC),of induction motors. It is well known that the estimation of rotor flux plays a fundamental role in the DVC and the estimation of rotor resistance is vital in the slip compensation of the Id VC. In these estimations, the precision is significantly affected by the motor resistances. Therefore, online estimation of motor resistances is indispensable in practice.For a fast estimation of motor resistances, it is necessary to slow down the convergence rate of the current estimate. On the other hand, for a fast estimation of the rotor flux, it is necessary to speed up its convergence rate. It is very difficult to realize such a trade-off in convergence rates in a full order observer.In this paper, we propose to decouple the current observer from the flux observer so as to realize independent convergence rates. Then, the resistance estimation algorithm is applied to both DVC and Id VC. In particular, in the application to Id VC the flux observer needs not be used, which leads to a simpler structure. Meanwhile, independent convergence rates of current observer and flux observer yield an improved performance. A superior performance in the torque and flux responses in both cases is verified by numerous simulations. 相似文献
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This paper proposes a sliding‐mode linearization torque control (SMLTC) for an induction motor (IM). An ideal feedback linearization torque control method is firstly adopted in order to decouple the torque and flux amplitude of the IM. However, the system parameters are uncertainties, which will influence the control performance of the IM in practical applications. Hence, to increase the robustness of the IM drive for high‐ performance applications, this SMLTC aims to improve the immunity of those uncertainties. We modify the flux observer of Benchaib and Edwards [15] by means of the adaptive sliding‐mode method. This not only eliminates the estimation of the uncertainty bounds, but also improves the performance of sliding control. In addition, a practical application of the proposed SMLTC, with a model reference adaptive control (MRAC) scheme incorporated as the inner and outer loop controller used for position control, is also presented. Some experiments are presented to verify the control theory and demonstrate the robustness and effectiveness of the proposed SMLTC. 相似文献
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付晓辉 《计算技术与自动化》2009,28(4):20-23
根据永磁同步电机的矢量控制模型,设计一个滑模转速控制器,并设计一个自适应观测器估计负载转矩扰动值,进而对扰动进行在线补偿。滑模控制器与传统PID控制相比具有超调量小、响应快的优点.负载观测器的补偿提高了系统的性能。MATLAB仿真结果证明该设计方法的有效性。 相似文献
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Target manipulation inside a deformable object by a robotic system is necessary in many medical and industrial applications. However, this is a challenging problem because of the difficulty of imposing the motion of the internal target point by a finite number actuation points located at the boundary of the deformable object. In this work, an optimal contact formulation and a control action are presented, in which a deformable object is externally manipulated with multiple robotic fingers such that an internal target point is positioned to a desired location. First, we formulate an optimization technique that minimizes the total force applied to the object to determine the location of actuation points to affect the desired motion. Then, a passivity-based control approach, based on energy monitoring and dissipation, is developed to improve stability of the whole system. The simulation results demonstrate the efficacy of the proposed method. 相似文献
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In this article, a sensorless output feedback controller is designed in order to drive the induction motor (IM) without the use of flux and speed sensors. First, an observer that uses only the measured stator currents is synthesised to estimate the mechanical variables (speed and load torque) and the magnetic variables (fluxes) by structurally taking into account the unobservability phenomena of the sensorless IM (SIM) and the parametric uncertainties. Second, a current-based field-oriented sliding mode control that uses the flux and the speed estimates given by the former observer is developed so as to steer the estimated speed and flux magnitude to the desired references. Since the observer error dynamic is independent from the known input control and depends on the IM parametric uncertainties, a kind of separation principle is introduced to guarantee the practical stability of the whole closed-loop system ‘observer–controller’ (‘O-C’) according to observability and unobservability time variation. A significant benchmark taking into account the unobservability phenomena of the SIM is presented to show the performances of the whole control scheme against experimental set-up. 相似文献