The boost converter feeding a constant power load (CPL) is a non-minimum phase system that is prone to the destabilizing effects of the negative incremental resistance of the CPL and presents a major challenge in the ...The boost converter feeding a constant power load (CPL) is a non-minimum phase system that is prone to the destabilizing effects of the negative incremental resistance of the CPL and presents a major challenge in the design of stabilizing controllers. A PWM-based current-sensorless robust sliding mode controller is developed that requires only the measurement of the output voltage. An extended state observer is developed to estimate a lumped uncertainty signal that comprises the uncertain load power and the input voltage, the converter parasitics, the component uncertainties and the estimation of the derivative of the output voltage needed in the implementation of the controller. A linear sliding surface is used to derive the controller, which is simple in its design and yet exhibits excellent features in terms of robustness to external disturbances, parameter uncertainties, and parasitics despite the absence of the inductor’s current feedback. The robustness of the controller is validated by computer simulations.展开更多
This paper presents a backstepping control method for speed sensorless permanent magnet synchronous motor based on slide model observer. First, a comprehensive dynamical model of the permanent magnet synchronous motor...This paper presents a backstepping control method for speed sensorless permanent magnet synchronous motor based on slide model observer. First, a comprehensive dynamical model of the permanent magnet synchronous motor(PMSM) in d-q frame and its space-state equation are established. The slide model control method is used to estimate the electromotive force of PMSM under static frame, while the position of rotor and its actual speed are estimated by using phase loop lock(PLL) method. Next,using Lyapunov stability theorem, the asymptotical stability condition of the slide model observer is presented. Furthermore, based on the backstepping control theory, the PMSM rotor speed and current tracking backstepping controllers are designed, because such controllers display excellent speed tracking and anti-disturbance performance. Finally, Matlab simulation results show that the slide model observer can not only estimate the rotor position and speed of the PMSM accurately, but also ensure the asymptotical stability of the system and effective adjustment of rotor speed and current.展开更多
Because brushless direct current(BLDC) motors have the advantages of a compact size, high power density, high efficiency, and long operating life time, they are widely used in many industrial products and electric tra...Because brushless direct current(BLDC) motors have the advantages of a compact size, high power density, high efficiency, and long operating life time, they are widely used in many industrial products and electric traction systems. It is known that the BLDC motors have no brushes for commutation. They are commutated with electronically commutation. So, the rotor position information of the BLDC motors must be known to understand which winding will be energized according to the energizing sequence. In most of the existing BLDC motor drivers, rotor position information is detected by Hall effect sensors. This kind of mechanical position sensors will bring additional connections and costs, reliability decrease and noise increase. In order to improve the control performance and extend the range of speed regulation for BLDC motors, a position sensorless control method is proposed in this paper. In the proposed control method, rotor position information of the BLDC motors is detected from the back electromagnetic forces(back-EMFs) which are estimated by an unknown-input observer with line to line currents and line to line voltages. For the purpose of verifying the effectiveness of the proposed control method, a model is built and simulated on the Matlab/Simulink platform. The simulation results show that the speed regulation performance of BLDC motors is improved compared with using Hall effect sensors. At the same time, the reliability of the BLDC motors is improved and the costs of them are reduced because the position sensor is eliminated.展开更多
针对传统无刷直流电机(brushless direct current motor, BLDCM)无位置传感器控制在低速起动阶段由于反电动势幅值较小导致换相信号精度下降,进而引发换相失败的问题,本文提出了一种基于河马算法优化BP神经网络的无感控制方法。该方法...针对传统无刷直流电机(brushless direct current motor, BLDCM)无位置传感器控制在低速起动阶段由于反电动势幅值较小导致换相信号精度下降,进而引发换相失败的问题,本文提出了一种基于河马算法优化BP神经网络的无感控制方法。该方法以电机三相电压与电流信号为输入,构建非线性映射模型,实现对电机精确换相信号的估算。仿真结果表明,本文提出的基于河马优化算法的BP神经网络无位置传感器控制策略在无刷直流电机系统中表现出良好的性能。能够实现准确的换向信号估计,具备快速、平稳的调速特性,系统动态响应良好。展开更多
无刷直流电机(Brushless DC Motor,BLDCM)作为一种高效、节能的电机类型,在石油、化工、交通等各领域得到了广泛应用。无位置传感器控制技术作为无刷直流电机控制的重要分支,通过检测电机反电动势或相电流等信息,实现电机的换相控制,无...无刷直流电机(Brushless DC Motor,BLDCM)作为一种高效、节能的电机类型,在石油、化工、交通等各领域得到了广泛应用。无位置传感器控制技术作为无刷直流电机控制的重要分支,通过检测电机反电动势或相电流等信息,实现电机的换相控制,无需额外的位置传感器,从而降低了系统成本,提高了系统可靠性。现通过分析无刷直流电机无位置传感器控制技术的研究现状,论证了现有方法的优缺点,并探讨了未来的发展方向。展开更多
文摘The boost converter feeding a constant power load (CPL) is a non-minimum phase system that is prone to the destabilizing effects of the negative incremental resistance of the CPL and presents a major challenge in the design of stabilizing controllers. A PWM-based current-sensorless robust sliding mode controller is developed that requires only the measurement of the output voltage. An extended state observer is developed to estimate a lumped uncertainty signal that comprises the uncertain load power and the input voltage, the converter parasitics, the component uncertainties and the estimation of the derivative of the output voltage needed in the implementation of the controller. A linear sliding surface is used to derive the controller, which is simple in its design and yet exhibits excellent features in terms of robustness to external disturbances, parameter uncertainties, and parasitics despite the absence of the inductor’s current feedback. The robustness of the controller is validated by computer simulations.
基金supported by National Natural Science Foundation of China(Nos.61104072 and 11271309)
文摘This paper presents a backstepping control method for speed sensorless permanent magnet synchronous motor based on slide model observer. First, a comprehensive dynamical model of the permanent magnet synchronous motor(PMSM) in d-q frame and its space-state equation are established. The slide model control method is used to estimate the electromotive force of PMSM under static frame, while the position of rotor and its actual speed are estimated by using phase loop lock(PLL) method. Next,using Lyapunov stability theorem, the asymptotical stability condition of the slide model observer is presented. Furthermore, based on the backstepping control theory, the PMSM rotor speed and current tracking backstepping controllers are designed, because such controllers display excellent speed tracking and anti-disturbance performance. Finally, Matlab simulation results show that the slide model observer can not only estimate the rotor position and speed of the PMSM accurately, but also ensure the asymptotical stability of the system and effective adjustment of rotor speed and current.
文摘Because brushless direct current(BLDC) motors have the advantages of a compact size, high power density, high efficiency, and long operating life time, they are widely used in many industrial products and electric traction systems. It is known that the BLDC motors have no brushes for commutation. They are commutated with electronically commutation. So, the rotor position information of the BLDC motors must be known to understand which winding will be energized according to the energizing sequence. In most of the existing BLDC motor drivers, rotor position information is detected by Hall effect sensors. This kind of mechanical position sensors will bring additional connections and costs, reliability decrease and noise increase. In order to improve the control performance and extend the range of speed regulation for BLDC motors, a position sensorless control method is proposed in this paper. In the proposed control method, rotor position information of the BLDC motors is detected from the back electromagnetic forces(back-EMFs) which are estimated by an unknown-input observer with line to line currents and line to line voltages. For the purpose of verifying the effectiveness of the proposed control method, a model is built and simulated on the Matlab/Simulink platform. The simulation results show that the speed regulation performance of BLDC motors is improved compared with using Hall effect sensors. At the same time, the reliability of the BLDC motors is improved and the costs of them are reduced because the position sensor is eliminated.
文摘针对传统无刷直流电机(brushless direct current motor, BLDCM)无位置传感器控制在低速起动阶段由于反电动势幅值较小导致换相信号精度下降,进而引发换相失败的问题,本文提出了一种基于河马算法优化BP神经网络的无感控制方法。该方法以电机三相电压与电流信号为输入,构建非线性映射模型,实现对电机精确换相信号的估算。仿真结果表明,本文提出的基于河马优化算法的BP神经网络无位置传感器控制策略在无刷直流电机系统中表现出良好的性能。能够实现准确的换向信号估计,具备快速、平稳的调速特性,系统动态响应良好。
文摘无刷直流电机(Brushless DC Motor,BLDCM)作为一种高效、节能的电机类型,在石油、化工、交通等各领域得到了广泛应用。无位置传感器控制技术作为无刷直流电机控制的重要分支,通过检测电机反电动势或相电流等信息,实现电机的换相控制,无需额外的位置传感器,从而降低了系统成本,提高了系统可靠性。现通过分析无刷直流电机无位置传感器控制技术的研究现状,论证了现有方法的优缺点,并探讨了未来的发展方向。
