The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A robust fault estimation (FE) method is proposed for Lipschitz nonlinear Markov jump system (MJS) based on unknown input observer (UIO). Firstly, the robust UIO is designed under the unknown input and output noise. Then the state estimation error system is established by combining the observer estimated states with real system states. When the error system is stable, the system states and the actuator...
This paper studies an observer based fault diagnosis problem for the induction motor of CRH2 (China Railway High-Speed Train) traction system with stator current sensor faults and disturbances. Considering the nonlinear characteristics of the induction motor, a T-S fuzzy model is constructed to model the motor. To estimate the states and the sensor faults of the motor, simultaneously, the states of...
This paper proposes a novel adaptive sliding mode observer to improve the performance of sensorless control of permanent magnet synchronous motor (PMSM) in the More Electric Aircraft (MEA) system. An adaptive sliding mode observer base on adaptively tuning the observer gain is investigated to relax the requirement for the bound of load uncertainties and strengthen the anti-interference ability. System...
We consider a plant affected by multiple faults (modeled through a piecewise affine formalism). Using a bank of finite-window observers and an artificially-induced feedback delay we provide an exact fault detection and isolation (FDI) mechanism, integrated into the overall fault tolerant control scheme. We use zonotopic characterizations for the sets of interest in order to provide explicit conditions...
This paper presents a robust deadbeat predictive power control (DBPC) for PWM rectifiers with consideration of parameter mismatches. To achieve accurate power control with crude estimations of the grid-side impedance, the system disturbance caused by inaccurate parameter is analyzed. Then, a complex power based sliding-mode disturbance observer (SMDO) is proposed. Both DBPC and SMDO are implemented...
Diminished reality (DR) enables us to see through real objects occluding some areas in our field of view. This interactive display has various applications, such as see-through vision to visualize invisible areas, work area visualization in surgery and landscape simulation. In this paper, we propose two underlying problems in see-through vision, in which hidden areas are observed in real time. First,...
This paper presents a grid-side current controller for grid-tied inverters with LCL filter, including harmonic current elimination. Contrarily to previously proposed harmonic-current controllers, the presented solution offers a generalized method that gives a consistent and stable performance irrespectively of the number of current harmonics to be canceled and of the resonant frequency of the LCL...
This paper deal with the problem of H∞ robust fault estimation for discrete time nonlinear system with a sector bounded nonlinear additive terms and multiple bounded state delay using the Takagi-Sugeno (T-S) fuzzy model. A fuzzy-fault estimation observer (FFEO) design is proposed to achieve fault estimation of T-S state delay models using fuzzy Lyapunov functions (FLF) with actuator and sensor faults...
A sliding mode control method for networked control systems with successive packet losses is studied in this paper. A new estimate strategy is proposed due to the intermittent information obtained at the controller side. Base the the estimation of the system, an integral sliding surface is proposed and a linear control law is constructed to guarantee the system converge to the ideal sliding surface...
To obtain a good dynamic control performance of permanent magnet synchronous motor (PMSM) drives, four sensors (one position, one DC-link voltage and at least two current sensors) are required for the control-loops. This paper deals with the unpredictable faults that occur in any one of the sensors using an advanced fault-tolerant control (FTC) scheme to provide continuous drive operation. The proposed...
Precise force detection is required to realize precise force control, and a lot of research have been conducted for precise and robust force estimation. Based on the industrial trends that the number of load-side encoders is increasing in various industrial fields, a force observer using load-side encoder information has already been proposed to avoid the estimation performance deterioration in the...
This paper presents a new robust estimation of the lateral velocity and yaw rate using switched Takagi-Sugeno fuzzy interval observers. The longitudinal velocity is treated as the online measured time-varying parameter and the cornering stiffness at front and rear tires are assumed to be unknown but bounded with a priori known bounds. Based on a multiple model switching structure, this design divides...
A fault-alarm based hybrid controller design approach for Markovian jump system with actuator fault is investigated in this paper. By using linear matrix inequality (LMI) technology, both robust and reliable controllers are presented, which ensure that the normal systems and the fault systems are robustly stable. Then, in order to reduce the conservativeness of reliable controller design algorithm,...
This article investigates the problem of fault detection for a class of uncertain systems by a new method. Based on the system's own uncertainty and external disturbances, a more effective fault detection method is designed by the method of homogeneous polynomial function. This detection method not only suppresses the effects of disturbances and uncertainties on the residual signal but also makes...
In this paper, the distributed fault detection (FD) problem is addressed for a class of linear stochastic multi-agent systems (MASs). A novel distributed cooperative control scheme is given for reaching bounded formation of the MAS. It is proved that by using relative outputs between neighboring agents, a set of distributed fault detection filters can be designed for each agent to detect the faults...
The paper deals with a full sliding mode approach for induction motor drives direct torque and flux control. The proposed solution is composed by an integral sliding-mode control and by a speed-sensorless sliding mode observer. The suggested Integral Sliding-Mode Direct Torque Control (ISMDTC) is formulated in the stator flux reference frame, without employing current regulators. The adopted sliding...
In this paper, the system decoupling problem has been investigated and a novel decoupling control strategy is presented for Lipschitz nonlinear uncertain multivariable systems. This control strategy consists of an explicit parametric state feedback controller and a linear state observer, where the free parameters of the controller can be adjusted to attenuate the coupling effects. In addition, the...
Model predictive control is a kind of control method based on parameter model. However, in the actual system, the parameters of the motor may deviate from the parameters in the model due to the influence of various objective factors, leading to deterioration of the control performance. In this paper, a strong parameters robustness model predictive current control (MPCC) method for permanent-magnet...
To enhance the control precision of permanent magnet synchronous motor (PMSM) under parameter variations and load torque disturbances, a minimal reduced-order load torque observer (MRLTO) based discrete-time sliding mode control (DSMC) scheme is presented. First, a DSMC controller is presented on the basis of the second-order discrete-time PMSM dynamics model to enhance the speed tracking response...
In view of the magnetic chain recognition accuracy problem of the bearingless induction motor (BIM) under direct torque control (DTC), a speed sensorless based on Super-Twisting-model reference adaptive system (MRAS) is proposed. The speed sensoerless makes rotor flux on the foundation of Super-Twisting second-order sliding mode as a reference model. The speed sensorless is constructed by using MRAS...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.