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The simulation of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Various simulations, varying the torque and current tolerances, are carried out in the low torque and high torque range. Simulation results show a direct influence...
The application of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) in the dynamic state is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Positive and negative torque setpoint steps are simulated in the low torque and high torque range. Simulation results show that the number...
A predictive control strategy applied to a matrix converter based induction machine drive is presented in this paper. The strategy features the advantages of the direct torque control (DTC) and the predictive control, verifying its robustness throughout its behavior analysis under an unbalanced AC supply. The predictive control approach is based on the model of the converter-machine system. Such model...
In this paper, a direct torque hysteresis controller (DTHC) driving a permanent magnet synchronous machine is discussed. A two-level, three-phase conventional inverter is used as means of power conversion. Advantages such as a low switching frequency as well as further opportunities of the DTHC are specified. The simulation results show a high degree of potential for the DTHC in future applications.
This paper presents a direct torque control with space vector modulation method for matrix converter drives. It is possible to combine the advantages of matrix converter with the advantages of the DTC strategy by using space vector modulation algorithm of matrix converter and direct torque control strategy of induction motor. The proposed control system has been validated through simulations with...
This paper proposes a fuzzy sliding-mode speed controller for high performance IM drive application. The sliding-mode speed controller of asynchronous induction motors is discussed firstly. Then, the fuzzy control is used for optimizing the switching on the sliding surface. Finally, the robust performance of the speed controller is validated with simulations and experiments.
Model predictive control with a finite control set has emerged as a promising control tool for power converters and drives. One of the major advantages is the possibility to control several system variables with a single control law, by including them with appropriate weighting factors. However, at the present state of the art, these coefficients are determined empirically. There is no analytical...
The strongly nonlinear magnetic characteristic of switched reluctance motors (SRMs) makes their torque control a challenging task. In contrast to standard current-based control schemes, we use model predictive control (MPC) and directly manipulate the switches of the dc-link power converter. At each sampling time a constrained finite-time optimal control problem based on a discrete-time nonlinear...
A four-phase 8/6 pole and 75 kW switched reluctance motor drive based on 32-bit digital signal processor TMS320F2812 is designed. The details of the controller design and analysis are discussed. In addition, aiming at solving the nonlinear problems of the switched reluctance motor, fuzzy-PI hybrid algorithm is presented to control the motor speed and the phase current. Experimental results show that...
This paper presents a new switching technique for direct torque control of induction motor using four-switch three phase inverter (DTC-FSTPI-IM) for low power applications with DC - link voltage imbalance. The new control algorithm and modified switching table are based using a real-time compensation SVPWM technique when generating switching control signal in consideration of unbalanced DC-link voltages...
Radial force and torque are the control objectives that determine the machine performance of levitation and rotation in a bearingless switched reluctance motor (BSRM). This paper proposes a control scheme for rotating and levitating a 12/8 BSRM. The motor average torque and radial force are independently controlled with hybrid excitations in main windings and levitation windings. First, the mathematical...
This paper represents an alternative approach on designing PSS for a single machine and infinite bus (SMIB) system based on sliding mode control (SMC) technique. SMIB system is chosen as it is such a simple configuration which is extremely useful in understanding basic effects and concepts of PSS. In order to test the effectiveness of the proposed scheme, simulation will be carried out to analyze...
This paper presents an intelligent control method for the Acrobot with applications of neural network (NN) and genetic algorithm (GA). A switch controller is proposed where a neurocontroller (NC) optimized by GA is used for the swing-up stage and a linear quadratic regulator (LQR) is applied to the balancing stage. In order to analyze the characteristics of the proposed control system, we investigate...
A new, the torque and speed sensorless induction motor control is proposed, analyzed and experimentally verified in this paper. The control is based on stator and rotor flux as state variables. This choice of state variables allows a graphical representation which is transparent and insightful. A speed sensorless implementation of the control is demonstrated experimentally for low speed operation...
It is a frequent wish for mechatronic systems to be able to adapt themselves to changing environmental conditions at runtime. Self-adapting behavior may require complex reconfigurations of controllers in the shape of mode management and control algorithms. These changes ought to be executed at runtime without shutting the system down. As this procedure may bring about unexpected system behavior we...
To solve the problems of torque ripple and in constant switch frequency of inverter in the conventional direct torque control (DTC), a novel DTC method using space vector pulse width modulation (SVM) is proposed based on analysis of permanent magnet synchronous motor (PMSM) mathematical model, where hysteresis controller is substituted by PI controller and switch table is substituted by SVM. In order...
In this paper the theory of direct torque control (DTC) in permanent magnet synchronous motor (PMSM) is investigated. The effect of zero voltage vectors on the performances of the PMSM DTC drives is analyzed. Different from the conventional switching table eliminating zero voltage vectors, a novel switching table using zero voltage vectors is proposed. Simulation results show that the PMSM DTC drives...
Using of the wind energy has become increasingly important as a renewable energy source and therefore is an increasing interest in exploiting it using a switched reluctance machine as a generator and optimize its characteristics in this domain. This work analyzes the generator mode of the switched reluctance machine in the direct coupling to the turbine shaft and coupled to the shaft through a gearbox.
Vector control based on rotor field orientation control (FOC) and direct torque control based on stator field observation (DTC) are nowadays two mainstream control strategies in modern asynchronous motor speed regulating system. Based on the smooth switching control that is combined with the two control methods in the light of the complementarity each other, the online adaptive parameters estimation...
The problem of optimal current commutation control, which bases on optimal off-line selection of switching angles, was investigated in the paper. Two different criteria of optimal control were taken into account: the maximum electromagnetic torque for given current and the minimum electromagnetic torque ripples. Optimization process was provided on base of computer model of SRM drive. Obtained simulation...
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