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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...
A torque and flux FCS-MPC (Finite Control Set Model Predictive Control) of an induction motor with unity power factor fed by an indirect matrix converter has been investigated and presented in this paper. The proposed control scheme utilizes the discrete nature of power converter and predicts the future behavior of the system variables. Also the method selects the switching state that minimizes a...
This paper proposes a predictive torque and flux control for a multi-motor drive system. The scheme is based on a six-leg indirect matrix converter used to drive two induction machines operating at the same speed even under different load torque conditions. By using the mathematical model of the converter (input filter and switches) and machines, the proposed control scheme selects the switching state...
Wind Turbine (WT) systems based on Permanent Magnet Synchronous Generators (PMSG) have become important mainly due to their high power factor and high efficiency. In order to reduce costs, maintenance and complexity, speed and position estimators can be used to replace the corresponding sensors in low and high power WT. This paper studies a PMSG flux observer, which is used along with a PLL to estimate...
A simple and intuitive Doubly Fed Induction Generator (DFIG) predictive rotor current control scheme is presented. Predictive control of an Indirect Matrix Converter (IMC) is combined with predictive rotor current control of a DFIG to achieve a very good dynamic response as the rotor currents smoothly follow the applied reference in a ±30% range of the generator nominal rpm. Simulation results are...
A predictive torque and flux control method for an induction machine fed by an indirect matrix converter is presented in this paper. The control scheme selects the switching state that minimizes the error in the torque and flux predictions according to their reference values and, at the same time, the control scheme is enhanced by including a reactive power minimization strategy with the goal to have...
A predictive torque and flux control method for an induction machine fed by an indirect matrix converter is presented in this paper. Simple discrete models of the induction machine and the converter are used to predict the behavior of torque and flux. The control scheme selects the switching state that minimizes the error in the torque and flux predictions according to their reference values. The...
In this paper two of the most extensively used high performance control strategies for electrical drives as Field Oriented Control (FOC) and Direct Torque Control (DTC) are compared to a new Predictive Torque Control method (PTC). Same commutation and sampling frequency are taken into account in order to compare these techniques. Preliminary results verify the excellent performance of the predictive...
In this paper, we present a predictive control algorithm that uses a state-space model. Based on classical control theory, an exact discrete-time model of an induction machine with time-varying components is developed improving the accuracy of state prediction. A torque and stator flux magnitude control algorithm evaluates a cost function for each switching state available in a two-level inverter...
This paper describes an analysis method for achieving control torque and speed with vector control for induction motors. An indirect field-oriented output feedback motor controller is presented; it is suitable for low-cost applications. A current model control is used to sense back electromotive force (back-EMF) by means of an analog to digital converter (ADC); its simulation and filtering are discussed...
A new modulation and control strategy for a matrix converter induction motor drive is presented in this paper. A discrete model of the converter, motor and input filter is used to predict the behaviour of torque, flux and input power of the system. The switching state that optimizes the value of a quality function is selected. The predictive control method, referred to as predictive torque control...
This paper analyzes the fault-tolerant operation of a Series Connected H-Bridge inverter topology (SCHB) supplying an induction machine. The standard approach considers a bypass of the faulty cells by means of a contactor and it carries out a reconfiguration of the modulator in order to generate balanced phase output voltages. The price that must be paid for this emergency operating mode is a reduction...
The common characteristic of all direct torque control drives is the manipulation of stator flux by means of the application of an adequate stator voltage. In this work this concept is extended to the pulse width modulated of the correct stator voltage to achieve stator flux regulation and tracking of commanded torque. The strategy is based on a few simplified machine equations based on the principle...
This work proposes a general scheme to detect induction motor faults by monitoring the motor current. The scheme is based on signal processing (predictive filters), soft computing techniques (fuzzy logic), the analytical studies of induction motor under fault conditions and the analysis of data generated by finite element method (FEM). The predictive filter is used in order to separate the fundamental...
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