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RT-LAB platform for real-time implementation of luenberger observer based speed sensorless control of induction motor

Bechar Mansour, Hazzab Abdeldjebar, Habbab Mohamed, Sicard Pierre, Slimi Mohammed

Journal of Automation Mobile Robotics and Intelligent Systems

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2019

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Vol. 13, No. 4

65--72

EN

This paper proposes RT-LAB platform for realtime implementation of Luenberger observer based on speed sensorless scalar control of induction motor. The observed shaft speed is derived from lyapunov’s theory. It is shown by an extensive study that this Luenberger observer with PI anti-windup speed controller is completely satisfactory at (nominal, variable, reverse) speed references and it is also robust to load torque disturbance. The sensorless control algorithm along with the proposed Luenberger observer is modeled, built in the Host PC and successfully implemented in real-time using digital simulator OP5600. The experimental results observed in the GW-Instek digital oscilloscope’s screen validate the effectiveness of the proposed Luenberger observer for speed sensorless scheme.

2

Dynamic performance of estimator-based speed sensorless control of induction machines using extended and unscented Kalman filters

Horváth K., Kuslits M.

Power Electronics and Drives

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2018

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Vol. 3 (38), No. 1

129--144

EN

This paper presents an estimator-based speed sensorless field-oriented control (FOC) method for induction machines, where the state estimator is based on a self-contained, non-linear model. This model characterises both the electrical and the mechanical behaviours of the machine and describes them with seven state variables. The state variables are estimated from the measured stator currents and from the known stator voltages by using an estimator algorithm. An important aspect is that one of the state variables is the load torque and, hence, it is also estimated by the estimator. Using this feature, the applied estimator-based speed sensorless control algorithm may be operated adequately besides varying load torque. In this work, two different variants of the control algorithm are developed based on the extended and the unscented Kalman filters (EKF, UKF) as state estimators. The dynamic performance of these variants is tested and compared using experiments and simulations. Results show that the variants have comparable performance in general, but the UKF-based control provides better performance if a stochastically varying load disturbance is present.

3

Speed Sensorless Control of Induction Motor Based on a Non-Linear Flux and Speed Observer with Parameters Estimation and Considering Iron Loss

Alemi-Rostami M., Abrishamifar A.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 3a

89--97

EN

In this paper, a control method is presented for induction motor which offers high efficiency and high dynamics even considering the influences of iron loss. Recently, research to consider the influences of iron loss has been made in the vector control of an induction motor. Vector control method is a quite complex task which demands precise information about the rotor speed and the position of the magnetic flux. The vector control method presented in this paper, estimates both rotor speed and amplitude magnetic flux rotor. However, there are also applications in which even speed sensors should be omitted. In this method, three-phase motor currents and DC link voltage are measured by means of a nonlinear observer and considering the Lyapunov function for current error, motor parameters, rotor shaft and position of flux are estimated. To stabilize the control system, the Lyapunov function for error, is used. Then, using the genetic algorithm, the value of controlling coefficients their and general effects on system's behavior are obtained. The simulation and experimental results confirm the resistant performance and the proper dynamic efficiency of this method.

PL

W artykule przedstawiono algorytm sterowania maszyną indukcyjną, uwzględniający straty w żelazie. Sterowanie opiera się na bezczujnikowym pomiarze prędkości obrotowej, przy pomocy obserwatora. Korzystając z pomiarów prądów fazowych i napięcia DC-link, z funkcji Lyapunov’a wyznaczana jest prędkość i strumień wirnika. Implementacja algorytmu genetycznego pozwoliła na ocenę wpływu współczynników regulacji na odpowiedź układu. Przedstawiono wyniki symulacyjne i eksperymentalne.

4

Simple speed sensorless DTC-SVM scheme for induction motor drives

Abu-Rub H., Stando D., Kazmierkowski M. P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2013

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Vol. 61, nr 2

301--307

EN

The paper focuses on the development of a novel DSP based high performance speed sensorless control scheme for PWM voltage source inverter fed induction motor drives. Firstly, two generic torque and flux control methods the Field Oriented Control (FOC) and Direct Torque Control (DTC), are briefly described. For implementation the sensorless scheme DTC with Space Vector Modulation (DTCSVM) has been selected because it eliminates the disadvantages associated with the DTC while keeping the advantages of both FOC and DTC. Secondly, the simple flux vector observer allowing speed sensor elimination is given. The novelty of the presented system lays in combining the DTC-SVM structure with a simple observer for both torque/flux and speed sensorless control. Furthermore, the DTC-SVM structure which operates in speed sensorless and torque control mode is presented. Finally, the description of a 50 kW laboratory drive and experimental results illustrating properties of the system are given.

5

Bezczujnikowe sterowanie falownikowego napędu indukcyjnego dla pojazdów elektrycznych w szerokim zakresie prędkości

Stando M., Kaźmierkowski M. P., Orłowska-Kowalska T., Dybkowski M.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 3

307-312

PL

W artykule dokonano analizy porównawczej trzech wybranych algorytmów estymacji wektora strumienia stojana silnika klatkowego dla bezczujnikowego sterowania napędem pojazdów elektrycznych w transporcie publicznym. Estymatory te pracują bez sygnału prędkości kątowej wału silnika. Przeprowadzono badania wrażliwości estymacji na zmiany parametrów silnika oraz określono minimalną częstotliwość pracy napędu przy zastosowaniu wszystkich trzech badanych estymatorów. Podano wybrane wyniki badań symulacyjnych oraz eksperymentalnych napędu oozczujnikowego z silnikiem klatkowym o mocy 7,5 kW.

EN

In this paper three selected stator flux vector estimation algorithms for rotor-cage induction motors are investigated and compared. These estimators operate without motor speed feedback. The accuracy of estimation and sensitivity to motor parameter changes as well as lowest operation speed for all considered algorithms are tested. Same selected simulated and experimental oscillograms measured of 7,5 kW drives are presented.

6

Sensorless speed control including zero speed of non salient PM synchronous drives

Rasmussen H.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2006

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Vol. 54, nr 3

293-298

EN

This paper presents a position sensorless drive of non salient pole PM synchronous motors for all speeds including zero speed. Using adaptive Lyapunov design a new approach for the design of an observer is developed. The resulting scheme leads to a nonlinear full order observer for the motor states including the rotor speed. Assuming motor parameters known the design achieves stability with guaranteed region of attraction even at zero speed. The control method is made robust at zero and low speed by changing the direct vector current component to a value different from zero. In order to verify the applicability of the method the controller has been implemented and tested on a 800 W motor.