Robust Control Of Induction Motor Research Articles

A Robust Regenerative-Braking Control of Induction Motors for EVs Applications

EVs suffer from short driving range because of limited capacity of the battery. An advantage of EVs over internal-combustion vehicles is the ability of regenerative braking (RB). By this advantage, EVs can develop energy by RB which can be stored in the battery for later use to increase the driving range of EVs. There are different motors that can be used in EVs, and the control during RB mode is dedicated for certain motor types. However, the previous studies for EV-based IM drives consider the motor-speed control without considering its RB. This paper proposes a robust control of induction motor (IM) during RB mode of EVs. The proposed control system is simple and depends only on mathematical calculations. The obtained results confirm the effectiveness and accuracy of the suggested control strategy with a good dynamic behavior under different operating conditions. Also, the results assure the robustness of control capabilities under parameters uncertainties during the RB mode of EV-based IM drives.

Fuzzy-Logic Method And Sliding-Mode Control For Induction Motor 424 Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP) © Copyright: All rights reserved. Retrieval Number: F11190886S219/2019©BEIESP DOI:10.35940/ijeat.F1119.0886S219 Journal Website: www.ijeat.org Figure 1. Block diagram of conventional DTC (CDTC) Figure2. Control principle of conventional DTC B. DTC Using Switching Table The fundamental idea behind the DTC concept is to achieve

Direct torque control (DTC) is known to generate fast and robust control for induction motor drives. Even though, in classical DTC, there exists a notable ripple in torque and flux during steady state, which can be reflected towards the speed response and generating undesirable acoustic noise. This paper introduces two approaches based on variable structure control (VSC) and fuzzy logic control (FLC) to mitigate steady state chattering problem while preserving the merits of DTC operation. The inverter is controlled directly on the basis of stator flux and the torque errors, by selecting most appropriate voltage vector from switching logic table. A comparative study is performed for the three control topologies including conventional DTC and simulation results are presented and discussed. It is concluded that SMC and intelligent control based technique provide better characteristics in steady state operation with regards to the conventional DTC.

Robust Control of Induction Motor with H∞Theory based on Loopshaping

The <TEX>$H_{\infty}$</TEX> approach, adopted in this paper, is based on loop shaping using a normalized coprime factor combined with a field-oriented control to control induction motor. We develop two loops. The first one, the inner loop, controls the stator current by <TEX>$H{\infty}$</TEX> controller in order to obtain good performance. The second loop, the outer one, guarantees stability and tracking performance of speed and rotor flux using a proportional integral controller. When the rotor flux cannot be measured, we introduce a flux observer to estimate the rotor flux. Simulation and experimental results are presented to validate the effectiveness and the good performance of this control technique.

Vector control for induction motor drives based on adaptive variable structure control algorithm

This paper presents a new adaptive robust control for induction motor drives. The proposed control scheme is based on the so-called field oriented control theory that allows to control the induction motor like a separately excited direct current motor drive, where the field flux (produced by the field current) and the armature flux (produced by the armature current) are decoupled. The robust control law is based on the sliding mode control theory, but unlike the traditional sliding mode control schemes, the proposed design incorporates an adaptive switching gain that avoids the need of calculating an upper limit of the system uncertainties. Moreover the proposed control law is smoothed out in order to avoid the high control activity inherent to the switching control laws. The resulting closed loop system is proven to be stable using the Lyapunov stability theory. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society

An Adaptive Variable Structure Control Law for Sensorless Induction Motors

This paper presents a new sensorless adaptive robust control for induction motor drives. The proposed design employs the so called vector (or field oriented) control theory for the induction motor drives and the designed control law is based on an integral sliding-mode algorithm that overcomes the system uncertainties. The proposed sliding-mode control law incorporates an adaptive switching gain that avoid calculating an upper limit of the system uncertainties. The design includes rotor speed estimation from measured stator terminal voltages and currents. The estimated speed is used as feedback in an indirect vector control system in order to achieve the speed control without the use of shaft mounted transducers. The stability analysis of the proposed controller under parameter uncertainties and load disturbances is provided using the Lyapunov stability theory. Finally simulated results show on the one hand that the proposed controller with the proposed observer provides high-performance dynamic characteristics, and on the other hand that this scheme is robust with respect to plant parameter variations and external load disturbances.

Robust control of induction motor drive with rotor time-constant adaptation

In this paper, an indirect field-oriented induction motor drive with a rotor time-constant adaptation is presented. Since the deviated rotor time-constant of an induction motor makes the indirect field-orientation inaccurate, an adaptation mechanism is proposed to tune the rotor time-constant to establish a complete indirect field-oriented control for an induction motor drive. With the rotor time-constant adaptation, the indirect field-oriented control has the robustness property for decoupling torque and flux components. In order to further insure the robustness of the servo control, a novel variable-structure speed controller is proposed under the adaptive field-orientation operation. A novel sliding surface with an integral component for the variable structure speed controller is designed, and exponential convergence in speed-tracking control is obtained. Using the proposed variable-structure speed controller, the insensitivity for parameter uncertainty and disturbance load is provided. Finally, a simulation and experimental results are demonstrated.

A Robust Control of Induction Motor Drives by Nonlinear State Feedback-Experimental Verification

We have already proposed a nonlinear feedback control of induction motor drives, where the induction motor is modeled as a bilinear system. This control method guarantees the robust stability in the large. Whereas it is not guaranteed by the so-called vector control method.This paper gives some experimental results obtained by applying the proposed method to a practical induction motor which is fed by a three-phase twelve-pulse bridge cycloconverter. The proposed method is implemented by a digital signal processor which is a special microprocessor designed for the high speed signal processing. The performance of the proposed method is verified by these experimental results. These results also show that the proposed method is superior, at least for robust stability against the secondary resistance variation from the nominal value, to the vector control method. At the last section, this paper also gives some remarks on applications of this control method to practical systems.

A Robust Control of Induction Motor Drives by Nonlinear State Feedback

The so-called vector control method is currently used for induction motor drives.This method aims at high speed control of induction motor drives to take place of the d. c. motor in high speed industrial applications. It has not been established, however, whether this method can stabilize the induction motor system in the large, nor is there any discussion about its robustness to the present. This paper proposes a nonlinear feedback control of induction motor drives, where the induction motor is regarded as a bilinear system. The stability of the induction motor system in the large is guaranteed, and this stability is robust against substantial motor constant variation from the nominal value. Simulation results also show that the control method proposed in this paper is superior to the vector control method.