Hechmi Ben Azza

Real-time implementation of IRFOC for Single-Phase Induction Motor drive using dSpace DS 1104 control board

Abstract Single Phase induction Motors (SPIMs) are one of the widely used motors in the world. This explains the interest accorded by researchers on the improvement of the quality and performances of these motors. The availability of low-cost static converters makes possible the economic use of energy and improvement of the quality of the electromagnetic torque in the SPIM. Nowadays, Indirect Rotor-Field-Oriented Control (IRFOC) techniques brought on a renaissance in modern high-performance control of PWM inverter fed SPIM. In this paper, an IRFOC system is proposed for SPIMs including a relatively simple and effective decoupling scheme. This is achieved by introducing two new decoupling signals to the system. However, model asymmetry in SPIMs causes extra coupling between two stator windings. To use the field orientation control, the asymmetry must be eliminated by using an appropriate variable changing. A computer simulation of the IRFOC for Single-Phase Induction Motor drive is carried out to test the validity of the proposed method at nominal and zero speed. The design, analysis, and implementation for a 1.1-kW Single-Phase Induction Motor are completely carried out using a dSPACE DS1104 digital signal processor (DSP) based real-time data acquisition control (DAC) system, and MATLAB/Simulink environment. Digital simulation and experimental results are presented to show the improvement in performance of the proposed algorithm.

Development and Experimental Evaluation of a Sensorless Speed Control of SPIM Using Adaptive Sliding Mode-MRAS Strategy

The aim of this paper is to provide a high-performance sensorless control of single phase induction motor drives. The synthesis of second-order sliding mode controllers to drive the rotor speed and the stator currents is based on the adaptive super twisting algorithm. The proposed method for the estimation of speed is based on sliding mode model reference adaptive system (SM-MRAS) observer. Whereas, in order to disturbance and uncertainties cancellation, an adaptive time varying switching gain is designed then adopted. A discrete low pass filter was used to improve the estimator generated signal for practical implementation, representing a very simple design process compared with other chattering reduction methods as adding an observer. The stability of the SM-MRAS speed estimation algorithm is proved using the Lyapunov approach and its robustness is investigated under load conditions. Simulation and experimental results prove the effectiveness of the proposed sensorless speed control algorithm.

Implementation of Improved Sliding Mode Observer and Fault Tolerant Control for a PMSM Drive

This paper presents the development and experimentation of Fault-Tolerant Control (FTC) for sensorless Permanent Magnet Synchronous Motor (PMSM) drive with stator resistance tuning. In the fault-tolerant inverter, a redundant leg is added to replace the faulted leg. Consequently, the proposed inverter is a modified topology inverter with fault-tolerant capability, which can be configured as 3-phase 8-switch inverter. The detection of the faulty leg is based only on the output inverter currents measurement. To make toggle to a redundant leg in case of fault occurrence, a Fault Detection and Isolation (FDI) algorithm is proposed in this paper. Experimental results are presented using a 1.4kW, three poles three-phases PMSM. These results show that the proposed FDI algorithm is able to detect and to isolate the open-phase fault in PMSM drive.

Sensor-less direct torque control of permanent magnet synchronous motor drive using Extended Kalman filter

This paper presents the control of the speed problem for a Sensor-less Direct Torque Control (DTC) of permanent magnet synchronous motor (PMSM), using the Extended Kalman Filter algorithm (EKF) by only measuring the phase voltages and motor currents. Also, due to an angle modification scheme with error tracking, the Sensor-less drive system is robust to parameter variations. Simulation result is provided to verify the proposed approach based on the EKF.

Fault-Tolerant Voltage Source Converter for Wind-Driven Doubly Fed Induction Generator Connected to a DC Load

This paper presents a fault-tolerant Voltage Source Converter (VSC) for Field Oriented Control (FOC) of a stand-alone Doubly Fed Induction Generator (DFIG) connected to a DC load. In the proposed topology, the stator of the DFIG is connected to a DC load through a diode rectifier, while the rotor is connected to the DC load through a VSC. This topology allows the integration of DFIG in the hybrid system with other sources of production and storage, such as photovoltaic system, connected to the same DC bus. The fault-tolerant VSC consists in incorporating a fourth leg to replace the faulted leg. A fault detection scheme for switch device open-circuit faults is proposed in this study. The novelty of this method consists in analyzing the rotor currents within normal and faulty operating modes. Simulation results are presented for a 3.7kW DFIG-DC system with single open-circuit faults that validate the methods presented in this study. The effectiveness of the proposed fault detection method has been validated...

Direct voltage control of stand-alone DFIG in wind energy applications

A power generation system has been formulated based on a doubly fed induction generator (DFIG) supplying isolated loads. The stator is connected to the isolated load. Only one bidirectional converter with a battery is employed on the rotor side. The direct voltage control (DVC) is applied to control the DFIG system. To regulate the voltage and frequency load, the error of the measured rotor current and reference value feed the hysteresis regulator, the output of which are the control pulses. The reference rotor currents are obtained by the DVC technique. Simulation results for a 3.7 kW prototype DFIG are presented in this paper.

A MRAS observer for sensorless control of wind-driven doubly fed induction generator in remote areas

This study presents a sensorless control of wind-driven doubly fed induction generators (DFIG) connected to an isolated load. The direct voltage control is adopted to command the rotor side converter. A Model Reference Adaptive System (MRAS) based technique is used in this topology for the sensorless generator speed estimation. The proposed sensorless control system is robust against speed and load variations. To verify the performances of the proposed sensorless control technique under speed and load variations, Simulation studies are performed with 2 MW DFIG systems.

Direct torque control of three-phase PMSM with one switch of inverter open fault

In this paper, direct torque control (DTC) of a three phase permanent magnet synchronous motor (PMSM) one switch open-circuit fault is described. An extra inverter leg is employed to provide the current path during the fault operation.

A Time-Varying Gain Super-Twisting Algorithm to Drive a SPIM

To acquire a performed and practical solution that is free from chattering, this study proposes the use of an adaptive super-twisting algorithm to drive a single-phase induction motor. Partial feedback linearization is applied before using a super-twisting algorithm to control the speed and stator currents. The load torque is considered an unknown but bounded disturbance. Therefore, a time-varying switching gain that does not require prior knowledge of the disturbance boundary is proposed. A simple sliding surface is formulated as the difference between the real and desired trajectories obtained from the indirect rotor flux oriented control strategy. To illustrate the effectiveness of the proposed control structure, an experimental setup around a digital signal processor (dS1104) is developed and several tests are performed.