Mohand Oulhadj Mahmoudi

VECTOR CONTROL WITH OPTIMAL TORQUE OF A SALIENT-POLE DOUBLE STAR SYNCHRONOUS MACHINE SUPPLIED BY THREE-LEVEL INVERTERS

Vector Control with Optimal Torque of a Salient-Pole Double Star Synchronous Machine Supplied by Three-Level Inverters This work relates to the study of the vector control of the salient-pole double star synchronous machine drive (DSSM) fed by three-level inverters which are controlled by PWM hysteresis strategy. Indeed, it is a question of carrying out a decoupling between rotor flux and electromagnetic torque, by introducing a vector control with an optimal torque working and by imposing constant flux regime. Furthermore, to ensure a decoupled dynamic behavior of the machine as in the case of a DC machine, a regulation of the rotor current has been introduced through a chopper operating at 5 kHz chopping frequency, feeding the excitation circuit. The obtained results are very satisfactory and reveal the effectiveness of the proposed approach.

ROBUST DTC BASED ON ADAPTIVE FUZZY CONTROL OF DOUBLE STAR SYNCHRONOUS MACHINE DRIVE WITH FIXED SWITCHING FREQUENCY

Robust DTC Based on Adaptive Fuzzy Control of Double Star Synchronous Machine Drive with Fixed Switching Frequency The double star synchronous machine (DSSM) is widely used for high power traction drives. It possesses several advantages over the conventional three phase machine. To reduce the torque ripple the DSSM are supplied with source voltage inverter (VSI). The model of the system DSSM-VSI is high order, multivariable and nonlinear. Further, big harmonic currents are generated. The aim of this paper is to develop a new direct torque adaptive fuzzy logic control in order to control DSSM and minimize the harmonics currents. Simulations results are given to show the effectiveness of our approach.

DTC-SVM control of induction machine fed by three level NPC matrix converter

This work proposes a DTC-SVM control algorithm based on Stator coordinate transformation to control an induction machine fed by a three level Neutral point clamped matrix converter. The algorithm is simulated on Matlab Simulink to verify its performance. It gives good performance in general. The results are discussed and a study of the effect of the variation of stator resistance is proposed also.

Novel welding machine based on small PMSG wind turbine

This paper investigates a small wind turbine based on a permanent magnet synchronous generator (PMSG) to replace the used diesel generator in welding machines at remote sites. The proposed welding machine is designed using a variable-speed PMSG wind turbine to achieve an optimal performance. The problem of fluctuation in wind energy is solved by adding a storage battery and a maximum power point tracking (MPPT) stage. A controllable direct current power supply based on the full-bridge inverter topology is adopted for the welding side. The control strategies of MPPT, pitch angle blade, and arc welding current are also discussed. Matlab/Simulink is utilized to simulate the proposed system. Simulation results show that the proposed welding machine can provide a stable and robust welding current under varying wind and arc load conditions. Simulation results demonstrate the feasibility and efficiency of the proposed welding machine.This paper investigates a small wind turbine based on a permanent magnet synchronous generator (PMSG) to replace the used diesel generator in welding machines at remote sites. The proposed welding machine is designed using a variable-speed PMSG wind turbine to achieve an optimal performance. The problem of fluctuation in wind energy is solved by adding a storage battery and a maximum power point tracking (MPPT) stage. A controllable direct current power supply based on the full-bridge inverter topology is adopted for the welding side. The control strategies of MPPT, pitch angle blade, and arc welding current are also discussed. Matlab/Simulink is utilized to simulate the proposed system. Simulation results show that the proposed welding machine can provide a stable and robust welding current under varying wind and arc load conditions. Simulation results demonstrate the feasibility and efficiency of the proposed welding machine.

Study and comparison between two DTC strategies of induction machine fed by direct matrix converter

This work aims to study, analyze, and compare two direct torque control (DTC) methods of induction machine fed by [3 × 3] direct matrix converter (MC). The first method, DTC, uses the direct model of the matrix converter, whereas the second method, direct torque control indirect (DTCI), uses its indirect model, which describes MC as a combination of a four-quadrant rectifier with a two-level inverter. The two methods are simulated with the same parameters and references of speed and flux. An experimental validation is performed on a prototype of a [3 × 3] direct matrix converter realized in the laboratory, which feeds a three-phase induction machine coupled with a brake. These tests allowed us to demonstrate the practical feasibility of these control schemes. The algorithms are implemented on a dSPACE 1104 controller board. The input power factor is fixed to 1. A comparison between the two algorithms results based on several criteria (power quality, static and dynamic performance of the system, and mainte...

High Performances of Five–Phase Induction Machine Feeding by A [3 × 5] Matrix Converter

Abstract In this paper, we study an analytic technique to control matrix converter for a four-quadrant five-phase induction machine drive with use PWM five intervals modulation strategy. The multiphase induction machine is feeding by a matrix converter using a three-phase network. Special emphasis is given to the sinusoidal five phase voltage in the output and five phase voltage input current modulation. Simulation results are presented.