Mahmoud Hamouda
University of Sousse
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Mahmoud Hamouda.
IEEE Transactions on Industrial Electronics | 2011
Mahmoud Hamouda; Handy Fortin Blanchette; Kamal Al-Haddad; Farhat Fnaiech
This paper proposes a real-time DSP- and FPGA-based implementation method of a space vector modulation (SVM) algorithm for an indirect matrix converter (IMC). Therefore, low-cost and compact control platform is built using a 32-bit fixed-point DSP (TMS320F2812) operating at 150 MHz and a SPARTAN 3E FPGA operating at 50 MHz. The method consists in using the event-manager modules of the DSP to build specified pulses at its PWM output peripherals, which are fed to the digital input ports of a FPGA. Moreover, a simple logical processing and delay times are thereafter implemented in the FPGA so as to synthesize the suitable gate pulse patterns for the semiconductor-controlled devices. It is shown that the proposed implementation method enables high switching frequency operation with high pulse resolution as well as a negligible propagation time for the generation of the gating pulses. Experimental results from an IMC prototype confirm the practical feasibility of the proposed technique.
international symposium on industrial electronics | 2006
Mahmoud Hamouda; Farhat Fnaiech; Kamal Al-Haddad
This paper gives a simple procedure to size the input filter parameters for DBMC. The proposed methodology performs a reasonable THD of the line current as well as a compromise between the input power factor and the THD of the input filter capacitor voltage. On the other side, the input filter performances are evaluated in detail when the converter is controlled by a SVM scheme. Finally, future trends are proposed to overcome the observed drawbacks by using advanced control strategies.
conference of the industrial electronics society | 2005
Mahmoud Hamouda; Farhat Fnaiech; Kamal Al-Haddad
The proposed space-vector modulation scheme for dual-bridge matrix converters uses the principle of the indirect modulation strategy to calculate the duty cycles of the active vectors. On the other hand, zero-vectors duration and distribution within a switching cycle are elaborated such that the line side switches commutate at zero-current leading to safe commutation of the converter. The switching frequency (f s) can be expressed in terms of the line frequency (fl ) as: fs= 6*Ns*fl. For integer values of Ns, synchronization in time between the starting of each switching period and the position of the input current reference in the complex plane is performed. Compared to a previous modulation scheme, this strategy leads to reducing the harmonic distortion factor of the input current in particular case when Ns is odd. The effectiveness of the considered modulation scheme is emphasized using Matlab and Simulink software
IEEE Transactions on Industrial Electronics | 2015
Mahmoud Hamouda; Handy Fortin Blanchette; Kamal Al-Haddad
This paper introduces an enhanced commutation method applied to the indirect matrix converter topology. It is based on the detection of the load current polarity so as to cancel the turn-on delay times of the load-side converters switches. The proposed method allows the grid-side converter devices to commutate at zero current with larger time interval widths provided for this safe commutation. Moreover, it has been shown through experimental results, carried out on a laboratory prototype of the matrix converter, that a substantial improvement of line current total harmonic distortion is achieved.
IEEE Transactions on Power Electronics | 2016
Mahmoud Hamouda; Handy Fortin Blanchette; Kamal Al-Haddad
This paper presents a new control method for indirect matrix converter operating under unbalanced grid voltages. The proposed method aims to achieve balanced output voltages as well as a near unity input power factor operation. First, an opportune reference current accurately generated, and a proportional integral resonant controller are designed in a dq reference frame that is synchronized with the positive sequence of the grid voltages so as to achieve a perfect tracking of input reactive power reference. Then, a real-time estimator of the virtual dc-link voltage is developed with the aim to provide balanced output voltages; therefore, an almost constant active power free of low frequency ripple is supplied from the grid. Experimental results are presented to verify the feasibility and effectiveness of the proposed control method.
international symposium on industrial electronics | 2006
Mahmoud Hamouda; Farhat Fnaiech; Kamal Al-Haddad
A new time-invariant reduced-order model expressed in the d-q rotating reference frame of a three-phase dual-bridge matrix converter is presented. Then, a closed-loop control of the reactive component of the line current is developed. The proposed control-law uses the input-output feedback linearization approach. It allows a unity input power factor operation independently of the voltage transfer ratio variation as well as a reduction of the resonant oscillations at the line side during transient operations. In other words, a considerable reduction of the imperfections provided by the passive input filter is achieved. The performances of the proposed control strategy are tested and compared to those of an open-loop SVM scheme by using matlab and simulink software.
international symposium on industrial electronics | 2007
Mahmoud Hamouda; Farhat Fnaiech; Kamal Al-Haddad
This paper investigates the state-space modeling and real-time simulation of dual-bridge matrix converters (DBMC) based on a DS1104 digital signal processor. This single board controller of dSPACE uses the matlab-simulink software as a front-end for the implementation of graphic models in block- diagram format. First, the state-space model of the converter and the SVM control system are designed with simulink in the form of user-friendly block-diagram. Next, C-codes are generated from the block diagrams with the real-time workshop. After that the executable code is automatically downloaded to the target DSP board. Finally, real-time simulation results are presented and compared to those obtained using off-line computer simulations. Good agreement is observed between both simulation results which shows the effectiveness and accuracy of the proposed realtime simulator.
2007 IEEE Canada Electrical Power Conference | 2007
Mahmoud Hamouda; Kamal Al-Haddad; Farhat Fnaiech; W. Blanchette
In this paper the indirect two-stage matrix converter is used with the aim to convert a high frequency output voltage of a microturbine generator to a low-frequency voltage for utility use. Moreover, in order to allow a unity input power factor operation of the electrical generator, an input-state feedback linearization control-law is implemented to control the current flowing between the generator and the matrix converters input side. Numerical simulations are carried out using matlab and similink software emphasize the two-stage matrix converters capability in providing sinusoidal output voltage with low distortion. Moreover, the unity power factor operation of the generator is also verified over a wide variation of the active power.
conference of the industrial electronics society | 2004
Mahmoud Hamouda; Farhat Fnaiech; Kamal Al-Haddad; Hadi Y. Kanaan
A new state-space modeling of a three-phase AC/AC matrix converter is presented. The main objective of this paper is the design of a sliding mode controller for both controlling the output voltage and input current. The sliding mode strategy is based on the determination of the sliding surfaces and switching laws allowing to choose an appropriate space vector pattern. Robustness regarding line voltage and load parameters variations of this control technique has been recorded by using simulation results on matlab.
international renewable energy congress | 2014
Fatma Ezzahra Lahouar; Jaleleddine Ben Hadj Slama; Mahmoud Hamouda; Fakher Ben Mustapha
The main objective of this paper is to achieve a comparative study between two and three-level converters used in transformerless grid connected two-stage photovoltaic systems. For this purpose, a numerical model of the conversion system has been implemented in Matlab/Simulink software. It consists of a PV array feeding a DC/DC converter as well as a three-phase voltage source converter that ensures the power transfer to the grid through a line inductor. The simulation results showed that the three-level voltage source converter has better performance than the two-level topology in terms of line current harmonic distortion (THD) as well as the line inductors volume.