Mahmoud Hamouda

Mahmoud Hamouda
University of Sousse | ISTLS · Department of Electronic Engineering

Professor

About

118
Publications
28,775
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1,109
Citations

Publications

Publications (118)
Article
Full-text available
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 u...
Article
Full-text available
The main objective of this paper is to implement a nonlinear control for a PWM voltage source converter with a reduced number of sensors. For this purpose an input-output feedback linearization control strategy is firstly implemented in order to control both the line current and the DC output voltage. Next, an estimator of the AC mains voltage is i...
Article
Full-text available
The currentpsilas path through the power semiconductors of matrix converters depends inherently on the load side displacement factor. In principle, two particular cases should be investigated. They correspond to a lagging/leading output displacement angle lower and superior to pi/6 respectively. This paper determines new analytical expressions of t...
Conference Paper
Full-text available
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 t...
Conference Paper
Full-text available
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 c...
Conference Paper
Full-text available
In this article, a neural network based on theSuper-Twisting sliding mode control (STSMC) is proposedfor controlling the voltage of a DC-DC converter in anembedded propulsion system under constant power load(CPL). The converter model is then linearized in theneighborhood of the equilibrium point method, andoptimal parameters for the PI compensator...
Article
Full-text available
This paper focuses on enhancing the resilience of Power Park Modules (PPMs) connected to the grid via power electronic units under asymmetrical voltage sag conditions. We particularly address three interconnected constraints crucial for Low-Voltage Ride-Through (LVRT) capability of PPMs: grid voltage support, overcurrent protection and the DC-link...
Article
Full-text available
This paper proposes a delayed signal-based demodulation algorithm that enables a fast and accurate extraction of the positive/negative sequences and DC-offset in the grid voltage under a frequency drift. Moreover, a simplified mathematical formalism is proposed to reduce the computational burden for real-time implementation. The algorithm is incorp...
Poster
Full-text available
First International Conference on Artificial Intelligence and Green Energy
Article
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Transformerless grid-connected inverters for photovoltaic (PV) applications provide several advantages such as reduced cost and volume as well as an increased efficiency. However, the removal of the transformer gives rise to several problems related to leakage currents and electromagnetic interferences (EMI). This paper presents different chaotic u...
Article
Full-text available
The topology of grid-connected seven-switch boost-type current source inverter (CSI7) is a promising alternative to the conventional six-switch current source inverter (CSI) due its superiority in terms of reliability and energy efficiency. It is a simple single-stage boost-type converter that allows the injection of high quality sinusoidal AC-curr...
Article
Full-text available
State of Charge (SoC) of Lithium-ion battery is a key parameter in battery management systems for electric vehicles. This paper uses the fundamental theory of the smooth variable structure filter (SVSF) and proposes a SoC estimation algorithm for a Manganese Cobalt (NMC) cell with a nominal capacity of 20 Ah. Several tests are conducted considering...
Research Proposal
Full-text available
It is a pleasure to invite you to submit yours scientific contribution to IEEE ICAIGE 2023 technical co-sponsored by IEEE and IES and organized by the Tunisian Association of Renewable Energy (ATER) and the University of Sousse. The conference aims to gather researchers, academics, scientists and professionals worldwide to present and discuss the...
Article
Full-text available
The packed U-cell inverter is a new and promising multilevel topology that uses a reduced number of power semi-conductors as compared to similar multilevel topologies. Even though many control and modulation algorithms were developed in the research literature, the fault detection and isolation of this converter have not yet been addressed. This pa...
Conference Paper
Full-text available
Abstract— This paper proposes an artificial neural network (ANN) based auto-tuned PI compensator to enhance the dynamic response of the DC-link voltage in a grid-connected voltage source converter (GVSC). The converter’s model is linearized using the Jacobian method and the optimized parameters of the PI compensator for many local operation regions...
Article
Full-text available
The precision of equivalent circuit model (ECM)-based state of charge (SoC) estimation methods is vulnerable to the variation of the battery parameters, due to several internal and external factors. In this regard, this study proposes a fuzzy logic method for the approximate estimation of the ECM parameters at different temperatures and SoC levels....
Article
Full-text available
The precision of equivalent circuit model (ECM)-based state of charge (SoC) estimation methods is vulnerable to the variation of the battery parameters, due to several internal and external factors. In this regard, this study proposes a fuzzy logic method for the approximate estimation of the ECM parameters at different temperatures and SoC levels....
Article
Full-text available
The computational efficiency is a challenging task in the real‐time implementation of battery State of Charge (SoC) estimation algorithms in Electric Vehicle (EV) application. This study proposes for the first time a pure hardware architecture of a Smooth Variable Structure Filter (SVSF) to estimate the SoC of a lithium‐ion battery in an EV. The pr...
Poster
Full-text available
Nowadays, renewable energy sources (RES) represent a real alternative to unsustainable and polluting fossil sources. Indeed, RES are expected to, strongly, contribute in the reduction of greenhouse emissions through the production of sustainable and green energy. The world is now generating more than 20% of its electricity from PV, wind, fuel cells...
Book
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Ce livre propose une solution d'implémentation matérielle d’une technique de commande MLI multi-porteuses d'un convertisseur NPC à trois niveaux de tension. Ainsi, nous avons proposé une méthode de conception structurée divisant le projet en plusieurs entités incluant un module de génération des signaux modulants, un module de génération des porteu...
Article
Full-text available
The State of Charge monitoring is a key operation for the safety and reliability of electric vehicles. The Extended Kalman Filter (EKF) is a powerful algorithm that enables an accurate estimation of the SoC under noisy measurement conditions. However, its real‐time implementation needs a higher computation burden and lots of resources. To achieve a...
Chapter
The performance of photovoltaic systems is affected during partial shading condition, where the power-voltage curve exhibits several peaks. Hence, a maximum power point (MPP) controller is required to harvest the maximum available power. Swarm intelligence-based metaheuristic algorithms present a promising approach to handle photovoltaic maximum po...
Article
This paper proposes a noninvasive open-switch fault detection method based on the analysis of the high frequency signals. The faulty power switch is detected by metering the emitted near-field above a new topology using the wavelet packet transform and considereing a complex control algorithm. The proposed method is tested on a single-phase five-le...
Chapter
Voltage sags are considered among the most severe grid faults giving rise to overcurrent problems and uncontrolled power oscillations. Distributed power generation systems which are commonly connected to the grid through a voltage source inverter (VSI) must help support the grid voltages during the faults and postfault operation. Therefore, an appr...
Article
Full-text available
Recently, boost-type current source inverters (CSIs) have received a considerable attention in grid connected photovoltaic (PV) applications thanks to their salient features such as high reliability and the aptitude to operate with a DC-link voltage lower than the grid side voltage. This paper investigates the performance of three different switchi...
Poster
Full-text available
This special session addresses the recent advances and control techniques of static power converters topologies dedicated to photovoltaic (PV) energy conversion. This includes DC-DC topologies, single-phase and three-phase inverters, transformerless grid-connected power systems, multilevel inverters, topologies with reduced leakage current, grid fo...
Poster
Full-text available
This special session addresses the recent advances and control techniques of static power converters topologies dedicated to photovoltaic (PV) energy conversion. This includes DC-DC topologies, single-phase and three-phase inverters, transformerless grid-connected power systems, multilevel inverters, topologies with reduced leakage current, grid fo...
Article
Full-text available
The quasi-type-l phase-locked loop (QT1-PLL) is a grid synchronization technique that has become very popular in recent years thanks to its attractive performance such as easy implementation, fast dynamic response, and good accuracy in steady-state operation. However, it is still vulnerable to operation under harmonically distorted grid voltages wi...
Article
Full-text available
In this study, a comparative study between two single‐phase transformerless grid‐connected photovoltaic (PV) inverters, namely H5 and optimised H5 (oH5), is carried out based on conducted electromagnetic interference (EMI) performance. For this purpose, a high‐frequency (HF) model of the grid‐connected inverters is proposed and simulated using Simu...
Conference Paper
Full-text available
In our day the use of Lithium ion battery has considerably increased, especially to feed light electrical vehicle (LEV) application. These types of batteries need careful attention to avoid deep discharge and overcharge. Therefore, a battery management system is mandatory for the real-time monitoring of their main parameters i.e state of charge (So...
Conference Paper
Full-text available
Transformerless single-stage Current Source Inverter (CSI) is a very promising power electronic converter due to its inherent boost capability and ease of control. This paper investigates the performance of two traditional CSI topologies with different switch count (conventional six-switch CSI and seven-switch CSI7), for grid-connected Photovoltaic...
Article
Full-text available
Maximum power point tracking (MPPT) controllers are a key element in photovoltaic (PV) conversion systems since they allow extracting the maximum power from PV generators. Metaheuristic algorithms such as the particle swarm optimisation (PSO) are nowadays widely adopted and have shown their superiority to many other techniques. However, conventiona...
Conference Paper
This paper proposes a chaotic unipolar sinus pulse width modulation (CUSPWM) algorithm for transformerless grid-tied single-phase photovoltaic (PV) inverter. The aim of the study is to reduce electromagnetic interferences (EMI) emitted by a PV inverter. First, a detailed description of theoretical developments is presented. Thereafter, the proposed...
Conference Paper
this paper addresses, for the first time, the open-switch fault detection in a single-phase five-level packed U-cell inverter (PUC5). The proposed detection and isolation method is based on the analysis of only the output voltage signature. This latter reveals a specific distortion caused by the faulty switch. Its identification is achieved upon th...
Article
Electromagnetic interferences (EMI) caused by the high switching frequency of power semiconductors in transformerless single-phase grid-connected photovoltaic (PV) inverters have adverse effects on the lifetime of PV cells and reliability of the electronic and domestic equipment in the neighborhood of the PV installation. This paper proposes a desi...
Conference Paper
Full-text available
Six-Switch current source inverter (CSI) is a promising unidirectional DC-AC power conversion topology deduced from the reversed structure of the very sparse matrix rectifier. This latter is a single-stage boost-type inverter suitable for grid-connected applications as it provides active power injection from renewable energy sources into the AC gri...
Article
Full-text available
This paper proposes and evaluates the performance of a new space vector pulse width modulation (SVPWM) technique for a reduced topology of a three‐phase voltage source inverter namely delta inverter. According to the operation principle of the delta inverter, it is not possible to provide a zero‐voltage vector. Therefore, unlike conventional SVPWM...
Article
Full-text available
Power electronic matrix converters are converters carrying out just one solitary transitional stage. AC-AC conversion automatism in matrix converters is attained through the exploitation of bidirectional controllable power switches associated with a structural matrix. The indirect matrix converter is an alternating preference to the direct matrix c...
Article
Full-text available
Diagnosis of static power converters for distributed power generation systems and electric machines is nowadays a common concern of researchers interested in the reliability of power electronic systems. The conventional diagnosis approaches such as those based on voltage, current, and flux analysis have already been well developed in recent decades...
Article
Full-text available
This paper proposes three new direct power control (DPC) algorithms which minimise the variation of the common mode voltage (CMV) provided by a transformerless grid-connected three-level neutral point clamped (3L-NPC) inverter. The proposed techniques make use of three reduced switching tables designed with the aim to control the active and reactiv...
Conference Paper
This paper proposes a single switch open-circuit fault diagnosis approach for three-phase three-level NPC inverter based on conducted emissions. The proposed approach uses a simple electromagnetic interference (EMI) filter, placed between the DC source and the conversion system, to meter conducted interferences. A time-domain analysis of the voltag...
Conference Paper
This paper proposes a fault detection approach for open-circuit faults in a seven-level cascaded H-bridge (CHB) multilevel inverter. This method utilizes a simple three-phase electromagnetic interferences (EMI) filter placed at the inverter's output, to measure the conducted emissions. The measured voltages across the EMI filter resistors are compa...
Article
Full-text available
This study proposes an efficient field programmable gate array (FPGA) implementation method of an enhanced space vector pulse width modulation (SVPWM) algorithm for a delta inverter. The overall hardware configuration of the FPGA is made graphically using the high-level Xilinx system generator (XSG) programming tools. The proposed descriptive XSG m...
Article
Full-text available
This paper proposes two new open-circuit fault detection methods suitable for the diagnosis of power electronics converters. The faulty semiconductor devices are identified using conducted and radiated electromagnetic signatures of the dc-bus through non-intrusive measurements. The first method uses a low-cost EMI filter to collect the common mode...