This paper presents a simulation study which addresses Demand Side Management (DSM) via schedulin... more This paper presents a simulation study which addresses Demand Side Management (DSM) via scheduling and optimization of a set of residential smart appliances under day-ahead variable pricing with the aim of minimizing the customer’s energy bill. The appliances’ operation and the overall model are subject to the manufacturer and user specific constraints formulated as a constrained linear programming problem. The overall model is simulated using MATLAB and SIMULINK / SimPowerSystems basic blocks. The results comparing Real Time Pricing (RTP) and the Fixed Time Tariff (FTT) demonstrate that optimal scheduling of the residential smart appliances can potentially result in energy cost savings. The extension of the model to incorporate renewable energy resources and storage system is also discussed. Keywords-Demand Side Management; Optimization; Linear Programming; Real Time Pricing; Smart Appliances
This paper presents the design of a fuzzy controller for a three-phase shunt active filter integr... more This paper presents the design of a fuzzy controller for a three-phase shunt active filter integrated in wind-diesel power system equipped with a wind turbine driving an induction generator. The goal for this controller is to maintain a good power quality under varying wind and load conditions. On the other hand, the controller should show acceptable closed-loop performance including stability and robustness. Active power filters as solutions to power quality problems have become more and more important nowadays. The modeling of the wind-diesel standalone system with control algorithm of the shunt active power filter (SAPF) to compensate the current harmonics and the power factor of nonlinear load is considered. A three-phase voltage source bridge inverter with a DC bus capacitor is used as an active filter.
The synergetic control technique (SCT) has the solution for understanding the symmetry inherent i... more The synergetic control technique (SCT) has the solution for understanding the symmetry inherent in the non-linear properties of wind turbines (WTs); therefore, they achieve excellent performance and enhance the operation of the WT. Small-scale WTs are efficient and cost-effective; they are usually installed close to where the generated electricity is used. This technology is gaining popularity worldwide for off-grid electricity generation, such as in rural homes, farms, small factories, and commercial properties. To enhance the efficiency of the WT, it is vital to operate the WT at its maximum power. This work proposes an efficient and fast maximum power point tracking (MPPT) technique based on the SCT to eradicate the drawbacks of the conventional methods and enhance the operation of the WT at the MPP regardless of wind speed and load changes. The SCT has advantages, such as robustness, simplified design, fast response, no requirement for knowledge of WT characteristics, no need fo...
This paper proposes a new approach for the identification of a DC machine (DCM) parameters to bui... more This paper proposes a new approach for the identification of a DC machine (DCM) parameters to build a mathematical model considering different dynamic regimes, which characterize the operation of the studied machine. The proposed solution is simple and is based on the combination of classical identification methods and those available in the identification toolbox of MATLAB. The results obtained experimentally are significantly better and clearly show that the proposed approach is simple to implement and the DCM model is obtained quickly with a reasonable accuracy.
This paper focusses on the design of optimal control strategies for a variable-speed wind energy ... more This paper focusses on the design of optimal control strategies for a variable-speed wind energy system based on Permanent Magnet Synchronous Generator (PMSG). The fractional order PI controller, denoted PIλ, is an extension of the classical PI controller, which provides greater flexibility, better performance and robustness, however the tuning of the controller parameters is challenging. In this work, Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) provide approximate solutions to various problems and form a good optimization. In our system, they are used to have the PI regulator parameters and tune the parameters of the proposed controllers. The proposed controllers have been applied as maximum power point (MPPT) controllers for the wind turbine and to regulate the PMGS currents under variable weather conditions and. The results show that, among all these controllers, the fractional order PI controller optimized by the PSO leads to better performance in terms of the t...
Mahdi Mahfouf, Mouloud Denai, Jonathan Ross, ‘Physiological Modelling of Hemodynamic Effects of S... more Mahdi Mahfouf, Mouloud Denai, Jonathan Ross, ‘Physiological Modelling of Hemodynamic Effects of Simultaneous Administration of Noradrenaline and Dobutamine to Septic Shock Patients in CICU’, paper presented at the 4th IASTED International Conference on Biomedical Engineering, Innsbruck, Austria, 15-17 February, 2006.Peer reviewe
Septic shock is a medical emergency which requires a supportive treatment with vasoactive agents ... more Septic shock is a medical emergency which requires a supportive treatment with vasoactive agents to restore adequate blood pressure and tissue perfusion. Due to the complex medical conditions of septic patients, the identification of the best therapeutic approach remains one of the major challenges for the clinicians. Thus, an improved understanding of the pathophysiological mechanisms of septic shock is needed. A computer model provides a means of quantifying the key phenomena involved and identifying the potential therapeutic targets. This paper presents a comprehensive physiological and pharmacological model of the cardiovascular system that can simulate the hemodynamic response to vasoactive drugs with differing pharmacologic profiles. The model is used to study the interaction of combined noradrenaline and dobutamine therapy in patients with septic shock who typically remain hypotensive despite fluid administration.
Mouloud Denai, Mahdi Mahfouf, Jonathan Ross, ‘A Physiological Model Describing Dobutamine Interat... more Mouloud Denai, Mahdi Mahfouf, Jonathan Ross, ‘A Physiological Model Describing Dobutamine Interation with Septic Patients: A Simulation Study’, paper presented at the 3rd European Medical and Biological Engineering Conference, Prague, Czech Republic, 20-25 November, 2005.
Mohamed AbdeldjabbarKouadria, TayebAllaoui, and Mouloud Denai, “Fuzzy Control of a Three-Phase Sh... more Mohamed AbdeldjabbarKouadria, TayebAllaoui, and Mouloud Denai, “Fuzzy Control of a Three-Phase Shunt Active Filter for Harmonic Current Compensation in Wind-Diesel Standalone System”, U.P.B. Sci. Bull., Series C, Vol. 78 (4), 2016.
This paper presents a comprehensive modelling and control study of a variable speed wind energy c... more This paper presents a comprehensive modelling and control study of a variable speed wind energy conversion system based on a squirrel-cage induction generator (SCIG). The mathematical model of the SCIG is derived in Park frame along with the indirect field oriented control (IFOC) scheme based on a Proportional and Integral (PI) speed controller. A simple Maximum Power Point Tracking (MPPT) strategy is used to determine the optimal speed under variable wind speed conditions which is then used as the reference in the IFOC scheme. Power flow between the supply and the inverter is regulated via simultaneous control of the active and reactive currents of the grid and the DC link voltage. To simplify the logic software and reduce hardware requirements, a programmed PWM based on a look-up table is used to control the inverter switches. The overall model structure is implemented using MATLAB/SIMULINK and SimPowerSystems toolbox. The simulation results show that the proposed control techniqu...
This paper presents a simulation study which addresses Demand Side Management (DSM) via schedulin... more This paper presents a simulation study which addresses Demand Side Management (DSM) via scheduling and optimization of a set of residential smart appliances under day-ahead variable pricing with the aim of minimizing the customer’s energy bill. The appliances’ operation and the overall model are subject to the manufacturer and user specific constraints formulated as a constrained linear programming problem. The overall model is simulated using MATLAB and SIMULINK / SimPowerSystems basic blocks. The results comparing Real Time Pricing (RTP) and the Fixed Time Tariff (FTT) demonstrate that optimal scheduling of the residential smart appliances can potentially result in energy cost savings. The extension of the model to incorporate renewable energy resources and storage system is also discussed. Keywords-Demand Side Management; Optimization; Linear Programming; Real Time Pricing; Smart Appliances
This paper presents the design of a fuzzy controller for a three-phase shunt active filter integr... more This paper presents the design of a fuzzy controller for a three-phase shunt active filter integrated in wind-diesel power system equipped with a wind turbine driving an induction generator. The goal for this controller is to maintain a good power quality under varying wind and load conditions. On the other hand, the controller should show acceptable closed-loop performance including stability and robustness. Active power filters as solutions to power quality problems have become more and more important nowadays. The modeling of the wind-diesel standalone system with control algorithm of the shunt active power filter (SAPF) to compensate the current harmonics and the power factor of nonlinear load is considered. A three-phase voltage source bridge inverter with a DC bus capacitor is used as an active filter.
The synergetic control technique (SCT) has the solution for understanding the symmetry inherent i... more The synergetic control technique (SCT) has the solution for understanding the symmetry inherent in the non-linear properties of wind turbines (WTs); therefore, they achieve excellent performance and enhance the operation of the WT. Small-scale WTs are efficient and cost-effective; they are usually installed close to where the generated electricity is used. This technology is gaining popularity worldwide for off-grid electricity generation, such as in rural homes, farms, small factories, and commercial properties. To enhance the efficiency of the WT, it is vital to operate the WT at its maximum power. This work proposes an efficient and fast maximum power point tracking (MPPT) technique based on the SCT to eradicate the drawbacks of the conventional methods and enhance the operation of the WT at the MPP regardless of wind speed and load changes. The SCT has advantages, such as robustness, simplified design, fast response, no requirement for knowledge of WT characteristics, no need fo...
This paper proposes a new approach for the identification of a DC machine (DCM) parameters to bui... more This paper proposes a new approach for the identification of a DC machine (DCM) parameters to build a mathematical model considering different dynamic regimes, which characterize the operation of the studied machine. The proposed solution is simple and is based on the combination of classical identification methods and those available in the identification toolbox of MATLAB. The results obtained experimentally are significantly better and clearly show that the proposed approach is simple to implement and the DCM model is obtained quickly with a reasonable accuracy.
This paper focusses on the design of optimal control strategies for a variable-speed wind energy ... more This paper focusses on the design of optimal control strategies for a variable-speed wind energy system based on Permanent Magnet Synchronous Generator (PMSG). The fractional order PI controller, denoted PIλ, is an extension of the classical PI controller, which provides greater flexibility, better performance and robustness, however the tuning of the controller parameters is challenging. In this work, Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) provide approximate solutions to various problems and form a good optimization. In our system, they are used to have the PI regulator parameters and tune the parameters of the proposed controllers. The proposed controllers have been applied as maximum power point (MPPT) controllers for the wind turbine and to regulate the PMGS currents under variable weather conditions and. The results show that, among all these controllers, the fractional order PI controller optimized by the PSO leads to better performance in terms of the t...
Mahdi Mahfouf, Mouloud Denai, Jonathan Ross, ‘Physiological Modelling of Hemodynamic Effects of S... more Mahdi Mahfouf, Mouloud Denai, Jonathan Ross, ‘Physiological Modelling of Hemodynamic Effects of Simultaneous Administration of Noradrenaline and Dobutamine to Septic Shock Patients in CICU’, paper presented at the 4th IASTED International Conference on Biomedical Engineering, Innsbruck, Austria, 15-17 February, 2006.Peer reviewe
Septic shock is a medical emergency which requires a supportive treatment with vasoactive agents ... more Septic shock is a medical emergency which requires a supportive treatment with vasoactive agents to restore adequate blood pressure and tissue perfusion. Due to the complex medical conditions of septic patients, the identification of the best therapeutic approach remains one of the major challenges for the clinicians. Thus, an improved understanding of the pathophysiological mechanisms of septic shock is needed. A computer model provides a means of quantifying the key phenomena involved and identifying the potential therapeutic targets. This paper presents a comprehensive physiological and pharmacological model of the cardiovascular system that can simulate the hemodynamic response to vasoactive drugs with differing pharmacologic profiles. The model is used to study the interaction of combined noradrenaline and dobutamine therapy in patients with septic shock who typically remain hypotensive despite fluid administration.
Mouloud Denai, Mahdi Mahfouf, Jonathan Ross, ‘A Physiological Model Describing Dobutamine Interat... more Mouloud Denai, Mahdi Mahfouf, Jonathan Ross, ‘A Physiological Model Describing Dobutamine Interation with Septic Patients: A Simulation Study’, paper presented at the 3rd European Medical and Biological Engineering Conference, Prague, Czech Republic, 20-25 November, 2005.
Mohamed AbdeldjabbarKouadria, TayebAllaoui, and Mouloud Denai, “Fuzzy Control of a Three-Phase Sh... more Mohamed AbdeldjabbarKouadria, TayebAllaoui, and Mouloud Denai, “Fuzzy Control of a Three-Phase Shunt Active Filter for Harmonic Current Compensation in Wind-Diesel Standalone System”, U.P.B. Sci. Bull., Series C, Vol. 78 (4), 2016.
This paper presents a comprehensive modelling and control study of a variable speed wind energy c... more This paper presents a comprehensive modelling and control study of a variable speed wind energy conversion system based on a squirrel-cage induction generator (SCIG). The mathematical model of the SCIG is derived in Park frame along with the indirect field oriented control (IFOC) scheme based on a Proportional and Integral (PI) speed controller. A simple Maximum Power Point Tracking (MPPT) strategy is used to determine the optimal speed under variable wind speed conditions which is then used as the reference in the IFOC scheme. Power flow between the supply and the inverter is regulated via simultaneous control of the active and reactive currents of the grid and the DC link voltage. To simplify the logic software and reduce hardware requirements, a programmed PWM based on a look-up table is used to control the inverter switches. The overall model structure is implemented using MATLAB/SIMULINK and SimPowerSystems toolbox. The simulation results show that the proposed control techniqu...
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