In this paper, the problem of controlling the single-phase grid connected to the photovoltaic system based on a 3-level half-bridge neutral point inverter with an L-filter is presented. The proposed controller is designed to meet three... more
In this paper, the problem of controlling the single-phase grid connected to the photovoltaic system based on a 3-level half-bridge neutral point inverter with an L-filter is presented. The proposed controller is designed to meet three main control objectives: (i) regulating the capacitor voltages at the inverter input to a reference provided by the MPPT block to achieve maximum power, (ii) satisfying the power factor correction (PFC) requirement, (iii) balanced power exchange by regulating the two capacitor voltages at the inverter input to the same voltage value. The controller includes three control loops, namely, the inner current tracking loop designed with the integral sliding mode approach, the outer voltage regulation loop designed with the filtered PI controller, and the voltage balance loop designed with the PI controller. The performance, efficiency, and robustness of the proposed control strategies with respect to climate change are demonstrated through simulation in the Matlab/Simulink environment.
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We consider the problem of controlling single-phase shunt active power filter operating in presence of nonlinear loads. The filter is connected to PV system; this latter provides the active power to load. The main control objectives are:... more
We consider the problem of controlling single-phase shunt active power filter operating in presence of nonlinear loads. The filter is connected to PV system; this latter provides the active power to load. The main control objectives are: (i) compensation of harmonics current and the reactive power caused by the nonlinear load; (ii) regulation of the output voltage of PV system to track its reference provided by the MPPT block. The problem is dealt with a nonlinear controller involving two regulators in cascade. The PFC regulator is developed by using the Lyapunov technique to cope with the compensation issue based on the estimated grid voltage values provided by an observer. The outer-loop regulates the output voltage of PV system. The proposed controller performances are confirmed by simulation in MATLAB\Simulink.
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In this paper, considering the problem of control the full bridge shunt active power filter operating with nonlinear loads. The main control objectives are: (i) compensation of harmonics current and the reactive power caused by the... more
In this paper, considering the problem of control the full bridge shunt active power filter operating with nonlinear loads. The main control objectives are: (i) compensation of harmonics current and the reactive power caused by the nonlinear load in order to ensure a perfect power factor correction (PFC) at the point of common coupling (PCC); (ii) regulation the DC voltage of inverter. A nonlinear control strategy is proposed to achieve the main objectives taking into account of grid impedance, and of all non negligible parameters of circuit. The inner-loop control is designed, using the Lyapunov technique, to cope with the compensation issue. The outer-loop control ensures the DC voltage regulation of inverter. The control performances are analyzed using the averaging theory. Simulation results show the achievement of above objectives and also the effectiveness of the proposed control.
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This study proposes and discusses a single-stage off-grid PV system to supply power to DC loads. A single-buck converter interfaces a 2 kW PV array and DC load and ensures a good operation of the... more
This study proposes and discusses a single-stage off-grid PV system to supply power to DC loads. A single-buck converter interfaces a 2 kW PV array and DC load and ensures a good operation of the maximum power point tracking (MMPT) and battery charge control, simultaneously. For the MPPT side, an improved adaptable step size P&O approach is suggested to reach the real maximum power point (MPP) of the solar PV array under varying weather conditions with reduced steady-state oscillation and less power loss. Furthermore, a three-stage charging controller (TSCC) is used in the battery charge control side to charge a 200 Ah lead-acid battery. MATLAB/Simulink environment tool is used for the implementation of the overall PV system. The simulation results under different scenarios of weather conditions prove the highest tracking performances of the improved approach over the conventional P&O method. In this respect, the developed P&O approach can capture the MPP in a time less than 2 milliseconds, which is 10 times faster than the conventional P&O method. In addition, it can mitigate the power losses and reduce the oscillations around the MPP to half compared with the basic P&O method. Furthermore, the improved P&O approach with TSCC can significantly enhance the BS charging operation with good stability in the output power, voltage, and current of the battery.
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This paper develops and discusses an improved MPPT approach for temperature variation with fast-tracking speed and reduced steady-state oscillation. This MPPT approach can be added to numerous existing MPPT algorithms in order to enhance... more
This paper develops and discusses an improved MPPT approach for temperature variation with fast-tracking speed and reduced steady-state oscillation. This MPPT approach can be added to numerous existing MPPT algorithms in order to enhance their tracking accuracy and response time and to reduce the power loss. The improved MPPT method is fast and accurate to follow the maximum power point under critical temperature conditions without increasing the implementation complexity. The simulation results under different scenarios of temperature and insolation were presented to validate the advantages of the proposed method in terms of tracking efficiency and reduction of power loss at dynamic and steady-state conditions. The simulation results obtained when the proposed MPPT technique was added to different MPPT techniques, namely, perturb and observe (P&O), incremental conductance (INC), and modified MPP-Locus method, show significant enhancements of the MPP tracking performances, where the...
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This paper proposes a novel algorithm for maximum power point tracking (MPPT) in photovoltaic panel sourced boost converter. The novel MPPT tactic has a high convergence speed and zero oscillation around the MPP under steady state... more
This paper proposes a novel algorithm for maximum power point tracking (MPPT) in photovoltaic panel sourced boost converter. The novel MPPT tactic has a high convergence speed and zero oscillation around the MPP under steady state operation, and high tracking speed in response to rapid changing of irradiance. Furthermore, it improves the tracking accuracy, without increase the implementation complexity. The proposed technique has been simulated in Matlab/Simulink environment and compared with some other MPPT techniques, such as Perturbed and observed (P & O), Increment of Conductance (INC) and fuzzy logic (FLC).
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The paper presents a nonlinear control of shunt active power filter operating in presence of nonlinear loads. The said filter is connected to PV system in order to deliver the active power to load. The main control objectives are: (i)... more
The paper presents a nonlinear control of shunt active power filter operating in presence of nonlinear loads. The said filter is connected to PV system in order to deliver the active power to load. The main control objectives are: (i) compensation of harmonic currents and the reactive power caused by the nonlinear load; (ii) regulation the DC bus voltage of inverter. The control problem is dealt with a nonlinear controller that is developed by using the Lyapunov technique to cope with the harmonic's issue. The outer-loop regulates the DC bus voltage of the static converter. The controller performances are validated by simulation in MATLAB\\Simulink.
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Enhancing PV system performance and efficiency requires improving the extraction of the maximum available power from the PV generator and reducing the output losses from the using DC-DC converter. A new proposed MPPT technique in the... more
Enhancing PV system performance and efficiency requires improving the extraction of the maximum available power from the PV generator and reducing the output losses from the using DC-DC converter. A new proposed MPPT technique in the second cited references is used to track the available maximum power (MPP) from the PV generator. On the other hand, the interleaved boost converter is used to minimizing the output current, voltage and power ripples. Two simulation scenarios are provided to examine and evaluate the tracking effectiveness of the proposed MPPT technique using the interleaved boost converter. The first one is carried out under sudden variation of solar irradiation however the second is made under slow variation of solar irradiation. The simulation results demonstrate the good performance of the proposed approach combining the new proposed MPPT algorithm with the interleaved boost converter compared to the conventional boost converter. The simulation implementation is carried out using MATLAB/Simulink software tool.
Research Interests: Computer Science, PV system simulation, Solar PV, Solar PV Systems Installation, power electronics and PV system, and 11 moreMPPT method for photovoltaic, Boost Converter, solar cell MPPT algorithm & its application, Maximum Power Point Tracking, Photovoltaic system, MPPT Algorithm, Mppt Design for Pv Application, PV cell/module, commande MPPT et MLI sous Matlab Simulink, Interleaved Boost Converter and its applications, and Interleaved Boost Converter
This work addresses the problem of controlling single-phase half bridge series active power filter (SAPF) in presence of perturbations in single-phase power supply grid voltage. The control objective of the SAPF is to compensate the... more
This work addresses the problem of controlling single-phase half bridge series active power filter (SAPF) in presence of perturbations in single-phase power supply grid voltage. The control objective of the SAPF is to compensate the voltage perturbations (voltage harmonics and voltage sags) in order to protect the sensitive load against the disturbances mentioned above. A nonlinear controller is designed, using the Backstepping technique, to cope with the compensation issue. A stability analysis is carried out using average theory to describe the control performances. These latter have been validated by numerical simulation in MATLAB/ SIMULINK.
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This paper is aimed at harvesting the photovoltaic systems extracting power under difficult irradiance and load conditions, by proposing a novel maximum power point tracking (MPPT). This proposed MPPT tactic has been examined under... more
This paper is aimed at harvesting the photovoltaic systems extracting power under difficult irradiance and load conditions, by proposing a novel maximum power point tracking (MPPT). This proposed MPPT tactic has been examined under various climatic and load conditions using two powerful and accurate simulation environments for PV systems, MATLAB/Simulink and Proteus. The first implementation using the MATLAB/Simulink software was carried out to examine the performance of the novel MPPT tactic under sudden insolation and load change, where the second implementation using the Proteus software was carried out in order to prove that the novel MPPT tactic can be easily implemented using low-cost components, Arduino board, and LCD display. The simulation results prove that the novel MPPT tactic has a high convergence speed to locate the MPP, especially at fast solar irradiation and load variation with zero oscillation under steady-state operation, which takes less than 9.6 milliseconds (m...
Research Interests: Computer Science, Matlab, Arduino, Software, PV system simulation, and 14 moreMPPT method for photovoltaic, Matlab & Simulink programming, Dc-Dc Boost Converter, solar cell MPPT algorithm & its application, solar PV power plants, Maximum Power Point Tracking, Pv System, Photovoltaic system, Mppt Design for Pv Application, PV cell/module, Photovoltaic (PV) Systems, Proteus, Arduino Uno, and Incremental Conductance Mppt
This paper addresses an open circuit fault (OCF) diagnosis method and a fault-tolerant control for a non-isolated interleaved boost converter to optimize reliability. The studied structure is based on interleaved boost converter ensuring... more
This paper addresses an open circuit fault (OCF) diagnosis method and a fault-tolerant control for a non-isolated interleaved boost converter to optimize reliability. The studied structure is based on interleaved boost converter ensuring maximum power operation and a full bridge converter allowing the regulation of the battery voltage. Unlike several other works in the literature which are generally based on the inductor current or the slope of this current, the proposed method is based on the measurement of the inductor voltage in addition to the diode and switch voltages. To generalize, the detection principle is applied to the others phases of the interleaved dc-dc converter. Once the open switch failure position is detected, a reconfiguration is established allowing the interleaved dc-dc boost converter to continue to operate using the three phases and replacing the faulty switch with arm of the full bridge converter. The major advantage of the proposed method is its simplicity ...
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The target of this paper is the enhancing of the PV system performance by the improving of the PV and DC-DC boost converter output power. In the PV side, a new proposed MPPT technique in [1] is used to track the available maximum power... more
The target of this paper is the enhancing of the PV system performance by the improving of the PV and DC-DC boost converter output power. In the PV side, a new proposed MPPT technique in [1] is used to track the available maximum power (MPP). On the other hand, in the boost converter side, high ripples minimizing are obtained in the output power, current and voltage. Next, three tests simulation under stable and variable solar irradiation are carried out to examine and evaluate the tracking effectiveness of the proposed MPPT technique compared with the celebrate Increment of Conductance (INC) MPPT method. The simulation results prove the best performance and the good ripples minimizing in the input and output side of the boost converter using the proposed MPPT tactic, where the ripple amplitude can be reduced six times compared to the INC MPPT method. In addition, the proposed MPPT tactic presents a better efficiency in the both static and dynamic conditions with an average value attending 99.86% and 99.6%, respectively, compared to the INC MPPT method which presents an average efficiency of 94.23% and 95.28% in static and dynamic conditions respectively. In this work, the MATLAB/Simulink tool was used in the simulation implementation.
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This paper deals with the application of the method called ripple correlation speed (RCS) in a power wind conversion system (PWCS) based a permanent magnet synchronous generator (PMSG). This method is widely used in photovoltaic systems... more
This paper deals with the application of the method called ripple correlation speed (RCS) in a power wind conversion system (PWCS) based a permanent magnet synchronous generator (PMSG). This method is widely used in photovoltaic systems for optimal maximum power point determination. The contribution of this work is the use of two electrical sensors instead of mechanical sensors in order to find the maximum power point (MPP). This method is justified by a ratio of proportionality between the mechanical speed of the (PMSG) generator and the output voltage of the three-phase rectifier. The reading of the power curve as a function of the output voltage of the three-phase rectifier showed that the optimum point has a maximum according to the wind speed. The desired point is characterized by a determined voltage. This observation allows to apply the ripple correlation between power and voltage at the output of the three-phase rectifier. The (PMSG) generator associated with the three-phase...
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This study aims to apply the ripple correlation current (RCC) approach, which is an MPPT search algorithm used in photovoltaic systems. To extract the maximum power, a wind conversion structure based on a permanent magnet synchronous... more
This study aims to apply the ripple correlation current (RCC) approach, which is an MPPT search algorithm used in photovoltaic systems. To extract the maximum power, a wind conversion structure based on a permanent magnet synchronous generator (PMSG), a three-phase rectifier and a boost converter is used. The choice of this structure is justified by the reliability, simplicity of implementation and control. This paper discusses the performance evaluation of a MPPT algorithms called RCC (ripple correlation current) in comparison with the conventional methods. To achieve this objective, four criteria are chosen: speed convergence, need of mechanical sensors, accuracy and dependence of the previous position. The main features presented in this paper are as follows: (a) modeling the power wind conversion systems, (b) presenting and detailing each MPPT algorithm (c) showing the proposed RCC MPPT and it implementation results, (d) conducting a discussion and give an evaluation performance of the proposed approach according to the criteria cited in comparison with the conventional methods.
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This work proposes a Self-Scheduled Fuzzy Control (SSFC) of PWM DC-DC Converters. The main difficulty in controlling these systems stems from their non linear nature as their switched circuit topology entails different modes of operation.... more
This work proposes a Self-Scheduled Fuzzy Control (SSFC) of PWM DC-DC Converters. The main difficulty in controlling these systems stems from their non linear nature as their switched circuit topology entails different modes of operation. Based on the Takagi-Sugeno Fuzzy Modelling approach with the duty ratio as premise variable, the converter model can be derived in every operating point. For
Research Interests: Mathematics, Fuzzy Logic, Fuzzy Inference, Fuzzy Control, Transfer Function, and 11 moreBoost Converter, Dc-Dc Boost Converter, Converters, Pulse Width Modulation, Linear Quadratic regulator, Fuzzy Modelling, Duty Cycle, Inductor, State Feedback, Parallel distributed compensation, and Fuzzy Control System
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The design and the implementation of a fuzzy output tracking control applied to a boost converter that operates in large-signal domain are presented. Unlike conventional fuzzy controller design which addresses only small-signal system... more
The design and the implementation of a fuzzy output tracking control applied to a boost converter that operates in large-signal domain are presented. Unlike conventional fuzzy controller design which addresses only small-signal system control and stability, the proposed controller ensures good tracking performances and overall large-signal stability of the system over the whole operating space. This is thanks to: i) The high prediction accuracy of the Takagi-Sugeno fuzzy approximator (TSFA) with twelve affine functions; ii) the possibility to automatically derive the corresponding small-signal model under a wide range of operating conditions; iii) the advantage of integral controllers; and iv) the LMI approach to carry out the overall large-signal stability. After introducing an added integral state of the output tracking error, the resulting augmented system is represented into a Takagi-Sugeno fuzzy model (TSFM). Parallel distributed compensation (PDC) concept is applied to design the state-feedback based control law whereby the control gains are off-line pre-solved by the mean of the linear quadratic regulator (LQR) technique. Sufficient stability conditions are expressed in terms of LMIs. Experimental results using dSPACE DS1104 and a boost converter for different operating conditions, both in tracking and regulation mode; illustrate the efficiency, the robustness and the flexibility of the proposed approach relatively to a classical PID controller.
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The purpose of this paper is to enhance the performance and tracking efficiency of solar photovoltaic systems. This aim can be achieved by operating the photovoltaic array at its optimum power and reducing the output ripple problem of... more
The purpose of this paper is to enhance the performance and tracking efficiency of solar photovoltaic systems. This aim can be achieved by operating the photovoltaic array at its optimum power and reducing the output ripple problem of DC-DC converters that affect and stress sensible electronic loads. In view of that, an advanced maximum power point (MPP) tracking (MPPT) scheme, which can guarantee zero oscillation tracking of the accessible MPP and less ripple magnitude on the output side of the DC-DC boost converter, is used. Various simulations are carried out under three conditions of solar irradiance variation, namely, standard test conditions (STC), rapid, and Sin scenarios, using the MATLAB/Simulink® environment, to assess and benchmark the robustness of the tracking of the new MPPT scheme over the celebrated Increment of Conductance (INC) MPPT scheme. Based on the simulation results, the proposed scheme can significantly improve tracking accuracy and reduce the magnitude of r...
This study addresses the problem of controlling series active power filters for voltage sag compensation. Indeed, we can control this kind of filter to generate a voltage series that compensates the grid voltage sag in order to protect... more
This study addresses the problem of controlling series active power filters for voltage sag compensation. Indeed, we can control this kind of filter to generate a voltage series that compensates the grid voltage sag in order to protect the sensitive loads against this perturbation. This study is aimed at seeking a control strategy that meets the main control objective, which is the compensation of grid voltage sags and this by considering the following technical constraints: (i) the nonlinearity of the system dynamics, (ii) the high dimension of the system model, and (iii) the inaccessibility of some system variables to measurements. To meet the main control objective, we propose a nonlinear controller that is designed based on the system nonlinear model, using the backstepping technique. This controller involves a nonlinear regulator and a grid observer. The former copes with the compensation issue. The observer provides online the grid voltage estimations. In addition to a theoret...
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This paper develops and discusses an improved MPPT approach for temperature variation with fast-tracking speed and reduced steady-state oscillation. This MPPT approach can be added to numerous existing MPPT algorithms in order to enhance... more
This paper develops and discusses an improved MPPT approach for temperature variation with fast-tracking speed and reduced steady-state oscillation. This MPPT approach can be added to numerous existing MPPT algorithms in order to enhance their tracking accuracy and response time and to reduce the power loss. The improved MPPT method is fast and accurate to follow the maximum power point under critical temperature conditions without increasing the implementation complexity. The simulation results under different scenarios of temperature and insolation were presented to validate the advantages of the proposed method in terms of tracking efficiency and reduction of power loss at dynamic and steady-state conditions. The simulation results obtained when the proposed MPPT technique was added to different MPPT techniques, namely, perturb and observe (P&O), incremental conductance (INC), and modified MPP-Locus method, show significant enhancements of the MPP tracking performances, where the...
Research Interests:
This paper is aimed at harvesting the photovoltaic systems extracting power under difficult irradiance and load conditions, by proposing a novel maximum power point tracking (MPPT). This proposed MPPT tactic has been examined under... more
This paper is aimed at harvesting the photovoltaic systems extracting power under difficult irradiance and load conditions, by proposing a novel maximum power point tracking (MPPT). This proposed MPPT tactic has been examined under various climatic and load conditions using two powerful and accurate simulation environments for PV systems, MATLAB/Simulink and Proteus. The first implementation using the MATLAB/Simulink software was carried out to examine the performance of the novel MPPT tactic under sudden insolation and load change, where the second implementation using the Proteus software was carried out in order to prove that the novel MPPT tactic can be easily implemented using low-cost components, Arduino board, and LCD display. The simulation results prove that the novel MPPT tactic has a high convergence speed to locate the MPP, especially at fast solar irradiation and load variation with zero oscillation under steady-state operation, which takes less than 9.6 milliseconds (m...