Jean-Paul Gaubert

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• Ing Dr PhD HDR
• Full Professor at Université de Poitiers

This paper presents a new controller based on the Lyapunov theory used in a stand-alone photovoltaic (PV) system. The proposed system does not include a pulse width modulation (PWM) controller unlike a traditional one. The quadratic converter including one controllable switch is modeled as a switching system which allows us to propose a switching r...

This paper presents a combination between a fuzzy logic control (FLC) and a predictive direct power control for multifunctional grid connected photovoltaic (PV) system, to solve the oscillation problem in the DC link voltage of the in-verter caused by the fast irradiation changing. The whole system consists of a PV system which interface a DC-AC in...

This paper proposes a multi-objective H2/H ∞ maximum power tracking control of a variable speed wind turbine to minimize the H2 tracking error and ensure the H ∞ model reference-tracking performance, simultaneously. The optimal condition is obtained via a boost converter use, which adapts the load impedance to the wind turbine generator. Thus, base...

Aiming to take full advantage of Electric Vehicles' (EVs) batteries, this paper proposes a two-level hierarchical model predictive controller coupled with an innovative charging-discharging scheduler for EVs in Building Microgrids (BMGs). This paper provides a complete framework for the design of this control structure and analyses its performance...

Photovoltaic (PV) systems, being one of the promising power generation systems, need performance optimization typically under partial shading conditions (PSCs). In such non-uniform irradiation conditions, not only conventional maximum power point tracking (MPPT) algorithms but also advanced techniques fail in operating at the power peak. So, global...

Hydrogen energy storage has emerged as a promising technology to improve the integration of renewable energy sources in building microgrids. However, inaccuracies in the modelling of fuel cells and electrolysers reduce the performance of building microgrids' energy management system. To improve the flexibility of building microgrids, this paper pro...

Based on the Fast Terminal Synergetic (FTS) approach, a powerful non-linear Maximum Power Point Tracking (MPPT) controller for standalone photovoltaic (PV) systems is developed and presented in this paper. The PV system mainly contains a PV array, a boost converter, an MPPT controller and a resistive load. The proposed MPPT controller contains two...

Aiming to take full advantage of Electric Vehicles' (EVs) batteries despite unpredictability in their arrival and departure time, in this paper, a two-level hierarchical model predictive controller coupled with an innovative charging-discharging scheduler for EVs in building microgrids is proposed. Besides providing a complete framework for its des...

This paper discusses a renewable energy system connected to a dual-function power grid through a shunt active power filter to improve the power quality and inject photovoltaic (PV) energy to the power grid in the presence of nonlinear loads. Disturbance rejection for this electrical network is provided by the proposed direct power control (DPC) com...

Les systèmes de stockage sont des éléments clefs pour permettre la conception de micro-réseaux dédiés aux bâtiments. Cependant, les imprécisions des modèles mathématiques des batteries, dû aux effets de la température et de leur vieillissement peuvent réduire les performances d’un système micro-réseaux. Cet article présente un contrôleur par modèle...

L’objectif de cette étude est d’améliorer le rendement d’un système photovoltaïque. Le travail est axé sur l’étage d’adaptation entre le panneau photovoltaïque et la charge. Au niveau de l’architecture de la chaîne d’adaptation, une comparaison entre le convertisseur élévateur quadratique utilisé dans notre projet et une topologie boost simple est...

Abstract A novel nonlinear maximum power point tracking (MPPT) controller for autonomous photovoltaic systems based on synergetic control theory is presented in this paper as a solution to eliminate the chattering drawback provided by sliding mode controller, where the proposed strategy allows to generate continuous control law instead of a switchi...

Hybrid energy storage systems have been increasingly envisaged for building microgrids to soften the drawbacks arising from the unpredictability of renewable energy resources and dwelling occupancy. The combination of long- and short-term energy storage systems can enhance the building microgrid capacity of shifting the demand peak toward periods o...

This paper deals with a shunt active power filter (SAPF) integrated in a photovoltaic (PV) system, which is interfaced to the grid via a double-stage configuration, for simultaneously improving the power quality in the existence of non-linear loads and injecting the PV harvested power to the power grid. The direct power control (DPC) based on the c...

Energy storage systems are key elements for enabling the design of MicroGrids in buildings, specially to deal with stochastic renewable energy resources and to promote peak shifting. However, inaccuracies in the batteries' mathematical models due to temperature and ageing effects can reduce the performance of a MicroGrid system. To tackle these unc...

This paper proposes a control strategy for a three-phase Z-source inverter using a modified discontinuous space vector modulation. The main advantages of the proposed control strategy are the enhanced output power quality and the compromise in the reduction between conduction and switching losses. Furthermore. The reduced switching losses are achie...

The integration of the z-source inverter in the (PV) generation system has been very popular among researchers, Due to its ability to boost the PV voltage and its low cost. This paper presents the application of the particle swarm optimization (PSO) algorithm in the Z-source inverter, for maximizing output power of photovoltaic (PV) array under par...

The integration of the z-source inverter in the (PV) generation system has been very popular among researchers, Due to its ability to boost the PV voltage and its low cost. This paper presents the application of the particle swarm optimization (PSO) algorithm in the Z-source inverter, for maximizing output power of photovoltaic (PV) array under par...

Building microgrids have emerged as an advantageous alternative for tackling environmental issues while enhancing the electricity distribution system. However, uncertainties in power generation, electricity prices and power consumption, along with stringent requirements concerning power quality restrain the wider development of building microgrids....

In order to overcome the disadvantages of conventional DPC control, this paper proposes a combination of direct power control with space vector modulation used in shunt active power filter. For this reason, from the beginning, every efforts will be directed towards developing a control strategy that achieves the best results by reducing current THD...

Renewable energy sources are increasingly deployed as distributed generators, restructuring the traditional electrical grid toward smart grids. Their intermittent power generation makes difficult the development of a complete carbon-free MicroGrid. Hence, aiming to keep the safe operation of a building MicroGrid (BMG) under stochastic variations in...

This paper addresses the design of a robust Maximum Power Point Tracking (MPPT) controller for a small wind energy conversion system fed by a Permanent Magnet Synchronous Generator (PMSG). The proposed MPPT controls the generator rectified voltage instead of the rotational speed avoiding the need for a mechanical sensor. Traditionally, this control...

This paper presents a simulation study including a predictive direct power control strategy to improve the performance of photovoltaic system connected to the grid associate with shunt active power filter. The PDPC is proposed to compensate the reactive power and to inject the active power into the grid. A fuzzy logic algorithm is suggested to trac...

Predictive direct power control (P-DPC) has been suggested as an effective alternative to the conventional direct power control (DPC) applied to PWM converter such as active power filter (APF) and PWM rectifier. It is characterized by a high transient dynamic, which makes it an interesting alternative for conventional direct power control (DPC). Fu...

The photovoltaic (PV) generation system becomes important as renewable energy sources, due to its advantages such as absence of fuel cost, low maintenance requirement, and environmental friendliness, the integration of the z-source inverter in the (PV) generation system has been very popular among researchers, due to its ability to boost the PV vol...

In this paper we present a new maximum power point tracking algorithm based on a modified Perturb and Observe (P&O) algorithm. The proposed algorithm is a dual mode one, the switching between the two modes is based on the value of the derivative of the power with respect to the voltage at the output of the solar panel, which must be null at the max...

The present paper proposes a simulation and a real time implementation of a new fuzzy-direct power control (F-DPC) strategy for power quality improvement in shunt active power filter systems. The main objective of the proposed study is to reduce the total harmonic current distortion (THDi) and the instantaneous power ripple. This is done by the rep...

Maximum Power Point Tracking (MPPT) methods are used in photovoltaic (PV) systems to continually maximize the PV array output power, which strongly depends on both solar radiation and cell temperature. The PV power oscillations around the maximum power point (MPP) resulting from the conventional methods and complexity of the non-conventional ones a...

Predictive control is a very large control category. It has found a fairly current application in the mastery and the control of power converters. This paper presents a simulation study which includes a control strategy to improve the performance of a double stage photovoltaic system connected to the network associate with shunt active power filter...

This paper proposes a predictive direct power control for shunt active power filters. The main goal of the proposed active filtering system is to eliminate the unwanted harmonics and compensate fundamental reactive power drawn from the non-linear loads. The proposed control is characterized by a high transient dynamic, which makes it an interesting...

The present paper suggests a simulation study for a grid connected photovoltaic system, associated to a shunt active power filter (SAPF). On the one hand, to extract the maximum power from the PV generator a fuzzy logic Maximum power taking point (MPPT) is proposed in order to track permanently the optimum point. On the other hand, direct power con...

The present paper suggests a simulation study for a grid connected photovoltaic system, associated to a shunt active power filter (SAPF). On the one hand, to extract the maximum power from the PV generator a fuzzy logic Maximum power taking point (MPPT) is proposed in order to track permanently the optimum point. On the other hand, direct power con...

Predictive direct power control (P-DPC) has been suggested as an effective alternative to the conventional direct power control (DPC) applied to PWM converter such as rectifier and active power filter (APF). It is characterized by a high transient dynamic, which makes it an interesting alternative for classic direct power control. Moreover, in the...

This paper presents supervision and control power system for photovoltaic generators with battery storage. The system consists of a photovoltaic (PV) generators and a battery bank supplying kept a load. Two applications are presented throughout this paper. In the first one, the load is made variable while in the second it is considered constant in...

In this paper, simulation and practical implementation of direct power control is presented for a PWM Rectifier application. The proposed DPC control has several advantages, including the grid current very close to sinusoidal waveforms (TDH <1.2%), and good regulation of DC-bus voltage is achieved using the PI controller. The simulation and the exp...

This study deals with a three-phase double-stage multifunctional grid-connected inverter interfaced with a photovoltaic system. The studied system consists of a photovoltaic array, a dc-dc boost converter and a three-phase voltage source inverter connected to the utility at the point of common coupling. To ensure the multifunctional feature, we pro...

The real implementation of sliding mode controllers (SMCs) to a DC-DC boost converter is a challenge due to the nonminimum phase behavior of these kinds of converters and the SMCs chattering problem. In this paper, new integral sliding mode control laws with linear and proposed nonlinear sliding surfaces are developed to overcome these problems. An...

In this paper we present a new control strategy and a comparison between the performance of a simple and a quadratic DC/DC boost converters when controlled by the proposed controller. They are usually used in the adaptation stage of solar energy systems. The control law is a switching rule based on Lyapunov theory coupled to a conventional perturb...

Abstract In this article, a grid-connected photovoltaic system with functionality of power quality enhancement is studied. The integration of the photovoltaic generator into the grid takes place in one stage, using a three-phase voltage source inverter. A direct power control algorithm strategy with a new switching table has been proposed to decre...

pre>In order to deal with the boost converter non minimum phase property and to solve the Sliding Mode Control (SMC) major problem (the chattering phenomenon), a new backstepping Sliding Mode Controller is developed. In this paper, a comparative study between the proposed controller and the (2-SMC)super twisting and the classical SMC is provided in...

Most maximum power point tracking (MPPT) techniques based on sliding-mode control (SMC) use another method such as perturb and observe or incremental conductance (IncCond) to provide current or voltage reference which makes the system more complex. To reduce the complexity and to increase the photovoltaic (PV) array efficiency, a direct control hig...

This paper proposes a fuzzy control method for tracking maximum power point in photovoltaic (PV) power systems to solve a fast irradiation change problem. Perturb and Observe (P&O) is known as a very simple maximum power point tracking and is extensively disseminated. Fuzzy logic is also simple to investigate and provides fast dynamics. The suggest...

In this paper a network reconfiguration model aimed to be used in an industrial context is presented. It is based on a min-cost flow problem (MCFP) and a simplified power flow calculation. Mixed Integer Quadratic Constrained Programming (MIQCP) and Mixed Integer Non linear Programming (MINLP) are used and compared to compute the network reconfigura...

RESUME – Ce travail est consacré à l'étude d'un générateur solaire photovoltaïque connecté au réseau de distribution et participant à l'amélioration de la qualité de l'énergie au point de connexion grâce aux fonctionnalités de filtrage actif. Une commande directe de puissance (DPC) est développée pour contrôler simultanément la puissance active pho...

This article deals with shunt active power filtering for power quality improvement with hysteresis current controllers by two methods of implementation assessed under unfavorable non-linear load and source conditions. Fully digital and simple hybrid hysteresis control strategies are tested based on a numerical integrator proportional DC bus control...

In this work, nonlinear control of a three-phase shunt active power filter (SAPF) has been studied and compared to classical control based on proportional integral regulator. The control strategy is based on the direct current method using sliding mode control (SMC), where the aim is to regulate the average voltage across the dc bus of the inverter...

This paper presents a new control strategy for a quadratic boost converter used in solar energy system. The proposed control strategy is based on Lyapunov theory that provides the stability of the converter considered as a switched affine system, it also allows a maximum power extraction by fixing the operating point near of the maximum power point...

Tracking the maximum power point (MPP) has a great interest in the study of photovoltaic (PV) systems. This task is very difficult due to the non linearity of PV current-voltage characteristics which are dependent on the temperature and irradiation conditions. The sliding mode control (SMC) based MPPT with two different step sizes designed for Boos...

In this work, nonlinear control of a three-phase shunt active power filter (SAPF) has been studied and compared to classical control based on proportional integral regulator. The control strategy is based on the direct current method using sliding mode control (SMC), where the aim is to regulate the average voltage across the dc bus of the inverter...

The choice and design of a high efficient maximum power point tracking (MPPT) algorithm is a necessity in the PV system design. Many approaches have been proposed in literature, among them, the methods that are based on perturb and observe (P&O), widely used in commercial products due their simplicity and ease of implementation. In this paper, a ne...

Most maximum power point tracking (MPPT) techniques based on sliding mode control (SMC) use another method such perturb and observe (P&O) or incremental conductance (IncCond) to provide current or voltage reference which makes the system more complex. To reduce the complexity and to increase efficiency, an MPPT based on improved SMC has been invest...

This paper presents a theoretical and experimental analysis of Maximum Power Point Tracking (MPPT) method for photovoltaic (PV) systems based on Genetic Algorithms (GAs). The proposed algorithm is based on Genetic Algorithms (GAs) and it can estimate the current (Imp) and voltage (Vmp) at maximum power point by measuring the open circuit voltage (V...

This paper proposes a new Perturb and Observe (P&O) Maximum Power Point Tracking (MPPT) algorithm for Small Wind Energy Conversion Systems to overcome the rapidity-efficiency trade-off and wrong behavior problems of the conventional P&O technique. The proposed algorithm works in two separate modes. The first mode is activated when the wind speed ch...

This paper proposes a modified perturbation and observation maximum power point tracking algorithm for small wind energy conversion systems to overcome the problems of the conventional perturbation and observation technique, namely rapidity/efficiency trade-off and the divergence from peak power under a fast variation of the wind speed. Two modes o...

A current reversible DC/DC double-boost quadratic converter, capable of performing high transformation ratios.

This paper concentrates on the modeling and control of an autonomous photovoltaic power electricity generation system. The system consists of a PV cell, a DC-DC Buck-boost converter used for Maximum Power Point Tracking (MPPT). As a consequence, the PV cell itself cannot maintain a constant DC voltage and function as a DC voltage power supply sourc...

In this paper, a linear state space model is realized for a three-phase shunt active power filter used to prevent the propagation of current harmonics into the power source. Different transformations are then applied to this model in order to include a parameter used to extract desired frequency components and achieve decoupling between phases. The...

This paper presents experimental analysis of Genetic Algorithms (GAs) based Maximum Power Point Tracking (MPPT) for photovoltaic (PV) systems. This method, presented by another paper [1], uses GAs to track the maximum power point (MPP) of PV panels. Comparison with the famous Perturb and Observe (P&O) and Incremental Conductance (Inc-Cond) are give...

Maximum power point tracking (MPPT) is a necessary function in all photovoltaic (PV) systems. The classic incremental conductance (IC) MPPT algorithm is widely used in the literature. However, when large changes occur in the irradiance, the performance of this algorithm is degraded. To eliminate all of the disadvantages of the classic IC algorithm,...

p>Cet article décrit un générateur photovoltaïque connecté au réseau électrique en associant les fonctionnalités d'un filtre actif parallèle de puissance afin d'améliorer la qualité de l'énergie. Le système proposé est constitué d'un champ de panneaux solaires, un onduleur de tension triphasé raccordé au réseau et une charge non linéaire constituée...

Maximum power point tracking (MPPT) is a necessary function for all photovoltaic (PV) systems. The classical incremental conductance (IncCond) maximum power point tracking (MPPT) with direct control is widely applied in many papers. The IncCond algorithm is prone to failure during high changes in the irradiance. This paper deals with a new algorith...

Tracking the Maximum Power Point (MPP) of the photovoltaic array is very difficult due to the non linearity of its I-V characteristic which is dependent to the temperature and irradiation conditions. In this paper we propose a new method called sliding mode control (SMC) to maximize the PV array output power. With this method, the PV array output p...

Tracking the Maximum Power Point (MPP) of the photovoltaic array is very difficult due to the non linearity of its I-V characteristic. In this paper we propose another method called sliding mode control (SMC) to optimize the efficiency of the system. A DC-DC Buck-boost converter which is able to operate in a wide range of output voltages and di...

The paper presents a performant algorithm to calculate and track the maximum power point (MPP) of Photovoltaic (PV) systems. The proposed algorithm is based on Genetic Algorithms (GAs) and it can estimate the current (Imp) and voltage (Vmp) at maximum power point by measuring the open circuit voltage (Voc) and the short circuit current (Isc) wi...

This paper considers a stand-alone power generation system, which is composed of a wind power generator, a PWM inverter and batteries. In order to ensure its power autonomy, a suitable controller has to be designed to manage the inverter, and then to make the generator work continually at its Maximum Power Point. Hence, an Euler-Lagrange modeling h...

This paper proposes a voltage control of a single distributed generation (DG) unit powered local load. The DG system utilizes three phase four wire voltage source inverter VSI with split DC link as the medium interface and LC filter. A dual loop scheme is employed. Hysteresis current controller is used in the inner loop. In the outer loop, a compou...

This paper deals with a new Maximum Power Point Tracking (MPPT) method for Photovoltaic (PV) systems based on Genetic Algorithms (GAs). The proposed algorithm can estimate the current (Impp) and voltage (Vmpp) at maximum power point by measuring the open circuit voltage (Voc) and the short circuit current (Isc) without knowing the irradiance and th...

This paper presents a new form of a non linear sliding surface with “optimal” parameters in order to have a suitable sliding mode controller for a DC-DC boost converter. A comparison between the proposed sliding surface (PSS) and the sliding surface proposed in [7] is done to test the effectiveness of the two forms.

Conventional direct power control (DPC) technique is a simple and efficient control strategy for three-phase PWM rectifier. However, its performance is deteriorated when the converter is supplied by unbalanced or distorted grid voltages. This paper presents the design and implementation of a new DPC scheme based on disturbance rejection principle t...

This paper deals with a new concept and analysis of direct power control (DPC) switching table for a three phase shunt active power filter (SAPF) to improve power quality. The active power reference is obtained from the VSI dc-bus voltage controlled at the required level using an integrator proportional corrector. Compared to their references, acti...

This paper presents a modelling of power factor correction and digital implementation of different loops of circuit such as the PI controller for voltage loop and the hysteresis controllers for current loop. Three hysteresis control techniques: fixed band, sinusoidal band and variable band are applied and have been verified by simulation. For the e...

This paper propose a voltage control of a single distributed generation (DG) unit powered local load. The DG system utilizes three phase four wire voltage source inverter VSI with split DC link as the medium interface and LC filter to attenuate the switching frequency harmonics, A dual loop scheme is employed. Dead beat current controller in inner...

This article presents the design and the implementation of dSPACE DS1104 controller board-based PI and fuzzy logic peak current-mode controllers in the voltage loop and two controllers in the current loop based first on a standard fixed hysteresis band control, followed by a variable hysteresis band control to achieve constant switching frequency f...

Hybridization of several types of renewable energy sources is an interesting alternative to ensure autonomy in a stand-alone system, since it compensates intermittent production of each one. Besides, power production has to be maximized, with the best economical control strategy. So, in this paper, a control strategy based on Euler-Lagrange modelin...

This paper deals with a shunt hybrid active power filter (SHAPF) based on a advanced control algorithm consisting of synchronous reference frame (SRF) rotating at fundamental angular speed using a Multi-Variable Filters (MFV) based robust PLL to determine the reference current for the SHAPF in order to improve the power quality and compensate react...

This paper deals with the concept and analysis of direct power control (DPC) for a three phase shunt active power filter (SAPF). From the topology of the SAPF and its equivalent scheme a new predefined switching table is designed by analyzing the voltage source inverter (VSI) switching vectors effect on the total derivatives of instantaneous and re...