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Prof. Germain García
Department of Decision and Optimization (DO), Laboratoire d’Analyse et d’Architecture des Systèmes (LAAS), University of Toulouse, Av. Colonel Roche F-31400, Toulouse, France

Basic Info


Research Keywords & Expertise

0 Control Theory
0 Power Converters
0 Power Systems
0 Control systems
0 Nonlinear Control

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Power Converters
feedback control
Control systems
Nonlinear Control
Power Systems
controller design
Control Theory

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Short Biography

Germain Garcia received his diploma in engineering from the Institut National des Sciencies Apliquées (INSA), Toulouse, France, in 1984. He also received his Ph.D. degree in Automatic Control from the INSAT in 1988 and the Habilitation à Diriger des Recherches (HDR) in 1997 from the same university. He is currently working at the Laboratoire d’Architecture des Systèmes of the Centre National pour la Recherche Scientifique (LAAS-CNRS), Toulouse, France as full professor of INSAT. His research interests include robust control theory, linear matrix inequalities (LMI), constrained control and singularity perturbed models.

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Journal article
Published: 19 August 2021 in Applied Sciences
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This paper extends the results recently proposed in Part I of this research work focused on the stabilization of power electronic converters. This second part is devoted to cases in which the underlying control problems can be translated into tracking control problems. This is the case for DC-AC converters whose output must track a sinusoidal reference signal. The idea is to tackle the problem in a unified manner in order to avoid as much as possible the use of approximations and to exploit all the mathematical properties of the corresponding switched models. The case in which measurable or non-measurable perturbations are present is considered. The proposed techniques are illustrated for two particular DC-AC converters simulated using the PSIM software.

ACS Style

Germain Garcia; Oswaldo Lopez-Santos; Luis Martinez-Salamero. A Unified Approach for the Control of Power Electronics Converters. Part II: Tracking. Applied Sciences 2021, 11, 7618 .

AMA Style

Germain Garcia, Oswaldo Lopez-Santos, Luis Martinez-Salamero. A Unified Approach for the Control of Power Electronics Converters. Part II: Tracking. Applied Sciences. 2021; 11 (16):7618.

Chicago/Turabian Style

Germain Garcia; Oswaldo Lopez-Santos; Luis Martinez-Salamero. 2021. "A Unified Approach for the Control of Power Electronics Converters. Part II: Tracking." Applied Sciences 11, no. 16: 7618.

Editorial
Published: 18 May 2021 in Applied Sciences
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The use of power converters has grown in the last years with the advances in photovoltaic and wind based power generation systems, and the progress in modern concepts such as microgrids and electric mobility. A consequence has been the development of devices allowing for the exchange of energy among different distribution buses, and feeding AC or DC loads from low DC voltage levels, whose proper operation is achieved by means of specialized control systems. Simultaneously, the power converters used for conventional industrial applications have evolved thanks to the application of new control methods, and the combination of these with well-established techniques. This special issue contributes theoretical and practical advances to the state-of-the-art field at the crossroads of power electronics and control systems. The seven included papers cover particular applications requiring either DC–DC, DC–AC or AC–DC conversion stages.

ACS Style

Oswaldo Lopez-Santos; Germain Garcia. Special Issue “Advances in Control of Power Electronic Converters”. Applied Sciences 2021, 11, 4585 .

AMA Style

Oswaldo Lopez-Santos, Germain Garcia. Special Issue “Advances in Control of Power Electronic Converters”. Applied Sciences. 2021; 11 (10):4585.

Chicago/Turabian Style

Oswaldo Lopez-Santos; Germain Garcia. 2021. "Special Issue “Advances in Control of Power Electronic Converters”." Applied Sciences 11, no. 10: 4585.

Journal article
Published: 11 January 2021 in Applied Sciences
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This work deals with the control of power electronics converters. In that context, the majority of the problems of interest can be translated into two main problems: stabilization control problems and tracking control problems. Numerous methods exist in the literature to propose solutions which are based on several ways of handling them in a more appropriate context: linear, nonlinear, switching, and hybrid control, to cite the most important. In recent years, a considerable effort has been made to derive control design methods taking into account the specificities and properties of the complex behavior of these systems, going beyond the numerous techniques based on approximated models or focused on the specific converter topology under study and, in that way, making a step towards a desirable genericity level. It is the objective of this work to go a step further trying to tackle the control of power converters in a unified way. The idea is to avoid, as much as possible, the use of approximations and exploit all the mathematical properties of the associated switched models. Writing them in a specific way, it is possible to deal with a lot of problems of interest whose solutions are based on assumptions which are the expressions of some kind of practical feasibility, and then closely related to the existence of solutions to the studied problems. In some cases, the resulting controls have an inevitable complexity level which reflects one of the problems under study. For such situations, the implementation issues are important and are not discussed in details in this paper. The proposed methods are illustrated by numerical simulations conducted with the help of PSIM software. This research work is decomposed into two parts, the first one focused on stabilization problems is developed in this paper. The other one concerning the tracking problems will be developed in a future paper.

ACS Style

Germain Garcia; Oswaldo Lopez Santos. A Unified Approach for the Control of Power Electronics Converters. Part I—Stabilization and Regulation. Applied Sciences 2021, 11, 631 .

AMA Style

Germain Garcia, Oswaldo Lopez Santos. A Unified Approach for the Control of Power Electronics Converters. Part I—Stabilization and Regulation. Applied Sciences. 2021; 11 (2):631.

Chicago/Turabian Style

Germain Garcia; Oswaldo Lopez Santos. 2021. "A Unified Approach for the Control of Power Electronics Converters. Part I—Stabilization and Regulation." Applied Sciences 11, no. 2: 631.

Journal article
Published: 01 December 2020 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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Coupled-inductor buck-boost dc-dc switching converter has emerged as an alternative to manage power in several hybrid system architectures. This is due to features such as a noninverting voltage step up and step down characteristic, high efficiency, wide-bandwidth, and the possibility to regulate its input or output currents as has been reported in previous works. All of them are based on a small-signal linearized model around an operating point. In this paper, a model predictive control strategy is proposed in order to increase the operation point domain. The proposal consists in the use of the mathematical model of the system in discrete time to obtain the optimal switching state to be applied in the converter, based on a cost function optimization which simultaneously improves the current tracking and reduces the converter power losses. Experimental results validate the proposal demonstrating that this is a good alternative for the control of this kind of power converters.

ACS Style

Carlos Restrepo; Germain Garcia; Freddy Flores-Bahamonde; Duberney Murillo-Yarce; Johan I. Guzman; Marco Rivera. Current Control of the Coupled-Inductor Buck–Boost DC–DC Switching Converter Using a Model Predictive Control Approach. IEEE Journal of Emerging and Selected Topics in Power Electronics 2020, 8, 3348 -3360.

AMA Style

Carlos Restrepo, Germain Garcia, Freddy Flores-Bahamonde, Duberney Murillo-Yarce, Johan I. Guzman, Marco Rivera. Current Control of the Coupled-Inductor Buck–Boost DC–DC Switching Converter Using a Model Predictive Control Approach. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2020; 8 (4):3348-3360.

Chicago/Turabian Style

Carlos Restrepo; Germain Garcia; Freddy Flores-Bahamonde; Duberney Murillo-Yarce; Johan I. Guzman; Marco Rivera. 2020. "Current Control of the Coupled-Inductor Buck–Boost DC–DC Switching Converter Using a Model Predictive Control Approach." IEEE Journal of Emerging and Selected Topics in Power Electronics 8, no. 4: 3348-3360.

Journal article
Published: 22 October 2020 in IEEE Transactions on Circuits and Systems I: Regular Papers
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This paper presents a systematic approach to synthetize constant power loads using switching converters under sliding-mode control. The generation of sliding motions is analyzed in converters with a series inductor in the input port and a switching function representing the error between the input power and a suitable power reference. The analysis establishes the existence conditions for sliding-mode and the stability of the resulting ideal dynamics. Simulation and experimental results verifying the theoretical predictions in boost, Ćuk and SEPIC converters illustrate the proposal. The design procedure yields a simple, economical and small-size prototype that can be useful in the experimental validation of converters supplying constant power loads.

ACS Style

Blanca Areli Martinez-Trevino; Abdelali El Aroudi; Angel Cid-Pastor; Germain Garcia; Luis Martinez-Salamero. Synthesis of Constant Power Loads Using Switching Converters Under Sliding-Mode Control. IEEE Transactions on Circuits and Systems I: Regular Papers 2020, 68, 524 -535.

AMA Style

Blanca Areli Martinez-Trevino, Abdelali El Aroudi, Angel Cid-Pastor, Germain Garcia, Luis Martinez-Salamero. Synthesis of Constant Power Loads Using Switching Converters Under Sliding-Mode Control. IEEE Transactions on Circuits and Systems I: Regular Papers. 2020; 68 (1):524-535.

Chicago/Turabian Style

Blanca Areli Martinez-Trevino; Abdelali El Aroudi; Angel Cid-Pastor; Germain Garcia; Luis Martinez-Salamero. 2020. "Synthesis of Constant Power Loads Using Switching Converters Under Sliding-Mode Control." IEEE Transactions on Circuits and Systems I: Regular Papers 68, no. 1: 524-535.

Journal article
Published: 17 July 2020 in Applied Sciences
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Sliding-mode control (SMC) has been successfully applied to boost inverters, which solves the tracking problem of imposing sinusoidal behavior to the output voltage despite the coupled or decoupled operation of both boost cells in the converter. Most of the results reported in the literature were obtained using the conventional cascade-control structure involving outer loops that generate references for one or two sliding surfaces defined using linear combinations of inductor currents and capacitor voltages. As expected, all proposed methods share the inherent robustness and insensitivity to the uncertainties of SMC, which are the reasons why one of the few comparison criteria between them is the simplicity of their implementation that is evaluated according to the required measurements and mathematical operations. Furthermore, the slight differences between the obtained dynamic performances do not allow a clear distinction of the best solution. This study presents a new SMC approach applied to a boost inverter in which two boost cells are independently commutated. Each of these boost cells integrates an outer loop, enforcing the tracking of harmonic-enriched waveforms to the capacitor voltage. Although this approach increases by two the number of measurements and requires multiloop controllers, it allows effective alleviation of the semiconductor voltage stress by reducing the required voltage gain. A complete analytical study using harmonic balance technique allows deducing a simplified model allowing to obtain a PI controller valid into to the whole set of operation conditions. The several simulation results completely verified the potential of the control proposal and the accuracy of the employed methods.

ACS Style

Oswaldo López-Santos; Germain García. Double Sliding-Surface Multiloop Control Reducing Semiconductor Voltage Stress on the Boost Inverter. Applied Sciences 2020, 10, 4912 .

AMA Style

Oswaldo López-Santos, Germain García. Double Sliding-Surface Multiloop Control Reducing Semiconductor Voltage Stress on the Boost Inverter. Applied Sciences. 2020; 10 (14):4912.

Chicago/Turabian Style

Oswaldo López-Santos; Germain García. 2020. "Double Sliding-Surface Multiloop Control Reducing Semiconductor Voltage Stress on the Boost Inverter." Applied Sciences 10, no. 14: 4912.

Journal article
Published: 01 January 2020 in IFAC-PapersOnLine
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This paper deals with the maintenance phase control of general anesthesia during surgery, involving saturated input and noisy output. The objective is to maintain the patient to some given depth of hypnosis, measured by the BIS. The control law is an observer-based control, where a dead-zone observer is built in order to mitigate the presence of the output noise. The global exponential stability of the complete closed-loop system in the noise-free case is guaranteed thanks to a linear matrix inequality condition and an input-to-state property in presence of the noise is also proven. A three-steps optimization algorithm is proposed to determine the parameters of the control law and then evaluated on a patient case.

ACS Style

S. Tarbouriech; I. Queinnec; G. Garcia; M. Mazerolles. Dead-zone observer-based control for anesthesia subject to noisy BIS measurement. IFAC-PapersOnLine 2020, 53, 16191 -16196.

AMA Style

S. Tarbouriech, I. Queinnec, G. Garcia, M. Mazerolles. Dead-zone observer-based control for anesthesia subject to noisy BIS measurement. IFAC-PapersOnLine. 2020; 53 (2):16191-16196.

Chicago/Turabian Style

S. Tarbouriech; I. Queinnec; G. Garcia; M. Mazerolles. 2020. "Dead-zone observer-based control for anesthesia subject to noisy BIS measurement." IFAC-PapersOnLine 53, no. 2: 16191-16196.

Journal article
Published: 08 November 2019 in Electronics
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DC–DC interlinking converters (ILCs) allow bidirectional energy exchange between DC buses of different voltage levels in microgrids. This paper introduces a multimode control approach of a half-bridge DC–DC converter interlinking an extra-low-voltage DC (ELVDC) bus of 48 VDC and a low-voltage DC (LVDC) bus of 240 VDC within a hybrid microgrid. By using the proposed control, the converter can transfer power between the buses when the other converters regulate them, or it can ensure the voltage regulation of one of the buses, this originating from its three operation modes. The proposed control scheme is very simple and provides a uniform system response despite the dependence of the converter dynamic on the operating point and the selected mode. Simulation and experimental results validated the theoretical development and demonstrated the usefulness of the proposed scheme.

ACS Style

Oswaldo López-Santos; Yeison Alejandro Aldana-Rodríguez; Germain Garcia; Luis Martínez-Salamero. A Unified Multimode Control of a DC–DC Interlinking Converter Integrated into a Hybrid Microgrid. Electronics 2019, 8, 1314 .

AMA Style

Oswaldo López-Santos, Yeison Alejandro Aldana-Rodríguez, Germain Garcia, Luis Martínez-Salamero. A Unified Multimode Control of a DC–DC Interlinking Converter Integrated into a Hybrid Microgrid. Electronics. 2019; 8 (11):1314.

Chicago/Turabian Style

Oswaldo López-Santos; Yeison Alejandro Aldana-Rodríguez; Germain Garcia; Luis Martínez-Salamero. 2019. "A Unified Multimode Control of a DC–DC Interlinking Converter Integrated into a Hybrid Microgrid." Electronics 8, no. 11: 1314.

Journal article
Published: 07 September 2019 in Energies
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This paper deals with the analysis and design of a sliding mode-based controller to obtain high power factor (HPF) in the bridgeless isolated version of the single ended primary inductor converter (SEPIC) operating as a single-phase rectifier. In the work reported here, the converter is used as a unidirectional isolated interface between an AC source and a low voltage direct current (LVDC) distribution bus. The sliding-mode control is used to ensure the tracking of a high quality current reference at the input side, which is obtained from a sine waveform generator synchronized with the grid. The feasibility of the proposal is validated using simulation and experimental results, both of them confirming a reliable operation and showing good static and dynamic performances.

ACS Style

Oswaldo Lopez-Santos; Alejandro J. Cabeza-Cabeza; Germain Garcia; Luis Martinez-Salamero. Sliding Mode Control of the Isolated Bridgeless SEPIC High Power Factor Rectifier Interfacing an AC Source with a LVDC Distribution Bus. Energies 2019, 12, 3463 .

AMA Style

Oswaldo Lopez-Santos, Alejandro J. Cabeza-Cabeza, Germain Garcia, Luis Martinez-Salamero. Sliding Mode Control of the Isolated Bridgeless SEPIC High Power Factor Rectifier Interfacing an AC Source with a LVDC Distribution Bus. Energies. 2019; 12 (18):3463.

Chicago/Turabian Style

Oswaldo Lopez-Santos; Alejandro J. Cabeza-Cabeza; Germain Garcia; Luis Martinez-Salamero. 2019. "Sliding Mode Control of the Isolated Bridgeless SEPIC High Power Factor Rectifier Interfacing an AC Source with a LVDC Distribution Bus." Energies 12, no. 18: 3463.

Journal article
Published: 09 April 2019 in IEEE Transactions on Industrial Electronics
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This paper presents the analysis and design of a min-type strategy to control a synchronous boost converter in continuous conduction mode. The strategy uses a nonlinear switching surface to establish the change of topology in the converter and is analyzed by means of a sliding-mode control approach. Subsequently, the min-type strategy is modified by a hybrid control formulation, which introduces a hysteresis width and a dwell-time to obtain a finite switching frequency in the start-up and steady-state respectively. The hybrid control formulation is implemented digitally by means of a microprocessor which processes the samples of inductor current and capacitor voltage to provide the control signal that activates the power switch. Experimental results in a prototype validate the proposed control strategy and show its potential in transient time and steady-state.

ACS Style

Antonino Sferlazza; Carolina Albea-Sanchez; Luis Martinez-Salamero; Germain Garcia; Corinne Alonso. Min-Type Control Strategy of a DC–DC Synchronous Boost Converter. IEEE Transactions on Industrial Electronics 2019, 67, 3167 -3179.

AMA Style

Antonino Sferlazza, Carolina Albea-Sanchez, Luis Martinez-Salamero, Germain Garcia, Corinne Alonso. Min-Type Control Strategy of a DC–DC Synchronous Boost Converter. IEEE Transactions on Industrial Electronics. 2019; 67 (4):3167-3179.

Chicago/Turabian Style

Antonino Sferlazza; Carolina Albea-Sanchez; Luis Martinez-Salamero; Germain Garcia; Corinne Alonso. 2019. "Min-Type Control Strategy of a DC–DC Synchronous Boost Converter." IEEE Transactions on Industrial Electronics 67, no. 4: 3167-3179.

Journal article
Published: 01 April 2019 in IEEE Transactions on Automatic Control
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Using a hybrid systems approach, we address the practical stabilization of operating points for switched affine systems, ensuring a minimum dwell time and an admissible chattering around the operating point. Two different solutions are shown to induce uni-form dwell time, based on time- or space-regularization. The proposed solutions provide useful tuning knobs to separately adjust the switching frequency during transients and at the steady state. The strengths of the method are illustrated by simulating a boost converter.

ACS Style

Carolina Albea Sanchez; Germain Garcia; Sabrina Hadjeras; W. P. M. H. Heemels; Luca Zaccarian. Practical Stabilization of Switched Affine Systems With Dwell-Time Guarantees. IEEE Transactions on Automatic Control 2019, 64, 4811 -4817.

AMA Style

Carolina Albea Sanchez, Germain Garcia, Sabrina Hadjeras, W. P. M. H. Heemels, Luca Zaccarian. Practical Stabilization of Switched Affine Systems With Dwell-Time Guarantees. IEEE Transactions on Automatic Control. 2019; 64 (11):4811-4817.

Chicago/Turabian Style

Carolina Albea Sanchez; Germain Garcia; Sabrina Hadjeras; W. P. M. H. Heemels; Luca Zaccarian. 2019. "Practical Stabilization of Switched Affine Systems With Dwell-Time Guarantees." IEEE Transactions on Automatic Control 64, no. 11: 4811-4817.

Journal article
Published: 01 April 2019 in IET Control Theory & Applications
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Mimicking the medical practice, this study deals with the control of hypnosis during a surgical intervention thanks to a switched control strategy. The key idea consists in starting with an initial minimum time control for the induction phase followed by a dynamic output feedback for the maintenance phase. The objective during the first phase is to bring the patient from its awake state to a final state corresponding to some given depth of hypnosis, measured by the BIS (Bispectral index), within a minimum time. Then, once the patient state is close to the desired target, the control is switched to a dynamic output feedback ensuring that the BIS stays in a given interval taking into account the saturation of the actuator and the multi-time scale dynamics in the anaesthesia model. The positivity of the system is also preserved thanks to the use of input saturation and state constraints. The stability of the switched control strategy is addressed and the theoretical conditions are evaluated on different case studies.

ACS Style

Isabelle Queinnec; Sophie Tarbouriech; Saïd Zabi; Germain Garcia; Michel Mazerolles. Switched control strategy including time optimal control and robust dynamic output feedback for anaesthesia. IET Control Theory & Applications 2019, 13, 960 -969.

AMA Style

Isabelle Queinnec, Sophie Tarbouriech, Saïd Zabi, Germain Garcia, Michel Mazerolles. Switched control strategy including time optimal control and robust dynamic output feedback for anaesthesia. IET Control Theory & Applications. 2019; 13 (7):960-969.

Chicago/Turabian Style

Isabelle Queinnec; Sophie Tarbouriech; Saïd Zabi; Germain Garcia; Michel Mazerolles. 2019. "Switched control strategy including time optimal control and robust dynamic output feedback for anaesthesia." IET Control Theory & Applications 13, no. 7: 960-969.

Preprint
Published: 22 February 2019
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In this work, we propose a hybrid adap-tive control law for the half-bridge inverter subjected to the common problem of unknown load. This controller ensures the system robustness with respect to the output, taking into account the real nature of the signals, which means the continuous-time variables, (voltage and current signals) and the discrete-time variables, (switching signals). The adaptation is accomplished using a state observer and assuming that all states are measurable. Then, stability properties can be ensured using hybrid dynamical system theory and singular perturbation analysis. Finally, the proposed hybrid adaptive controller is validated in simulation. Index Terms-Half-bridge inverter, hybrid dynam-ical system, adaptive control, singular perturbation analysis.

ACS Style

Sabrina Hadjeras; J Agbodjan; Carolina Albea Sanchez; Germain Garcia. Hybrid adaptive control for the half-bridge inverter. 2019, 1 .

AMA Style

Sabrina Hadjeras, J Agbodjan, Carolina Albea Sanchez, Germain Garcia. Hybrid adaptive control for the half-bridge inverter. . 2019; ():1.

Chicago/Turabian Style

Sabrina Hadjeras; J Agbodjan; Carolina Albea Sanchez; Germain Garcia. 2019. "Hybrid adaptive control for the half-bridge inverter." , no. : 1.

Journal article
Published: 25 January 2019 in ISA Transactions
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This paper is concerned with the control problem for different types of one-sided Lipschitz (OSL) nonlinear systems subject to input nonlinearities, unmatched polytopic uncertainties and external perturbations. The design framework gathers the high robustness qualities of the sliding mode control (SMC) and the H∞ technique. The aims is to consider the bounded L2 disturbance attenuation measure in the analysis of sliding mode dynamics, thus to ameliorate the performance of the SMC system. An integral switching surface function is chosen and related synthesis conditions for the sliding mode dynamics are formulated in terms of linear matrix inequalities (LMIs). Then, an appropriate control law is synthesized such that reachability of the switching manifold is ensured. At last, simulation examples are provided to prove the feasibility of the proposed approach.

ACS Style

Wajdi Saad; Anis Sellami; Germain Garcia. H∞-Sliding mode control of one-sided Lipschitz nonlinear systems subject to input nonlinearities and polytopic uncertainties. ISA Transactions 2019, 90, 19 -29.

AMA Style

Wajdi Saad, Anis Sellami, Germain Garcia. H∞-Sliding mode control of one-sided Lipschitz nonlinear systems subject to input nonlinearities and polytopic uncertainties. ISA Transactions. 2019; 90 ():19-29.

Chicago/Turabian Style

Wajdi Saad; Anis Sellami; Germain Garcia. 2019. "H∞-Sliding mode control of one-sided Lipschitz nonlinear systems subject to input nonlinearities and polytopic uncertainties." ISA Transactions 90, no. : 19-29.

Journal article
Published: 25 December 2018 in Energies
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In this paper, the nonlinear dynamics of a PV-fed high-voltage-gain single-switch quadratic boost converter loaded by a grid-interlinked DC-AC inverter is explored in its parameter space. The control of the input port of the converter is designed using a resistive control approach ensuring stability at the slow time-scale. However, time-domain simulations, performed on a full-order circuit-level switched model implemented in PSIM© software, show that at relatively high irradiance levels, the system may exhibit undesired subharmonic instabilities at the fast time-scale. A model of the system is derived, and a closed-form expression is used for locating the subharmonic instability boundary in terms of parameters of different nature. The theoretical results are in remarkable agreement with the numerical simulations and experimental measurements using a laboratory prototype. The modeling method proposed and the results obtained can help in guiding the design of power conditioning converters for solar PV systems, as well as other similar structures for energy conversion systems.

ACS Style

Abdelali El Aroudi; Mohamed Al-Numay; Germain Garcia; Khalifa Al Hossani; Naji Al Sayari; Angel Cid-Pastor. Analysis of Nonlinear Dynamics of a Quadratic Boost Converter Used for Maximum Power Point Tracking in a Grid-Interlinked PV System. Energies 2018, 12, 61 .

AMA Style

Abdelali El Aroudi, Mohamed Al-Numay, Germain Garcia, Khalifa Al Hossani, Naji Al Sayari, Angel Cid-Pastor. Analysis of Nonlinear Dynamics of a Quadratic Boost Converter Used for Maximum Power Point Tracking in a Grid-Interlinked PV System. Energies. 2018; 12 (1):61.

Chicago/Turabian Style

Abdelali El Aroudi; Mohamed Al-Numay; Germain Garcia; Khalifa Al Hossani; Naji Al Sayari; Angel Cid-Pastor. 2018. "Analysis of Nonlinear Dynamics of a Quadratic Boost Converter Used for Maximum Power Point Tracking in a Grid-Interlinked PV System." Energies 12, no. 1: 61.

Journal article
Published: 05 October 2018 in IEEE Transactions on Control Systems Technology
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This brief presents a control law based on a hybrid dynamical systems theory for a dc-ac converter. This theory is very suited for an analysis of power electronic converters, since it combines continuous (voltages and currents) and discrete (on-off state of switches) signals avoiding, in this way, the use of averaged models. Here, practical stability results are induced for this tracking problem, ensuring a minimum dwell time associated with an Linear–Quadratic Regulator (LQR) performance level during the transient response and an admissible chattering around the operating point. The effectiveness of the resultant control law is validated by means of experiments.

ACS Style

Carolina Albea Sanchez; Oswaldo Lopez Santos; David Alejandro Zambrano Prada; Francisco Gordillo; Germain Garcia. On the Practical Stability of Hybrid Control Algorithm With Minimum Dwell Time for a DC–AC Converter. IEEE Transactions on Control Systems Technology 2018, 27, 2581 -2588.

AMA Style

Carolina Albea Sanchez, Oswaldo Lopez Santos, David Alejandro Zambrano Prada, Francisco Gordillo, Germain Garcia. On the Practical Stability of Hybrid Control Algorithm With Minimum Dwell Time for a DC–AC Converter. IEEE Transactions on Control Systems Technology. 2018; 27 (6):2581-2588.

Chicago/Turabian Style

Carolina Albea Sanchez; Oswaldo Lopez Santos; David Alejandro Zambrano Prada; Francisco Gordillo; Germain Garcia. 2018. "On the Practical Stability of Hybrid Control Algorithm With Minimum Dwell Time for a DC–AC Converter." IEEE Transactions on Control Systems Technology 27, no. 6: 2581-2588.

Research article
Published: 28 September 2018 in IET Control Theory & Applications
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This study is concerned with the problem of -integral sliding mode control (SMC) for one-sided Lipschitz (OSL) non-linear systems. Unmatched norm-bounded uncertainties and disturbances are considered. The design procedure gathers the high robustness qualities of the SMC and the measure performance. Initially, the solvability condition for the integral sliding surface is established and new sufficient linear matrix inequality (LMI) condition is derived such that the sliding mode dynamics is robust exponentially stable and has a disturbance attenuation performance. Then, an appropriate SMC law is synthesised to force the states of the system towards the sliding surface in finite time and to maintain a sliding motion on it thereafter. At last, two simulation examples are provided to prove the feasibility of the proposed method.

ACS Style

Wajdi Saad; Anis Sellami; Germain Garcia. Robust integral sliding mode‐ control of one‐sided Lipschitz non‐linear systems. IET Control Theory & Applications 2018, 12, 2357 -2367.

AMA Style

Wajdi Saad, Anis Sellami, Germain Garcia. Robust integral sliding mode‐ control of one‐sided Lipschitz non‐linear systems. IET Control Theory & Applications. 2018; 12 (17):2357-2367.

Chicago/Turabian Style

Wajdi Saad; Anis Sellami; Germain Garcia. 2018. "Robust integral sliding mode‐ control of one‐sided Lipschitz non‐linear systems." IET Control Theory & Applications 12, no. 17: 2357-2367.

Preprint
Published: 17 September 2018
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ACS Style

Carolina Albea Sanchez; Oswaldo Lopez Santos; David A. Zambrano Prada; Francisco Gordillo; Germain Garcia. On the practical stability of hybrid control algorithm with minimum dwell-time for a DC-AC converter. 2018, 1 .

AMA Style

Carolina Albea Sanchez, Oswaldo Lopez Santos, David A. Zambrano Prada, Francisco Gordillo, Germain Garcia. On the practical stability of hybrid control algorithm with minimum dwell-time for a DC-AC converter. . 2018; ():1.

Chicago/Turabian Style

Carolina Albea Sanchez; Oswaldo Lopez Santos; David A. Zambrano Prada; Francisco Gordillo; Germain Garcia. 2018. "On the practical stability of hybrid control algorithm with minimum dwell-time for a DC-AC converter." , no. : 1.

Conference paper
Published: 13 September 2018 in Programmieren für Ingenieure und Naturwissenschaftler
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This paper introduces a simplified method for digital generation of high-quality references required for control of single-phase grid-connected (GC) power converters, which can generate synchronized sinusoidal waveforms at the same frequency of the input signal or its harmonics. Therefore, its application can be useful for active power filtering, high power factor rectification, and grid integration of renewable energy sources. A hybrid analog-digital implementation is proposed integrating an Adaptive Sampling Frequency Moving Average Filter (ASF-MAF) and a discrete-time Proportional-Integral (PI) controller into a Digital Signal Processor (DSP) operating with a sampling frequency defined by an external hardware-based Voltage Controlled Oscillator (VCO). The main advantages attributed to the method are immunity to harmonic content, accuracy in computations despite of frequency changes, flexibility to produce phase displacements and reduced computational cost. Performance of the proposal was verified by means of simulation and experimental results.

ACS Style

Oswaldo Lopez-Santos; Sebastian Tilaguy Lezama; Germain Garcia. Adaptive Sampling Frequency Synchronized Reference Generator for Grid Connected Power Converters. Programmieren für Ingenieure und Naturwissenschaftler 2018, 573 -587.

AMA Style

Oswaldo Lopez-Santos, Sebastian Tilaguy Lezama, Germain Garcia. Adaptive Sampling Frequency Synchronized Reference Generator for Grid Connected Power Converters. Programmieren für Ingenieure und Naturwissenschaftler. 2018; ():573-587.

Chicago/Turabian Style

Oswaldo Lopez-Santos; Sebastian Tilaguy Lezama; Germain Garcia. 2018. "Adaptive Sampling Frequency Synchronized Reference Generator for Grid Connected Power Converters." Programmieren für Ingenieure und Naturwissenschaftler , no. : 573-587.

Conference paper
Published: 13 September 2018 in Communications in Computer and Information Science
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This paper presents an event-triggered approach to optimally implement a Maximum Power Point Tracking (MPPT) algorithm into a Digital Signal Processor (DSP). The proposed method allows improving the amount and distribution of time required for executing control tasks. The used nested loop control architecture has an outer loop of MPPT generating the conductance reference used by an inner loop which regulates the input conductance of a DC-DC converter. This last loop enforces a sliding-mode loss-free-resistor behavior for the power converter by means of a simple hysteresis comparator. Computations required by the MPPT algorithm are synchronously executed by the two possible commutation events produced by the inner loop during a switching period. Then, the acquisition of signals must be activated only at an instant before each one of the switching events, releasing the most of the time to implement other tasks. This last characteristic and the use of a nested loop control architecture facilitate the integration of the other essential control functions for photovoltaic (PV) generators in microgrids. Simulation and experimental results confirm the high potetialities of this implementation approach.

ACS Style

Oswaldo Lopez-Santos; María Merchán-Riveros; Germain Garcia. Event-Triggered Digital Implementation of MPPT for Integration of PV Generators in DC Buses of Microgrids. Communications in Computer and Information Science 2018, 548 -560.

AMA Style

Oswaldo Lopez-Santos, María Merchán-Riveros, Germain Garcia. Event-Triggered Digital Implementation of MPPT for Integration of PV Generators in DC Buses of Microgrids. Communications in Computer and Information Science. 2018; ():548-560.

Chicago/Turabian Style

Oswaldo Lopez-Santos; María Merchán-Riveros; Germain Garcia. 2018. "Event-Triggered Digital Implementation of MPPT for Integration of PV Generators in DC Buses of Microgrids." Communications in Computer and Information Science , no. : 548-560.