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Dr. Oswaldo LOPEZ SANTOS
Universidad de Ibagué, Ibagué, Colombia

Basic Info


Research Keywords & Expertise

0 Renewable Energy
0 automation and control engineering
0 Control and Modelling of Power Converters
0 Power electronics converters, Topologies and control
0 Microgrids control

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Power electronics converters, Topologies and control
Renewable Energy

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Short Biography

Oswaldo Lopez-Santos received his electronics engineering degree from the Universidad Distrital Francisco José de Caldas in Bogotá, Colombia in 2002, his Master's degree in industrial automation from the Universidad Nacional de Colombia, Bogotá, Colombia in 2011, and his Ph.D. degree from the Institute National des Sciencies Apliquées (INSA) de Toulouse in 2015, developing his research project at LAAS-CNRS. From 2004 to 2008, he worked in Colombia as a design engineer for the manufacture of industrial power converters. Currently, he is an Associate Professor with the Electronics Engineering Department and a researcher in the Group D+Tec at the Universidad de Ibagué, Colombia.

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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: 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: 08 February 2020 in Sensors
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Detection of an environmental contaminant requires the use of expensive measurement equipment, which limits the realization of in situ tests because of their high cost, their limited portability, or the extended time duration of the tests. This paper presents in detail the development of a portable low-cost spectrophotometer which, by using a specialized chemosensor, allows detection of mercuric ions (Hg2+), providing effective and accurate results. Design specifications for all the stages assembling the spectrophotometer and the elements selected to build them are presented along with the process to synthesize the chemosensor and the tests developed to validate its performance in comparison with a high-precision commercial laboratory spectrophotometer.

ACS Style

David González-Morales; Asmilly Valencia; Astrid Díaz-Nuñez; Marcial Fuentes-Estrada; Oswaldo López-Santos; Olimpo García-Beltrán. Development of a Low-Cost UV-Vis Spectrophotometer and Its Application for the Detection of Mercuric Ions Assisted by Chemosensors. Sensors 2020, 20, 906 .

AMA Style

David González-Morales, Asmilly Valencia, Astrid Díaz-Nuñez, Marcial Fuentes-Estrada, Oswaldo López-Santos, Olimpo García-Beltrán. Development of a Low-Cost UV-Vis Spectrophotometer and Its Application for the Detection of Mercuric Ions Assisted by Chemosensors. Sensors. 2020; 20 (3):906.

Chicago/Turabian Style

David González-Morales; Asmilly Valencia; Astrid Díaz-Nuñez; Marcial Fuentes-Estrada; Oswaldo López-Santos; Olimpo García-Beltrán. 2020. "Development of a Low-Cost UV-Vis Spectrophotometer and Its Application for the Detection of Mercuric Ions Assisted by Chemosensors." Sensors 20, no. 3: 906.

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.

Conference paper
Published: 22 September 2019 in Transactions on Petri Nets and Other Models of Concurrency XV
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Cascade transformer multilevel inverters (CT-MLI) are DC–AC converters used in medium and high power applications to provide standardized AC output. Despite their numerous advantages and robustness, these devices are highly susceptible to fault events because of their high amount of components. Therefore, early failure detection enables turning off the power system avoiding the propagation of the fault to the connected loads. Beyond that, converter operation can be reconfigured to tolerate the fault and activate a fail flag facilitating the subsequent corrective maintenance. The techniques proposed so far required several sensors, which is not practical. Therefore, in this study, we propose an automatic fault detection algorithm for cascade multilevel inverters based on pattern recognition, that only requires a sensor located at the output of the inverter. Naive Bayes, decision tree, nearest neighbor, and support vector machine were tested as classifiers using cross validation. The proposed method showed high detection accuracy when all the obtained descriptors were employed, being the K-NN the classifier showing superior performance. Furthermore, an evaluation was developed to determine the minimum number of descriptors required for the effective operation of the detection system, reducing the computational cost and simplifying its implementation. The method was validated by using simulation results obtained from a multilevel inverter circuit model.

ACS Style

Diego Salazar-D’Antonio; Nohora Meneses-Casas; Manuel G. Forero; Oswaldo López-Santos. Automatic Fault Detection in a Cascaded Transformer Multilevel Inverter Using Pattern Recognition Techniques. Transactions on Petri Nets and Other Models of Concurrency XV 2019, 378 -385.

AMA Style

Diego Salazar-D’Antonio, Nohora Meneses-Casas, Manuel G. Forero, Oswaldo López-Santos. Automatic Fault Detection in a Cascaded Transformer Multilevel Inverter Using Pattern Recognition Techniques. Transactions on Petri Nets and Other Models of Concurrency XV. 2019; ():378-385.

Chicago/Turabian Style

Diego Salazar-D’Antonio; Nohora Meneses-Casas; Manuel G. Forero; Oswaldo López-Santos. 2019. "Automatic Fault Detection in a Cascaded Transformer Multilevel Inverter Using Pattern Recognition Techniques." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 378-385.

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: 22 July 2019 in IEEE Access
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This paper introduces a method to enforce balanced power distribution between the stages of a single-phase transformer-based cascaded multilevel inverter using the new asymmetric ratio 6:7:8:9 between stages. Since the inverter is fed by a single DC source, asymmetry is enforced by means of the transformer turns ratio providing multiple redundant switching patterns to synthesize an output signal of until 35 levels. As it is developed in the paper, optimum switching patterns for the proposed ratio allow reducing typical power unbalance produced by commonly used ratios in four stage multilevel inverters (1:2:4:8 and 1:3:9:27). The proposed method consists on determining off-line the best switching patterns for minimizing deviation error, and then, storing them as lock-up tables in the digital device controlling the inverter. By permanently reproducing the selected switching patterns, balanced power distribution is achieved. A closed-loop control approach to regulate the RMS value of the output voltage compatible with the proposed method is also developed. The experimental results using a laboratory prototype are presented validating the entire approach.

ACS Style

Oswaldo Lopez-Santos; Carlos A. Jacanamejoy-Jamioy; Diego F. Salazar-D'Antonio; Julian R. Corredor-Ramirez; Germain Garcia; Luis Martinez-Salamero. A Single-Phase Transformer-Based Cascaded Asymmetric Multilevel Inverter With Balanced Power Distribution. IEEE Access 2019, 7, 98182 -98196.

AMA Style

Oswaldo Lopez-Santos, Carlos A. Jacanamejoy-Jamioy, Diego F. Salazar-D'Antonio, Julian R. Corredor-Ramirez, Germain Garcia, Luis Martinez-Salamero. A Single-Phase Transformer-Based Cascaded Asymmetric Multilevel Inverter With Balanced Power Distribution. IEEE Access. 2019; 7 ():98182-98196.

Chicago/Turabian Style

Oswaldo Lopez-Santos; Carlos A. Jacanamejoy-Jamioy; Diego F. Salazar-D'Antonio; Julian R. Corredor-Ramirez; Germain Garcia; Luis Martinez-Salamero. 2019. "A Single-Phase Transformer-Based Cascaded Asymmetric Multilevel Inverter With Balanced Power Distribution." IEEE Access 7, no. : 98182-98196.

Proceedings article
Published: 01 May 2019 in 2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)
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This paper presents a real-time emulation tool developed to integrate a small-scale wind turbine as distributed generator into a hybrid microgrid laboratory testbed. The wind dynamic is simulated by controlling an induction motor from a LabVIEW application to change the rotor speed of the turbine depending of a specified operation scenario defined by the user. Static behavior of the complete system was characterized by means of a black-box identification method using experimental data allowing also development of an accurate and simple model for simulation. Practical results show the high potentiality of the developed system in the study of microgrids.

ACS Style

Jhonathan Julian Gallego Rojas; David Alejandro Zambrano Prada; Oswaldo Lopez Santos. Real-Time Small-Scale Wind Turbine Emulator for a Hybrid Microgrid Laboratory Testbed. 2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA) 2019, 1 -6.

AMA Style

Jhonathan Julian Gallego Rojas, David Alejandro Zambrano Prada, Oswaldo Lopez Santos. Real-Time Small-Scale Wind Turbine Emulator for a Hybrid Microgrid Laboratory Testbed. 2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA). 2019; ():1-6.

Chicago/Turabian Style

Jhonathan Julian Gallego Rojas; David Alejandro Zambrano Prada; Oswaldo Lopez Santos. 2019. "Real-Time Small-Scale Wind Turbine Emulator for a Hybrid Microgrid Laboratory Testbed." 2019 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA) , no. : 1-6.

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.

Conference paper
Published: 01 October 2018 in 2018 IEEE Sensors Applications Symposium (SAS)
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This paper presents the design and implementation of a low-cost spectrophotometer (LCSPM) for in-situ detection of mercury in water. The proposed device is composed of a white light emitting diode (LED), a diffraction grating (DG), a rotational positioning system, two photodiodes and a low-cost microcontroller. High-resolution angle displacement of DG allows obtaining a selective projection of the visible spectrum on the studied water and the reference during the same test. All required algorithms are embedded into the microcontroller allowing the transfer of the resulting data to a computer. The capability of the proposed LCSPM for detection of mercuric ions (Hg 2 +) in water was tested with the help of a synthesized coumarin and then validated by comparison with a standard device.

ACS Style

David González-Morales; Oswaldo Lopez-Santos; Olimpo García-Beltrán. Low-Cost Spectrophotometer for In-Situ Detection of Mercury in Water. 2018 IEEE Sensors Applications Symposium (SAS) 2018, 1 -4.

AMA Style

David González-Morales, Oswaldo Lopez-Santos, Olimpo García-Beltrán. Low-Cost Spectrophotometer for In-Situ Detection of Mercury in Water. 2018 IEEE Sensors Applications Symposium (SAS). 2018; ():1-4.

Chicago/Turabian Style

David González-Morales; Oswaldo Lopez-Santos; Olimpo García-Beltrán. 2018. "Low-Cost Spectrophotometer for In-Situ Detection of Mercury in Water." 2018 IEEE Sensors Applications Symposium (SAS) , no. : 1-4.

Journal article
Published: 26 September 2018 in Energies
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A hold-up time extension circuit (HTEC) is used to charge and discharge an auxiliary capacitor. This capacitor stores the energy required to extend the operation time of critical loads experiencing short duration failures (SDF) at the DC bus to which they are connected. This paper presents complete modeling and a control-wise approach to a parallel HTEC based on the bidirectional buck-boost converter, which operates in Boundary Conduction Mode (BCM) with a variable switching frequency. The circuit permanently regulates the voltage of the auxiliary capacitor as well as the voltage of the DC bus during SDF, which is uncommon in industrial versions of HTEC. Enforcing the operation in BCM allows a reduction in the size of the inductor in the converter without requiring additional control circuitry. The entire behavior of the proposed HTEC, in all its operation modes, was analyzed theoretically and validated using simulation and experimental results, showing the potential of the circuit to be used in real applications.

ACS Style

Oswaldo Lopez-Santos; José Omar Urrego-Aponte; Sebastian Tilaguy Lezama; José David Almansa-López. Control of the Bidirectional Buck-Boost Converter Operating in Boundary Conduction Mode to Provide Hold-Up Time Extension. Energies 2018, 11, 2560 .

AMA Style

Oswaldo Lopez-Santos, José Omar Urrego-Aponte, Sebastian Tilaguy Lezama, José David Almansa-López. Control of the Bidirectional Buck-Boost Converter Operating in Boundary Conduction Mode to Provide Hold-Up Time Extension. Energies. 2018; 11 (10):2560.

Chicago/Turabian Style

Oswaldo Lopez-Santos; José Omar Urrego-Aponte; Sebastian Tilaguy Lezama; José David Almansa-López. 2018. "Control of the Bidirectional Buck-Boost Converter Operating in Boundary Conduction Mode to Provide Hold-Up Time Extension." Energies 11, no. 10: 2560.

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 Communications in Computer and Information Science
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This work describes in detail a computational tool designed to study performance indicators of a four-stage transformer-based single-phase cascaded multilevel inverter. The proposed system integrates simulation, on-line measurement, control and signal processing providing automating testing functionality to optimize the performance of the inverter with base on indicators such as Total Harmonic Distortion (THD), partial and global efficiency and power balance between the stages. The computational component of the tool was developed in LabVIEW providing not only didactic interactivity with the user through the Human-Machine Interface (HMI) but also a reliable interconnection with the power converter and the instruments of the experimental setup. The hardware component was developed integrating the power converter prototype, an acquisition card and electronic circuits providing measurement, conditioning, digital control and gate driving functions. Experimental results obtained from automatic tests are presented showing potentiality of the tool to support research activities related with this type of power converters.

ACS Style

Oswaldo Lopez-Santos; Julián R. Corredor; Diego F. Salazar. Computational Tool for Simulation and Automatic Testing of a Single-Phase Cascaded Multilevel Inverter. Communications in Computer and Information Science 2018, 509 -522.

AMA Style

Oswaldo Lopez-Santos, Julián R. Corredor, Diego F. Salazar. Computational Tool for Simulation and Automatic Testing of a Single-Phase Cascaded Multilevel Inverter. Communications in Computer and Information Science. 2018; ():509-522.

Chicago/Turabian Style

Oswaldo Lopez-Santos; Julián R. Corredor; Diego F. Salazar. 2018. "Computational Tool for Simulation and Automatic Testing of a Single-Phase Cascaded Multilevel Inverter." Communications in Computer and Information Science , no. : 509-522.

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.

Journal article
Published: 15 May 2018 in IEEE Transactions on Power Electronics
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This paper introduces a maximum power point tracking (MPPT) method based on a power (P) versus static conductance (G) curve of a photovoltaic (PV) array. The maximum power point (MPP) is tracked by comparing the PV array instantaneous power to a varying power reference generated by the MPPT algorithm. The comparison error is used to reduce or increase the conductance at which the PV array is forced to operate until the MPP is reached. Simultaneously, the error is used to change the power reference until the trajectory of this reference in the P-G curve enters a limit cycle around the MPP. The P-G curve is derived from a piecewise linear approximation of the current versus voltage (I-V) curve, which facilitates the analytical description of the tracking operation. The technique reported can also be implemented by means of simple analog or digital circuitry and requires two sensors to measure the instantaneous PV array current and voltage. It uses only four tuning parameters, which are selected depending on the maximum value of the derivative of the power with respect to the conductance. The theoretical predictions are verified with simulations and experimental results. The latter show that the procedure performs well enough to be favorably compared with the most efficient MPPT methods.

ACS Style

Oswaldo Lopez-Santos; Germain Garcia; Luis Martinez-Salamero; Roberto Giral; Enric Vidal-Idiarte; Maria Camila Merchan-Riveros; Yamel Moreno-Guzman. Analysis, Design, and Implementation of a Static Conductance-Based MPPT Method. IEEE Transactions on Power Electronics 2018, 34, 1960 -1979.

AMA Style

Oswaldo Lopez-Santos, Germain Garcia, Luis Martinez-Salamero, Roberto Giral, Enric Vidal-Idiarte, Maria Camila Merchan-Riveros, Yamel Moreno-Guzman. Analysis, Design, and Implementation of a Static Conductance-Based MPPT Method. IEEE Transactions on Power Electronics. 2018; 34 (2):1960-1979.

Chicago/Turabian Style

Oswaldo Lopez-Santos; Germain Garcia; Luis Martinez-Salamero; Roberto Giral; Enric Vidal-Idiarte; Maria Camila Merchan-Riveros; Yamel Moreno-Guzman. 2018. "Analysis, Design, and Implementation of a Static Conductance-Based MPPT Method." IEEE Transactions on Power Electronics 34, no. 2: 1960-1979.

Conference paper
Published: 29 August 2017 in Communications in Computer and Information Science
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This paper proposes a control method to provide the function of Solar Panel Emulation (SPE) to a low-cost programmable DC source. The proposed control operates with base on the error between measurement of the conductance connected at the output of the SPE and the conductance obtained evaluating the I-V characteristic of the panel model. The principle of operation is that the output of the controller modifies the value of the voltage introduced into the W-Lambert function to obtain the corresponding current enforcing the regulation of the measured conductance. In this paper, a controller composed by a nonlinear static gain and a conventional PI controller is proposed. The controller architecture configures a Wiener system structure which ensures the stable convergence of the real SPE variables to the values defined by the model. Simulation results are presented evaluating the dynamic performance of the system for irradiance and load variations. SPE method is implemented using simple measurement and conditioning circuits interacting with an application developed in LabVIEW through a data acquisition card. This implementation provides a complete solution highly applicable in research and industrial development.

ACS Style

Oswaldo López-Santos; María C. Merchán Riveros; María C. Salas Castaño; William A. Londoño; Germain Garcia. Emulation of a Photovoltaic Module Using a Wiener-Type Nonlinear Impedance Controller for Tracking of the Operation Point. Communications in Computer and Information Science 2017, 742, 482 -494.

AMA Style

Oswaldo López-Santos, María C. Merchán Riveros, María C. Salas Castaño, William A. Londoño, Germain Garcia. Emulation of a Photovoltaic Module Using a Wiener-Type Nonlinear Impedance Controller for Tracking of the Operation Point. Communications in Computer and Information Science. 2017; 742 ():482-494.

Chicago/Turabian Style

Oswaldo López-Santos; María C. Merchán Riveros; María C. Salas Castaño; William A. Londoño; Germain Garcia. 2017. "Emulation of a Photovoltaic Module Using a Wiener-Type Nonlinear Impedance Controller for Tracking of the Operation Point." Communications in Computer and Information Science 742, no. : 482-494.

Conference paper
Published: 29 August 2017 in Communications in Computer and Information Science
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This paper presents a proposal to charge and discharge valve-regulated lead-acid (VRLA) battery arrays integrated into microgrids by using the bidirectional Cûk converter with a multi-mode multi-loop control scheme based on sliding-mode control. The proposed control integrates the constant current - constant voltage - constant voltage charge method (CC-CV-CV) which is implemented using an inner current loop based on the sliding mode control of the input current of the converter and two nested outer loops based on the voltage and current of the battery. Conversely, the discharge is studied using two operational modes, one using a current reference given by a high level on a hierarchical structure and other using a current reference given by an outer Proportional-Integral (PI) controller regulating the voltage of the DC bus. The modelling of the bidirectional Cûk converter in these applications and its operational modes besides the analysis of the inner loop and the design criteria used in the synthesis of the outer loops are addressed. Simulation results are presented validating the control proposal.

ACS Style

Oswaldo Lopez-Santos; David A. Zambrano Prada; Yeison A. Aldana-Rodriguez; Harold A. Esquivel-Cabeza; Germain Garcia; Luis Martinez-Salamero. Control of a Bidirectional Cûk Converter Providing Charge/Discharge of a Battery Array Integrated in DC Buses of Microgrids. Communications in Computer and Information Science 2017, 495 -507.

AMA Style

Oswaldo Lopez-Santos, David A. Zambrano Prada, Yeison A. Aldana-Rodriguez, Harold A. Esquivel-Cabeza, Germain Garcia, Luis Martinez-Salamero. Control of a Bidirectional Cûk Converter Providing Charge/Discharge of a Battery Array Integrated in DC Buses of Microgrids. Communications in Computer and Information Science. 2017; ():495-507.

Chicago/Turabian Style

Oswaldo Lopez-Santos; David A. Zambrano Prada; Yeison A. Aldana-Rodriguez; Harold A. Esquivel-Cabeza; Germain Garcia; Luis Martinez-Salamero. 2017. "Control of a Bidirectional Cûk Converter Providing Charge/Discharge of a Battery Array Integrated in DC Buses of Microgrids." Communications in Computer and Information Science , no. : 495-507.