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In photovoltaic (PV) generation systems, the energy produced is limited by the low efficiency of the solar panels, the variability of weather conditions, and the characteristics of the load connected, so the use of maximum power point tracking (MPPT) methods is essential to maximize the power supplied. Implementing an MPPT requires a power converter as the interface between the PV array and the load, so the converter's behavior is also an important factor to be considered in the overall performance of a PV system. Several MPPT techniques have been proposed over the years, but little literature is still available when required to be compared to the combined performance of different MPPT/converter sets. In this context, the present work presents a comparative study of the performance of three MPPT techniques: constant voltage (CV), perturb and observe (P&O), and incremental conductance (IncCond), acting on two different topologies of DC-DC power converters: Buck and Buck-Boost. Each combination is analyzed considering its transient response and steady-state average efficiency. The study was carried out based on simulations in Matlab/Simulink environment. To obtain more realistic conditions, a model for the commercial PV module Kyocera KC85TS was developed. Results obtained from the PV system operating under various radiation and temperature conditions are compared and discussed, which show that the CV/Buck-Boost combination showed the best transient behavior and that the IncCond/Buck combination had the highest steady-state efficiency.
Julio López Seguel; S.I Seleme Jr; Lenin M.F Moráis. Comparison of the performance of MPPT methods applied in converters Buck and Buck-Boost for autonomous photovoltaic systems. Ingeniare. Revista chilena de ingeniería 2021, 29, 229 -244.
AMA StyleJulio López Seguel, S.I Seleme Jr, Lenin M.F Moráis. Comparison of the performance of MPPT methods applied in converters Buck and Buck-Boost for autonomous photovoltaic systems. Ingeniare. Revista chilena de ingeniería. 2021; 29 (2):229-244.
Chicago/Turabian StyleJulio López Seguel; S.I Seleme Jr; Lenin M.F Moráis. 2021. "Comparison of the performance of MPPT methods applied in converters Buck and Buck-Boost for autonomous photovoltaic systems." Ingeniare. Revista chilena de ingeniería 29, no. 2: 229-244.
In light of robustness and specific characteristics of the semiconductor switches and converters, nonlinear controllers perceive power electronics as an important application field. As there is still a gap between theory and practice because of the complexity of this theme for an initial contact, many students and industrial engineers are discouraged. Generally and intuitively, the aim of this paper is to present some practical considerations such as: simple procedure to obtain nonlinear equations, sinusoidal, three-phase and isolated cases, indispensable techniques like load estimation and PI controller for output voltage regulation, Hardware in The Loop (HIL) Simulation and hybrid solutions. An additional goal is the comparative study of three nonlinear control methods - state feedback linearization (SFL), passivity based control (PBC) and interconnection and damping assignment passivity based control (IDA-PBC), all of which are applied to seven static power converters: buck, boost, buck-boost, flyback, 3-phase boost, CUK and SEPIC. Comparative figures and tables are constructed to evidence the similarities and differences between the techniques and converters. The results are shown from a qualitative viewpoint.
A.H.R. Rosa; L.M.F. Morais; G.O. Fortes; S.I. Seleme Júnior. Practical considerations of nonlinear control techniques applied to static power converters: A survey and comparative study. International Journal of Electrical Power & Energy Systems 2020, 127, 106545 .
AMA StyleA.H.R. Rosa, L.M.F. Morais, G.O. Fortes, S.I. Seleme Júnior. Practical considerations of nonlinear control techniques applied to static power converters: A survey and comparative study. International Journal of Electrical Power & Energy Systems. 2020; 127 ():106545.
Chicago/Turabian StyleA.H.R. Rosa; L.M.F. Morais; G.O. Fortes; S.I. Seleme Júnior. 2020. "Practical considerations of nonlinear control techniques applied to static power converters: A survey and comparative study." International Journal of Electrical Power & Energy Systems 127, no. : 106545.
Series and parallel multicell converters have been introduced because they provide benefits in term of efficiency and power density. However, they also allow reducing the amount of energy stored in the filters, which potentially allows for faster dynamic responses. Interleaving the control patterns of different cells is another distinctive feature of these converters and is also the root of another potential improvement of the dynamic response: with one PWM update at each subcycle of the switching period, a n-cell converter may change its average output voltage over each of these intervals, while standard converters can only control the voltage over half the switching period. In this paper, a general multirate modulation strategy taking advantage of this property, while avoiding overswitching, and compatible with any n-cell converter is proposed and validated by simulation and experimental results.
Tiago De Sa Ferreira; Guilherme Monteiro de Rezende; Lenin Martins Ferreira Morais; Victor Flores Mendes; Didier Flumian; Jeremi Regnier; Thierry A. Meynard. Novel Multirate Modulator for High-Bandwidth Multicell Converters. IEEE Transactions on Power Electronics 2020, 36, 4887 -4900.
AMA StyleTiago De Sa Ferreira, Guilherme Monteiro de Rezende, Lenin Martins Ferreira Morais, Victor Flores Mendes, Didier Flumian, Jeremi Regnier, Thierry A. Meynard. Novel Multirate Modulator for High-Bandwidth Multicell Converters. IEEE Transactions on Power Electronics. 2020; 36 (4):4887-4900.
Chicago/Turabian StyleTiago De Sa Ferreira; Guilherme Monteiro de Rezende; Lenin Martins Ferreira Morais; Victor Flores Mendes; Didier Flumian; Jeremi Regnier; Thierry A. Meynard. 2020. "Novel Multirate Modulator for High-Bandwidth Multicell Converters." IEEE Transactions on Power Electronics 36, no. 4: 4887-4900.
This work proposes an adaptive dc-link voltage strategy applied to a double-star chopper cell-based static synchronous compensator (DSCC-STATCOM). The proposed technique aims to improve the converter reliability by controlling the cell reference voltage according to the minimum voltage required in each STATCOM operation condition. It is important to remark that the proposed strategy does not require any hardware modification. The technique is evaluated in terms of dynamics and reliability. For this purpose, two modulation strategies were analyzed: phase-shifted pulse-width modulation (PS-PWM) and nearest-level control with cell tolerance band algorithm (NLC-CTB). The results show that the proposed technique can reduce the switching losses and increase the system reliability. For the evaluated case study, the DSCC-STATCOM B1 lifetime increases 16% and 23% for PS-PWM and NLC-CTB, respectively, when the minimum voltage control strategy is employed.
R.O. de Sousa; A.F. Cupertino; Lenin Morais; H.A. Pereira. Minimum voltage control for reliability improvement in modular multilevel cascade converters-based STATCOM. Microelectronics Reliability 2020, 110, 113693 .
AMA StyleR.O. de Sousa, A.F. Cupertino, Lenin Morais, H.A. Pereira. Minimum voltage control for reliability improvement in modular multilevel cascade converters-based STATCOM. Microelectronics Reliability. 2020; 110 ():113693.
Chicago/Turabian StyleR.O. de Sousa; A.F. Cupertino; Lenin Morais; H.A. Pereira. 2020. "Minimum voltage control for reliability improvement in modular multilevel cascade converters-based STATCOM." Microelectronics Reliability 110, no. : 113693.
This paper presents the influence of different pulse width modulation (PWM) methods on losses and thermal stresses in SiC power modules used in a three-phase inverter. The variation of PWM methods directly impacts instantaneous losses on these semiconductors, consequently resulting in junction temperature swing at the fundamental frequency of the converter’s output current. This thermal cycling can significantly reduce the lifetime of these components. In order to determine semiconductor losses, one needs to characterize SiC devices to calculate the instantaneous power. The characterization methodology of the devices, the calculation of instantaneous power and temperature of SiC dies, and the influence of the different PWM methods are presented. A 15-kVA inverter is built in order to obtain experimental results to confirm the characterization and loss calculation, and we show the best PWM methods to increase efficiency and reliability of the three-phase inverter for specific aircraft applications.
Bernardo Cougo; Lenin M. F. Morais; Gilles Segond; Raphael Riva; Hoan Tran Duc. Influence of PWM Methods on Semiconductor Losses and Thermal Cycling of 15-kVA Three-Phase SiC Inverter for Aircraft Applications. Electronics 2020, 9, 620 .
AMA StyleBernardo Cougo, Lenin M. F. Morais, Gilles Segond, Raphael Riva, Hoan Tran Duc. Influence of PWM Methods on Semiconductor Losses and Thermal Cycling of 15-kVA Three-Phase SiC Inverter for Aircraft Applications. Electronics. 2020; 9 (4):620.
Chicago/Turabian StyleBernardo Cougo; Lenin M. F. Morais; Gilles Segond; Raphael Riva; Hoan Tran Duc. 2020. "Influence of PWM Methods on Semiconductor Losses and Thermal Cycling of 15-kVA Three-Phase SiC Inverter for Aircraft Applications." Electronics 9, no. 4: 620.
The Modular Multilevel Converter (MMC) has proved to be an attractive technology in medium and high voltage Static Synchronous Compensator (STATCOM) applications. Nevertheless, once reactive power compensation profile is not constant over time, there are periods that a MMC-STATCOM works below its nominal capacity. In these periods, the converter can be used to perform ancillary services, such as Active Power Filtering. This paper analyzes the thermal stresses in the capacitors and semiconductor devices (i.e. IGBTs and diodes). The analyses take into account reactive compensation and harmonic current compensation of 5 th and 7 th harmonic components of a MMC based STATCOM. In addition, the limits of harmonic compensation for 5 th and 7 th harmonic orders are analytically derived. The results demonstrated lower thermal stresses during Active Power Filtering than the traditional STATCOM operation. Moreover, the 5 th harmonic compensation is the most stressed one among the cases studied in this work.
R.O. De Sousa; W.C.S. Amorim; Dayane Do Carmo Mendonça; A.F. Cupertino; Lenin Morais; H.A. Pereira. Thermal Stress Evaluation of a Multifunctional Modular Multilevel Converter – STATCOM Operating as Active Filter. 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) 2019, 1 -6.
AMA StyleR.O. De Sousa, W.C.S. Amorim, Dayane Do Carmo Mendonça, A.F. Cupertino, Lenin Morais, H.A. Pereira. Thermal Stress Evaluation of a Multifunctional Modular Multilevel Converter – STATCOM Operating as Active Filter. 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC). 2019; ():1-6.
Chicago/Turabian StyleR.O. De Sousa; W.C.S. Amorim; Dayane Do Carmo Mendonça; A.F. Cupertino; Lenin Morais; H.A. Pereira. 2019. "Thermal Stress Evaluation of a Multifunctional Modular Multilevel Converter – STATCOM Operating as Active Filter." 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) , no. : 1-6.
In this work, a methodology is presented that allows the automatization of the inductor design, estimating copper losses, considering skin and proximity effects and also core losses through improved generalized Steinmetz equation. The inductors designed with this methodology were tested in a Buck converter, comparing the calculation of losses with measurements through a calorimeter.
P. H. J. Vilkn; Lenin Morais; R. A. S. Santana; P. C. Cortizo; P. F. Seixas. Inductor Design Methodology for Power Electronics Applications. 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) 2019, 1 -6.
AMA StyleP. H. J. Vilkn, Lenin Morais, R. A. S. Santana, P. C. Cortizo, P. F. Seixas. Inductor Design Methodology for Power Electronics Applications. 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC). 2019; ():1-6.
Chicago/Turabian StyleP. H. J. Vilkn; Lenin Morais; R. A. S. Santana; P. C. Cortizo; P. F. Seixas. 2019. "Inductor Design Methodology for Power Electronics Applications." 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) , no. : 1-6.
With the constant increase of energy consumption in the world, the efficiency of systems and equipment is becoming more important. Uninterruptible Power Supply (UPS) is an equipment that provides safe and reliable supply for critical load systems, that is, systems where a supply interruption can lead to economical or even human losses. The Double Conversion UPS is the most complete UPS class in terms of load protection, regulation, performance, and reliability, however, it has lower efficiency and higher cost because of its high number of power converters. Silicon Carbide devices are emerging as an opportunity to construct power converters with higher efficiency and higher power density. The main purpose of this work is to design a three-phase AC-DC-AC converter using Silicon Carbide for Double Conversion UPS applications. The aim is to maximize efficiency and minimize volume and mass. The methodologies to size and choose the main hardware components are described in detail. Experimental results obtained with the prototype prove the high efficiency and high power density achievable with Silicon Carbide Metal Oxide Semiconductor Field Effect Transistor (MOSFETs).
Wendell C. Alves; Lenin M. F. Morais; Porfirio C. Cortizo. Design of an Highly Efficient AC-DC-AC Three-Phase Converter Using SiC for UPS Applications. Electronics 2018, 7, 425 .
AMA StyleWendell C. Alves, Lenin M. F. Morais, Porfirio C. Cortizo. Design of an Highly Efficient AC-DC-AC Three-Phase Converter Using SiC for UPS Applications. Electronics. 2018; 7 (12):425.
Chicago/Turabian StyleWendell C. Alves; Lenin M. F. Morais; Porfirio C. Cortizo. 2018. "Design of an Highly Efficient AC-DC-AC Three-Phase Converter Using SiC for UPS Applications." Electronics 7, no. 12: 425.
The major goal of this article is to present a very simple, intuitive and powerful tool: the D-transform between converters. This new methodology aims to find a control equation of any predefined control law from one converter to another power converter. The idea behind is to take maximum advantage of the robustness offered by the originator nonlinear control law. Although there is the possibility of more than one conversion, some candidates show excellent performance in terms of settling time, transient overshoot, rejection of disturbance and steady- state regulation. The stability proof is given individually for each generated equation. The validation of the new D-controllers is done through Hardware In the Loop (HIL) simulations. A very low overshoot under input and load perturbations is obtained for the buck-boost example.
A. H. R. Rosa; Lenin Morais; W. He; S. I. Seleme. New nonlinear control method applied for power converters, based on D-Transform. 2018 13th IEEE International Conference on Industry Applications (INDUSCON) 2018, 704 -710.
AMA StyleA. H. R. Rosa, Lenin Morais, W. He, S. I. Seleme. New nonlinear control method applied for power converters, based on D-Transform. 2018 13th IEEE International Conference on Industry Applications (INDUSCON). 2018; ():704-710.
Chicago/Turabian StyleA. H. R. Rosa; Lenin Morais; W. He; S. I. Seleme. 2018. "New nonlinear control method applied for power converters, based on D-Transform." 2018 13th IEEE International Conference on Industry Applications (INDUSCON) , no. : 704-710.
In this work, a new real-time Simulation method is designed for nonlinear control techniques applied to power converters. We propose two different implementations: in the first one (Single Hardware in The Loop: SHIL), both model and control laws are inserted in the same Digital Signal Processor (DSP), and in the second approach (Double Hardware in The Loop: DHIL), the equations are loaded in different embedded systems. With this methodology, linear and nonlinear control techniques can be designed and compared in a quick and cheap real-time realization of the proposed systems, ideal for both students and engineers who are interested in learning and validating converters performance. The methodology can be applied to buck, boost, buck-boost, flyback, SEPIC and 3-phase AC-DC boost converters showing that the new and high performance embedded systems can evaluate distinct nonlinear controllers. The approach is done using matlab-simulink over commodity Texas Instruments Digital Signal Processors (TI-DSPs). The main purpose is to demonstrate the feasibility of proposed real-time implementations without using expensive HIL systems such as Opal-RT and Typhoon-HL.
Arthur H. R. Rosa; Matheus B. E. Silva; Marcos F. C. Campos; Renato A. S. Santana; Welbert A. Rodrigues; Lenin M. F. Morais; Seleme I. Seleme Jr.. SHIL and DHIL Simulations of Nonlinear Control Methods Applied for Power Converters Using Embedded Systems. Electronics 2018, 7, 241 .
AMA StyleArthur H. R. Rosa, Matheus B. E. Silva, Marcos F. C. Campos, Renato A. S. Santana, Welbert A. Rodrigues, Lenin M. F. Morais, Seleme I. Seleme Jr.. SHIL and DHIL Simulations of Nonlinear Control Methods Applied for Power Converters Using Embedded Systems. Electronics. 2018; 7 (10):241.
Chicago/Turabian StyleArthur H. R. Rosa; Matheus B. E. Silva; Marcos F. C. Campos; Renato A. S. Santana; Welbert A. Rodrigues; Lenin M. F. Morais; Seleme I. Seleme Jr.. 2018. "SHIL and DHIL Simulations of Nonlinear Control Methods Applied for Power Converters Using Embedded Systems." Electronics 7, no. 10: 241.
In a world with growing concern for efficiency, power electronics associated to high level control techniques are more and more used in different fields of application. One of the most common applications are three-phase machines fed by three-phase inverters to tune precisely the power consumption. In recent years, multilevel inverters have become the best solution to address the problems of high voltage, high current or high efficiency. PWM modulation strategies play an important role in the design of such converters and one may choose adequate carriers and zero order signals in order to improve the design of an important component of the system. Some PWM methods found in the literature minimize some key elements of three-phase systems, however when multilevel converters are considered, little is found. The aim of the paper is to present a simple but powerful approach which allows us to determine optimal zero sequence signals (also called Common Mode Offset, CMO) corresponding to any desired objective for many different topologies. It will be shown that some widely accepted PWM methods as well as new optimal methods are found by this method. These PWM methods will be compared by means of simulation and some CMOs created using our approach are validated by experimental results.
Bernardo Cougo; Thierry Meynard; Guillaume Gateau; Lenin M. F. Morais. Zero Sequences Optimizing Different Criteria for Three-Phase Multilevel Inverters. 2018 IEEE Energy Conversion Congress and Exposition (ECCE) 2018, 7243 -7250.
AMA StyleBernardo Cougo, Thierry Meynard, Guillaume Gateau, Lenin M. F. Morais. Zero Sequences Optimizing Different Criteria for Three-Phase Multilevel Inverters. 2018 IEEE Energy Conversion Congress and Exposition (ECCE). 2018; ():7243-7250.
Chicago/Turabian StyleBernardo Cougo; Thierry Meynard; Guillaume Gateau; Lenin M. F. Morais. 2018. "Zero Sequences Optimizing Different Criteria for Three-Phase Multilevel Inverters." 2018 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 7243-7250.
Solid State Transformers (SST) are attracting considerable attention due to their great application potential in future smart grids. It is an essential technology capable of promoting the modernization of the electric power distribution system and it is considered a key element for interfacing future microgrid systems to medium voltage utility grids, allowing plug-and-play integration with multiple renewable energy sources, storage devices and DC power systems. Its main advantages in relation to conventional transformers are substantial reduction of volume and weight, fault isolation capability, voltage regulation, harmonic filtering, reactive power compensation and power factor correction. A three-stage modular cascaded topology has been considered as an adequate candidate for the SST implementation, consisting of multiple power modules with input series and output parallel connection. The modular structure presents many advantages, e.g., redundancy, flexibility, lower current harmonic content and voltage stress on the power switches, however component tolerances and mismatches between modules can lead to DC link voltage imbalance and unequal power sharing that can damage the solid state transformer. This paper proposes a decentralized strategy based on adaptive droop control capable of promoting voltage and power balance among modules of a modular cascaded SST, without relying on a communication network. The behavior of the proposed strategy is assessed through a MATLAB/Simulink simulation model of an 100 kVA SST and shows that power and voltage balance are attained through inner power distribution of the SST modules, being transparent to elements connected to the transformer input and output ports. Besides that, real-time simulation results are presented to validate the proposed control strategies. The performance of embedded algorithms is evaluated by the implementation of the SST in a real-time simulation hardware, using a Digital Signal Processor (DSP) and high level programming.
Welbert A. Rodrigues; Thiago R. Oliveira; Lenin M. F. Morais; Arthur H. R. Rosa. Voltage and Power Balance Strategy without Communication for a Modular Solid State Transformer Based on Adaptive Droop Control. Energies 2018, 11, 1802 .
AMA StyleWelbert A. Rodrigues, Thiago R. Oliveira, Lenin M. F. Morais, Arthur H. R. Rosa. Voltage and Power Balance Strategy without Communication for a Modular Solid State Transformer Based on Adaptive Droop Control. Energies. 2018; 11 (7):1802.
Chicago/Turabian StyleWelbert A. Rodrigues; Thiago R. Oliveira; Lenin M. F. Morais; Arthur H. R. Rosa. 2018. "Voltage and Power Balance Strategy without Communication for a Modular Solid State Transformer Based on Adaptive Droop Control." Energies 11, no. 7: 1802.
In this paper, we propose adaptive nonlinear controllers for the Single-Ended Primary Inductance Converter (SEPIC). We also consider four distinct situations: AC-DC, DC-DC, Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). A comparative analysis between classic linear and nonlinear approaches to regulate the control loop is made. Three adaptive nonlinear control laws are designed: Feedback Linearization Control (FLC), Passivity-Based Control (PBC) and Interconnection and Damping Assignment Passivity-Based Control (IDAPBC). In order to compare the performance of these control techniques, numerical simulations were made in Software and Hardware in the Loop (HIL) for nominal conditions and operation disturbances. We recommend adaptive controllers for the two different situations: Adaptive Passivity-Based Feedback Linearization Control (APBFLC) for the PFC (Power Factor Correction) AC-DC system and IDAPBC-BB (IDAPBC Based on Boost converter) for the regulator DC-DC system.
Arthur H. R. Rosa; Thiago M. De Souza; Lenin M. F. Morais; Jr. Seleme I. Seleme. Adaptive and Nonlinear Control Techniques Applied to SEPIC Converter in DC-DC, PFC, CCM and DCM Modes Using HIL Simulation. Energies 2018, 11, 602 .
AMA StyleArthur H. R. Rosa, Thiago M. De Souza, Lenin M. F. Morais, Jr. Seleme I. Seleme. Adaptive and Nonlinear Control Techniques Applied to SEPIC Converter in DC-DC, PFC, CCM and DCM Modes Using HIL Simulation. Energies. 2018; 11 (3):602.
Chicago/Turabian StyleArthur H. R. Rosa; Thiago M. De Souza; Lenin M. F. Morais; Jr. Seleme I. Seleme. 2018. "Adaptive and Nonlinear Control Techniques Applied to SEPIC Converter in DC-DC, PFC, CCM and DCM Modes Using HIL Simulation." Energies 11, no. 3: 602.
The power network of wind farms is characterized by weak grid, where voltages may be heavy distorted and asymmetrical challenging the inverters current controllers that must be impervious to such disturbances. Then, this paper proposes to evaluate the operation performance of a wind power system based on permanent magnet synchronous machine using a control scheme devised in abc-frame under non-ideal voltage conditions. Such system may also perform load current compensation aggregating more functionality and increasing its cost-benefit.
M. F. C. Campos; D. I. Brandao; V. F. Mendes; L. M. F. Morais; S. I. Seleme. Control of a PMSG based wind power system using abc-frame under distorted and asymmetrical voltage conditions. 2017 IEEE Southern Power Electronics Conference (SPEC) 2017, 1 -6.
AMA StyleM. F. C. Campos, D. I. Brandao, V. F. Mendes, L. M. F. Morais, S. I. Seleme. Control of a PMSG based wind power system using abc-frame under distorted and asymmetrical voltage conditions. 2017 IEEE Southern Power Electronics Conference (SPEC). 2017; ():1-6.
Chicago/Turabian StyleM. F. C. Campos; D. I. Brandao; V. F. Mendes; L. M. F. Morais; S. I. Seleme. 2017. "Control of a PMSG based wind power system using abc-frame under distorted and asymmetrical voltage conditions." 2017 IEEE Southern Power Electronics Conference (SPEC) , no. : 1-6.
In literature it is known that the tuning of nonlinear controllers is different from the classic control approach, since it is not given directly, because of the Laplace transform term. In this sense, the main goal of this work is to deduce intuitive method to obtain the nonlinear controllers gains for SFL and PBC applied to the PFC boost converter, a subject little discussed in nonlinear control background. These two methods are taken together due to the similarities in the equations.
A. H. R. Rosa; W. C. Alves; M. B. E. Silva; M. F. C. Campos; R. A. S. Santana; Lenin Morais; M. A. S. Mendes; S. I. Seleme. Thdi qualitative method for tuning of non-linear SFL and PBC controllers applied to boost PFC converter. 2017 IEEE Southern Power Electronics Conference (SPEC) 2017, 1 -6.
AMA StyleA. H. R. Rosa, W. C. Alves, M. B. E. Silva, M. F. C. Campos, R. A. S. Santana, Lenin Morais, M. A. S. Mendes, S. I. Seleme. Thdi qualitative method for tuning of non-linear SFL and PBC controllers applied to boost PFC converter. 2017 IEEE Southern Power Electronics Conference (SPEC). 2017; ():1-6.
Chicago/Turabian StyleA. H. R. Rosa; W. C. Alves; M. B. E. Silva; M. F. C. Campos; R. A. S. Santana; Lenin Morais; M. A. S. Mendes; S. I. Seleme. 2017. "Thdi qualitative method for tuning of non-linear SFL and PBC controllers applied to boost PFC converter." 2017 IEEE Southern Power Electronics Conference (SPEC) , no. : 1-6.
With the constant increase of energy consumption in the world, the efficiency of systems and equipment is becoming more important. Silicon Carbide devices are emerging as an opportunity to construct power converters with higher efficiency and higher power density, although they still have considerable cost. The main purpose of this work is to do an extensive comparison covering several AC-DC and DC-AC converter topologies, using Silicon Carbide and/or Silicon devices, for UPS applications. The comparison is made under two operating conditions. Two hybrid AC-DC-AC cost-effective converters are proposed, one for each condition.
Wendell C. Alves; Lenin M. F. Morais; Porfírio C. Cortizo. Design of an efficient hybrid AC-DC-AC converter using silicon carbide for ups applications: A comparison. 2017 Brazilian Power Electronics Conference (COBEP) 2017, 1 -6.
AMA StyleWendell C. Alves, Lenin M. F. Morais, Porfírio C. Cortizo. Design of an efficient hybrid AC-DC-AC converter using silicon carbide for ups applications: A comparison. 2017 Brazilian Power Electronics Conference (COBEP). 2017; ():1-6.
Chicago/Turabian StyleWendell C. Alves; Lenin M. F. Morais; Porfírio C. Cortizo. 2017. "Design of an efficient hybrid AC-DC-AC converter using silicon carbide for ups applications: A comparison." 2017 Brazilian Power Electronics Conference (COBEP) , no. : 1-6.
In this paper, a Hardware in The Loop (HIL) platform was developed for the implementation of control techniques applied to static power converters. With this methodology, linear and nonlinear control techniques can be designed and compared - with low resources and available development time - to different types of power converters, such as Buck-Boost and Flyback. The converters, methods and control laws will be shown in detailed block diagrams, so that any student or engineer can reproduce the results. In addition, the HIL method became essential to dynamize and obtain experimental results, also presented in the dedicated section for both converters.
A. H. R. Rosa; M. B. E. Silva; M. F. C. Campos; R. A. S. Santana; M. A. S. Mendes; L. M. F. Morais; S. I. Seleme; P. C. Cortizo. HIL simulation of non linear control methods applied for buck-boost and flyback converters. 2017 Brazilian Power Electronics Conference (COBEP) 2017, 1 -6.
AMA StyleA. H. R. Rosa, M. B. E. Silva, M. F. C. Campos, R. A. S. Santana, M. A. S. Mendes, L. M. F. Morais, S. I. Seleme, P. C. Cortizo. HIL simulation of non linear control methods applied for buck-boost and flyback converters. 2017 Brazilian Power Electronics Conference (COBEP). 2017; ():1-6.
Chicago/Turabian StyleA. H. R. Rosa; M. B. E. Silva; M. F. C. Campos; R. A. S. Santana; M. A. S. Mendes; L. M. F. Morais; S. I. Seleme; P. C. Cortizo. 2017. "HIL simulation of non linear control methods applied for buck-boost and flyback converters." 2017 Brazilian Power Electronics Conference (COBEP) , no. : 1-6.
The contribution of this paper has been focused on investigating a new microgrid architecture that integrates the electronic transformer (SST, the acronym Solid State Transformer) with microgrids system. The design of the converters required for implementation of the electronic transformer are dealt. The work to provide an infrastructure for creating an intelligent energy system, which will enable the integration of smart grid concepts, microrrede generation distribute and distribution of direct current. The advantages of SST, listed the reduction of the volume and weight as well as fault isolation capability, voltage regulation, harmonic filtering, reactive power compensation and power factor correction. The work presents the advantages of applying the SST in a microgrid system. Therefore, simulation results in MATLAB/Simulink software are presented.
W. A. Rodrigues; Lenin Morais; Thiago Oliveira; R. A. S. Santana; A. P. L. Cota; W. W. A. G. Silva. Analysis of Solid State Transformer based microgrid system. 2016 12th IEEE International Conference on Industry Applications (INDUSCON) 2017, 1 -6.
AMA StyleW. A. Rodrigues, Lenin Morais, Thiago Oliveira, R. A. S. Santana, A. P. L. Cota, W. W. A. G. Silva. Analysis of Solid State Transformer based microgrid system. 2016 12th IEEE International Conference on Industry Applications (INDUSCON). 2017; ():1-6.
Chicago/Turabian StyleW. A. Rodrigues; Lenin Morais; Thiago Oliveira; R. A. S. Santana; A. P. L. Cota; W. W. A. G. Silva. 2017. "Analysis of Solid State Transformer based microgrid system." 2016 12th IEEE International Conference on Industry Applications (INDUSCON) , no. : 1-6.
This paper investigates a Solid State Transformer (SST) based DC microgrid architecture, addressing the design and control of the multiple SST power conversion stages and the power management strategy required for its integration with other microgrid elements, such as storage devices and local distributed generation. The advantages of a SST in relation to conventional low frequency transformers are commonly listed as a substantial reduction of volume and weight, fault isolation capability, voltage regulation, harmonic filtering, reactive power compensation and power factor correction. The SST also constitutes the required infrastructure that will enable DC power distribution to homes and commercial buildings in the near future and provides a more efficient way to integrate storage devices and distributed generation into the electrical grid. In this sense the SST behaves as an energy router, which represents a key element in an intelligent power system. The behavior of the proposed architecture for different operating conditions and disturbances will be assessed through computational simulations in the software MATLAB/Simulink.
W. A. Rodrigues; R. A. S. Santana; A. P. L. Cota; Thiago Oliveira; Lenin Morais; P. C. Cortizo. Integration of solid state transformer with DC microgrid system. 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) 2017, 1 -6.
AMA StyleW. A. Rodrigues, R. A. S. Santana, A. P. L. Cota, Thiago Oliveira, Lenin Morais, P. C. Cortizo. Integration of solid state transformer with DC microgrid system. 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC). 2017; ():1-6.
Chicago/Turabian StyleW. A. Rodrigues; R. A. S. Santana; A. P. L. Cota; Thiago Oliveira; Lenin Morais; P. C. Cortizo. 2017. "Integration of solid state transformer with DC microgrid system." 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) , no. : 1-6.
This paper presents the design of a digital control strategy for a dc-dc type Buck converter used as an efficient lead acid battery charger in isolated electric photovoltaic systems. The strategy is designed to be implemented in a digital signal processor (DSP). The control acts depending on the state of charge of the batteries by regulating the drive duty cycle with the proper combination of incremental conductance MPPT technique and precise control of the battery current according to three charging stages, providing a joint solution which on one hand maximizes the production of solar energy available in the PV array, and on the other ensures a long battery lifetime, both aspects, which are generally investigated independently in technical literature, are treated simultaneously in our approach. The work explains in detail the converter modeling, the project of the compensator, as well as the development of MPPT used. Validation simulations are done via Matlab and experimental results from a prototype low power TMS320F2812 using a DSP from Texas Instruments, are provided and discussed, which show satisfactory performance of the proposed control system.
Julio López; S.I. Seleme; P.F. Donoso; Lenin Morais; P.C. Cortizo; M.A. Severo. Digital control strategy for a buck converter operating as a battery charger for stand-alone photovoltaic systems. Solar Energy 2016, 140, 171 -187.
AMA StyleJulio López, S.I. Seleme, P.F. Donoso, Lenin Morais, P.C. Cortizo, M.A. Severo. Digital control strategy for a buck converter operating as a battery charger for stand-alone photovoltaic systems. Solar Energy. 2016; 140 ():171-187.
Chicago/Turabian StyleJulio López; S.I. Seleme; P.F. Donoso; Lenin Morais; P.C. Cortizo; M.A. Severo. 2016. "Digital control strategy for a buck converter operating as a battery charger for stand-alone photovoltaic systems." Solar Energy 140, no. : 171-187.