Fernando P I N H A B E L Marafao (original) (raw)
Papers by Fernando P I N H A B E L Marafao
2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC)
This paper presents a computational model for studying the energy flow at the integration of a ba... more This paper presents a computational model for studying the energy flow at the integration of a battery bank (BB) to a DC microgrid, through the use of the Dual Active Bridge (DAB) converter. The one time constant model was adopted for the battery, with its parameters obtained through exponential regression by the Least Squares method, through its hysteresis curve between terminal voltage and load level percentage. The curve was synthesized by data collected from a LiFeYPO4 reference battery. The DAB converter was controlled by the Phase-Shift modulation technique. The converter power management occurs through a state machine, which defines the conditions of energy flow between the microgrid and the energy storage system. This paper has educational aims for the study of energy flow at the integration of BB into DC microgrids.
Advanced Engineering Informatics, 2022
2016 12th IEEE International Conference on Industry Applications (INDUSCON), 2016
This paper discusses the design of a virtual instrument for the analysis of three-phase four-wire... more This paper discusses the design of a virtual instrument for the analysis of three-phase four-wire circuits. Although the flexibility of the proposed instrument in terms of using different methodologies, this paper focuses on the evaluation of several power terms defined in STD 1459 and FDB (Fryze-Buchholz-Depenbrock) approaches. Laboratory measurements are presented and discussed in order to evaluate the developed instrument and the considered power theories.
2021 Brazilian Power Electronics Conference (COBEP), 2021
The impedance source network inverters have interesting operational advantages over conventional ... more The impedance source network inverters have interesting operational advantages over conventional inverters, allowing flexible operation as step-up/step-down converters, without the need to avoid simultaneous conduction of power switches located at the same inverter leg. In this context, inverters based on Y -type impedance networks have convenient features which solve several issues related to photovoltaic (PV) applications. Nevertheless, the non- minimum phase characteristics of such converter makes the control design complex. Therefore, this paper presents a complete modelling and control methodology which allows the integration of the Y-Source inverter (YSI) in a stand-alone single-phase photovoltaic generation application. The small-signal model for YSI is presented in detail together with design methodologies for the DC and AC side controllers. Moreover, the proposed control schemes were validated with computer simulations considering the Y -source inverter feeding both linear and non-linear loads.
2017 Brazilian Power Electronics Conference (COBEP), 2017
The paper presents an Android application with a friendly and interactive approach to aid the tea... more The paper presents an Android application with a friendly and interactive approach to aid the teaching of AC-to-DC converters operating in steady-state. Some features of the proposed application are demonstrated through examples, and forms of integration in teaching activities are addressed.
IEEE Transactions on Industrial Electronics, 2021
Beyond the impacting presence of nonlinear loads, low-voltage microgrids also experience low ener... more Beyond the impacting presence of nonlinear loads, low-voltage microgrids also experience low energy efficiency and resonance phenomena when operating interconnected to a distribution grid that suffers from distorted voltages. This article proposes a model-free control strategy capable of coordinating inverters existing within a dispatchable microgrid, allowing to operate it as a single-controllable entity that behaves like a resistor at selected harmonic frequencies. Such resistive shaping uses a centralized control architecture to steer inverters to distributively compensate reactive and harmonic currents, supporting active current sharing. Consequently, the microgrid point-of-common-coupling operates with a high power factor when the grid imposes distorted voltages. Additionally, if resonant components exist, the strategy supports harmonic resonance damping, which minimizes deterioration of voltage quality. For instance, comparative results show that, for the considered scenario, the proposed resistive shaping damps resonances up to 50% better than a previous approach that compensates harmonics using sinusoidal current synthesis. Simulation results carried out on a three-phase low-voltage microgrid testbench, considering three inverters, demonstrate the abovementioned capabilities of the proposed approach. Experimental results based on a single-phase microgrid prototype comprising two inverters with two linear loads and one nonlinear load validate the applicability of the method to real-life implementations.
2021 14th IEEE International Conference on Industry Applications (INDUSCON), 2021
Este trabalho apresenta a implementação de um filtro ativo de potência universal (FAPU) monofásic... more Este trabalho apresenta a implementação de um filtro ativo de potência universal (FAPU) monofásico, que consiste da integração de um filtro ativo paralelo e um filtro ativo série, com o objetivo de realizar a compensação de distúrbios relacionados a tensão e a corrente de forma simultânea. A abordagem proposta para o FAPU permite que a corrente pela rede seja senoidal e em fase com a tensão, e as cargas sejam fornecidas com tensão eficaz constante e forma de onda senoidal. Para gerar o sinal de referência da corrente é utilizada a Teoria de Potência Conservativa além de um controlador do tipo proporcional ressonante para controlar os sinais de tensão e corrente. Resultados de simulação são apresentados mostrando a eficácia da estratégia de compensação proposta.
Energy Informatics, 2020
This paper presents a novel Non-Intrusive Load Monitoring (NILM) approach focusing on the Energy ... more This paper presents a novel Non-Intrusive Load Monitoring (NILM) approach focusing on the Energy Efficiency (EE) assessment of residential appliances. This approach (NILMEE) is able to identify the individual consumption of several household devices, providing proper information for evaluating energy efficiency and pointing out the operational issues or labelling mismatches of appliances, while recommending better practices for energy usage in specific consumer installations. The proposed approach was developed and evaluated by embedding the NILM engine on an electronic power meter, which performs a microscopic analysis on measured voltages and currents and provides the load disaggregation using the Conservative Power Theory for the feature extraction, K-Nearest Neighbours for the appliance classification, and the Power Signature Blob for the energy disaggregation. The disaggregation algorithm performance evaluation is carried out using NILMTK. Results show that NILM transcends the ...
Journal of Control, Automation and Electrical Systems, 2017
IEEE Transactions on Smart Grid, 2019
IEEE Transactions on Smart Grid, 2018
Proceedings XXII Congresso Brasileiro de Autom�tica, 2018
This paper uses the power-based control strategy to coordinate distributed inverters of diverse c... more This paper uses the power-based control strategy to coordinate distributed inverters of diverse characteristics within a low-voltage microgrid. In a three-phase four-wire system, the distributed inverters can be three-phase and single-phase. This latter can be connected between phases, or between phase and neutral. In addition, there are the constructive diversities of each inverter, for example, the limitation of processing reactive power or the impossibility of unbalanced operation. The proposed strategy makes it possible to accommodate all sorts of distributed units, complying with their self-imposed limitations, and also to achieve power quality requirements and power flow control exchanged with the power grid. Simulation results analyze the dynamic and steady-state performance of such control strategy for microgrids using a real network typical of urban areas. Keywords— Distributed power generation, Hierarchical control, Microgrids, Unbalance compensation, Zero sequence compensation. Resumo— Esse artigo utiliza a estratégia de controle baseado em potência (power-based control) para coordenar inversores distribúıdos de caracteŕısticas diversas dentro de uma microrrede de baixa tensão. Em um sistema trifásico com quatro fios, os inversores distribúıdos podem ser trifásicos e monofásicos. Estes últimos podem ser conectados entre fases, ou entre fase e neutro. Além disso, existem as diversidades construtivas de cada inversor, por exemplo limitação de processar potência reativa ou impossibilidade de operação desbalanceado. A estratégia proposta possibilita acomodar todos os tipos de unidades distribúıdas respeitando suas limitações, e ainda atender restrições de qualidade de energia e controle do fluxo de potência trocada com a rede elétrica. Resultados de simulação analisam o desempenho dinâmico e em regime permanente de tal estratégia de controle para microrredes usando uma rede em anel real t́ıpica de zona urbana. Palavras-chave— Compensação de desbalanço, Compensação de sequência zero, Controle hierárquico, Geração de energia distribúıda, Microrredes.
Journal of Control, Automation and Electrical Systems, 2018
IET Power Electronics, 2016
O objetivo é descrever um projeto para um controlador multi-malha de um Restaurador Dinâmico de T... more O objetivo é descrever um projeto para um controlador multi-malha de um Restaurador Dinâmico de Tensão (DVR), o qual é responsável por manter a tensão que alimenta um equipamento dentro de padrões que assegurem seu bom funcionamento.
Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04., 2004
ABSTRACT
Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04.
ABSTRACT
IEEE 36th Conference on Power Electronics Specialists, 2005.
This paper proposes a novel and simple positive sequence detector (PSD), which is inherently self... more This paper proposes a novel and simple positive sequence detector (PSD), which is inherently self-adjustable to fundamental frequency deviations by means of a software-based PLL (phase locked loop). Since the proposed positive sequence detector is not based on Fortescue's classical decomposition and no special input filtering is needed, its dynamic response may be as fast as one fundamental cycle. The
2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC)
This paper presents a computational model for studying the energy flow at the integration of a ba... more This paper presents a computational model for studying the energy flow at the integration of a battery bank (BB) to a DC microgrid, through the use of the Dual Active Bridge (DAB) converter. The one time constant model was adopted for the battery, with its parameters obtained through exponential regression by the Least Squares method, through its hysteresis curve between terminal voltage and load level percentage. The curve was synthesized by data collected from a LiFeYPO4 reference battery. The DAB converter was controlled by the Phase-Shift modulation technique. The converter power management occurs through a state machine, which defines the conditions of energy flow between the microgrid and the energy storage system. This paper has educational aims for the study of energy flow at the integration of BB into DC microgrids.
Advanced Engineering Informatics, 2022
2016 12th IEEE International Conference on Industry Applications (INDUSCON), 2016
This paper discusses the design of a virtual instrument for the analysis of three-phase four-wire... more This paper discusses the design of a virtual instrument for the analysis of three-phase four-wire circuits. Although the flexibility of the proposed instrument in terms of using different methodologies, this paper focuses on the evaluation of several power terms defined in STD 1459 and FDB (Fryze-Buchholz-Depenbrock) approaches. Laboratory measurements are presented and discussed in order to evaluate the developed instrument and the considered power theories.
2021 Brazilian Power Electronics Conference (COBEP), 2021
The impedance source network inverters have interesting operational advantages over conventional ... more The impedance source network inverters have interesting operational advantages over conventional inverters, allowing flexible operation as step-up/step-down converters, without the need to avoid simultaneous conduction of power switches located at the same inverter leg. In this context, inverters based on Y -type impedance networks have convenient features which solve several issues related to photovoltaic (PV) applications. Nevertheless, the non- minimum phase characteristics of such converter makes the control design complex. Therefore, this paper presents a complete modelling and control methodology which allows the integration of the Y-Source inverter (YSI) in a stand-alone single-phase photovoltaic generation application. The small-signal model for YSI is presented in detail together with design methodologies for the DC and AC side controllers. Moreover, the proposed control schemes were validated with computer simulations considering the Y -source inverter feeding both linear and non-linear loads.
2017 Brazilian Power Electronics Conference (COBEP), 2017
The paper presents an Android application with a friendly and interactive approach to aid the tea... more The paper presents an Android application with a friendly and interactive approach to aid the teaching of AC-to-DC converters operating in steady-state. Some features of the proposed application are demonstrated through examples, and forms of integration in teaching activities are addressed.
IEEE Transactions on Industrial Electronics, 2021
Beyond the impacting presence of nonlinear loads, low-voltage microgrids also experience low ener... more Beyond the impacting presence of nonlinear loads, low-voltage microgrids also experience low energy efficiency and resonance phenomena when operating interconnected to a distribution grid that suffers from distorted voltages. This article proposes a model-free control strategy capable of coordinating inverters existing within a dispatchable microgrid, allowing to operate it as a single-controllable entity that behaves like a resistor at selected harmonic frequencies. Such resistive shaping uses a centralized control architecture to steer inverters to distributively compensate reactive and harmonic currents, supporting active current sharing. Consequently, the microgrid point-of-common-coupling operates with a high power factor when the grid imposes distorted voltages. Additionally, if resonant components exist, the strategy supports harmonic resonance damping, which minimizes deterioration of voltage quality. For instance, comparative results show that, for the considered scenario, the proposed resistive shaping damps resonances up to 50% better than a previous approach that compensates harmonics using sinusoidal current synthesis. Simulation results carried out on a three-phase low-voltage microgrid testbench, considering three inverters, demonstrate the abovementioned capabilities of the proposed approach. Experimental results based on a single-phase microgrid prototype comprising two inverters with two linear loads and one nonlinear load validate the applicability of the method to real-life implementations.
2021 14th IEEE International Conference on Industry Applications (INDUSCON), 2021
Este trabalho apresenta a implementação de um filtro ativo de potência universal (FAPU) monofásic... more Este trabalho apresenta a implementação de um filtro ativo de potência universal (FAPU) monofásico, que consiste da integração de um filtro ativo paralelo e um filtro ativo série, com o objetivo de realizar a compensação de distúrbios relacionados a tensão e a corrente de forma simultânea. A abordagem proposta para o FAPU permite que a corrente pela rede seja senoidal e em fase com a tensão, e as cargas sejam fornecidas com tensão eficaz constante e forma de onda senoidal. Para gerar o sinal de referência da corrente é utilizada a Teoria de Potência Conservativa além de um controlador do tipo proporcional ressonante para controlar os sinais de tensão e corrente. Resultados de simulação são apresentados mostrando a eficácia da estratégia de compensação proposta.
Energy Informatics, 2020
This paper presents a novel Non-Intrusive Load Monitoring (NILM) approach focusing on the Energy ... more This paper presents a novel Non-Intrusive Load Monitoring (NILM) approach focusing on the Energy Efficiency (EE) assessment of residential appliances. This approach (NILMEE) is able to identify the individual consumption of several household devices, providing proper information for evaluating energy efficiency and pointing out the operational issues or labelling mismatches of appliances, while recommending better practices for energy usage in specific consumer installations. The proposed approach was developed and evaluated by embedding the NILM engine on an electronic power meter, which performs a microscopic analysis on measured voltages and currents and provides the load disaggregation using the Conservative Power Theory for the feature extraction, K-Nearest Neighbours for the appliance classification, and the Power Signature Blob for the energy disaggregation. The disaggregation algorithm performance evaluation is carried out using NILMTK. Results show that NILM transcends the ...
Journal of Control, Automation and Electrical Systems, 2017
IEEE Transactions on Smart Grid, 2019
IEEE Transactions on Smart Grid, 2018
Proceedings XXII Congresso Brasileiro de Autom�tica, 2018
This paper uses the power-based control strategy to coordinate distributed inverters of diverse c... more This paper uses the power-based control strategy to coordinate distributed inverters of diverse characteristics within a low-voltage microgrid. In a three-phase four-wire system, the distributed inverters can be three-phase and single-phase. This latter can be connected between phases, or between phase and neutral. In addition, there are the constructive diversities of each inverter, for example, the limitation of processing reactive power or the impossibility of unbalanced operation. The proposed strategy makes it possible to accommodate all sorts of distributed units, complying with their self-imposed limitations, and also to achieve power quality requirements and power flow control exchanged with the power grid. Simulation results analyze the dynamic and steady-state performance of such control strategy for microgrids using a real network typical of urban areas. Keywords— Distributed power generation, Hierarchical control, Microgrids, Unbalance compensation, Zero sequence compensation. Resumo— Esse artigo utiliza a estratégia de controle baseado em potência (power-based control) para coordenar inversores distribúıdos de caracteŕısticas diversas dentro de uma microrrede de baixa tensão. Em um sistema trifásico com quatro fios, os inversores distribúıdos podem ser trifásicos e monofásicos. Estes últimos podem ser conectados entre fases, ou entre fase e neutro. Além disso, existem as diversidades construtivas de cada inversor, por exemplo limitação de processar potência reativa ou impossibilidade de operação desbalanceado. A estratégia proposta possibilita acomodar todos os tipos de unidades distribúıdas respeitando suas limitações, e ainda atender restrições de qualidade de energia e controle do fluxo de potência trocada com a rede elétrica. Resultados de simulação analisam o desempenho dinâmico e em regime permanente de tal estratégia de controle para microrredes usando uma rede em anel real t́ıpica de zona urbana. Palavras-chave— Compensação de desbalanço, Compensação de sequência zero, Controle hierárquico, Geração de energia distribúıda, Microrredes.
Journal of Control, Automation and Electrical Systems, 2018
IET Power Electronics, 2016
O objetivo é descrever um projeto para um controlador multi-malha de um Restaurador Dinâmico de T... more O objetivo é descrever um projeto para um controlador multi-malha de um Restaurador Dinâmico de Tensão (DVR), o qual é responsável por manter a tensão que alimenta um equipamento dentro de padrões que assegurem seu bom funcionamento.
Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04., 2004
ABSTRACT
Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04.
ABSTRACT
IEEE 36th Conference on Power Electronics Specialists, 2005.
This paper proposes a novel and simple positive sequence detector (PSD), which is inherently self... more This paper proposes a novel and simple positive sequence detector (PSD), which is inherently self-adjustable to fundamental frequency deviations by means of a software-based PLL (phase locked loop). Since the proposed positive sequence detector is not based on Fortescue's classical decomposition and no special input filtering is needed, its dynamic response may be as fast as one fundamental cycle. The