Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065484
L. J. Lemes, Victor Regis Bernardeli, L. Gomes, Darizon Alves de Andrade, G. P. Viajante, Marcos Antonio Arantes de Freitas
This paper presents an analysis of the SRG operating in self-excited mode, with Half Bridge converter and a parallel capacitor. The simulations are performed based on a nonlinear model considering the effect of magnetic saturation, the model equations are described on this paper. The model allows static simulations to build the inductance, flux and torque profiles, as well as the dynamic simulations. Analyses about the effect of rotor speed and triggers angles over a resistive load are realized.
{"title":"Dynamic Analysis of Self-excited SRG Operating in Open Loop","authors":"L. J. Lemes, Victor Regis Bernardeli, L. Gomes, Darizon Alves de Andrade, G. P. Viajante, Marcos Antonio Arantes de Freitas","doi":"10.1109/COBEP/SPEC44138.2019.9065484","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065484","url":null,"abstract":"This paper presents an analysis of the SRG operating in self-excited mode, with Half Bridge converter and a parallel capacitor. The simulations are performed based on a nonlinear model considering the effect of magnetic saturation, the model equations are described on this paper. The model allows static simulations to build the inductance, flux and torque profiles, as well as the dynamic simulations. Analyses about the effect of rotor speed and triggers angles over a resistive load are realized.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72560314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065872
R. Oliveira, Tofoli Lessa, M. Flores
With the increasing use of wind energy conversion systems, it is important to study different aspects of the different technologies employed in these systems. The key of the variable speed technologies is the power converter, thus the properly design and evaluation of its behavior is important. In this work, a thermal modeling of a wind energy conversion system (WECS) using doubly fed induction generator (DFIG) technology is developed, which evaluates the behavior of the junction temperature of the semiconductors devices that compose the power converters of the system. The system is modeled using the PLECS software and results of a 2.5 MW system are presented in different operation conditions to demonstrate the modeling.
{"title":"Thermal Modeling of Converters for Wind Conversion Systems Employing DFIG Technology","authors":"R. Oliveira, Tofoli Lessa, M. Flores","doi":"10.1109/COBEP/SPEC44138.2019.9065872","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065872","url":null,"abstract":"With the increasing use of wind energy conversion systems, it is important to study different aspects of the different technologies employed in these systems. The key of the variable speed technologies is the power converter, thus the properly design and evaluation of its behavior is important. In this work, a thermal modeling of a wind energy conversion system (WECS) using doubly fed induction generator (DFIG) technology is developed, which evaluates the behavior of the junction temperature of the semiconductors devices that compose the power converters of the system. The system is modeled using the PLECS software and results of a 2.5 MW system are presented in different operation conditions to demonstrate the modeling.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75946633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065774
Ana Carolina Moreira, Daniel Cesar Piccoli, Júlio Cesar Lopes de Oliveira, Luiz Fernando Henning, R. Piontkewicz
This article shows a study of the dissipative passive RC snubber configurations, by using theoretical and experimental data. For that, the buck converter is use to analyse the impact of these devices in the circuit. Three projects of the RC snubber are analyse and compare, with that the device that shows a better performance in the circuit will be obtained.
{"title":"Comparative study of RC snubber configurations in switching circuits","authors":"Ana Carolina Moreira, Daniel Cesar Piccoli, Júlio Cesar Lopes de Oliveira, Luiz Fernando Henning, R. Piontkewicz","doi":"10.1109/COBEP/SPEC44138.2019.9065774","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065774","url":null,"abstract":"This article shows a study of the dissipative passive RC snubber configurations, by using theoretical and experimental data. For that, the buck converter is use to analyse the impact of these devices in the circuit. Three projects of the RC snubber are analyse and compare, with that the device that shows a better performance in the circuit will be obtained.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72675718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065735
F. F. Almeida, Felipe Guerra, F. A. Serrão Gonçalves
The number of grid-connected photovoltaic systems has been growing in the world as a sustainable alternative for power generation. This paper presents a study of Z-source inverter applied to a low voltage residential photovoltaic microgeneration system. The ZSI topology is evaluated through the expressions related to its equivalent electrical circuits, with the differential of considering asymmetry and accounting for the ohmic losses due to the equivalent series resistances in the inductors and capacitors of the impedance network. In addition to the mathematical model of the ZSI converter, it is also presented a design methodology for the selection of impedance network elements. Finally, computational simulations considering the Simple Boost modulation technique are developed to evaluate the performance and effectiveness of the proposed system.
{"title":"Z-Source Inverter for Photovoltaic Microgeneration","authors":"F. F. Almeida, Felipe Guerra, F. A. Serrão Gonçalves","doi":"10.1109/COBEP/SPEC44138.2019.9065735","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065735","url":null,"abstract":"The number of grid-connected photovoltaic systems has been growing in the world as a sustainable alternative for power generation. This paper presents a study of Z-source inverter applied to a low voltage residential photovoltaic microgeneration system. The ZSI topology is evaluated through the expressions related to its equivalent electrical circuits, with the differential of considering asymmetry and accounting for the ohmic losses due to the equivalent series resistances in the inductors and capacitors of the impedance network. In addition to the mathematical model of the ZSI converter, it is also presented a design methodology for the selection of impedance network elements. Finally, computational simulations considering the Simple Boost modulation technique are developed to evaluate the performance and effectiveness of the proposed system.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75132562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065752
R. A. da Camara, Luis M. Fernández‐Ramírez, P. Praça, D. de S. Oliveira, Pablo García-Triviño, Raúl Sarrias-Mena
This paper presents an application of the multi-port bidirectional three-phase ac-dc converter as interface between a microgrid composed by several power sources and an electric vehicle charging station (EVCS). The main advantage of using this converter is that it can integrate multiple power sources and loads into a single power conversion stage and thus control the power flow between them reducing the number of power conversion stages and / or devices as well as weight and volume of the entire system and the control architecture does not require communication strucure as main current solutions in this field present. The microgrid of this study was composed of a photovoltaic system, a battery energy storage system, two 48 kW fast charging units for electricle vehicles, a connection to the local grid and the multi-port bidirectional converter with minor changes to be able in this type of application with a rated power at 100 kW. Simulation results obtained from a system model are presented and discussed in order to validate that under different power sources conditions the converter operates effectively confirming the feasibility of using this type of application in EVCS microgrid technology.
{"title":"An Application of the Multi-Port Bidirectional Three-Phase AC-DC Converter in Electric Vehicle Charging Station Microgrid","authors":"R. A. da Camara, Luis M. Fernández‐Ramírez, P. Praça, D. de S. Oliveira, Pablo García-Triviño, Raúl Sarrias-Mena","doi":"10.1109/COBEP/SPEC44138.2019.9065752","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065752","url":null,"abstract":"This paper presents an application of the multi-port bidirectional three-phase ac-dc converter as interface between a microgrid composed by several power sources and an electric vehicle charging station (EVCS). The main advantage of using this converter is that it can integrate multiple power sources and loads into a single power conversion stage and thus control the power flow between them reducing the number of power conversion stages and / or devices as well as weight and volume of the entire system and the control architecture does not require communication strucure as main current solutions in this field present. The microgrid of this study was composed of a photovoltaic system, a battery energy storage system, two 48 kW fast charging units for electricle vehicles, a connection to the local grid and the multi-port bidirectional converter with minor changes to be able in this type of application with a rated power at 100 kW. Simulation results obtained from a system model are presented and discussed in order to validate that under different power sources conditions the converter operates effectively confirming the feasibility of using this type of application in EVCS microgrid technology.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79772201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065743
G. Azevedo, E. C. Oliveira, M. Cavalcanti, L. Limongi
This work brings a comparative study of the main techniques of power sharing for microgrids operating in the autonomous mode. The techniques considered here are the droop control for inductive and resistive lines and the derivative voltage droop. A set of figures of merit is defined in order to perform a helpful and reliable comparison. Also, it is considered a simple three-phase microgrid with two converters and loads where is evaluated the influence of the microgrid line impedances and the power sharing techniques. The simulation results bring valuable insights regarding the steady state performance of the evaluated power sharing techniques.
{"title":"Comparative Study of the Power Sharing Techniques for Microgrids in Autonomous Mode","authors":"G. Azevedo, E. C. Oliveira, M. Cavalcanti, L. Limongi","doi":"10.1109/COBEP/SPEC44138.2019.9065743","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065743","url":null,"abstract":"This work brings a comparative study of the main techniques of power sharing for microgrids operating in the autonomous mode. The techniques considered here are the droop control for inductive and resistive lines and the derivative voltage droop. A set of figures of merit is defined in order to perform a helpful and reliable comparison. Also, it is considered a simple three-phase microgrid with two converters and loads where is evaluated the influence of the microgrid line impedances and the power sharing techniques. The simulation results bring valuable insights regarding the steady state performance of the evaluated power sharing techniques.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79120229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065614
Marcos Dantas, F. Oliveira, Lorena Albuquerque, I. Freitas, R. Andersen
Dc-dc power conversion has been an important topic research in the last years, due to increased use of distributed generation, electric vehicles, energy storage and uninterruptible power supplies. In these applications, it is common to have situations where there’s no specific load or power supply side, that is, both sides can behave like a power supply or a load, which highlights the importance of studying bidirectional converters. This paper proposes a new hybrid push-pull dc-dc converter with a switched capacitor ladder cell and will be presented the converter analysis, deduction of mathematical equations of static gain and design, control strategy and simulation results. The advantages of this topology are bidirectionality, soft switching, high gain, natural voltage clamping, reduced switch voltage and high-frequency isolation.
{"title":"A Hybrid Bidirectional Push-Pull DC-DC Converter with a Ladder Switched-Capacitor Cell","authors":"Marcos Dantas, F. Oliveira, Lorena Albuquerque, I. Freitas, R. Andersen","doi":"10.1109/COBEP/SPEC44138.2019.9065614","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065614","url":null,"abstract":"Dc-dc power conversion has been an important topic research in the last years, due to increased use of distributed generation, electric vehicles, energy storage and uninterruptible power supplies. In these applications, it is common to have situations where there’s no specific load or power supply side, that is, both sides can behave like a power supply or a load, which highlights the importance of studying bidirectional converters. This paper proposes a new hybrid push-pull dc-dc converter with a switched capacitor ladder cell and will be presented the converter analysis, deduction of mathematical equations of static gain and design, control strategy and simulation results. The advantages of this topology are bidirectionality, soft switching, high gain, natural voltage clamping, reduced switch voltage and high-frequency isolation.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79390257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065417
M. A. Mendes, M. C. Vargas, O. E. Batista, Yongheng Yang, F. Blaabjerg
Power systems simulations become more relevant to analyze the feeder behavior due to the increasing integration of inverter-based resources (IBR), like solar photovoltaic (PV). However, simulations based on dynamic and switching-level PV generator (DSLPVG) models are complicated to implement, due to the multi-variable dependence, and they are time-consuming. Thus, this paper introduces a simple single-phase grid-connected PV generator model. This simplified PV generator (SPVG) model is only dependent of the PV generator active output power, power factor, and the voltage at the point of common coupling (PCC). It is developed in Simulink/MATLAB with a single-phase feeder. Simulations are conducted to verify the proposed model by comparing SPVG with DSLPVG models in terms of feeder behavior, accuracy and time elapsed during simulations. The implementation of the SPVG model is easier than the DSLPVG, the feeder behavior is similar, and the simulations are almost 120 times faster. With the SPVG model, fast simulations with many PV generators may be done, like power system protection studies, while maintaining good accuracy. Furthermore, the model can be easily extended to other simulation software packages.
{"title":"Simplified Single-phase PV Generator Model for Distribution Feeders With High Penetration of Power Electronics-based Systems","authors":"M. A. Mendes, M. C. Vargas, O. E. Batista, Yongheng Yang, F. Blaabjerg","doi":"10.1109/COBEP/SPEC44138.2019.9065417","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065417","url":null,"abstract":"Power systems simulations become more relevant to analyze the feeder behavior due to the increasing integration of inverter-based resources (IBR), like solar photovoltaic (PV). However, simulations based on dynamic and switching-level PV generator (DSLPVG) models are complicated to implement, due to the multi-variable dependence, and they are time-consuming. Thus, this paper introduces a simple single-phase grid-connected PV generator model. This simplified PV generator (SPVG) model is only dependent of the PV generator active output power, power factor, and the voltage at the point of common coupling (PCC). It is developed in Simulink/MATLAB with a single-phase feeder. Simulations are conducted to verify the proposed model by comparing SPVG with DSLPVG models in terms of feeder behavior, accuracy and time elapsed during simulations. The implementation of the SPVG model is easier than the DSLPVG, the feeder behavior is similar, and the simulations are almost 120 times faster. With the SPVG model, fast simulations with many PV generators may be done, like power system protection studies, while maintaining good accuracy. Furthermore, the model can be easily extended to other simulation software packages.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76806858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065773
G. S. Schowantz, R. P. Barcelos, T. Lazzarin
This paper presents a full analysis on a single-phase PFC (Power Factor Correction) Flyback rectifier. The study approaches all design equations, including input filter and leakage inductance loss, for operation in DCM (Discontinuous Conduction Mode) and in CCM (Continuous Conduction Mode). Both operation modes are compared in the paper using a designed example. In addition, it is introduced a single-stage bridgeless Flyback rectifier and it is compared with other isolated and non-isolated similar topologies. Finally, in order to make the bridgeless version a modular solution, it is designed to operate in interleaved with 3 modules, tripling the rated power and reducing the input filter.
{"title":"Single-Stage Bridgeless AC-DC PFC Flyback Interleaved","authors":"G. S. Schowantz, R. P. Barcelos, T. Lazzarin","doi":"10.1109/COBEP/SPEC44138.2019.9065773","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065773","url":null,"abstract":"This paper presents a full analysis on a single-phase PFC (Power Factor Correction) Flyback rectifier. The study approaches all design equations, including input filter and leakage inductance loss, for operation in DCM (Discontinuous Conduction Mode) and in CCM (Continuous Conduction Mode). Both operation modes are compared in the paper using a designed example. In addition, it is introduced a single-stage bridgeless Flyback rectifier and it is compared with other isolated and non-isolated similar topologies. Finally, in order to make the bridgeless version a modular solution, it is designed to operate in interleaved with 3 modules, tripling the rated power and reducing the input filter.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76013443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/COBEP/SPEC44138.2019.9065856
Leonilson dos Santos Veras, H. A. Oliveira, J. G. de Matos, O. Saavedra, Luiz A. de Sousa Ribeiro, Lucas de Paula Assunção Pinheiro
Microgrids has emerged as an attractive solution to ensure electric power supply for remote locations, such as islands isolated from the continents. Sometimes, microgrids that have already been deployed need to be refurbished, either to keep up with the growing power demand or to replace end-of-life equipment. This paper reports the enhancement process that was carried out in a real microgrid system deployed in the northeast of Brazil. A comparative analysis of the microgrid operation performance is developed. The benefits of the refurbishment, both in terms of efficiency and power quality are also evaluated.
{"title":"Analysis of Performance and Opportunity for Improvements in the Microgrid of Ilha Grande","authors":"Leonilson dos Santos Veras, H. A. Oliveira, J. G. de Matos, O. Saavedra, Luiz A. de Sousa Ribeiro, Lucas de Paula Assunção Pinheiro","doi":"10.1109/COBEP/SPEC44138.2019.9065856","DOIUrl":"https://doi.org/10.1109/COBEP/SPEC44138.2019.9065856","url":null,"abstract":"Microgrids has emerged as an attractive solution to ensure electric power supply for remote locations, such as islands isolated from the continents. Sometimes, microgrids that have already been deployed need to be refurbished, either to keep up with the growing power demand or to replace end-of-life equipment. This paper reports the enhancement process that was carried out in a real microgrid system deployed in the northeast of Brazil. A comparative analysis of the microgrid operation performance is developed. The benefits of the refurbishment, both in terms of efficiency and power quality are also evaluated.","PeriodicalId":69617,"journal":{"name":"电力电子","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86811356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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