Pub Date : 2010-03-18DOI: 10.1109/APEC.2010.5433551
J.R. de Britto, F. D. da Silva, E. Coelho, Luis Carlos de Freitas, Valdeir Jose Farias e Joao Batista Vieira, J. B. Vieira
This paper describes the design and implementation of a Boost connected in cascade with a Quadratic Buck converter, with just one active switch, used to drive a LED string for public and private lighting purposes. The proposed converter supports a wide input voltage range that makes it possible to be supplied from 12 VDC to 340 VDC (240 VAC), without any additional adjustment. It can be used in hybrid electrical systems supplied by photovoltaic systems or 110/220 VAC from the utility power grid. Experimental results from an 11 W prototype are also presented.
{"title":"Proposal of a DC-DC converter with wide conversion range used in photovoltaic systems and utility power grid for the universal voltage range","authors":"J.R. de Britto, F. D. da Silva, E. Coelho, Luis Carlos de Freitas, Valdeir Jose Farias e Joao Batista Vieira, J. B. Vieira","doi":"10.1109/APEC.2010.5433551","DOIUrl":"https://doi.org/10.1109/APEC.2010.5433551","url":null,"abstract":"This paper describes the design and implementation of a Boost connected in cascade with a Quadratic Buck converter, with just one active switch, used to drive a LED string for public and private lighting purposes. The proposed converter supports a wide input voltage range that makes it possible to be supplied from 12 VDC to 340 VDC (240 VAC), without any additional adjustment. It can be used in hybrid electrical systems supplied by photovoltaic systems or 110/220 VAC from the utility power grid. Experimental results from an 11 W prototype are also presented.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116973978","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 : 2010-03-18DOI: 10.1109/APEC.2010.5433495
E. Agostini, I. Barbi
A novel three-phase dc-dc converter based on the three-phase neutral point clamped (NPC) commutation cell is proposed. A static analysis is made for a particular mode of operation, allowing the development of a design procedure for the power stage. The small-signal analysis based on the phasor transformation is also proposed, providing fundamental knowledge for a satisfactory compensation in closed-loop operation. From the theoretical analysis carried out, a design procedure is elaborated, providing the values of all power stage components. Finally, the simulation of a 10kW TPTL-PWM converter is performed to validate all theoretical considerations made in the paper.
{"title":"A novel three-phase three-level ZVS PWM DC-DC converter","authors":"E. Agostini, I. Barbi","doi":"10.1109/APEC.2010.5433495","DOIUrl":"https://doi.org/10.1109/APEC.2010.5433495","url":null,"abstract":"A novel three-phase dc-dc converter based on the three-phase neutral point clamped (NPC) commutation cell is proposed. A static analysis is made for a particular mode of operation, allowing the development of a design procedure for the power stage. The small-signal analysis based on the phasor transformation is also proposed, providing fundamental knowledge for a satisfactory compensation in closed-loop operation. From the theoretical analysis carried out, a design procedure is elaborated, providing the values of all power stage components. Finally, the simulation of a 10kW TPTL-PWM converter is performed to validate all theoretical considerations made in the paper.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125512199","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 : 2009-12-04DOI: 10.1109/COBEP.2009.5347705
G. Azevedo, P. Rodríguez, M. Cavalcanti, G. Vázquez, F. Neves
This paper presents a new control strategy that allows the photovoltaic system operation under grid faults without overcurrent and assuring grid sinusoidal currents. The current limiter is made indirectly by using an active power limiter that is calculated dynamically based on the grid positive-sequence voltage. The paper also shows that the classic control strategies used in the PV systems cause harmonic current injections on the electrical grid and dangerous overcurrents when voltage sags occur. The strategy presented here overcomes these drawbacks and allows the inverter operation under any unbalanced condition. The control is made on stationary reference frame using Proportional-Resonant current control. This new control strategy is compared to the classic strategy through simulations in PSCAD/EMTDC and the experimental results prove its effectiveness.
{"title":"New control strategy to allow the photovoltaic systems operation under grid faults","authors":"G. Azevedo, P. Rodríguez, M. Cavalcanti, G. Vázquez, F. Neves","doi":"10.1109/COBEP.2009.5347705","DOIUrl":"https://doi.org/10.1109/COBEP.2009.5347705","url":null,"abstract":"This paper presents a new control strategy that allows the photovoltaic system operation under grid faults without overcurrent and assuring grid sinusoidal currents. The current limiter is made indirectly by using an active power limiter that is calculated dynamically based on the grid positive-sequence voltage. The paper also shows that the classic control strategies used in the PV systems cause harmonic current injections on the electrical grid and dangerous overcurrents when voltage sags occur. The strategy presented here overcomes these drawbacks and allows the inverter operation under any unbalanced condition. The control is made on stationary reference frame using Proportional-Resonant current control. This new control strategy is compared to the classic strategy through simulations in PSCAD/EMTDC and the experimental results prove its effectiveness.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"77 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116767974","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 : 2009-12-04DOI: 10.1109/COBEP.2009.5347706
P. da Silva Oliveira, F. D. de Seixas, R. Fernandes
This work presents a study regarding the optimization of multipulse converters. A general expression for the connection (Δ or Y) for both 12 and 18-pulses is obtained and describes the output voltages on the secondary windings, depending on the voltage reference from the primary. These generalized expressions allows choosing different ratios between input and output voltages and as result an optimum operation point for the converter can be calculated. Considering Δ-connected converters the optimum point occurs when the magnetic core of the autotransformer processes 18% and 17% of the output power for 12 and 18-pulses, respectively. For Y-connected converters the optimum point occurs when the kVA rating is 13% and 18% for 12 and 18-pulses, respectively. Based on these results magnetic elements can be calculated and designed leading to a great weight and volume reduction and also to lower costs and losses. Finally an analysis is made to improve the kVA rating of the transformers for 12 and 18 pulses converters.
{"title":"Optimization of multipulse converters with delta and Y-differential connections","authors":"P. da Silva Oliveira, F. D. de Seixas, R. Fernandes","doi":"10.1109/COBEP.2009.5347706","DOIUrl":"https://doi.org/10.1109/COBEP.2009.5347706","url":null,"abstract":"This work presents a study regarding the optimization of multipulse converters. A general expression for the connection (Δ or Y) for both 12 and 18-pulses is obtained and describes the output voltages on the secondary windings, depending on the voltage reference from the primary. These generalized expressions allows choosing different ratios between input and output voltages and as result an optimum operation point for the converter can be calculated. Considering Δ-connected converters the optimum point occurs when the magnetic core of the autotransformer processes 18% and 17% of the output power for 12 and 18-pulses, respectively. For Y-connected converters the optimum point occurs when the kVA rating is 13% and 18% for 12 and 18-pulses, respectively. Based on these results magnetic elements can be calculated and designed leading to a great weight and volume reduction and also to lower costs and losses. Finally an analysis is made to improve the kVA rating of the transformers for 12 and 18 pulses converters.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125051403","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 : 2009-12-04DOI: 10.1109/COBEP.2009.5347731
J. Duarte, M. Mezaroba, L. Michels, C. Rech
This paper presents a single-stage isolated current rectifier with power factor correction, based on full bridge and flyback topologies. The proposed converter can operate as a step-down or a step-up converter, according to the input and output voltage levels. This paper presents the theoretical analysis of the converter as well as experimental results based on a 3.5 kW prototype.
{"title":"Full bridge — Flyback isolated current rectifier with power factor correction","authors":"J. Duarte, M. Mezaroba, L. Michels, C. Rech","doi":"10.1109/COBEP.2009.5347731","DOIUrl":"https://doi.org/10.1109/COBEP.2009.5347731","url":null,"abstract":"This paper presents a single-stage isolated current rectifier with power factor correction, based on full bridge and flyback topologies. The proposed converter can operate as a step-down or a step-up converter, according to the input and output voltage levels. This paper presents the theoretical analysis of the converter as well as experimental results based on a 3.5 kW prototype.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126117288","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 : 2009-12-04DOI: 10.1109/COBEP.2009.5347709
Felipe C. Camboim, R. D. Filho, F. Neves, E. Bueno, M. Cavalcanti
In this paper a new discrete-time sliding mode control scheme for three-phase PWM rectifiers is proposed. Active and reactive powers are directly controlled using a virtual-flux oriented reference frame. Robustness of the proposed methodology to filter inductance variation is shown. Simulation results of a rectifier connected to a large power system are presented to compare the performances of the proposed strategy and the voltage oriented control scheme. Experimental results also show the better performance of the proposed scheme.
{"title":"Discrete-time sliding mode direct power control for three-phase rectifiers","authors":"Felipe C. Camboim, R. D. Filho, F. Neves, E. Bueno, M. Cavalcanti","doi":"10.1109/COBEP.2009.5347709","DOIUrl":"https://doi.org/10.1109/COBEP.2009.5347709","url":null,"abstract":"In this paper a new discrete-time sliding mode control scheme for three-phase PWM rectifiers is proposed. Active and reactive powers are directly controlled using a virtual-flux oriented reference frame. Robustness of the proposed methodology to filter inductance variation is shown. Simulation results of a rectifier connected to a large power system are presented to compare the performances of the proposed strategy and the voltage oriented control scheme. Experimental results also show the better performance of the proposed scheme.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122303912","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 : 2009-12-04DOI: 10.1109/COBEP.2009.5347619
F. da Costa Lopes, E. Watanabe
Electrolyzers have been pointed out as a promising technology for use in energy storage applications. Basically, electrolyzers convert electrical energy to electrochemical energy, which stays encapsulated in diatomic hydrogen molecule for posterior use in fuel cells, which convert the electrochemical energy back to electrical energy. The main advantages of the electrolysis process are the zero-emission of greenhouse gases, the use of water as the source of hydrogen, and the high efficiency in energy conversion. Electrolyzers can be fed by the grid or by renewable sources such as solar and wind. In both cases a power converter is necessary to conditioning the electrical energy in order to deliver a clean DC current to the electrolyzer. In this context, this work shows a modeling of a PEM (proton exchange membrane) electrolyzer intending its use in conjunction with power converters. The main losses in such electrolyzer are modeled and it is shown the influence of the current ripple in the electrolyzer behavior and efficiency.
{"title":"Experimental and theoretical development of a PEM electrolyzer model applied to energy storage systems","authors":"F. da Costa Lopes, E. Watanabe","doi":"10.1109/COBEP.2009.5347619","DOIUrl":"https://doi.org/10.1109/COBEP.2009.5347619","url":null,"abstract":"Electrolyzers have been pointed out as a promising technology for use in energy storage applications. Basically, electrolyzers convert electrical energy to electrochemical energy, which stays encapsulated in diatomic hydrogen molecule for posterior use in fuel cells, which convert the electrochemical energy back to electrical energy. The main advantages of the electrolysis process are the zero-emission of greenhouse gases, the use of water as the source of hydrogen, and the high efficiency in energy conversion. Electrolyzers can be fed by the grid or by renewable sources such as solar and wind. In both cases a power converter is necessary to conditioning the electrical energy in order to deliver a clean DC current to the electrolyzer. In this context, this work shows a modeling of a PEM (proton exchange membrane) electrolyzer intending its use in conjunction with power converters. The main losses in such electrolyzer are modeled and it is shown the influence of the current ripple in the electrolyzer behavior and efficiency.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124635731","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 : 2009-12-04DOI: 10.1109/COBEP.2009.5347753
P. Praça, L. Bezerra, G. Henn, R. Silva, L. Barreto, R. Torrico-Bascopé
This paper presents the project and the implementation of a high frequency isolation pre-regulator for applications in UPS systems using an easy implementation control technique, which uses fewer sensors and has good performance (>90%), named self-control. The technique was carried out using a DSPIC from MICROCHIP. A 1 kW prototype was assembled and its experimental waveforms will be presented on this paper.
{"title":"High frequency isolation pre-regulator with power factor correction applied to UPS using self-control technique on a DSPIC","authors":"P. Praça, L. Bezerra, G. Henn, R. Silva, L. Barreto, R. Torrico-Bascopé","doi":"10.1109/COBEP.2009.5347753","DOIUrl":"https://doi.org/10.1109/COBEP.2009.5347753","url":null,"abstract":"This paper presents the project and the implementation of a high frequency isolation pre-regulator for applications in UPS systems using an easy implementation control technique, which uses fewer sensors and has good performance (>90%), named self-control. The technique was carried out using a DSPIC from MICROCHIP. A 1 kW prototype was assembled and its experimental waveforms will be presented on this paper.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129131412","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 : 2009-12-04DOI: 10.1109/COBEP.2009.5347677
R. Carnieletto, D. B. Ramos, M. Simões, F. Farret
An inverter control design in DQ reference frame takes 3-phase sinusoidal signals and converts them to the DQ-frame to make a 2-phase based DC variable control. The error is calculated by subtracting the feedback from reference and then feedding it to PI controllers. The outputs of PI controllers are of the voltage form and transferred back to the ABC frame and fed to SPWM modules. P+Resonant controllers suggest establishing the control strategy in stationary (alpha-beta) frame. In this frame the axis are fix and three phase variables are mapped in a rotating vector with the same angular speed of the original signals. The P+Resonant controller has zero steady state error at the resonant frequency. This paper explains how to apply DQ-frame and P+Resonant for inverter controller design for grid connected single-phase Voltage Source Inverters (VSI). To evaluate the effectiveness of both control techniques, it is also presented simulated results with application of these controllers.
{"title":"Simulation and analysis of DQ frame and P+Resonant controls for voltage source inverter to distributed generation","authors":"R. Carnieletto, D. B. Ramos, M. Simões, F. Farret","doi":"10.1109/COBEP.2009.5347677","DOIUrl":"https://doi.org/10.1109/COBEP.2009.5347677","url":null,"abstract":"An inverter control design in DQ reference frame takes 3-phase sinusoidal signals and converts them to the DQ-frame to make a 2-phase based DC variable control. The error is calculated by subtracting the feedback from reference and then feedding it to PI controllers. The outputs of PI controllers are of the voltage form and transferred back to the ABC frame and fed to SPWM modules. P+Resonant controllers suggest establishing the control strategy in stationary (alpha-beta) frame. In this frame the axis are fix and three phase variables are mapped in a rotating vector with the same angular speed of the original signals. The P+Resonant controller has zero steady state error at the resonant frequency. This paper explains how to apply DQ-frame and P+Resonant for inverter controller design for grid connected single-phase Voltage Source Inverters (VSI). To evaluate the effectiveness of both control techniques, it is also presented simulated results with application of these controllers.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123505825","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 : 2009-12-04DOI: 10.1109/COBEP.2009.5347719
C. Gehrke, M. de Campos, R. F. de Camargo, G. D. da Silva, F. Salvadori, C. Rech, A. Lima
This work presents an intelligent stand-alone system that is monitoring and analyzing results with the insertion of faults in this system. To fault detection it is used root mean square value combined with neural network. To ensure the fault signature, it was made different harmonic analysis simulations. The results obtained so far indicated that is possible detect the failure in the stand-alone system, so that, improving the repair of this system.
{"title":"Fault detection and diagnosis for stand alone system based on induction generator","authors":"C. Gehrke, M. de Campos, R. F. de Camargo, G. D. da Silva, F. Salvadori, C. Rech, A. Lima","doi":"10.1109/COBEP.2009.5347719","DOIUrl":"https://doi.org/10.1109/COBEP.2009.5347719","url":null,"abstract":"This work presents an intelligent stand-alone system that is monitoring and analyzing results with the insertion of faults in this system. To fault detection it is used root mean square value combined with neural network. To ensure the fault signature, it was made different harmonic analysis simulations. The results obtained so far indicated that is possible detect the failure in the stand-alone system, so that, improving the repair of this system.","PeriodicalId":183864,"journal":{"name":"2009 Brazilian Power Electronics Conference","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128169607","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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