Pub Date : 2017-11-01DOI: 10.1109/COBEP.2017.8257314
J. Schmidt, G. Azevedo, M. Cavalcanti, J. R. Pinheiro
Proper design of High-Frequency (HF) and Low-Frequency (LF) transformers parameters is one of the key elements for a high-performance isolated converters design. In practice, transformer designers have employed several techniques for achieve suitable designs, assuming rules of thumbs based on their expertise. In this paper, a design methodology for HF transformers based on product areas (Ap) that uses iterative processes in combination with rules of thumb for different specific variables, is presented and discussed. The most suitable design results for 100 kHz are implemented and validated to 1.5kW ZVS DC/DC Full-Bridge converter. Results shown the temperature rise achieve the estimated value of 13.9 °C, and a HF transformer efficiency of 99.64%, in which it brings converter efficiency close to 97.50% at rated power.
{"title":"A HF transformer design methodology for high efficiency isolated ZVS DC/DC converters","authors":"J. Schmidt, G. Azevedo, M. Cavalcanti, J. R. Pinheiro","doi":"10.1109/COBEP.2017.8257314","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257314","url":null,"abstract":"Proper design of High-Frequency (HF) and Low-Frequency (LF) transformers parameters is one of the key elements for a high-performance isolated converters design. In practice, transformer designers have employed several techniques for achieve suitable designs, assuming rules of thumbs based on their expertise. In this paper, a design methodology for HF transformers based on product areas (Ap) that uses iterative processes in combination with rules of thumb for different specific variables, is presented and discussed. The most suitable design results for 100 kHz are implemented and validated to 1.5kW ZVS DC/DC Full-Bridge converter. Results shown the temperature rise achieve the estimated value of 13.9 °C, and a HF transformer efficiency of 99.64%, in which it brings converter efficiency close to 97.50% at rated power.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128349462","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257369
J. C. S. D. de Morais, R. Gules, J. L. S. D. de Morais, L. G. Fernandes
In photovoltaic (PV) systems, high step-up dc-dc converters are required to manage the power flow. Since the output voltage of photovoltaic source is lower than the grid voltage level, dc-dc converters with high voltage gain are the solution in transformerless topologies. A high step-up dc-dc Ćuk converter with switched-inductor is proposed in this paper. The presented topology is designed to application in current source inverters (CSI) and unfolding inverters. Furthermore, to validate theoretical analysis, a 200W prototype is implemented. Lastly, a dc rectified sinusoidal output current modulation is performed to validate its application in unfolding inverters.
{"title":"Transformerless DC-DC converter with high voltage gain based on a switched-inductor structure applied to photovoltaic systems","authors":"J. C. S. D. de Morais, R. Gules, J. L. S. D. de Morais, L. G. Fernandes","doi":"10.1109/COBEP.2017.8257369","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257369","url":null,"abstract":"In photovoltaic (PV) systems, high step-up dc-dc converters are required to manage the power flow. Since the output voltage of photovoltaic source is lower than the grid voltage level, dc-dc converters with high voltage gain are the solution in transformerless topologies. A high step-up dc-dc Ćuk converter with switched-inductor is proposed in this paper. The presented topology is designed to application in current source inverters (CSI) and unfolding inverters. Furthermore, to validate theoretical analysis, a 200W prototype is implemented. Lastly, a dc rectified sinusoidal output current modulation is performed to validate its application in unfolding inverters.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129909450","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257362
R. Leborgne, Y. S. Stypulkowski
The choice of the best locations for reactive power compensation should be made taking into account the performance of the grid from the point of view of voltage regulation for normal and contingency grid operation, and other parameters such as SCR (Short Circuit Ratio). The elevation of the SCR helps to make the grid less weak, thus improving system performance, which influences the performance of some elements such as wind turbines and HVDC converters. The objective of this work is to find the optimal location for reactive power compensation in weak systems, when the new generation of reactive support alone is not enough. The algorithm is based on exhaustive enumeration optimization method.
{"title":"Optimal reactive power compensation in weak grids with insertion of wind and solar sources","authors":"R. Leborgne, Y. S. Stypulkowski","doi":"10.1109/COBEP.2017.8257362","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257362","url":null,"abstract":"The choice of the best locations for reactive power compensation should be made taking into account the performance of the grid from the point of view of voltage regulation for normal and contingency grid operation, and other parameters such as SCR (Short Circuit Ratio). The elevation of the SCR helps to make the grid less weak, thus improving system performance, which influences the performance of some elements such as wind turbines and HVDC converters. The objective of this work is to find the optimal location for reactive power compensation in weak systems, when the new generation of reactive support alone is not enough. The algorithm is based on exhaustive enumeration optimization method.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131101572","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257302
C. G. D. S. Moraes, R. B. Godoy, G. Luigi
This paper presents a topological change of the power stage and an adaptation of the control method of a three-phase water pump drive supplied by photovoltaic energy. Because it is a product-oriented project, the modifications have proven to be very advantageous since they indicate a considerable reduction in the final cost of the equipment. Such a reduction is mainly due to the use of lower voltage power switches and the removal of high frequency elevating transformers. In addition to the topological improvements, the adaptation of the control method allowed a significant improvement in the reliability and robustness of the system operation, functioning without interruptions due to partial shading and without overvoltage in the DC bus during startups with extreme conditions of irradiation.
{"title":"Adaptions in a three phase water pump drive to improve dynamic control and reduce costs","authors":"C. G. D. S. Moraes, R. B. Godoy, G. Luigi","doi":"10.1109/COBEP.2017.8257302","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257302","url":null,"abstract":"This paper presents a topological change of the power stage and an adaptation of the control method of a three-phase water pump drive supplied by photovoltaic energy. Because it is a product-oriented project, the modifications have proven to be very advantageous since they indicate a considerable reduction in the final cost of the equipment. Such a reduction is mainly due to the use of lower voltage power switches and the removal of high frequency elevating transformers. In addition to the topological improvements, the adaptation of the control method allowed a significant improvement in the reliability and robustness of the system operation, functioning without interruptions due to partial shading and without overvoltage in the DC bus during startups with extreme conditions of irradiation.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130428435","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257266
D. C. Pereira, W. D. de Paula, P. L. Tavares, H. Braga, F. L. Tofoli
This work presents a comparative study comprising the traditional single-stage buck and buck-boost rectifiers used as high-current COB (chip-onboard) LED (light emitting diode) drivers. The structures are designed both in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) in order to analyze the existing stresses in the semiconductors and overall efficiency. For this purpose, a high-current COB LED is used while driven by the aforementioned single-stage non-isolated topologies. The drivers are supposed to present essential features when dealing with outdoor floodlighting e.g. high power factor and low harmonic distortion of the input current. Besides, simulation tests are performed using real intrinsic parasitic parameters of commercially available semiconductors. Finally, the results are properly discussed to evaluate the restrictions of these basic non-isolated high-current COB drivers.
{"title":"Comparative analysis of basic single-stage non-isolated AC-DC topologies employed as high-current COB LED drivers","authors":"D. C. Pereira, W. D. de Paula, P. L. Tavares, H. Braga, F. L. Tofoli","doi":"10.1109/COBEP.2017.8257266","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257266","url":null,"abstract":"This work presents a comparative study comprising the traditional single-stage buck and buck-boost rectifiers used as high-current COB (chip-onboard) LED (light emitting diode) drivers. The structures are designed both in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) in order to analyze the existing stresses in the semiconductors and overall efficiency. For this purpose, a high-current COB LED is used while driven by the aforementioned single-stage non-isolated topologies. The drivers are supposed to present essential features when dealing with outdoor floodlighting e.g. high power factor and low harmonic distortion of the input current. Besides, simulation tests are performed using real intrinsic parasitic parameters of commercially available semiconductors. Finally, the results are properly discussed to evaluate the restrictions of these basic non-isolated high-current COB drivers.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125711963","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257377
Joao Bonifacio, Notker Amann, R. Kennel
The inherent advantages of sensorless control related to reliability, efficiency and costs turn it to be a very interesting technology for automotive applications. Nevertheless, the generation of acoustic noises and current bandwidth limitations due to the injection of HF voltages near zero speed limits its applicability for such high-performance applications. In this work, a newly silent self-sensing strategy, which is achieved through the reduction of the injection frequency, is presented. A novel filtering strategy, based on signal reconstruction, is introduced in order to overcome the bandwidth limitation of the current controller. Moreover, the estimation disturbances in transients are minimized due to the use of a hybrid observer. Experimental results show the effectiveness of the proposed approach.
{"title":"Silent low speed self-sensing strategy for permanent magnet synchronous machines based on subtractive filtering","authors":"Joao Bonifacio, Notker Amann, R. Kennel","doi":"10.1109/COBEP.2017.8257377","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257377","url":null,"abstract":"The inherent advantages of sensorless control related to reliability, efficiency and costs turn it to be a very interesting technology for automotive applications. Nevertheless, the generation of acoustic noises and current bandwidth limitations due to the injection of HF voltages near zero speed limits its applicability for such high-performance applications. In this work, a newly silent self-sensing strategy, which is achieved through the reduction of the injection frequency, is presented. A novel filtering strategy, based on signal reconstruction, is introduced in order to overcome the bandwidth limitation of the current controller. Moreover, the estimation disturbances in transients are minimized due to the use of a hybrid observer. Experimental results show the effectiveness of the proposed approach.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127205644","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257420
R. F. Magossi, P. G. B. Ferreira, M. S. Quinalia, Marina C. Carvalho, R. Machado
The single diode model can be used to modelling a photovoltaic (PV) cell. However, the use of the single diode model to implement a PV emulator can not be practical in case the application requires a high voltage output This happens in consequence of the low threshold voltage of the silicon diode, which means the circuit should be composed by several single diode circuit. Therefore, in this paper, we propose the use of a zener diode to obtain a PV emulator with a high voltage output using fewer devices.
{"title":"Project of a solar module emulator using a zener diode to analyze the behavior of MPPT algorithms","authors":"R. F. Magossi, P. G. B. Ferreira, M. S. Quinalia, Marina C. Carvalho, R. Machado","doi":"10.1109/COBEP.2017.8257420","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257420","url":null,"abstract":"The single diode model can be used to modelling a photovoltaic (PV) cell. However, the use of the single diode model to implement a PV emulator can not be practical in case the application requires a high voltage output This happens in consequence of the low threshold voltage of the silicon diode, which means the circuit should be composed by several single diode circuit. Therefore, in this paper, we propose the use of a zener diode to obtain a PV emulator with a high voltage output using fewer devices.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126367983","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257372
Daniel Martins Lima, V. Montagner, L. Maccari
This paper provides the design of a Model Predictive Controller (MPC) using the Generalized Predictive Control (GPC) algorithm applied to grid-connected inverters with LCL filter. The main objective is to obtain a current controller that ensures reference tracking capacity for sinusoidal references and rejection of specific harmonic disturbances produced by grid voltages. The closed-loop system with the GPC controller is evaluated through time and frequency response analysis.
{"title":"Generalized predictive control with harmonic rejection applied to a grid-connected inverter with LCL filter","authors":"Daniel Martins Lima, V. Montagner, L. Maccari","doi":"10.1109/COBEP.2017.8257372","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257372","url":null,"abstract":"This paper provides the design of a Model Predictive Controller (MPC) using the Generalized Predictive Control (GPC) algorithm applied to grid-connected inverters with LCL filter. The main objective is to obtain a current controller that ensures reference tracking capacity for sinusoidal references and rejection of specific harmonic disturbances produced by grid voltages. The closed-loop system with the GPC controller is evaluated through time and frequency response analysis.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122602846","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257320
A. Bartsch, G. H. Negri, M. S. M. Cavalca, J. de Oliveira, A. Nied
This paper presents a discussion about cost function design procedure for finite control set model predictive control (FCS-MPC) applied to electrical permanent magnet synchronous motor (PMSM) drive. In such analysis, different cost function choices were evaluated, with different type of costs and weighting, in order to achieve the main control objective: minimum torque error, accomplishing the maximum torque per ampere condition. Moreover, this study is completed with discussion on the choice of weighted variables for each objective and its influence in some figures of merit, such as current THD and torque ripple.
{"title":"Cost function tuning methodology for FCS-MPC applied to PMSM drives","authors":"A. Bartsch, G. H. Negri, M. S. M. Cavalca, J. de Oliveira, A. Nied","doi":"10.1109/COBEP.2017.8257320","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257320","url":null,"abstract":"This paper presents a discussion about cost function design procedure for finite control set model predictive control (FCS-MPC) applied to electrical permanent magnet synchronous motor (PMSM) drive. In such analysis, different cost function choices were evaluated, with different type of costs and weighting, in order to achieve the main control objective: minimum torque error, accomplishing the maximum torque per ampere condition. Moreover, this study is completed with discussion on the choice of weighted variables for each objective and its influence in some figures of merit, such as current THD and torque ripple.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125767537","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 : 2017-11-01DOI: 10.1109/COBEP.2017.8257250
Raoni de A. Pegado, R. C. M. Gomes, Luciano F. S. Alves, M. Vitorino, Y. P. M. Rodriguez, A. V. M. L. Filho
The focus of this study is concentrated in the modeling and digital implementation of high-frequency switching devices present in the structure of a static DC-DC converter. Initially they were studied digital simulation techniques for electromagnetic transients, based on methods of numerical integration, for the modeling of basic circuit elements, such as inductors, capacitors and resistors. Then, methods for representing high-frequency switches were studied, which are based on representations of switching states such as inductors and RC-series branches. This type of representation allowed the admittance matrix that represents the system remained constant throughout the simulation, resulting in the reduction of computational effort and consequently on the use of small steps of calculation. The validation of the model was performed by comparing the simulation with the experimental results.
{"title":"High-frequency switch modeling technique applied to DC-DC converters simulation","authors":"Raoni de A. Pegado, R. C. M. Gomes, Luciano F. S. Alves, M. Vitorino, Y. P. M. Rodriguez, A. V. M. L. Filho","doi":"10.1109/COBEP.2017.8257250","DOIUrl":"https://doi.org/10.1109/COBEP.2017.8257250","url":null,"abstract":"The focus of this study is concentrated in the modeling and digital implementation of high-frequency switching devices present in the structure of a static DC-DC converter. Initially they were studied digital simulation techniques for electromagnetic transients, based on methods of numerical integration, for the modeling of basic circuit elements, such as inductors, capacitors and resistors. Then, methods for representing high-frequency switches were studied, which are based on representations of switching states such as inductors and RC-series branches. This type of representation allowed the admittance matrix that represents the system remained constant throughout the simulation, resulting in the reduction of computational effort and consequently on the use of small steps of calculation. The validation of the model was performed by comparing the simulation with the experimental results.","PeriodicalId":375493,"journal":{"name":"2017 Brazilian Power Electronics Conference (COBEP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127685546","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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