Pub Date : 2012-11-01DOI: 10.1109/INDUSCON.2012.6451563
L. Encarnação, M. Aredes
Recently, problems related to poor energy quality, which in the last decade were responsible only for annoying situations and small losses in low voltage systems, are now causing damage to equipments and high financial losses to industries in medium voltage systems. The recent necessity of a better energy quality encourages the development of new specific custom power equipments directly connected in medium voltage systems. Therefore, several solutions were applied in order to enable the connection of custom power equipments in the medium voltage system, like as step down transformers and series connected semiconductors. However, it is well know that the multilevel converters are perfectly capable to work directly in the medium voltage systems and also presents several advantages when compared with others solutions. Although, some topologies, like the asymmetric cascaded multilevel converter, presents difficulties in regulating all the separated dc-link capacitors. In this context, this article presents a multilevel D-STATCOM with a proposed dc-link regulation control loop for generic cascaded multilevel converters to work directly in the medium voltage systems in order to improve the power quality in industrial installations. The performance of the multilevel D-STATCOM is presented by simulation and experimental results.
{"title":"DC-link regulation of a multilevel asymmetric cascaded D-STATCOM with staircase and discontinuous PWM modulation","authors":"L. Encarnação, M. Aredes","doi":"10.1109/INDUSCON.2012.6451563","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6451563","url":null,"abstract":"Recently, problems related to poor energy quality, which in the last decade were responsible only for annoying situations and small losses in low voltage systems, are now causing damage to equipments and high financial losses to industries in medium voltage systems. The recent necessity of a better energy quality encourages the development of new specific custom power equipments directly connected in medium voltage systems. Therefore, several solutions were applied in order to enable the connection of custom power equipments in the medium voltage system, like as step down transformers and series connected semiconductors. However, it is well know that the multilevel converters are perfectly capable to work directly in the medium voltage systems and also presents several advantages when compared with others solutions. Although, some topologies, like the asymmetric cascaded multilevel converter, presents difficulties in regulating all the separated dc-link capacitors. In this context, this article presents a multilevel D-STATCOM with a proposed dc-link regulation control loop for generic cascaded multilevel converters to work directly in the medium voltage systems in order to improve the power quality in industrial installations. The performance of the multilevel D-STATCOM is presented by simulation and experimental results.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115061880","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6451393
A. Carneiro, A. Pasquali, M. E. R. Romero, E. M. Martins, R. Santos, J. M. Silva Filho, E. Miyamoto, L. da Costa
This paper presents an integrated system for automatic diagnostic on power transformers (SIDAT) of substations. SIDAT performs diagnosis based on several kinds of tests such as thermography images, chromatography, physical-chemical, and electrical. SIDAT also performs prognostic indicating the time life of the equipment. The inference engine for diagnostic is based on rules of the maintenance department of the company and it has been designed as a set Mealy Finite State Machines (FSMs). The system has been tested and evaluated with data coming from a production environment and stores data of 157 power transformers (13.8kVA and 34.5kVA) located in 94 different substations.
{"title":"SIDAT - integrated system for automatic diagnostic on power transformers","authors":"A. Carneiro, A. Pasquali, M. E. R. Romero, E. M. Martins, R. Santos, J. M. Silva Filho, E. Miyamoto, L. da Costa","doi":"10.1109/INDUSCON.2012.6451393","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6451393","url":null,"abstract":"This paper presents an integrated system for automatic diagnostic on power transformers (SIDAT) of substations. SIDAT performs diagnosis based on several kinds of tests such as thermography images, chromatography, physical-chemical, and electrical. SIDAT also performs prognostic indicating the time life of the equipment. The inference engine for diagnostic is based on rules of the maintenance department of the company and it has been designed as a set Mealy Finite State Machines (FSMs). The system has been tested and evaluated with data coming from a production environment and stores data of 157 power transformers (13.8kVA and 34.5kVA) located in 94 different substations.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126026620","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6453851
D. Oliveira, M. Batista, L. Barreto, P. Praça
This paper proposes a single-phase bidirectional ac-dc converter feasible to dc distributed power systems. The topology provides galvanic isolation and is able to protect the system during short-circuits occurrence in the load side. The power factor control in the ac side is performed by the duty cycle variation in the primary bridge. It is supposed to regulate the dc bus voltage even during voltage dips and short-circuits. The secondary side bridge is driven with constant duty cycle and the power flow is controlled by the variation of the phase shift angle between the two bridges. The basic equations are shown and the simulation results are presented and discussed.
{"title":"A bidirectional single stage AC-DC converter with high frequency isolation feasible to DC distributed power systems","authors":"D. Oliveira, M. Batista, L. Barreto, P. Praça","doi":"10.1109/INDUSCON.2012.6453851","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6453851","url":null,"abstract":"This paper proposes a single-phase bidirectional ac-dc converter feasible to dc distributed power systems. The topology provides galvanic isolation and is able to protect the system during short-circuits occurrence in the load side. The power factor control in the ac side is performed by the duty cycle variation in the primary bridge. It is supposed to regulate the dc bus voltage even during voltage dips and short-circuits. The secondary side bridge is driven with constant duty cycle and the power flow is controlled by the variation of the phase shift angle between the two bridges. The basic equations are shown and the simulation results are presented and discussed.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125942263","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6452830
R. D. de Oliveira Reiter, L. Michels, J. R. Pinheiro, S. Oliveira, A. Péres
This paper presents the implementation of a digital phase-lead plus resonant controller for photovoltaic (PV) applications using delta operator in a low-cost 16 bit fixed-point controller. The resonant controller is used to reduce the low frequency voltage ripple across the PV array in a step-up dc-dc converter for grid-connected PV applications. Delta operator is proposed to solve problems related to imprecise parameters representation in conventional shift operator implementation. Simulation and experimental results using shift and delta operators are presented to demonstrate the advantages of delta implementation form.
{"title":"Fixed-point implementation of phase lead + resonant controllers for PV applications","authors":"R. D. de Oliveira Reiter, L. Michels, J. R. Pinheiro, S. Oliveira, A. Péres","doi":"10.1109/INDUSCON.2012.6452830","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6452830","url":null,"abstract":"This paper presents the implementation of a digital phase-lead plus resonant controller for photovoltaic (PV) applications using delta operator in a low-cost 16 bit fixed-point controller. The resonant controller is used to reduce the low frequency voltage ripple across the PV array in a step-up dc-dc converter for grid-connected PV applications. Delta operator is proposed to solve problems related to imprecise parameters representation in conventional shift operator implementation. Simulation and experimental results using shift and delta operators are presented to demonstrate the advantages of delta implementation form.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"85 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127983903","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6452136
F. Batista, M. T. Peraça, C. Petry
This paper presents the development of a low power photovoltaic system for energy supplying for small loads in emergency situations. The system consists of three power converters that work to charge batteries, boost voltages and provide an alternating signal to the load. The factors considered in the selection of each converter, their main characteristics and design equations are presented. The major contribution of the proposed system is its simplicity and reduced size and weight. Experimental results show the stand-alone operation of each converter and a prototype for the complete system.
{"title":"Low power photovoltaic system for energy supplying for small loads","authors":"F. Batista, M. T. Peraça, C. Petry","doi":"10.1109/INDUSCON.2012.6452136","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6452136","url":null,"abstract":"This paper presents the development of a low power photovoltaic system for energy supplying for small loads in emergency situations. The system consists of three power converters that work to charge batteries, boost voltages and provide an alternating signal to the load. The factors considered in the selection of each converter, their main characteristics and design equations are presented. The major contribution of the proposed system is its simplicity and reduced size and weight. Experimental results show the stand-alone operation of each converter and a prototype for the complete system.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126639922","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6453746
R. G. A. Cacau, R. Bascopé, J. L. Junior, G. Bascope
This paper presents a single-stage high power factor AC-DC converter based on modified Push-Pull employing three-state switching cell. The topology of the three-state switching cell provides lower current stresses in the switches, since only half the input power is processed by the active switches. Thus, only half the input peak current flows through the switches, reducing conduction and switching losses, hence making the use of this converter very attractive for applications in larger power levels. The volume and weight of magnetic elements is reduced, since they operate at a twice the switching frequency of switches. A theoretical analysis and design example of the proposed converter as well as experimental results for a 1.5kW prototype are presented in this work.
{"title":"A modified Push-Pull pre-regulator based on three-state switching cell","authors":"R. G. A. Cacau, R. Bascopé, J. L. Junior, G. Bascope","doi":"10.1109/INDUSCON.2012.6453746","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6453746","url":null,"abstract":"This paper presents a single-stage high power factor AC-DC converter based on modified Push-Pull employing three-state switching cell. The topology of the three-state switching cell provides lower current stresses in the switches, since only half the input power is processed by the active switches. Thus, only half the input peak current flows through the switches, reducing conduction and switching losses, hence making the use of this converter very attractive for applications in larger power levels. The volume and weight of magnetic elements is reduced, since they operate at a twice the switching frequency of switches. A theoretical analysis and design example of the proposed converter as well as experimental results for a 1.5kW prototype are presented in this work.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126493486","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6452563
R. A. Ferreira, Henrique A. C. Braga, André Augusto Ferreira, Pedro G. Barbosa
This work presents a performance study of a dc microgrid when it is used a voltage droop technique to regulated the grid voltage and to control the load sharing between different sources. A small model of a dc microgrid comprising microsources and loads was implemented in the Simulink/Matlab environment. Some aspects about centralized (master-slave) and descentralized (voltage droop) control strategies as well as the procedures to design the controllers, with and without droop control, are presented and discussed. Simulation results obtained with the digital model of the dc microgrid with three microsources will be presented to validate the effectiveness of the voltage droop strategy, applied to proportional and proportional-integral controllers, to regulate the microgrid voltage.
{"title":"Analysis of voltage droop control method for dc microgrids with Simulink: Modelling and simulation","authors":"R. A. Ferreira, Henrique A. C. Braga, André Augusto Ferreira, Pedro G. Barbosa","doi":"10.1109/INDUSCON.2012.6452563","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6452563","url":null,"abstract":"This work presents a performance study of a dc microgrid when it is used a voltage droop technique to regulated the grid voltage and to control the load sharing between different sources. A small model of a dc microgrid comprising microsources and loads was implemented in the Simulink/Matlab environment. Some aspects about centralized (master-slave) and descentralized (voltage droop) control strategies as well as the procedures to design the controllers, with and without droop control, are presented and discussed. Simulation results obtained with the digital model of the dc microgrid with three microsources will be presented to validate the effectiveness of the voltage droop strategy, applied to proportional and proportional-integral controllers, to regulate the microgrid voltage.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130095015","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6453445
F. H. Dupont, C. Rech, J. R. Pinheiro
This paper analyzes the solar radiation profile of some Brazilian cities and shows a methodology to obtain the equations for the calculation of the weighted average efficiency, aiming to allow efficiency maximization designs for the electrical energy processing in photovoltaic systems. By means of data obtained in climatic stations that are members of the National Organization of Environmental Data System (SONDA) network, of the National Institute of Spatial Research (INPE), the electrical generation capacity of these stations is shown, and is verified that 70% of the processed energy lies in the range of 25% to 50 % of the nominal power of converter modules. The analysis presented in this paper has a major importance for the optimized design of power converters, and shows a strong dependence of the site location for the energy generation system.
{"title":"A methodology to obtain the equations for the calculation of the weighted average efficiency applied to photovoltaic systems","authors":"F. H. Dupont, C. Rech, J. R. Pinheiro","doi":"10.1109/INDUSCON.2012.6453445","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6453445","url":null,"abstract":"This paper analyzes the solar radiation profile of some Brazilian cities and shows a methodology to obtain the equations for the calculation of the weighted average efficiency, aiming to allow efficiency maximization designs for the electrical energy processing in photovoltaic systems. By means of data obtained in climatic stations that are members of the National Organization of Environmental Data System (SONDA) network, of the National Institute of Spatial Research (INPE), the electrical generation capacity of these stations is shown, and is verified that 70% of the processed energy lies in the range of 25% to 50 % of the nominal power of converter modules. The analysis presented in this paper has a major importance for the optimized design of power converters, and shows a strong dependence of the site location for the energy generation system.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130612746","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6451399
C. C. A. de Melo, C. Kayser, J. L. Salles, V. B. de Oliveira
Many industrial plants use regulatory control loops to achieve a stable operation of its processes and ensure that their products meet minimum quality parameters required by their customers. Moreover, the transformation processes of the raw materials into finished products can involve complex organization of equipment and energy use of different types (for example, electrical, chemical, mechanical, thermal, etc.). In this context, a major effort is undertaken by companies so that your plants are operated efficiently. But for that to happen it is essential that regulatory control is working properly. The evaluation of the regulatory control can be made periodically by means of indicators, so that corrective actions can be taken when significant performance degradation thereof occurs. Considering these issues, it was decided to conduct a pilot project to analyze the benefits that the regulatory control evaluation could bring to a company of the steel industry. The pilot project was conducted in a steam power plant belonging to the company. The approach of the methodology employed, the main items checked and the results achieved in this project are part of the scope of this text.
{"title":"Regulatory control evaluation and improvement in a steam power plant","authors":"C. C. A. de Melo, C. Kayser, J. L. Salles, V. B. de Oliveira","doi":"10.1109/INDUSCON.2012.6451399","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6451399","url":null,"abstract":"Many industrial plants use regulatory control loops to achieve a stable operation of its processes and ensure that their products meet minimum quality parameters required by their customers. Moreover, the transformation processes of the raw materials into finished products can involve complex organization of equipment and energy use of different types (for example, electrical, chemical, mechanical, thermal, etc.). In this context, a major effort is undertaken by companies so that your plants are operated efficiently. But for that to happen it is essential that regulatory control is working properly. The evaluation of the regulatory control can be made periodically by means of indicators, so that corrective actions can be taken when significant performance degradation thereof occurs. Considering these issues, it was decided to conduct a pilot project to analyze the benefits that the regulatory control evaluation could bring to a company of the steel industry. The pilot project was conducted in a steam power plant belonging to the company. The approach of the methodology employed, the main items checked and the results achieved in this project are part of the scope of this text.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"1 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131840319","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 : 2012-11-01DOI: 10.1109/INDUSCON.2012.6451420
N. Will, R. Cardoso
This paper presents a numerical comparison between the FFT and the Kalman filter applied for harmonic components detection in different situation of the grid operation. Some pitfalls of the FFT are showed and the results are compared with the Kalman filter approach. It is considered signals with step changes in amplitude, frequency and phase. An analysis of these results is made demonstrating the better behavior of the Kalman filter approach in comparison to the FFT.
{"title":"Comparative analysis between FFT and Kalman filter approaches for harmonic components detection","authors":"N. Will, R. Cardoso","doi":"10.1109/INDUSCON.2012.6451420","DOIUrl":"https://doi.org/10.1109/INDUSCON.2012.6451420","url":null,"abstract":"This paper presents a numerical comparison between the FFT and the Kalman filter applied for harmonic components detection in different situation of the grid operation. Some pitfalls of the FFT are showed and the results are compared with the Kalman filter approach. It is considered signals with step changes in amplitude, frequency and phase. An analysis of these results is made demonstrating the better behavior of the Kalman filter approach in comparison to the FFT.","PeriodicalId":442317,"journal":{"name":"2012 10th IEEE/IAS International Conference on Industry Applications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128509713","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：