Pub Date : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381141
L. H. M. Leite, W. Boaventura, Luciano de Errico, Eduardo Nohme Cardoso, R. Dutra, Bruno Marciano Lopes
When connected to the power distribution grid, Distributed Generation Photovoltaic (DGPV) systems not only contribute to supply the load demand, but can also assist the grid performance by means of several ancillary services, notably in voltage support after a voltage drop. Main current grid codes and international standards require DGPV units to remain connected even in the event of severe voltage sag. In order to minimize the impacts on the distribution grid, the photovoltaic sources can be used to inject reactive power. This paper discusses the main aspects related to voltage support using DGPV sources and proposes a voltage control architecture, considering the contribution of each DGPV unit and using a distributed communication infrastructure.
{"title":"Fault ride through capability and voltage support in distribution grid with photovoltaic distributed generation","authors":"L. H. M. Leite, W. Boaventura, Luciano de Errico, Eduardo Nohme Cardoso, R. Dutra, Bruno Marciano Lopes","doi":"10.1109/ISGT-LA.2015.7381141","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381141","url":null,"abstract":"When connected to the power distribution grid, Distributed Generation Photovoltaic (DGPV) systems not only contribute to supply the load demand, but can also assist the grid performance by means of several ancillary services, notably in voltage support after a voltage drop. Main current grid codes and international standards require DGPV units to remain connected even in the event of severe voltage sag. In order to minimize the impacts on the distribution grid, the photovoltaic sources can be used to inject reactive power. This paper discusses the main aspects related to voltage support using DGPV sources and proposes a voltage control architecture, considering the contribution of each DGPV unit and using a distributed communication infrastructure.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128471819","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381244
G. Aristoy, Sebastian Isaurralde, E. Font, Á. Giusto
This article studies an algorithm for state estimation in electric power networks, adding information from phasor measurement units (PMU) to the classical SCADA data. This work describes the implementation in MatLab of one of the algorithms found in the literature and the migration of the code to C++ in order to test its time performance. The algorithm was tested on the 39 bus IEEE case study. A good tracking of the waveforms was achieved even in cases of three phase short-circuits or drastic load changes. Execution times obtained in C++ in regular desk computers where short enough to predict a suitable real time performance.
{"title":"Power network state estimation algorithms and their use with synchrophasors","authors":"G. Aristoy, Sebastian Isaurralde, E. Font, Á. Giusto","doi":"10.1109/ISGT-LA.2015.7381244","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381244","url":null,"abstract":"This article studies an algorithm for state estimation in electric power networks, adding information from phasor measurement units (PMU) to the classical SCADA data. This work describes the implementation in MatLab of one of the algorithms found in the literature and the migration of the code to C++ in order to test its time performance. The algorithm was tested on the 39 bus IEEE case study. A good tracking of the waveforms was achieved even in cases of three phase short-circuits or drastic load changes. Execution times obtained in C++ in regular desk computers where short enough to predict a suitable real time performance.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128479444","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381197
M. Sandoval, S. Grijalva
The electric power landscape is undergoing a profound change driven by a confluence of environmental concerns, economic forces, regulatory trends and significant advances in technology. The traditional electricity business model has been characterized by a centralized architecture where utilities deliver power from centrally coordinated generators and receive revenue based on volume of energy sales. The introduction of distributed generation and storage allows traditional consumers to not only consume, but also to produce, or store energy. The active participation of these so called “prosumers” transforms the traditional electricity business model and allows them to participate in the value chain by offering new services. However, how these capabilities should be valued and integrated into the overall system operation is unclear. There is a need for cost-benefit frameworks that provide stakeholders the insight they need to make informed investment decisions. This paper presents a prosumer-based, cost-benefit and business model innovation framework for valuation of distributed energy resources. The valuation framework is based on a decentralized, layered, architecture and multisided platform that continuously connects a network of prosumers and describes the value exchange among energy service providers and customers in business areas that will include not only traditional energy generation and delivery, but other related products and valued added services enabled by new technologies. The business innovation framework expands the prosumer-centered approach and includes grid objectives of ultra-reliability, economic optimization and sustainability. If properly implemented, the framework would provide electric utilities, energy service providers and prosumers the foundation to evaluate the net benefits of Distributed Energy Resources and how to maximize them.
{"title":"Future grid business model innovation: A prosumer-based cost-benefit framework for valuation of Distributed Energy Resources","authors":"M. Sandoval, S. Grijalva","doi":"10.1109/ISGT-LA.2015.7381197","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381197","url":null,"abstract":"The electric power landscape is undergoing a profound change driven by a confluence of environmental concerns, economic forces, regulatory trends and significant advances in technology. The traditional electricity business model has been characterized by a centralized architecture where utilities deliver power from centrally coordinated generators and receive revenue based on volume of energy sales. The introduction of distributed generation and storage allows traditional consumers to not only consume, but also to produce, or store energy. The active participation of these so called “prosumers” transforms the traditional electricity business model and allows them to participate in the value chain by offering new services. However, how these capabilities should be valued and integrated into the overall system operation is unclear. There is a need for cost-benefit frameworks that provide stakeholders the insight they need to make informed investment decisions. This paper presents a prosumer-based, cost-benefit and business model innovation framework for valuation of distributed energy resources. The valuation framework is based on a decentralized, layered, architecture and multisided platform that continuously connects a network of prosumers and describes the value exchange among energy service providers and customers in business areas that will include not only traditional energy generation and delivery, but other related products and valued added services enabled by new technologies. The business innovation framework expands the prosumer-centered approach and includes grid objectives of ultra-reliability, economic optimization and sustainability. If properly implemented, the framework would provide electric utilities, energy service providers and prosumers the foundation to evaluate the net benefits of Distributed Energy Resources and how to maximize them.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127489080","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381180
Rodrigo Borges Biancini, Flavio A. Becon Lemos, V. Brusamarello, Gutter da Rodda
In this paper is presented an investigation on use of piercing type connectors to make the connection between the distribution transformer output cables and overhead multiplexed lines of LV (380/220V) distribution network. The proposed test is based on NBR9326 standard related to the wedge type connectors, since there is not recommendation associated to piercing type connectors. A theoretical analysis is presented to assist the creation of thermal and electric models, which are used in the simulation studies. In order to execute the laboratory tests, NBR-9326 standard recommendations were adapted. To illustrate the paper, simulations and laboratory test results are presented.
{"title":"Ensaio de conectores tipo perfurante para conexao entre transformador e rede secundaria multiplexada","authors":"Rodrigo Borges Biancini, Flavio A. Becon Lemos, V. Brusamarello, Gutter da Rodda","doi":"10.1109/ISGT-LA.2015.7381180","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381180","url":null,"abstract":"In this paper is presented an investigation on use of piercing type connectors to make the connection between the distribution transformer output cables and overhead multiplexed lines of LV (380/220V) distribution network. The proposed test is based on NBR9326 standard related to the wedge type connectors, since there is not recommendation associated to piercing type connectors. A theoretical analysis is presented to assist the creation of thermal and electric models, which are used in the simulation studies. In order to execute the laboratory tests, NBR-9326 standard recommendations were adapted. To illustrate the paper, simulations and laboratory test results are presented.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128812281","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381249
R. Alonso, S. Solari, S. Correa, Agustin Lopez de Lacalle, F. Pedocchi, L. Teixeira
Marine energy is an untapped resource, which could make a significant contribution to the renewable and clean energy generation matrix. Amongst the marine sources, wave energy is the most promising one in a microtidal and template zone like the Uruguayan oceanic coast. In this article the performance of a flap-type wave energy converter was analyzed in the basis of an analytical model and spectra wave hindcast data at a specific location of the Uruguayan coast. The results of our study allowed us to estimate the amount of energy that may be harvest for this particular site and device.
{"title":"Performance of a flap-type wave energy converter on the Uruguayan Atlantic coast","authors":"R. Alonso, S. Solari, S. Correa, Agustin Lopez de Lacalle, F. Pedocchi, L. Teixeira","doi":"10.1109/ISGT-LA.2015.7381249","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381249","url":null,"abstract":"Marine energy is an untapped resource, which could make a significant contribution to the renewable and clean energy generation matrix. Amongst the marine sources, wave energy is the most promising one in a microtidal and template zone like the Uruguayan oceanic coast. In this article the performance of a flap-type wave energy converter was analyzed in the basis of an analytical model and spectra wave hindcast data at a specific location of the Uruguayan coast. The results of our study allowed us to estimate the amount of energy that may be harvest for this particular site and device.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126360085","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381187
Enrique Briglia, Sebastian Alaggia, F. Paganini
Uncertainties in distributed generation with renewable sources, and load fluctuations due to demand response, require the Distribution System Operator to have tools to coordinate supply and demand with an adequate quality of service. A cost optimization method is proposed for this purpose, based on two time-scales: a slow scale were topology changes and transformer taps are varied with their operation costs, and a fast time-scale based on an optimal power flow, in which costs of power supply and quality of service are incorporated. To solve the latter we rely on convex relaxations to the DistFlow model, which allow an efficient solution in radial topologies. We also develop a detailed model in DistFlow of wind and photovoltaic generators operating as subnets of the Distribution network. The method is demonstrated with data from a real network in Uruguay.
{"title":"Economic operation of distribution networks with distributed generation and quality of service","authors":"Enrique Briglia, Sebastian Alaggia, F. Paganini","doi":"10.1109/ISGT-LA.2015.7381187","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381187","url":null,"abstract":"Uncertainties in distributed generation with renewable sources, and load fluctuations due to demand response, require the Distribution System Operator to have tools to coordinate supply and demand with an adequate quality of service. A cost optimization method is proposed for this purpose, based on two time-scales: a slow scale were topology changes and transformer taps are varied with their operation costs, and a fast time-scale based on an optimal power flow, in which costs of power supply and quality of service are incorporated. To solve the latter we rely on convex relaxations to the DistFlow model, which allow an efficient solution in radial topologies. We also develop a detailed model in DistFlow of wind and photovoltaic generators operating as subnets of the Distribution network. The method is demonstrated with data from a real network in Uruguay.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126553196","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381245
G. Borges, F. Romero, Leonardo H. T. Ferreira Neto, Joao Castilho Neto, A. Meffe, A. Antunes, Leonardo F. de Moura, Alberico A. P. da Silva
The distribution system is the final connection between the power system and consumers. If the load shedding is necessary to ensure that operating restrictions, usually this load shedding will occur in the distribution system. This paper analyzes the load shedding in medium voltage performed in the event of reduced availability of the supply system (generation and / or transmission) that may occur due to contingencies or power rationing. For this, we propose a new methodology developed for load shedding (transfer and / or cutting loads) that is based on the methodology called Multi-objective Evolutionary Algorithm based on subpopulations tables. This algorithm which makes use of node-depth for representing distribution systems without computationally simplifications and was originally developed to address the problem of network reconfiguration, with respect to analytical losses and restoring power distribution systems. Despite the ability of this algorithm based on analyzing the unique issues for which it was designed, it does not parse the load shedding problems in distribution systems.
{"title":"Use of genetic algorithm for evaluation and control of technical problems due load shedding in power systems","authors":"G. Borges, F. Romero, Leonardo H. T. Ferreira Neto, Joao Castilho Neto, A. Meffe, A. Antunes, Leonardo F. de Moura, Alberico A. P. da Silva","doi":"10.1109/ISGT-LA.2015.7381245","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381245","url":null,"abstract":"The distribution system is the final connection between the power system and consumers. If the load shedding is necessary to ensure that operating restrictions, usually this load shedding will occur in the distribution system. This paper analyzes the load shedding in medium voltage performed in the event of reduced availability of the supply system (generation and / or transmission) that may occur due to contingencies or power rationing. For this, we propose a new methodology developed for load shedding (transfer and / or cutting loads) that is based on the methodology called Multi-objective Evolutionary Algorithm based on subpopulations tables. This algorithm which makes use of node-depth for representing distribution systems without computationally simplifications and was originally developed to address the problem of network reconfiguration, with respect to analytical losses and restoring power distribution systems. Despite the ability of this algorithm based on analyzing the unique issues for which it was designed, it does not parse the load shedding problems in distribution systems.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126282793","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381271
Andres D. Quevedo, E. G. Suarez, Sandra M. Arias, F. Santamaria, J. A. Alarcón
This paper presents a study case to improve Energy Efficiency (EE) in a residential building under two considerations: introducing a new load to the system corresponding to the charging of Plug-in Electric Vehicles (PEV), and proposing an action plan based on the modernization of technological devices. Initially, the simulation of the electric system is performed to calculate variables such as voltage, power demand and losses for different PEV penetration scenarios. After that, EE indicators required to assess each scenario are evaluated and individual and collective plans are proposed. Finally, plans are evaluated with respect to their contribution on EE improvement.
{"title":"Assessment of Energy Efficiency indicators on a residential building with Plug-in Electric Vehicles and energy action plans for users","authors":"Andres D. Quevedo, E. G. Suarez, Sandra M. Arias, F. Santamaria, J. A. Alarcón","doi":"10.1109/ISGT-LA.2015.7381271","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381271","url":null,"abstract":"This paper presents a study case to improve Energy Efficiency (EE) in a residential building under two considerations: introducing a new load to the system corresponding to the charging of Plug-in Electric Vehicles (PEV), and proposing an action plan based on the modernization of technological devices. Initially, the simulation of the electric system is performed to calculate variables such as voltage, power demand and losses for different PEV penetration scenarios. After that, EE indicators required to assess each scenario are evaluated and individual and collective plans are proposed. Finally, plans are evaluated with respect to their contribution on EE improvement.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131496861","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381247
M. Vignolo, Lucas Narbondo, J. Cataldo, Federico González Madina
In this paper, the feasibility of installing wind power microgeneration in Montevideo urban environments in a self-producing regime is studied. To do this, a characterization of the demand curves of different areas is carried out, data from several wind turbines is collected and the energy produced, the energy replaced and the corresponding savings in electricity bills are simulated. The proposed methodology allows for the identification of cases of location, type of consumer, tariff and the type of wind turbines for which it is feasible to consider installing wind power microgeneration.
{"title":"Feasibility studies for the instalation of wind microgeneration in urban areas in Montevideo","authors":"M. Vignolo, Lucas Narbondo, J. Cataldo, Federico González Madina","doi":"10.1109/ISGT-LA.2015.7381247","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381247","url":null,"abstract":"In this paper, the feasibility of installing wind power microgeneration in Montevideo urban environments in a self-producing regime is studied. To do this, a characterization of the demand curves of different areas is carried out, data from several wind turbines is collected and the energy produced, the energy replaced and the corresponding savings in electricity bills are simulated. The proposed methodology allows for the identification of cases of location, type of consumer, tariff and the type of wind turbines for which it is feasible to consider installing wind power microgeneration.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133268503","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 : 2015-10-01DOI: 10.1109/ISGT-LA.2015.7381162
C. Porrini, Alejandro Gutiérrez, G. Cazes Boezio, Gonzalo Hermida, Diego Oroño, Martin Puppo
In this work, an operational solar energy forecast model was developed based in correction of irradatiation obtained from WRF output. This output depends on the Hourly Clearness Index (kt). Three different physic schemes of WRF parametrization are analyzed in this work. The horizontal irradiation computed by Weather Research and Forecasting (WRF) is the input of the developed Model Output Statistic (MOS). Solar irradiation is converted from horizontal to tilted surface, and a final photo-voltaic solar energy plant coefficient is calibrated to obtain the minimal absolute error in the period of calibration.
{"title":"Development of a Model Output Statistic and implementation of an operational solar photovoltaic energy forecast model based in WRF","authors":"C. Porrini, Alejandro Gutiérrez, G. Cazes Boezio, Gonzalo Hermida, Diego Oroño, Martin Puppo","doi":"10.1109/ISGT-LA.2015.7381162","DOIUrl":"https://doi.org/10.1109/ISGT-LA.2015.7381162","url":null,"abstract":"In this work, an operational solar energy forecast model was developed based in correction of irradatiation obtained from WRF output. This output depends on the Hourly Clearness Index (kt). Three different physic schemes of WRF parametrization are analyzed in this work. The horizontal irradiation computed by Weather Research and Forecasting (WRF) is the input of the developed Model Output Statistic (MOS). Solar irradiation is converted from horizontal to tilted surface, and a final photo-voltaic solar energy plant coefficient is calibrated to obtain the minimal absolute error in the period of calibration.","PeriodicalId":345318,"journal":{"name":"2015 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131926472","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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