Pub Date : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511706
A. Loskutov, D. Zyrin, Anna S. Demidova, A. Sevostyanov
The article describes approaches to constructing intellectual Microgrid networks with the sources of distributed generation. The application of a formalized topology of a 6–20 kV distribution network in the form of the hexagonal network is proposed. The principles and algorithms of a post-accident reconfiguration of a hexagonal distribution network are considered. The analysis and classification of flow control devices has been carried out. A method for limiting emergency currents in a Microgrid network of the hexagonal configuration using power flow control devices is proposed. The analysis of various emergency operating modes in the Microgrid network with intellectual devices based on the Solid-State Voltage Regulators from the bus-pulse modulation at the network frequency has been carried out.
{"title":"Microgrids of a Hexagonal Configuration with Solid-State Voltage Regulators","authors":"A. Loskutov, D. Zyrin, Anna S. Demidova, A. Sevostyanov","doi":"10.1109/TDC-LA.2018.8511706","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511706","url":null,"abstract":"The article describes approaches to constructing intellectual Microgrid networks with the sources of distributed generation. The application of a formalized topology of a 6–20 kV distribution network in the form of the hexagonal network is proposed. The principles and algorithms of a post-accident reconfiguration of a hexagonal distribution network are considered. The analysis and classification of flow control devices has been carried out. A method for limiting emergency currents in a Microgrid network of the hexagonal configuration using power flow control devices is proposed. The analysis of various emergency operating modes in the Microgrid network with intellectual devices based on the Solid-State Voltage Regulators from the bus-pulse modulation at the network frequency has been carried out.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126459368","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 : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511737
R. Oliveira, Bibiana P. Ferraz, Ruth Agustini, R. Ferraz, R. Leborgne
This work presents an analysis of clusters between the severity of voltage sags and the fault conditions in a power system. Short circuits are the main causes of voltage sags, which combined with the sensitivity of modern equipment have resulted in significant financial losses due to the significant number of industrial shutdowns. In order to carry out the study, data from voltage sags monitoring in an industrial consumer over seventeen months were evaluated. Equally, the electrical faults historical of the transmission network to which this industry is inserted were utilized in this research. The severity of the events was quantified according to IEEE 1564 standardization, which defines the use of this unique indicator in the voltage sags evaluation. From the simultaneity of these contingencies, a unique dataset was obtained to realize the knowledge discovery through Weka software. Such data mining resulted in the relation between the voltage sags events and those of electrical faults in the power system. Additionally, the most critical points of the system were identified as well as their equipment, which can serve as a basis for vulnerability area analysis and for mitigation solutions to short-term voltage variations in any power system.
{"title":"Clustering Analysis Between Fault Conditions and Voltage Sags Severity: An Industrial Case Study","authors":"R. Oliveira, Bibiana P. Ferraz, Ruth Agustini, R. Ferraz, R. Leborgne","doi":"10.1109/TDC-LA.2018.8511737","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511737","url":null,"abstract":"This work presents an analysis of clusters between the severity of voltage sags and the fault conditions in a power system. Short circuits are the main causes of voltage sags, which combined with the sensitivity of modern equipment have resulted in significant financial losses due to the significant number of industrial shutdowns. In order to carry out the study, data from voltage sags monitoring in an industrial consumer over seventeen months were evaluated. Equally, the electrical faults historical of the transmission network to which this industry is inserted were utilized in this research. The severity of the events was quantified according to IEEE 1564 standardization, which defines the use of this unique indicator in the voltage sags evaluation. From the simultaneity of these contingencies, a unique dataset was obtained to realize the knowledge discovery through Weka software. Such data mining resulted in the relation between the voltage sags events and those of electrical faults in the power system. Additionally, the most critical points of the system were identified as well as their equipment, which can serve as a basis for vulnerability area analysis and for mitigation solutions to short-term voltage variations in any power system.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125836142","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 : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511742
H. Wilhelm, P. Fernandes, L. Feitosa, G. C. dos Santos, C. Galdeano, Daniel Aroucha Filho, Arley Mar, Marcelo Ribeiro, P. J. S. Santos Junior
In this study thermally upgraded kraft paper was degraded in insulating oil in accelerated conditions, at different temperatures. In our aging method the paper was heated from 100 to 400 °C but the mineral insulating oil temperature was maintained below to 60 °C, to avoid oil aging. Dissolved gases were analyzed (DGA) and other cellulose thermal byproducts that result from the process were also determined in order to build a new tool to help diagnose incipient thermal faults involving insulating paper.
{"title":"Thermal Faults Involving Thermally Upgraded Kraft Paper","authors":"H. Wilhelm, P. Fernandes, L. Feitosa, G. C. dos Santos, C. Galdeano, Daniel Aroucha Filho, Arley Mar, Marcelo Ribeiro, P. J. S. Santos Junior","doi":"10.1109/TDC-LA.2018.8511742","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511742","url":null,"abstract":"In this study thermally upgraded kraft paper was degraded in insulating oil in accelerated conditions, at different temperatures. In our aging method the paper was heated from 100 to 400 °C but the mineral insulating oil temperature was maintained below to 60 °C, to avoid oil aging. Dissolved gases were analyzed (DGA) and other cellulose thermal byproducts that result from the process were also determined in order to build a new tool to help diagnose incipient thermal faults involving insulating paper.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125014647","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 : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511687
Raúl C. Bastidas, P. Solis, M. Salinas, M. Vargas
In Peru, the distribution of the payments allocated to the electric generators by the use of the Secondary Transmission Systems (SST) and the Complementary Transmission Systems (SCT) is based on the Use - Electric Distance method. This method was adopted in order to reflect the direction of the power flow produced by each generator in the elements of the transmission system as a result of applying the superposition theorem or superposition principle of electrical circuits. However, the distribution of the payment obtained for some elements of the Peruvian transmission system differs largely from that which would be obtain by applying the superposition principle. This work proposes a distribution alternative based on the use of Generalized Generation Distribution Factors (GGDF) that gets results equal to those obtained applying the superposition theorem.
{"title":"Alternative for Allocate to Generators the Payments for the Use of the Electrical Transmission Systems : Application to the Peruvian Electricity Market","authors":"Raúl C. Bastidas, P. Solis, M. Salinas, M. Vargas","doi":"10.1109/TDC-LA.2018.8511687","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511687","url":null,"abstract":"In Peru, the distribution of the payments allocated to the electric generators by the use of the Secondary Transmission Systems (SST) and the Complementary Transmission Systems (SCT) is based on the Use - Electric Distance method. This method was adopted in order to reflect the direction of the power flow produced by each generator in the elements of the transmission system as a result of applying the superposition theorem or superposition principle of electrical circuits. However, the distribution of the payment obtained for some elements of the Peruvian transmission system differs largely from that which would be obtain by applying the superposition principle. This work proposes a distribution alternative based on the use of Generalized Generation Distribution Factors (GGDF) that gets results equal to those obtained applying the superposition theorem.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126572753","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 : 2018-09-01DOI: 10.1109/tdc-la.2018.8511712
Jaime D. Pinzón, D. G. Colomé
{"title":"Fault-Induced Delayed Voltage Recovery Assessment based on Dynamic Voltage Indices","authors":"Jaime D. Pinzón, D. G. Colomé","doi":"10.1109/tdc-la.2018.8511712","DOIUrl":"https://doi.org/10.1109/tdc-la.2018.8511712","url":null,"abstract":"","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127079694","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 : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511664
Émerson Rafael da Silva, M. S. Ortiz, D. Bernardon, S. P. Viana, Felipe Cechin, W. Hokama
This article highlights the creation of an algorithm that belongs to an automated Active Distribution Management System (ADMS) platform of an electric power system. This developed program is focused on the prevention and verification of errors that can be found in the execution of the power flow algorithm. The creation of test algorithms, applied to ADMS, is justified in the need to automate and optimize the development of the platform, to streamline the testing process and not require human resources to do so. The ADMS platform has the characteristic and similarity of a Supervision Control and Data Acquisition (SCADA) and allows simulations of operation, planning and prevention of contingency situations, from data obtained in the entire electrical system. The ADMS platform is being developed by a Research and Development (R&D) project. The Power Flow Test (PFT) algorithm presented here is the first developed code for testing on the ADMS platform. The entire platform is developed on the web, and the algorithms use JAVA programming.
{"title":"Development of a Power Flow Error Scanning Algorithm in a Platform for Active Distribution Management System","authors":"Émerson Rafael da Silva, M. S. Ortiz, D. Bernardon, S. P. Viana, Felipe Cechin, W. Hokama","doi":"10.1109/TDC-LA.2018.8511664","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511664","url":null,"abstract":"This article highlights the creation of an algorithm that belongs to an automated Active Distribution Management System (ADMS) platform of an electric power system. This developed program is focused on the prevention and verification of errors that can be found in the execution of the power flow algorithm. The creation of test algorithms, applied to ADMS, is justified in the need to automate and optimize the development of the platform, to streamline the testing process and not require human resources to do so. The ADMS platform has the characteristic and similarity of a Supervision Control and Data Acquisition (SCADA) and allows simulations of operation, planning and prevention of contingency situations, from data obtained in the entire electrical system. The ADMS platform is being developed by a Research and Development (R&D) project. The Power Flow Test (PFT) algorithm presented here is the first developed code for testing on the ADMS platform. The entire platform is developed on the web, and the algorithms use JAVA programming.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127822485","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 : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511741
R. Karymov, B. Oleksyuk, I. Shipova, Victor Cioban
In recent years there has been a growing interest in application of 220–500 kV MCSR as line reactors, caused by the need to increase throughput capacity of power lines. When MCSR is connected directly to power line, it should perform all functions of a fixed line reactor, including secondary arc extinction during single-phase auto-reclosing (SPAR) cycles. A feature of MCSR design is the presence of a delta-connected winding, which causes strong electromagnetic coupling between phases of MCSR and increases the secondary arc in-feed current. Therefore, it is of scientific and practical interest to develop measures aimed at limiting the arc current to a level, at which reliable SPAR is ensured, also minimizing recovery voltage and, as a consequence, reducing SPAR dead time. One of the possible solutions is to use a neutral reactor in combination with boosting MCSR reactive power consumption. The paper is dedicated to the development of this approach. Quasi-stationary modes of MCSR with a neutral reactor are considered during SPAR dead time from the point of view of the impact on the secondary arc current. A comparison is made with a traditional solution – fixed line shunt reactor with a neutral reactor, when both solutions provide the same degree of compensation of the arc in-feed current.
{"title":"Sizing of Neutral Reactors for Magnetically Controlled Shunt Reactors Connected Directly to Power Lines","authors":"R. Karymov, B. Oleksyuk, I. Shipova, Victor Cioban","doi":"10.1109/TDC-LA.2018.8511741","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511741","url":null,"abstract":"In recent years there has been a growing interest in application of 220–500 kV MCSR as line reactors, caused by the need to increase throughput capacity of power lines. When MCSR is connected directly to power line, it should perform all functions of a fixed line reactor, including secondary arc extinction during single-phase auto-reclosing (SPAR) cycles. A feature of MCSR design is the presence of a delta-connected winding, which causes strong electromagnetic coupling between phases of MCSR and increases the secondary arc in-feed current. Therefore, it is of scientific and practical interest to develop measures aimed at limiting the arc current to a level, at which reliable SPAR is ensured, also minimizing recovery voltage and, as a consequence, reducing SPAR dead time. One of the possible solutions is to use a neutral reactor in combination with boosting MCSR reactive power consumption. The paper is dedicated to the development of this approach. Quasi-stationary modes of MCSR with a neutral reactor are considered during SPAR dead time from the point of view of the impact on the secondary arc current. A comparison is made with a traditional solution – fixed line shunt reactor with a neutral reactor, when both solutions provide the same degree of compensation of the arc in-feed current.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"15 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114032283","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 : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511692
Jean-Michel Clairand, André Pazmiño-Arias, Thalía Játiva-Maldonado, C. Álvarez-Bel
Massive introduction of electric vehicles (EVs) present several benefits for the environment, but they create new challenges for electricity utilities, such as the management of the EV charging to avoid grid problems. Thus, several researchers propose the inclusion of the Electric Vehicle Aggregator in distribution and transmission systems. This paper discusses a Remote Control designed for the EV Aggregator end users. It is composed of an electronic device, which is installed in the different slow charging stations (residential or commercial), which enables to turn remotely on/off the charging or to modulate charging power rate. It is also composed of a visual interface, designed for EV Aggregator end users, which will interact with the different EV charging of an area depending on electricity market and load conditions.
{"title":"A Remote Control of Electric Vehicle Aggregator for Managing the Charging Power","authors":"Jean-Michel Clairand, André Pazmiño-Arias, Thalía Játiva-Maldonado, C. Álvarez-Bel","doi":"10.1109/TDC-LA.2018.8511692","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511692","url":null,"abstract":"Massive introduction of electric vehicles (EVs) present several benefits for the environment, but they create new challenges for electricity utilities, such as the management of the EV charging to avoid grid problems. Thus, several researchers propose the inclusion of the Electric Vehicle Aggregator in distribution and transmission systems. This paper discusses a Remote Control designed for the EV Aggregator end users. It is composed of an electronic device, which is installed in the different slow charging stations (residential or commercial), which enables to turn remotely on/off the charging or to modulate charging power rate. It is also composed of a visual interface, designed for EV Aggregator end users, which will interact with the different EV charging of an area depending on electricity market and load conditions.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122559866","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 : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511794
Mateo A. Cortés, Orlando A. González, Elkin Moreno Soto, Carlos A. Cusgüen, E. Mojica-Nava, A. Pavas
This paper presents the formation of non-monetary incentives for social systems, which may appropriately complement the traditional use of financial incentives. Social incentives are modeled using opinion dynamics. The proposed incentives can be used in diverse systems, and we present an application to electric energy demand response programs, where consumers, represented as a stochastic bottom-up consumption model, have an initial opinion reflecting their degree of acceptance of a certain demand response program. With the application of social incentives via opinion dynamics, consumers have a final opinion with a potential of up to 22% in power reduction and 20% in average energy savings due to demand response strategies.
{"title":"Opinion Dynamics and Social Incentives Applied to Demand Response Programs","authors":"Mateo A. Cortés, Orlando A. González, Elkin Moreno Soto, Carlos A. Cusgüen, E. Mojica-Nava, A. Pavas","doi":"10.1109/TDC-LA.2018.8511794","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511794","url":null,"abstract":"This paper presents the formation of non-monetary incentives for social systems, which may appropriately complement the traditional use of financial incentives. Social incentives are modeled using opinion dynamics. The proposed incentives can be used in diverse systems, and we present an application to electric energy demand response programs, where consumers, represented as a stochastic bottom-up consumption model, have an initial opinion reflecting their degree of acceptance of a certain demand response program. With the application of social incentives via opinion dynamics, consumers have a final opinion with a potential of up to 22% in power reduction and 20% in average energy savings due to demand response strategies.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122939935","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 : 2018-09-01DOI: 10.1109/TDC-LA.2018.8511781
Adrieli Ruviaro, M. Sperandio, Priscila Ebert, M. A. Boaski, Junior Felipe Mallmann
This article presents a series of studies that are being carried out at the Federal University of Santa Maria (UFSM), located in the center of southern state of Brazil, in order to reduce electric energy costs and improve supply quality. The main objective is to disseminate the various actions that can be taken to improve the quality and reliability of any distribution system, such as reconfiguration of networks, energy efficiency strategies, deployment of distributed generation in the microgrid.
{"title":"Energy Efficiency Studies in a Brazilian University Campus","authors":"Adrieli Ruviaro, M. Sperandio, Priscila Ebert, M. A. Boaski, Junior Felipe Mallmann","doi":"10.1109/TDC-LA.2018.8511781","DOIUrl":"https://doi.org/10.1109/TDC-LA.2018.8511781","url":null,"abstract":"This article presents a series of studies that are being carried out at the Federal University of Santa Maria (UFSM), located in the center of southern state of Brazil, in order to reduce electric energy costs and improve supply quality. The main objective is to disseminate the various actions that can be taken to improve the quality and reliability of any distribution system, such as reconfiguration of networks, energy efficiency strategies, deployment of distributed generation in the microgrid.","PeriodicalId":267301,"journal":{"name":"2018 IEEE PES Transmission & Distribution Conference and Exhibition - Latin America (T&D-LA)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127991701","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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