Pub Date : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571858
Miguel Pozuelo Monfort, Sergio López Oña, D. Ribó-Pérez, S. Djokic
This paper discusses modelling of photovoltaic pumping system (PVPS) applications and presents a simple but accurate model for the evaluation of performance of a large-scale multi-pump off-grid PVPS’, with single axis solar tracking and variable frequency drive control of pumps. The presented model is validated on an example of an actual 357 kWp 2-pump PVPS installation, demonstrating its use for feasibility and planning studies. The results of a brief economic analysis of the considered off-grid PVPS suggest an estimated 10-year payback period, when compared to the cost of a grid-connected configuration.
{"title":"Modelling and Evaluating Performance of Large Off-Grid PV Systems for Water Pumping","authors":"Miguel Pozuelo Monfort, Sergio López Oña, D. Ribó-Pérez, S. Djokic","doi":"10.1109/ISGTEurope.2018.8571858","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571858","url":null,"abstract":"This paper discusses modelling of photovoltaic pumping system (PVPS) applications and presents a simple but accurate model for the evaluation of performance of a large-scale multi-pump off-grid PVPS’, with single axis solar tracking and variable frequency drive control of pumps. The presented model is validated on an example of an actual 357 kWp 2-pump PVPS installation, demonstrating its use for feasibility and planning studies. The results of a brief economic analysis of the considered off-grid PVPS suggest an estimated 10-year payback period, when compared to the cost of a grid-connected configuration.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129106670","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571786
S. Eberlein, A. Heider, K. Rudion
This work investigates the power sharing of distributed energy resources, such as diesel synchronous generators and inverter-coupled batteries, in islanded microgrids after load transients. Firstly, the necessary accuracy of the diesel synchronous generator model for dynamic simulation and small signal stability studies is examined. Secondly, the controller parameters are optimized deploying a genetic algorithm to enhance the transient load sharing between synchronous generators and battery inverters.
{"title":"Modelling and Control Optimization of Diesel Synchronous Generators in LV Microgrids","authors":"S. Eberlein, A. Heider, K. Rudion","doi":"10.1109/ISGTEurope.2018.8571786","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571786","url":null,"abstract":"This work investigates the power sharing of distributed energy resources, such as diesel synchronous generators and inverter-coupled batteries, in islanded microgrids after load transients. Firstly, the necessary accuracy of the diesel synchronous generator model for dynamic simulation and small signal stability studies is examined. Secondly, the controller parameters are optimized deploying a genetic algorithm to enhance the transient load sharing between synchronous generators and battery inverters.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129133620","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571518
James G. Wright, S. Wolthusen
IEC61850 and IEC62351 combined provide a set of security promises for the communications channels that are used to run a substation automation system (SAS), that use IEC61850 based technologies. However, one area that is largely untouched by these security promises is the generic object oriented substation events (GOOSE) messaging service. GOOSE is designed to multicast commands and data across a substation within hard real time quality of service (QoS) requirements. This means that GOOSE is unable to implement the required security technologies as the added latency to any message would violate the QoS.
{"title":"Stealthy Injection Attacks Against IEC61850's GOOSE Messaging Service","authors":"James G. Wright, S. Wolthusen","doi":"10.1109/ISGTEurope.2018.8571518","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571518","url":null,"abstract":"IEC61850 and IEC62351 combined provide a set of security promises for the communications channels that are used to run a substation automation system (SAS), that use IEC61850 based technologies. However, one area that is largely untouched by these security promises is the generic object oriented substation events (GOOSE) messaging service. GOOSE is designed to multicast commands and data across a substation within hard real time quality of service (QoS) requirements. This means that GOOSE is unable to implement the required security technologies as the added latency to any message would violate the QoS.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127335029","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571798
A. Rigas, G. Messinis, N. Hatziargyriou
Battery Energy Storage Systems (BESS) distributed over the Low Voltage (LV) network have been proposed as means of providing ancillary services in active distribution grids. Hence, optimal planning of BESS places and sizes is important so as to ensure economic and technical viability of such solutions. Most of the existing approaches for the optimal planning rely on previous knowledge of the network topology which, especially in low voltage networks, may not be available in practice. The paper assumes knowledge of P, Q, V measurements from smart meters placed in network leaf nodes only. At first, a topology identification algorithm is applied in order to estimate the network topology. Next, an algorithm for optimal sizing of BESS is applied on both the identified and original networks in order to assess the impact of topology identification potential errors in the planning procedure. Finally, the proposed algorithm is demonstrated on characteristic network cases.
{"title":"Application of Topology Identification on Optimal BESS Sizing in Distribution Systems","authors":"A. Rigas, G. Messinis, N. Hatziargyriou","doi":"10.1109/ISGTEurope.2018.8571798","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571798","url":null,"abstract":"Battery Energy Storage Systems (BESS) distributed over the Low Voltage (LV) network have been proposed as means of providing ancillary services in active distribution grids. Hence, optimal planning of BESS places and sizes is important so as to ensure economic and technical viability of such solutions. Most of the existing approaches for the optimal planning rely on previous knowledge of the network topology which, especially in low voltage networks, may not be available in practice. The paper assumes knowledge of P, Q, V measurements from smart meters placed in network leaf nodes only. At first, a topology identification algorithm is applied in order to estimate the network topology. Next, an algorithm for optimal sizing of BESS is applied on both the identified and original networks in order to assess the impact of topology identification potential errors in the planning procedure. Finally, the proposed algorithm is demonstrated on characteristic network cases.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134000455","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571612
Toni Tukia, Semen Uimonen, M. Lehtonen
Displacement of conventional generation with inverter-fed renewable generation hampers power system stability due to a decrease in rotating masses and spinning reserves. This reduction in inertial response capability requires more advanced power system design and innovations in frequency control technology and related power system balancing markets. This paper investigates the potential of applying vertical transportation devices to provide the system with virtual inertia to maintain the frequency quality. The study focuses on the Nordic power system and considers the demand response from both elevators and escalators. The results indicate that vertical transportation is able to contribute to the frequency support with little impact on the aggregate travel time of passengers. However, the capability is limited during the most likely periods of low system inertia, which, in the Nordic power system, occur during summer nights.
{"title":"Assessing the Applicability of Vertical Transportation in Power System Inertial Support","authors":"Toni Tukia, Semen Uimonen, M. Lehtonen","doi":"10.1109/ISGTEurope.2018.8571612","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571612","url":null,"abstract":"Displacement of conventional generation with inverter-fed renewable generation hampers power system stability due to a decrease in rotating masses and spinning reserves. This reduction in inertial response capability requires more advanced power system design and innovations in frequency control technology and related power system balancing markets. This paper investigates the potential of applying vertical transportation devices to provide the system with virtual inertia to maintain the frequency quality. The study focuses on the Nordic power system and considers the demand response from both elevators and escalators. The results indicate that vertical transportation is able to contribute to the frequency support with little impact on the aggregate travel time of passengers. However, the capability is limited during the most likely periods of low system inertia, which, in the Nordic power system, occur during summer nights.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116684916","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571485
S. Cunha, C. Borges, Pedro S. Simon, Julio A. S. Dias
This paper presents a sensitivity analysis on the reliability of a hydroelectric plant with reservoir with respect to its storage capacity level. The comparison is made in probabilistic terms, using the sequential Monte Carlo simulation, which takes into account equipment failures, hydrological inflow scenarios and a load curve. The reliability evaluation was carried out for a generation system composed of just one hydro power plant supplying its respective load, considering five hypotheses of its storage capacity. In addition to the traditional reliability indices, it was also computed a reliability indicator, denoted by P95, which can be used as the “capacity value” to be issued to the hydro plant for commercial purposes. The analysis of the resulting annual reliability indexes shows the impact of reducing the storage capacity not only on the plant's “firm energy” but also on its capacity value attribute. Moreover, for all storage levels considered, the monthly values of P95 presented significant seasonal variation, which further confirms the importance of storage capacity or “regulating capacity” to ensure system reliability all over the year.
{"title":"Probabilistic Capacity Value of a Hydroelectric Plant for Different Storage Capacity Levels","authors":"S. Cunha, C. Borges, Pedro S. Simon, Julio A. S. Dias","doi":"10.1109/ISGTEurope.2018.8571485","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571485","url":null,"abstract":"This paper presents a sensitivity analysis on the reliability of a hydroelectric plant with reservoir with respect to its storage capacity level. The comparison is made in probabilistic terms, using the sequential Monte Carlo simulation, which takes into account equipment failures, hydrological inflow scenarios and a load curve. The reliability evaluation was carried out for a generation system composed of just one hydro power plant supplying its respective load, considering five hypotheses of its storage capacity. In addition to the traditional reliability indices, it was also computed a reliability indicator, denoted by P95, which can be used as the “capacity value” to be issued to the hydro plant for commercial purposes. The analysis of the resulting annual reliability indexes shows the impact of reducing the storage capacity not only on the plant's “firm energy” but also on its capacity value attribute. Moreover, for all storage levels considered, the monthly values of P95 presented significant seasonal variation, which further confirms the importance of storage capacity or “regulating capacity” to ensure system reliability all over the year.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130996351","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571695
Katja Sirviö, Lasse Valkkila, H. Laaksonen, K. Kauhaniemi, A. Rajala
New options to provide the technical ancillary services locally and system-wide by distributed energy resources (DER) are needed in the future. Sundom Smart Grid (SSG), local smart grid pilot in Vaasa, offers a novel research platform to develop protection and control solutions for future distribution networks. In this study, an ancillary service solution for reactive power management was studied by utilizing measured data and available MV and LV network connected DER units. Different requirements for reactive power flow between distribution and transmission network were considered in the studies. Based on these requirements “Future Reactive Power Window” was formulated for SSG. The reactive power flow across voltage levels in different cases was studied by simulations. Simulations showed that a coordinated reactive power management scheme across different voltage levels is very important from the technical and the economical point of view for development of future distribution networks.
{"title":"Prospects and Costs for Reactive Power Control in Sundom Smart Grid","authors":"Katja Sirviö, Lasse Valkkila, H. Laaksonen, K. Kauhaniemi, A. Rajala","doi":"10.1109/ISGTEurope.2018.8571695","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571695","url":null,"abstract":"New options to provide the technical ancillary services locally and system-wide by distributed energy resources (DER) are needed in the future. Sundom Smart Grid (SSG), local smart grid pilot in Vaasa, offers a novel research platform to develop protection and control solutions for future distribution networks. In this study, an ancillary service solution for reactive power management was studied by utilizing measured data and available MV and LV network connected DER units. Different requirements for reactive power flow between distribution and transmission network were considered in the studies. Based on these requirements “Future Reactive Power Window” was formulated for SSG. The reactive power flow across voltage levels in different cases was studied by simulations. Simulations showed that a coordinated reactive power management scheme across different voltage levels is very important from the technical and the economical point of view for development of future distribution networks.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132778650","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571437
Kazuaki Iwamura, Kohei Nishiyama, Ryo Kobayashi, Y. Nakanishi
An integrated method for large-scale introduction of wind farms with the associated extension of the transmission grid and connection to existing access points was investigated. Simultaneous planning is needed as the location of the wind farm plays a key role in the cost of transmission network construction, and vice versa. A common geospatial platform was introduced. Candidate wind farm locations with suitable wind speeds and topographical features were selected, taking account of the minimum power capacity required. Transmission network extensions were then mapped, to provide connections to existing access points. Optimization of wind farm siting and transmission network topology was demonstrated.
{"title":"A Combined Geospatial Approach to Extension Planning of Wind Farms and Transmission Networks","authors":"Kazuaki Iwamura, Kohei Nishiyama, Ryo Kobayashi, Y. Nakanishi","doi":"10.1109/ISGTEurope.2018.8571437","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571437","url":null,"abstract":"An integrated method for large-scale introduction of wind farms with the associated extension of the transmission grid and connection to existing access points was investigated. Simultaneous planning is needed as the location of the wind farm plays a key role in the cost of transmission network construction, and vice versa. A common geospatial platform was introduced. Candidate wind farm locations with suitable wind speeds and topographical features were selected, taking account of the minimum power capacity required. Transmission network extensions were then mapped, to provide connections to existing access points. Optimization of wind farm siting and transmission network topology was demonstrated.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132868140","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571791
Ozge Okur, R. Brouwer, P. Bots, Fredrik Troost
The increase in variable renewable energy sources requires more flexibility in the power system. This could be provided by small distributed energy sources located at end-users. Aggregators can potentially exploit this flexibility by providing Primary Control Reserve (PCR) services to the Transmission System Operator, and congestion management services to Distribution System Operators. A simulation model based on Linear Programming is used to assess, for a case study in the Netherlands, whether such congestion management services are efficient. The results show that an aggregator can reduce the total system costs with 10–15% relative to traditional grid reinforcements, depending on price and depreciation of batteries, PCR remuneration, and wholesale electricity price.
{"title":"Aggregated Flexibility to Support Congestion Management","authors":"Ozge Okur, R. Brouwer, P. Bots, Fredrik Troost","doi":"10.1109/ISGTEurope.2018.8571791","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571791","url":null,"abstract":"The increase in variable renewable energy sources requires more flexibility in the power system. This could be provided by small distributed energy sources located at end-users. Aggregators can potentially exploit this flexibility by providing Primary Control Reserve (PCR) services to the Transmission System Operator, and congestion management services to Distribution System Operators. A simulation model based on Linear Programming is used to assess, for a case study in the Netherlands, whether such congestion management services are efficient. The results show that an aggregator can reduce the total system costs with 10–15% relative to traditional grid reinforcements, depending on price and depreciation of batteries, PCR remuneration, and wholesale electricity price.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131967819","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 : 2018-10-01DOI: 10.1109/ISGTEurope.2018.8571429
F. Sanchez, F. Gonzalez-Longatt, J. Rueda, P. Palensky
The growth of vehicle electrification is driven by the desire to reduce environmental pollution, and it is fueled by advancements in battery technology. If left unmanaged, electric vehicle (EV) charging will increase peak demand and put a strain on the electricity networks. However, if properly managed, EVs can provide useful services to the power system operator such as fast active-power injection which serves to improve the system frequency response (SFR) after a disturbance. The objective of this paper is to assess the impact that clusters of EVs, connected to frequency-responsive charging stations, have on the provision of SFR after a loss of generation event. The assessment considers EV charging demand in Great Britain (GB) for the year 2025 considering three different daily charging patterns. A generic model for the EV clusters is developed which includes the effects of measurement delays and control charger time response. The model and scenarios are integrated into a single-area model representative of the GB power system and the minimum expected values for the system's inertia in the year 2025 are used. The results obtained highlight the benefits on the SFR of utilizing EVs as a dynamic energy storage system for different types of charging and the impact of the measurement delay on the dynamics of the response.
{"title":"Impact of Electric Vehicle Charging Control on the Frequency Response: Study of the GB System","authors":"F. Sanchez, F. Gonzalez-Longatt, J. Rueda, P. Palensky","doi":"10.1109/ISGTEurope.2018.8571429","DOIUrl":"https://doi.org/10.1109/ISGTEurope.2018.8571429","url":null,"abstract":"The growth of vehicle electrification is driven by the desire to reduce environmental pollution, and it is fueled by advancements in battery technology. If left unmanaged, electric vehicle (EV) charging will increase peak demand and put a strain on the electricity networks. However, if properly managed, EVs can provide useful services to the power system operator such as fast active-power injection which serves to improve the system frequency response (SFR) after a disturbance. The objective of this paper is to assess the impact that clusters of EVs, connected to frequency-responsive charging stations, have on the provision of SFR after a loss of generation event. The assessment considers EV charging demand in Great Britain (GB) for the year 2025 considering three different daily charging patterns. A generic model for the EV clusters is developed which includes the effects of measurement delays and control charger time response. The model and scenarios are integrated into a single-area model representative of the GB power system and the minimum expected values for the system's inertia in the year 2025 are used. The results obtained highlight the benefits on the SFR of utilizing EVs as a dynamic energy storage system for different types of charging and the impact of the measurement delay on the dynamics of the response.","PeriodicalId":302863,"journal":{"name":"2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132256658","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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