Pub Date : 2018-05-01DOI: 10.1109/ICHQP.2018.8378859
Daniel Agudelo-Martinez, Camilo Garzón, A. Pavas
Disturbances interaction at supraharmonic range (2 150 kHz) between two lighting devices and a power source is described in this article by means of an Electrical Power method. Currents and voltages were measured from a LED lamp, a CFL device and an AC Power Source under normal operation in order to describe how conducted disturbances interact within the 2 150 kHz frequency range. From an Electrical Power point of view, the devices used are described as Power-sharing agents and therefore the disturbances observed from their operation can be exchanged not only with their electric neighbourhood, but also throughout the Frequency Domain. This method can be used for the Interaction Description in Frequency Domain of steady-state disturbances between devices without directly considering the impedance behaviour of such devices.
{"title":"Interaction of power quality disturbances within 2–150 kHz (supraharmonics): Analytical framework","authors":"Daniel Agudelo-Martinez, Camilo Garzón, A. Pavas","doi":"10.1109/ICHQP.2018.8378859","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378859","url":null,"abstract":"Disturbances interaction at supraharmonic range (2 150 kHz) between two lighting devices and a power source is described in this article by means of an Electrical Power method. Currents and voltages were measured from a LED lamp, a CFL device and an AC Power Source under normal operation in order to describe how conducted disturbances interact within the 2 150 kHz frequency range. From an Electrical Power point of view, the devices used are described as Power-sharing agents and therefore the disturbances observed from their operation can be exchanged not only with their electric neighbourhood, but also throughout the Frequency Domain. This method can be used for the Interaction Description in Frequency Domain of steady-state disturbances between devices without directly considering the impedance behaviour of such devices.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"539 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85671908","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378866
T. R. Ricciardi, W. Freitas, Fábio K. Taniguchi, Glaucio R. T. Hax, Rafael Moya, G. B. Archilli
The growth of photovoltaic (PV) systems connection into distribution networks is presenting new challenges to distribution utilities. To prepare itself for this new scenario, CPFL Energia has installed 231 PV systems, totalizing 885 kWp, into a same distribution area in Brazil, to serve as a living laboratory for research. During this project, extensive power quality (PQ) measurements were conducted in different transformers and customers. This paper presents the results of this measurement based PQ analysis for this real distribution networks with high PV penetration. The results show that the most significant PQ issues found related with massive PV penetration are, in order, voltage magnitude rise, current harmonic distortion, voltage unbalance and voltage harmonic distortion.
{"title":"Measurement based power quality analysis of real distribution networks with high PV penetration","authors":"T. R. Ricciardi, W. Freitas, Fábio K. Taniguchi, Glaucio R. T. Hax, Rafael Moya, G. B. Archilli","doi":"10.1109/ICHQP.2018.8378866","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378866","url":null,"abstract":"The growth of photovoltaic (PV) systems connection into distribution networks is presenting new challenges to distribution utilities. To prepare itself for this new scenario, CPFL Energia has installed 231 PV systems, totalizing 885 kWp, into a same distribution area in Brazil, to serve as a living laboratory for research. During this project, extensive power quality (PQ) measurements were conducted in different transformers and customers. This paper presents the results of this measurement based PQ analysis for this real distribution networks with high PV penetration. The results show that the most significant PQ issues found related with massive PV penetration are, in order, voltage magnitude rise, current harmonic distortion, voltage unbalance and voltage harmonic distortion.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"62 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86823684","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378835
S. Müller, J. Meyer, J. Myrzik, R. Langella, A. Testa, X. Xu, A. Collin, S. Djokic
This paper is the second part of a two-part series on the development of aggregate frequency domain models (FDMs) of photovoltaic inverters (PVIs). The first-part paper presents measurement-based harmonic fingerprint models (HFMs) of individual PVIs, which require a large number of tests, in order to accurately represent power-dependent changes of PVIs harmonic characteristics. Part 1 paper also presents two suitable modifications of harmonic admittance matrices (HAMs), which allow for accurate representation of PVIs harmonic emission at different operating powers with significantly reduced number of required measurements. This paper evaluates operation of parallel-connected PVI units, investigating whether the correct aggregate HFM can be obtained from their individual HFMs, by summing-up the corresponding HAM elements. The paper compares the results for the aggregate HFMs obtained using individual HFMs from measurement-based and two modified HAM approaches, which are illustrated using an example of two parallel-connected PVIs. The presented HFM-based aggregation approach is specifically aimed for the analysis of networks with a large number of PVIs operating at different powers, as it allows for accurate and computationally efficient determination of their aggregate models and subsequent evaluation of their aggregate impact and effects on the grid and other connected equipment.
{"title":"Aggregate harmonic fingerprint models of PV inverters. Part 2: Operation of parallel-connected units","authors":"S. Müller, J. Meyer, J. Myrzik, R. Langella, A. Testa, X. Xu, A. Collin, S. Djokic","doi":"10.1109/ICHQP.2018.8378835","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378835","url":null,"abstract":"This paper is the second part of a two-part series on the development of aggregate frequency domain models (FDMs) of photovoltaic inverters (PVIs). The first-part paper presents measurement-based harmonic fingerprint models (HFMs) of individual PVIs, which require a large number of tests, in order to accurately represent power-dependent changes of PVIs harmonic characteristics. Part 1 paper also presents two suitable modifications of harmonic admittance matrices (HAMs), which allow for accurate representation of PVIs harmonic emission at different operating powers with significantly reduced number of required measurements. This paper evaluates operation of parallel-connected PVI units, investigating whether the correct aggregate HFM can be obtained from their individual HFMs, by summing-up the corresponding HAM elements. The paper compares the results for the aggregate HFMs obtained using individual HFMs from measurement-based and two modified HAM approaches, which are illustrated using an example of two parallel-connected PVIs. The presented HFM-based aggregation approach is specifically aimed for the analysis of networks with a large number of PVIs operating at different powers, as it allows for accurate and computationally efficient determination of their aggregate models and subsequent evaluation of their aggregate impact and effects on the grid and other connected equipment.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"34 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84222701","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378834
Yu. N. Bulatov, A. Kryukov, K. Suslov
Modern power systems shall meet the requirements of efficiency, survivability, reliability of power supply for consumers. The requirements, which become more rigid under conditions of the competitive power supply market, shall be solved by introduction of Smart Grid technologies. Smart Grid technologies stipulate wide use of distributed generation units. Distributed generation can cause fluctuation of voltage and frequency leading to the flicker noise, which is the visual perception instability. The article presents results of mode modeling of distributed generation units implemented on the basis of synchronous generators. Obtained results show that, when a load in grids with uncontrolled regulators is switched off/on, flicker noise caused by voltage/ frequency fluctuations occurs. Unmatched tuning of excitation/ frequency regulators of distributed generation unit synchronous generators can cause the same effect. Modeling results show that elimination of flicker noise is possible through using matched tuning of these regulators.
{"title":"Solving the flicker noise origin problem by optimally controlled units of distributed generation","authors":"Yu. N. Bulatov, A. Kryukov, K. Suslov","doi":"10.1109/ICHQP.2018.8378834","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378834","url":null,"abstract":"Modern power systems shall meet the requirements of efficiency, survivability, reliability of power supply for consumers. The requirements, which become more rigid under conditions of the competitive power supply market, shall be solved by introduction of Smart Grid technologies. Smart Grid technologies stipulate wide use of distributed generation units. Distributed generation can cause fluctuation of voltage and frequency leading to the flicker noise, which is the visual perception instability. The article presents results of mode modeling of distributed generation units implemented on the basis of synchronous generators. Obtained results show that, when a load in grids with uncontrolled regulators is switched off/on, flicker noise caused by voltage/ frequency fluctuations occurs. Unmatched tuning of excitation/ frequency regulators of distributed generation unit synchronous generators can cause the same effect. Modeling results show that elimination of flicker noise is possible through using matched tuning of these regulators.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"17 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80742630","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378871
A. Bottenberg, C. Debruyne, Brandon Peterson, J. Rens, J. Knockaert, J. Desmet
Resonances in electrical distribution systems can result in amplification of harmonics, which is undesirable in electrical networks. To avoid intrusive measurement techniques, in the majority of the cases network modeling is used to validate if there is an issue with resonance. In this paper a new, innovative but simple, concept is presented which uses relatively basic measurements to segregate the power related to specific harmonics into active and non-active harmonic power. These results are subsequently used in order to find if there is resonance in the electrical network. In this paper the concepts are explained on a theoretical basis and are test cased by numerical modeling. The initial results look promising but additional research is needed to validate the method.
{"title":"Network resonance detection using harmonic active power","authors":"A. Bottenberg, C. Debruyne, Brandon Peterson, J. Rens, J. Knockaert, J. Desmet","doi":"10.1109/ICHQP.2018.8378871","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378871","url":null,"abstract":"Resonances in electrical distribution systems can result in amplification of harmonics, which is undesirable in electrical networks. To avoid intrusive measurement techniques, in the majority of the cases network modeling is used to validate if there is an issue with resonance. In this paper a new, innovative but simple, concept is presented which uses relatively basic measurements to segregate the power related to specific harmonics into active and non-active harmonic power. These results are subsequently used in order to find if there is resonance in the electrical network. In this paper the concepts are explained on a theoretical basis and are test cased by numerical modeling. The initial results look promising but additional research is needed to validate the method.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"43 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77940511","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378915
Zhiyuan Ma, Zhong Xu, W. Mo, Q. Guo, Hai-Jing Wang, K. Zhou, Ying Wang, Liang-Yu Gui
Voltage tolerance curve (VTC) ofsensitive equipment to voltage sag is important for user to apply the mitigation equipment. Test on the equipment is the straight method to get VTC. The accuracy of VTC and the test workload depend on the test method. This paper compares the current five test methods and proposes a new test method for sensitive single-phase equipment. This paper builds a test platform to test the tolerance of a PLC by the six methods, the test results verify the advantage of the proposed method.
{"title":"A new method for sensitive single-phase equipment testing to voltage sag","authors":"Zhiyuan Ma, Zhong Xu, W. Mo, Q. Guo, Hai-Jing Wang, K. Zhou, Ying Wang, Liang-Yu Gui","doi":"10.1109/ICHQP.2018.8378915","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378915","url":null,"abstract":"Voltage tolerance curve (VTC) ofsensitive equipment to voltage sag is important for user to apply the mitigation equipment. Test on the equipment is the straight method to get VTC. The accuracy of VTC and the test workload depend on the test method. This paper compares the current five test methods and proposes a new test method for sensitive single-phase equipment. This paper builds a test platform to test the tolerance of a PLC by the six methods, the test results verify the advantage of the proposed method.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"29 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79666261","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378938
Arthur Piazzi, A. S. Cerqueira, L. R. Manso, C. Duque
Scientific computation is emerging as the central pillar of science. However, loosed research practices and the own nature of the work is leading to a credibility crisis. Reproducible computational research is gaining attraction in the last decades not only because it benefits the validation and attestation of findings, making a more trustworthy publication, but also lowering the barrier of entry, making it more understandable for the target audience and, therefore, increasing its impact. In this article, an online platform where it is possible to store, share and execute linked code and data, from signal processing, applied to electric power quality, is presented. In such manner, this article presents an alternative for researchers in the field to conduct and share their work satisfying the requirements of reproducible research.
{"title":"Reproducible research platform for electric power quality algorithms","authors":"Arthur Piazzi, A. S. Cerqueira, L. R. Manso, C. Duque","doi":"10.1109/ICHQP.2018.8378938","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378938","url":null,"abstract":"Scientific computation is emerging as the central pillar of science. However, loosed research practices and the own nature of the work is leading to a credibility crisis. Reproducible computational research is gaining attraction in the last decades not only because it benefits the validation and attestation of findings, making a more trustworthy publication, but also lowering the barrier of entry, making it more understandable for the target audience and, therefore, increasing its impact. In this article, an online platform where it is possible to store, share and execute linked code and data, from signal processing, applied to electric power quality, is presented. In such manner, this article presents an alternative for researchers in the field to conduct and share their work satisfying the requirements of reproducible research.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"28 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72889048","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378869
T. Busatto, V. Ravindran, A. Larsson, M. Bollen
Harmonic resonances in distribution systems are mainly between network inductances and shunt capacitances from capacitor banks and consumer loads. In this paper, particular attention is devoted to the evaluation of capacitances from domestic equipment, serving as a reference for resonance frequency studies. The assessment is performed by simulation and measurements of common low power electronic loads. From the analysis of EMI filters topologies used in AC/DC converters, a non-invasive capacitance measurement estimation method is presented. The method is verified after correlating capacitances with the resonance frequencies obtained from a frequency sweep method. From experimental measurements, the results show that the equivalent shunt capacitances for a set of 24 LED lamps are between 10 and 135 nF.
{"title":"Estimation of the consumer electronics capacitance for harmonic resonance studies by a non-invasive measurement method","authors":"T. Busatto, V. Ravindran, A. Larsson, M. Bollen","doi":"10.1109/ICHQP.2018.8378869","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378869","url":null,"abstract":"Harmonic resonances in distribution systems are mainly between network inductances and shunt capacitances from capacitor banks and consumer loads. In this paper, particular attention is devoted to the evaluation of capacitances from domestic equipment, serving as a reference for resonance frequency studies. The assessment is performed by simulation and measurements of common low power electronic loads. From the analysis of EMI filters topologies used in AC/DC converters, a non-invasive capacitance measurement estimation method is presented. The method is verified after correlating capacitances with the resonance frequencies obtained from a frequency sweep method. From experimental measurements, the results show that the equivalent shunt capacitances for a set of 24 LED lamps are between 10 and 135 nF.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"39 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85527629","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378833
E. Di Mambro, P. Caramia, P. Varilone, P. Verde
In this paper, we dealt with the problem of the voltage sags due to faults along the lines using the Fault Position Method (FPM). The objective of the study was to demonstrate that for actual transmission systems the FPM can be used in a very effective way to solve real problems with acceptable accuracy and reduced computational times. A very simple procedure for adding further fault positions along the lines, if needed, is proposed. Numerical applications provide evidence of the proposed method. The results obtained were based on a portion of the Italian transmission system and the quantities we used were obtained from the data of the TSO.
{"title":"Voltage sag estimation of real transmission systems for faults along the lines","authors":"E. Di Mambro, P. Caramia, P. Varilone, P. Verde","doi":"10.1109/ICHQP.2018.8378833","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378833","url":null,"abstract":"In this paper, we dealt with the problem of the voltage sags due to faults along the lines using the Fault Position Method (FPM). The objective of the study was to demonstrate that for actual transmission systems the FPM can be used in a very effective way to solve real problems with acceptable accuracy and reduced computational times. A very simple procedure for adding further fault positions along the lines, if needed, is proposed. Numerical applications provide evidence of the proposed method. The results obtained were based on a portion of the Italian transmission system and the quantities we used were obtained from the data of the TSO.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87752468","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 : 2018-05-01DOI: 10.1109/ICHQP.2018.8378855
E. Sosnina, O. Masleeva, R. Bedretdinov, E. Kryukov
Thyristor voltage regulator (TVR) is a 6 kV electrical installation which is being developed by NNSTU. The article is devoted to the study of the electromagnetic field (EMF), created by the TVR operation. The features and the principle of the TVR operation are described. The techniques for estimating the intensity of EMF exposure, developed by the authors, are presented. The dependences of the electric and magnetic field strengths on the voltage and the power of TVR for various calculation points have been obtained. It has been established that the intensity indices of EMF exposure do not exceed permissible norms, and the operation of TTR will not produce a negative impact on the personnel and on the secondary control and protection circuits. The results of the studies will be taken into consideration when choosing a rational arrangement of TVR elements.
{"title":"Research of TVR electromagnetic field","authors":"E. Sosnina, O. Masleeva, R. Bedretdinov, E. Kryukov","doi":"10.1109/ICHQP.2018.8378855","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378855","url":null,"abstract":"Thyristor voltage regulator (TVR) is a 6 kV electrical installation which is being developed by NNSTU. The article is devoted to the study of the electromagnetic field (EMF), created by the TVR operation. The features and the principle of the TVR operation are described. The techniques for estimating the intensity of EMF exposure, developed by the authors, are presented. The dependences of the electric and magnetic field strengths on the voltage and the power of TVR for various calculation points have been obtained. It has been established that the intensity indices of EMF exposure do not exceed permissible norms, and the operation of TTR will not produce a negative impact on the personnel and on the secondary control and protection circuits. The results of the studies will be taken into consideration when choosing a rational arrangement of TVR elements.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"126 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84460165","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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