Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647202
Jorge Fernandez Daher
New competitive electrical markets impose improvement in service performance. Therefore, it has become of upmost importance the early detection of incipient faults or defects in all involved equipment. Maintenance costs can be reduced by using monitoring systems to change from periodic maintenance practices to condition based maintenance. Also, manufacturers find in remote monitoring systems a good possibility for the analysis of the behaviour of equipment that could never be done in the past. Therefore, they can use this information as a differential in present demanding markets increasing warranty periods. During the last three years, our company has been doing research and development of monitoring systems. With all the gathered information, it is possible to assess the equipment condition in a wiser way.
{"title":"Substation monitoring systems for asset management, development and analysis of results","authors":"Jorge Fernandez Daher","doi":"10.1109/urucon53396.2021.9647202","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647202","url":null,"abstract":"New competitive electrical markets impose improvement in service performance. Therefore, it has become of upmost importance the early detection of incipient faults or defects in all involved equipment. Maintenance costs can be reduced by using monitoring systems to change from periodic maintenance practices to condition based maintenance. Also, manufacturers find in remote monitoring systems a good possibility for the analysis of the behaviour of equipment that could never be done in the past. Therefore, they can use this information as a differential in present demanding markets increasing warranty periods. During the last three years, our company has been doing research and development of monitoring systems. With all the gathered information, it is possible to assess the equipment condition in a wiser way.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122028527","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647329
{"title":"Special Session: Equipo ganador de la Hackaton Big Bang 2021 [Not available in English]","authors":"","doi":"10.1109/urucon53396.2021.9647329","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647329","url":null,"abstract":"","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127791001","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647088
J. Colqui, L. Timaná, P. Torrez, Sérgio Kurokawa
The Folded Line Equivalent (FLE) is a transmission line model that decomposes the nodal admittance matrix of the transmission line into an open-circuit admittance matrix and a short-circuit admittance matrix. The resulting admittance matrices are then fitted to rational functions and associated with equivalent electrical circuits. Technical literature suggests that the FLE can be implemented in EMTP-like software, but no paper had proposed a method to implement it in the ATP-EMTP. This paper proposes a new representation of the FLE, which can be implemented in the ATP-EMTP. We propose to use an orthonormal matrix instead of the matrix proposed by the authors of the FLE. The proposed approach can represent short lines in simulations with time steps greater or equal to the propagation time of the transmission line. We compare the results obtained with the proposed approach to the JMarti model and the Universal Line Model. Results show that the proposed approach is accurate and is less sensitive to the time step used in the simulations.
{"title":"Partial Implementation of the Folded Line Equivalent Transmission Line Model in the ATP version of the Electromagnetic Transients Program","authors":"J. Colqui, L. Timaná, P. Torrez, Sérgio Kurokawa","doi":"10.1109/urucon53396.2021.9647088","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647088","url":null,"abstract":"The Folded Line Equivalent (FLE) is a transmission line model that decomposes the nodal admittance matrix of the transmission line into an open-circuit admittance matrix and a short-circuit admittance matrix. The resulting admittance matrices are then fitted to rational functions and associated with equivalent electrical circuits. Technical literature suggests that the FLE can be implemented in EMTP-like software, but no paper had proposed a method to implement it in the ATP-EMTP. This paper proposes a new representation of the FLE, which can be implemented in the ATP-EMTP. We propose to use an orthonormal matrix instead of the matrix proposed by the authors of the FLE. The proposed approach can represent short lines in simulations with time steps greater or equal to the propagation time of the transmission line. We compare the results obtained with the proposed approach to the JMarti model and the Universal Line Model. Results show that the proposed approach is accurate and is less sensitive to the time step used in the simulations.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123136419","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647190
Nubia Palacios-Quecan, Camilo Perez-Ospino, S. Cancino-Suarez
Cerebrovascular accidents (stroke) can cause neurological problems, transient or permanent disability, and even death. In cases where disability is present, it is useful to be able to obtain specific information about the damage caused to the brain. One way to quantify the specific characteristics of the damage caused by stroke is to perform a three-dimensional reconstruction. It is for this reason that this paper proposes a method to carry out this procedure. Initially, the process used is based on automatic segmentation of the lesion in each of the images or slices that are part of the brain Magnetic Resonance (MR) sequence. The segmented regions are used together for lesion volume reconstruction. This volume is displayed on an interface, along with its location within the skull, and its specific characteristics. The results obtained comprise an interface showing data of interest about the lesion and its reconstruction. Also, in the lesion segmentation process, a favorable Dice-Sorense coefficient index of 0.75 is obtained with respect to the images annotated by experts. The lesion characteristics estimated in the implemented interface, such as location and volume, have an error of less than 30% with respect to the annotations of the database used, showing that the information provided by the proposed method is quite useful for the specialist's understanding of the brain damage caused by the stroke.
{"title":"3D Reconstruction of Damage Caused by a Stroke using Magnetic Resonance Imaging Processing","authors":"Nubia Palacios-Quecan, Camilo Perez-Ospino, S. Cancino-Suarez","doi":"10.1109/urucon53396.2021.9647190","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647190","url":null,"abstract":"Cerebrovascular accidents (stroke) can cause neurological problems, transient or permanent disability, and even death. In cases where disability is present, it is useful to be able to obtain specific information about the damage caused to the brain. One way to quantify the specific characteristics of the damage caused by stroke is to perform a three-dimensional reconstruction. It is for this reason that this paper proposes a method to carry out this procedure. Initially, the process used is based on automatic segmentation of the lesion in each of the images or slices that are part of the brain Magnetic Resonance (MR) sequence. The segmented regions are used together for lesion volume reconstruction. This volume is displayed on an interface, along with its location within the skull, and its specific characteristics. The results obtained comprise an interface showing data of interest about the lesion and its reconstruction. Also, in the lesion segmentation process, a favorable Dice-Sorense coefficient index of 0.75 is obtained with respect to the images annotated by experts. The lesion characteristics estimated in the implemented interface, such as location and volume, have an error of less than 30% with respect to the annotations of the database used, showing that the information provided by the proposed method is quite useful for the specialist's understanding of the brain damage caused by the stroke.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130846641","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647047
Mateus F. Girardi, J. Leite
In this paper, it is analyzed two algorithms to calculate the three-phase power flow in electricity distribution networks. The algorithm should be able to present an effective convergence to unbalanced networks spending reduced processing time. The computational analysis assumes the steady state and the behavior of the components present in the electricity distribution network, such as buses with distributed generation and controlled voltage. The performance of the power flow solution is analyzed using one sweep method, called backward/forward sweep power flow that admittedly can maintain a high speed of execution necessary to real-time applications in automation tools of the distribution system. Another solution method is a current injection algorithm based on the Gauss' method using the nodal impedance matrix of the distribution networks to solve the state variables including the voltage profiles in buses and the current flows in lines. The tests are performed through the computational implementation of these two power flow solution algorithms by evaluating comparatively the results obtained from the electrical quantities of the distribution network plus the computational cost.
{"title":"Performance Analysis of Three-Phase Power Flow Algorithms in Power Distribution Networks","authors":"Mateus F. Girardi, J. Leite","doi":"10.1109/urucon53396.2021.9647047","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647047","url":null,"abstract":"In this paper, it is analyzed two algorithms to calculate the three-phase power flow in electricity distribution networks. The algorithm should be able to present an effective convergence to unbalanced networks spending reduced processing time. The computational analysis assumes the steady state and the behavior of the components present in the electricity distribution network, such as buses with distributed generation and controlled voltage. The performance of the power flow solution is analyzed using one sweep method, called backward/forward sweep power flow that admittedly can maintain a high speed of execution necessary to real-time applications in automation tools of the distribution system. Another solution method is a current injection algorithm based on the Gauss' method using the nodal impedance matrix of the distribution networks to solve the state variables including the voltage profiles in buses and the current flows in lines. The tests are performed through the computational implementation of these two power flow solution algorithms by evaluating comparatively the results obtained from the electrical quantities of the distribution network plus the computational cost.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131006561","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647212
M. T. Andrade
The study of grounding installations requires an adequate knowledge of the terrain. Generally, four-point methods are used to get the data: Wenner or Schlumberger. In this job, the terrain is modeled as two horizontal layers. An analysis of the interpretation of soil measurements in the IEEE 80 and 81 standards is the basis of this study. To the parametric resistivity curves provided by standard 80, for the Wenner method, the place for which the apparent resistivity is equal to the mean value of the resistivity of both layers is added. The result of this study consists of a new and simple equation that allows to determine the depth of the first layer. So, for the determination of this parameter, the graphical analysis is no longer necessary. This procedure is extended to the best-known proposal of Palmer method in the same way.
{"title":"A new simplified method for soil modeling in two horizontal layers","authors":"M. T. Andrade","doi":"10.1109/urucon53396.2021.9647212","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647212","url":null,"abstract":"The study of grounding installations requires an adequate knowledge of the terrain. Generally, four-point methods are used to get the data: Wenner or Schlumberger. In this job, the terrain is modeled as two horizontal layers. An analysis of the interpretation of soil measurements in the IEEE 80 and 81 standards is the basis of this study. To the parametric resistivity curves provided by standard 80, for the Wenner method, the place for which the apparent resistivity is equal to the mean value of the resistivity of both layers is added. The result of this study consists of a new and simple equation that allows to determine the depth of the first layer. So, for the determination of this parameter, the graphical analysis is no longer necessary. This procedure is extended to the best-known proposal of Palmer method in the same way.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134356420","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647124
G. Belcredi, L. Aspirot, P. Monzón, P. Belzarena
This paper models a large-scale Internet of Things (IoT) network as a stochastic system that offloads computing towards Fog and Cloud via a shared access medium. The analysis of this large IoT system by stochastic methods is a challenging problem, if possible, to solve. This paper proposes the approximation of the dynamic of the IoT network via the fluid limit of the stochastic process. This method allows the analysis of the large-scale system and also allows finding the equilibrium point of the system. The results obtained with stochastic simulations show that the fluid model is an excellent approximation of the stochastic system.
{"title":"Large-Scale IoT Network Offloading to Cloud and Fog Computing: a Fluid Limit Model","authors":"G. Belcredi, L. Aspirot, P. Monzón, P. Belzarena","doi":"10.1109/urucon53396.2021.9647124","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647124","url":null,"abstract":"This paper models a large-scale Internet of Things (IoT) network as a stochastic system that offloads computing towards Fog and Cloud via a shared access medium. The analysis of this large IoT system by stochastic methods is a challenging problem, if possible, to solve. This paper proposes the approximation of the dynamic of the IoT network via the fluid limit of the stochastic process. This method allows the analysis of the large-scale system and also allows finding the equilibrium point of the system. The results obtained with stochastic simulations show that the fluid model is an excellent approximation of the stochastic system.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116565609","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647135
{"title":"Special Session: Battery Storage Technologies & Their Potential Applications in the Power Systems","authors":"","doi":"10.1109/urucon53396.2021.9647135","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647135","url":null,"abstract":"","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124913779","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647244
Luis A. Paredes, Marcelo G. Molina, B. Serrano
When the transition from the microgrid (MG) to its island operating mode occurs due to resilient contingencies, the dynamic voltage stability (DVS) is severely compromised. The static var compensator (SVC) device with FACTS (flexible ac transmission systems) technology allows mitigating and improving dynamic voltage instability scenarios due to its fast and efficient reactive power compensation. The SVC optimal location in the MG allows improving the dynamic performance of the voltage. To achieve these aims, an optimization algorithm that considers dynamic simulations in the time domain carried out in Power Factory DIgSilent is proposed through this paper. When voltage signals are discretized vs. time signals, those indices that quantitatively evaluate the dynamic performance of the voltage are calculated. With these metrics, the objective function of the optimization algorithm is formulated with a mixed-integer linear programming model (MILP) that is solved using Python–Pyomo. The results obtained are satisfactory and demonstrated that the optimal location of the SVC in isolated MG considerably improves DVS and, consequently, the operational resilience.
{"title":"Optimal Location of an SVC in a Microgrid to Improve the Dynamic Voltage Stability","authors":"Luis A. Paredes, Marcelo G. Molina, B. Serrano","doi":"10.1109/urucon53396.2021.9647244","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647244","url":null,"abstract":"When the transition from the microgrid (MG) to its island operating mode occurs due to resilient contingencies, the dynamic voltage stability (DVS) is severely compromised. The static var compensator (SVC) device with FACTS (flexible ac transmission systems) technology allows mitigating and improving dynamic voltage instability scenarios due to its fast and efficient reactive power compensation. The SVC optimal location in the MG allows improving the dynamic performance of the voltage. To achieve these aims, an optimization algorithm that considers dynamic simulations in the time domain carried out in Power Factory DIgSilent is proposed through this paper. When voltage signals are discretized vs. time signals, those indices that quantitatively evaluate the dynamic performance of the voltage are calculated. With these metrics, the objective function of the optimization algorithm is formulated with a mixed-integer linear programming model (MILP) that is solved using Python–Pyomo. The results obtained are satisfactory and demonstrated that the optimal location of the SVC in isolated MG considerably improves DVS and, consequently, the operational resilience.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127423758","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 : 2021-11-24DOI: 10.1109/urucon53396.2021.9647391
Lalit Reddy Muthyala, S. Chilukuri, Meghana Anumula
This paper presents an annular ring Metasurface (MTS) Patch antenna with multi band characteristics. The geometry of the antenna is $0.42lambda_{0}times 0.42lambda_{0}times 0.02lambda_{0}$ (where $lambda_{0}$ is the lower resonating frequency i.e.2.42GHz). An aperture coupling through CPW is used to feed the uniform MTS radiating structure to resonate at multiple frequencies 2.42GHz, 2.86GHz, 6.3GHz, 6.94GHz and 7.96GHz. It is observed to have a good bandwidth and higher gain values at the targeted frequencies with the maximum gain of 9.81dB and thus used in WLAN, C band applications like weather radar systems and satellite communications
{"title":"A CPW Fed Metasurface MultiBand Antenna with Aperture Coupling: A CPW Fed Multi Band Antenna","authors":"Lalit Reddy Muthyala, S. Chilukuri, Meghana Anumula","doi":"10.1109/urucon53396.2021.9647391","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647391","url":null,"abstract":"This paper presents an annular ring Metasurface (MTS) Patch antenna with multi band characteristics. The geometry of the antenna is $0.42lambda_{0}times 0.42lambda_{0}times 0.02lambda_{0}$ (where $lambda_{0}$ is the lower resonating frequency i.e.2.42GHz). An aperture coupling through CPW is used to feed the uniform MTS radiating structure to resonate at multiple frequencies 2.42GHz, 2.86GHz, 6.3GHz, 6.94GHz and 7.96GHz. It is observed to have a good bandwidth and higher gain values at the targeted frequencies with the maximum gain of 9.81dB and thus used in WLAN, C band applications like weather radar systems and satellite communications","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129642539","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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