Pub Date : 2017-11-01DOI: 10.1109/WCNPS.2017.8252940
Fernando Marinho de Magalhäes, Bruno R. Monteiro, F. Lopes
A traveling wave-based directional element based on only current signals for parallel transmission lines is presented in this paper. With the current waveform samples captured in one-terminal of both parallel circuits, the direction of the first fault-induced traveling waves is identified. Therefore, by using two directional elements, one at each transmission line end, and applying a permissive overreaching transfer trip scheme through a communication channel in conjunction with an appropriate overcurrent supervision, it is possible to classify faults as internal or external from the monitored transmission line, without the need to analyze voltage traveling waves. This classification (internal and external) and fault direction identification (forward or reverse) can improve the performance of other protection schemes and accelerate the trip decision without compromising the protection security and reliability.
{"title":"Using current traveling waves to implement directional elements in parallel lines","authors":"Fernando Marinho de Magalhäes, Bruno R. Monteiro, F. Lopes","doi":"10.1109/WCNPS.2017.8252940","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8252940","url":null,"abstract":"A traveling wave-based directional element based on only current signals for parallel transmission lines is presented in this paper. With the current waveform samples captured in one-terminal of both parallel circuits, the direction of the first fault-induced traveling waves is identified. Therefore, by using two directional elements, one at each transmission line end, and applying a permissive overreaching transfer trip scheme through a communication channel in conjunction with an appropriate overcurrent supervision, it is possible to classify faults as internal or external from the monitored transmission line, without the need to analyze voltage traveling waves. This classification (internal and external) and fault direction identification (forward or reverse) can improve the performance of other protection schemes and accelerate the trip decision without compromising the protection security and reliability.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122586132","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8252938
Thales L. von Sperling, Francisco L. de Caldas Filho, R. D. de Sousa, Lucas M. C. e Martins, Rodrigo L. Rocha
The Internet of Things is increasingly gaining use in our society as can be seen by the significant growth in the number of devices connected to the most diverse Internet applications. But, most IoT devices include embedded software that cannot be updated and there is evidence that these devices present vulnerabilities exploitable even by the most simple forms of attacks, as for instance login attempts using simple combinations of known, or easy to guess, user identifications and passwords. These attacks would result in successful access by unauthorized entities to these devices. Considering these vulnerabilities, the concern for device protection mechanisms is raised. This paper proposes an IoT router that verifies the DNS traffic originated from IoT devices and performs the detection of IoT devices that are consulting unauthorized DNS servers. Our design is validated by means of a developed prototype that is submitted to functional tests in a real IoT network implemented in a controlled laboratory environment.
{"title":"Tracking intruders in IoT networks by means of DNS traffic analysis","authors":"Thales L. von Sperling, Francisco L. de Caldas Filho, R. D. de Sousa, Lucas M. C. e Martins, Rodrigo L. Rocha","doi":"10.1109/WCNPS.2017.8252938","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8252938","url":null,"abstract":"The Internet of Things is increasingly gaining use in our society as can be seen by the significant growth in the number of devices connected to the most diverse Internet applications. But, most IoT devices include embedded software that cannot be updated and there is evidence that these devices present vulnerabilities exploitable even by the most simple forms of attacks, as for instance login attempts using simple combinations of known, or easy to guess, user identifications and passwords. These attacks would result in successful access by unauthorized entities to these devices. Considering these vulnerabilities, the concern for device protection mechanisms is raised. This paper proposes an IoT router that verifies the DNS traffic originated from IoT devices and performs the detection of IoT devices that are consulting unauthorized DNS servers. Our design is validated by means of a developed prototype that is submitted to functional tests in a real IoT network implemented in a controlled laboratory environment.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124974534","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8252937
Mateus Da Rosa Zanatta, R. K. Miranda, J. P. J. D. Da Costa, F. Antreich, Daniel Valle de Lima
Global Navigation Satellite Systems (GNSS), such as American GPS, European Galileo, and Russian GLONASS are crucial for applications ranging from traditional civilian aviation to autonomous vehicles. Such applications require a very accurate positioning even in complex scenarios, where multipath components are present. In order to reduce the degradation of multipath components, the third generation of GPS system adds the L1 civil (L1C) pilot code and includes a Time Multiplexed Binary Offset Carrier (TMBOC) to operate alongside the standard Coarse Acquisition (C/A). In this paper, we propose tensor based techniques for antenna array based third generation GPS receivers. As shown in this paper, the tensor based approaches, namely, Canonical Polyadic Decomposition — Generalized Eigenvalue Decomposition (CPD- GEVD) and Higher Order Singular Value Decomposition (HOSVD), combined with the L1C signaling and TMBOC modulation considerably outperform the state-of-the-art solutions.
{"title":"Antenna array based receivers for third generation global positioning system","authors":"Mateus Da Rosa Zanatta, R. K. Miranda, J. P. J. D. Da Costa, F. Antreich, Daniel Valle de Lima","doi":"10.1109/WCNPS.2017.8252937","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8252937","url":null,"abstract":"Global Navigation Satellite Systems (GNSS), such as American GPS, European Galileo, and Russian GLONASS are crucial for applications ranging from traditional civilian aviation to autonomous vehicles. Such applications require a very accurate positioning even in complex scenarios, where multipath components are present. In order to reduce the degradation of multipath components, the third generation of GPS system adds the L1 civil (L1C) pilot code and includes a Time Multiplexed Binary Offset Carrier (TMBOC) to operate alongside the standard Coarse Acquisition (C/A). In this paper, we propose tensor based techniques for antenna array based third generation GPS receivers. As shown in this paper, the tensor based approaches, namely, Canonical Polyadic Decomposition — Generalized Eigenvalue Decomposition (CPD- GEVD) and Higher Order Singular Value Decomposition (HOSVD), combined with the L1C signaling and TMBOC modulation considerably outperform the state-of-the-art solutions.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127008854","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8253082
J. Gama, F. Lopes
Two-terminal fault location methods have been increasingly used by utilities since they overcome limitations of single-ended approaches. Most two terminal fault location algorithms found in the literature require measurements to be synchronized, what has been reported as the main problem of these approaches. This paper demonstrates the application of a method able to correct synchronization errors in phasor-based fault location procedures that originally require the data to be synchronized. In order to illustrate its performance, a well known two-terminal fault location algorithm based on synchronized data is taken into account. Compared with other works, the method is simpler and does not require iterative processes. Fault simulations using the Alternative Transients Program (ATP) were carried out to analyze the algorithm performance. The obtained results show that traditional fault location methods based on two-terminal synchronized data may be used without a common time reference, provided that the synchronization error is properly compensated prior to the final fault location estimation.
{"title":"On compensating synchronization errors in two-terminal based fault location approaches","authors":"J. Gama, F. Lopes","doi":"10.1109/WCNPS.2017.8253082","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8253082","url":null,"abstract":"Two-terminal fault location methods have been increasingly used by utilities since they overcome limitations of single-ended approaches. Most two terminal fault location algorithms found in the literature require measurements to be synchronized, what has been reported as the main problem of these approaches. This paper demonstrates the application of a method able to correct synchronization errors in phasor-based fault location procedures that originally require the data to be synchronized. In order to illustrate its performance, a well known two-terminal fault location algorithm based on synchronized data is taken into account. Compared with other works, the method is simpler and does not require iterative processes. Fault simulations using the Alternative Transients Program (ATP) were carried out to analyze the algorithm performance. The obtained results show that traditional fault location methods based on two-terminal synchronized data may be used without a common time reference, provided that the synchronization error is properly compensated prior to the final fault location estimation.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129073411","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8252933
A. C. Santos, F. Freitas, L. Fernandes
This paper presents results of the implementation and description of the basic formulation for the Holomorphic Embedding Load Flow Method (HELM). The approach is a noniterative technique proposed as an alternative method to solve the power flow problem. The basic formulation of the method is implemented by generation of an interface to use the data structure of the traditional MATPOWER. This is a free code tool which is developed in Matlab. Additionally, the same data files of this tool are used as input data for study carried out in this work. Also, the output results are adapted to have similar characteristics to the MATPOWER's output. Experiments and results for seven power systems demonstrate the validity of the new tool.
{"title":"Holomorphic embedding approach as an alternative method for solving the power flow problem","authors":"A. C. Santos, F. Freitas, L. Fernandes","doi":"10.1109/WCNPS.2017.8252933","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8252933","url":null,"abstract":"This paper presents results of the implementation and description of the basic formulation for the Holomorphic Embedding Load Flow Method (HELM). The approach is a noniterative technique proposed as an alternative method to solve the power flow problem. The basic formulation of the method is implemented by generation of an interface to use the data structure of the traditional MATPOWER. This is a free code tool which is developed in Matlab. Additionally, the same data files of this tool are used as input data for study carried out in this work. Also, the output results are adapted to have similar characteristics to the MATPOWER's output. Experiments and results for seven power systems demonstrate the validity of the new tool.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132146467","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8252935
Alcyone César Pereira Silva, L. de Menezes
This work presents an estimation method for the calculation of the error between numerical and analytical solutions of the Laplace Equation. The study is performed by obtaining general estimates for the exact error of the numerical difference equation. The method is based on the polynomial approximation of the error using relative dimension simulations. The work is validated by comparison between the discrete solutions and numerical results, and with general problems.
{"title":"Estimating the error between analytical and numerical finite difference solutions of laplace equation","authors":"Alcyone César Pereira Silva, L. de Menezes","doi":"10.1109/WCNPS.2017.8252935","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8252935","url":null,"abstract":"This work presents an estimation method for the calculation of the error between numerical and analytical solutions of the Laplace Equation. The study is performed by obtaining general estimates for the exact error of the numerical difference equation. The method is based on the polynomial approximation of the error using relative dimension simulations. The work is validated by comparison between the discrete solutions and numerical results, and with general problems.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122224617","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8252934
A. Escudero, F. A. M. Vásquez, Kleber Melo e Silva, F. Lopes
This work describes the modeling of busbar differential protection function by using the MODELS language available in the software Alternative Transients Program (ATP). This type of modeling includes data acquisition and signal conditioning modules for suitably implementing the commercially used 1-out-of-1 and 2-out-of-2 logics. This algorithm is based on instantaneous values of currents and considers an additional zone selection logic to keep up with the dynamic reconfiguration of flexible busbar arrangements. The results show that this type of modeling is a powerful tool for assessments of protection relays for any substation configuration in operational conditions, not readily available in actual records.
{"title":"Low-impedance busbar differential protection modeling and simulation using ATP/EMTP","authors":"A. Escudero, F. A. M. Vásquez, Kleber Melo e Silva, F. Lopes","doi":"10.1109/WCNPS.2017.8252934","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8252934","url":null,"abstract":"This work describes the modeling of busbar differential protection function by using the MODELS language available in the software Alternative Transients Program (ATP). This type of modeling includes data acquisition and signal conditioning modules for suitably implementing the commercially used 1-out-of-1 and 2-out-of-2 logics. This algorithm is based on instantaneous values of currents and considers an additional zone selection logic to keep up with the dynamic reconfiguration of flexible busbar arrangements. The results show that this type of modeling is a powerful tool for assessments of protection relays for any substation configuration in operational conditions, not readily available in actual records.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126586578","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8252931
R. Bainy, K. Silva
This paper presents the analysis of the benefits provided by Generalized Alpha Plane (GAP) to low-impedance busbar differential protection. Its main advantages are the simplicity and the possibility to define several restraint characteristics. In order to do so, the GAP was evaluated for busbar protection using the software ATPDraw, through which a wide variety of fault scenarios in a 230 kV double-bus single-breaker was simulated. The obtained results reveal that the GAP can improve the performance of the traditional differential protection formulation.
{"title":"Busbar differential protection based on generalized alpha plane","authors":"R. Bainy, K. Silva","doi":"10.1109/WCNPS.2017.8252931","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8252931","url":null,"abstract":"This paper presents the analysis of the benefits provided by Generalized Alpha Plane (GAP) to low-impedance busbar differential protection. Its main advantages are the simplicity and the possibility to define several restraint characteristics. In order to do so, the GAP was evaluated for busbar protection using the software ATPDraw, through which a wide variety of fault scenarios in a 230 kV double-bus single-breaker was simulated. The obtained results reveal that the GAP can improve the performance of the traditional differential protection formulation.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116315062","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8253083
E. A. Custódio, F. Lopes, J. Ribeiro
The use of high-speed protection relays allows an increasing of the power transmitted in transmission lines that are already in operation. The function analyzed in this paper uses instantaneous values of the incremental voltages and currents for the calculation of the fault position in relation to a protected zone, presenting average operation times smaller than those obtained through traditional phasor-based functions. In this way, the impact of the coupling capacitive voltage transformers (CCVT) on the security of the time-domain distance protection function TD21 is analyzed, comparing its performance when primary and secondary voltages signals are taken into account.
{"title":"CCVT impact on the TD21 function security","authors":"E. A. Custódio, F. Lopes, J. Ribeiro","doi":"10.1109/WCNPS.2017.8253083","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8253083","url":null,"abstract":"The use of high-speed protection relays allows an increasing of the power transmitted in transmission lines that are already in operation. The function analyzed in this paper uses instantaneous values of the incremental voltages and currents for the calculation of the fault position in relation to a protected zone, presenting average operation times smaller than those obtained through traditional phasor-based functions. In this way, the impact of the coupling capacitive voltage transformers (CCVT) on the security of the time-domain distance protection function TD21 is analyzed, comparing its performance when primary and secondary voltages signals are taken into account.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125901376","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 : 2017-11-01DOI: 10.1109/WCNPS.2017.8252939
E. Leite, F. Lopes
In this paper, the mathematical development of a traveling wave (TW)-based fault location scheme for hybrid transmission lines (HTLs) with two sections is presented and evaluated. The formulation is able to accurately estimate the fault point on HTLs taking into account the different propagation velocities on each section. In order to carry out the proposed studies, the Alternative Transients Program (ATP) was used to simulate various fault scenarios in a 220 kV/50 Hz test power system, considering different fault distances in a HTL consisting of an overhead transmission line in series with an underground high voltage cable line. In each case, the obtained fault location result is compared with the fault distance estimation computed using a traditional two-terminal TW-based fault location method. The obtained results show that the evaluated fault location formulation is accurate and easy-to-use.
{"title":"Traveling wave-based fault location formulation for hybrid lines with two sections","authors":"E. Leite, F. Lopes","doi":"10.1109/WCNPS.2017.8252939","DOIUrl":"https://doi.org/10.1109/WCNPS.2017.8252939","url":null,"abstract":"In this paper, the mathematical development of a traveling wave (TW)-based fault location scheme for hybrid transmission lines (HTLs) with two sections is presented and evaluated. The formulation is able to accurately estimate the fault point on HTLs taking into account the different propagation velocities on each section. In order to carry out the proposed studies, the Alternative Transients Program (ATP) was used to simulate various fault scenarios in a 220 kV/50 Hz test power system, considering different fault distances in a HTL consisting of an overhead transmission line in series with an underground high voltage cable line. In each case, the obtained fault location result is compared with the fault distance estimation computed using a traditional two-terminal TW-based fault location method. The obtained results show that the evaluated fault location formulation is accurate and easy-to-use.","PeriodicalId":293027,"journal":{"name":"2017 Workshop on Communication Networks and Power Systems (WCNPS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122124406","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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