Pub Date : 2006-09-01DOI: 10.1109/UPEC.2006.367603
Z. Tang, Y. Zou
Condition monitoring of circuit breaker is preference for cost saving in power utilities. However, extensive condition monitoring of circuit breaker is a hard task considering its tremendous number. Circuit breaker time, which is composed of opening time and arcing time, as well as its variation trends, can be used as an index to represent condition of mechanical and dielectric component of circuit breaker. Since the digital relay and digital fault recorder that can record dynamic process of circuit breaker operation, it is especially attractive to extract this data for circuit breaker information without hardware investment. In order to deduce circuit breaker time with transient data logged in substation automation system, a substation automation information management system is developed in this paper. The transient data follows transient data transformation standard (COMTRADE) is concentrated in controlling center. The information management system parses the composition and format of the logged data according COMTRADE, hence calculate and visualize the circuit breaker time and its variation trends
{"title":"Condition Monitoring System for Circuit Breaker Based on Substation Automation System","authors":"Z. Tang, Y. Zou","doi":"10.1109/UPEC.2006.367603","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367603","url":null,"abstract":"Condition monitoring of circuit breaker is preference for cost saving in power utilities. However, extensive condition monitoring of circuit breaker is a hard task considering its tremendous number. Circuit breaker time, which is composed of opening time and arcing time, as well as its variation trends, can be used as an index to represent condition of mechanical and dielectric component of circuit breaker. Since the digital relay and digital fault recorder that can record dynamic process of circuit breaker operation, it is especially attractive to extract this data for circuit breaker information without hardware investment. In order to deduce circuit breaker time with transient data logged in substation automation system, a substation automation information management system is developed in this paper. The transient data follows transient data transformation standard (COMTRADE) is concentrated in controlling center. The information management system parses the composition and format of the logged data according COMTRADE, hence calculate and visualize the circuit breaker time and its variation trends","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127042591","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367630
A. Rahmati, A. Abrishamifar, E. Abiri
A static compensator (STATCOM) is a viable solution for improving power quality in distribution systems. This technology has resulted in an equipment that is principally different from conventional static Var compensator (SVC). In this paper direct power control of three-phase pulsewidth-modulated inverter without voltage line sensors is applied to a distribution static compensator (DSTATCOM). It is shown that this controller is suitable for mitigation of short term interruption, voltage dips, harmonics and flicker fluctuations
{"title":"Sensorless Direct Power Control for a DSTATCOM","authors":"A. Rahmati, A. Abrishamifar, E. Abiri","doi":"10.1109/UPEC.2006.367630","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367630","url":null,"abstract":"A static compensator (STATCOM) is a viable solution for improving power quality in distribution systems. This technology has resulted in an equipment that is principally different from conventional static Var compensator (SVC). In this paper direct power control of three-phase pulsewidth-modulated inverter without voltage line sensors is applied to a distribution static compensator (DSTATCOM). It is shown that this controller is suitable for mitigation of short term interruption, voltage dips, harmonics and flicker fluctuations","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"115 18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126369741","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367763
H. El-Tamaly, H. Ziedan
This paper is aimed at determining the sequence impedances of transmission lines, including the negative-, positive-, and zero-sequence impedance for single- and double-circuit lines. There are several methods used to determine the sequence impedances such as Carson, later modified by others, and Rudenberg. A comparative study is made between Carson and Rudenberg methods in their prediction of sequence impedances of overhead lines.
{"title":"Sequence Impedances of Overhead Transmission Lines Carson's Method Versus Rudenberg's Method","authors":"H. El-Tamaly, H. Ziedan","doi":"10.1109/UPEC.2006.367763","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367763","url":null,"abstract":"This paper is aimed at determining the sequence impedances of transmission lines, including the negative-, positive-, and zero-sequence impedance for single- and double-circuit lines. There are several methods used to determine the sequence impedances such as Carson, later modified by others, and Rudenberg. A comparative study is made between Carson and Rudenberg methods in their prediction of sequence impedances of overhead lines.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126415877","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367618
A. Ametani, T. Goto, S. Yoshizaki, H. Omura, H. Motoyama
This paper has investigated switching surge characteristics in low-voltage control circuits transferred from main circuits of gas insulated substations through measuring voltage transformers (VT) and current transformers (CT) based on field measurements and EMTP simulations. The oscillating frequency of the switching surges in main circuits ranges from some MHz to some 10 MHz, and the surge voltages on a control cable are from some 10 V to 300 V in the EMTP simulation. The simulation results agree with the field measurements of the oscillating frequency ranging from 2 MHz to 80 MHz, which don't support the IEC 61000-4-12 recommended frequency 100 kHz and 1 MHz. The measured voltages range from 10 V to nearly 500 V. Mutual coupling between the main circuits and the control cable induces a high frequency oscillating voltage which are superposed on the transferred voltage. Grounding the both ends of the control cable metallic sheath produces another oscillation due to a circulating current in a closed loop composed of the sheath and the grounding circuit.
{"title":"Switching Surge Characteristics in Gas-Insulated Substation","authors":"A. Ametani, T. Goto, S. Yoshizaki, H. Omura, H. Motoyama","doi":"10.1109/UPEC.2006.367618","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367618","url":null,"abstract":"This paper has investigated switching surge characteristics in low-voltage control circuits transferred from main circuits of gas insulated substations through measuring voltage transformers (VT) and current transformers (CT) based on field measurements and EMTP simulations. The oscillating frequency of the switching surges in main circuits ranges from some MHz to some 10 MHz, and the surge voltages on a control cable are from some 10 V to 300 V in the EMTP simulation. The simulation results agree with the field measurements of the oscillating frequency ranging from 2 MHz to 80 MHz, which don't support the IEC 61000-4-12 recommended frequency 100 kHz and 1 MHz. The measured voltages range from 10 V to nearly 500 V. Mutual coupling between the main circuits and the control cable induces a high frequency oscillating voltage which are superposed on the transferred voltage. Grounding the both ends of the control cable metallic sheath produces another oscillation due to a circulating current in a closed loop composed of the sheath and the grounding circuit.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121599875","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367736
R. D. de Graaff, J. Myrzik, W. Kling, J. Enslin
Medium voltage distribution feeders are generally not loaded to their nominal rating because of redundancy considerations. During repair of a faulted feeder the loads will be switched to another feeder to limit the customer interruption time. This spare capacity needs to be reserved on each of the concerned cables. To make some of the spare capacity available for increased loading the application of a series controller is proposed. This paper shows simulations of cable distribution systems both with and without series controllers, and compares the results. It is shown how series controllers can increase the maximum loading of distribution systems.
{"title":"Series Controllers in Distribution Systems - Facilitating Increased Loading","authors":"R. D. de Graaff, J. Myrzik, W. Kling, J. Enslin","doi":"10.1109/UPEC.2006.367736","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367736","url":null,"abstract":"Medium voltage distribution feeders are generally not loaded to their nominal rating because of redundancy considerations. During repair of a faulted feeder the loads will be switched to another feeder to limit the customer interruption time. This spare capacity needs to be reserved on each of the concerned cables. To make some of the spare capacity available for increased loading the application of a series controller is proposed. This paper shows simulations of cable distribution systems both with and without series controllers, and compares the results. It is shown how series controllers can increase the maximum loading of distribution systems.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121753744","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367518
R. Brandao, J. B. Beleza Carvalho, F. Barbosa
With the development of electric power systems and their increase of complexity, basically due to the interconnection to other production centres, impose the necessity of introduction of new control system techniques. The efficiency of these control centres is only possible if data received from network arrives quickly and with accuracy. The basic task of a system operation is to get a reliable and accurate real time network model. In the past and even in the present, the real time network model is obtained by the use of system control and data acquisition (SCADA) and processing of the SCADA data via state estimator algorithms. Today's reality is different, intelligent electronic devices (IEDs), digital fault recorders (DFRs), phase measurement units (PMUs) and relays, collects an enormous amount of data that arrives to control centres through SCADA system. So, other ways to validate and utilize this data are needed.
{"title":"GPS Synchronized Measurements in Power Systems State Estimation: An Overview","authors":"R. Brandao, J. B. Beleza Carvalho, F. Barbosa","doi":"10.1109/UPEC.2006.367518","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367518","url":null,"abstract":"With the development of electric power systems and their increase of complexity, basically due to the interconnection to other production centres, impose the necessity of introduction of new control system techniques. The efficiency of these control centres is only possible if data received from network arrives quickly and with accuracy. The basic task of a system operation is to get a reliable and accurate real time network model. In the past and even in the present, the real time network model is obtained by the use of system control and data acquisition (SCADA) and processing of the SCADA data via state estimator algorithms. Today's reality is different, intelligent electronic devices (IEDs), digital fault recorders (DFRs), phase measurement units (PMUs) and relays, collects an enormous amount of data that arrives to control centres through SCADA system. So, other ways to validate and utilize this data are needed.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121864444","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367529
W. Du, Z. Chen, H.F. Wang, P. Ju
Unified power flow controller (UPFC) is of multiple control functions to regulate AC voltage, active power and reactive power flow. Research has found that existence of dynamic interactions among those multiple control functions may result in poor control performance and even closed-loop system instability. This paper investigates the UPFC's controllable parameter region with variations of UPFC control operating conditions as far as UPFC control interactions are concerned. Results in the paper demonstrate that the UPFC's controllable parameter region and existence of interactions change with variations of UPFC control operating conditions. Suggestions are given in the paper to improve UPFC robustness to the variations
{"title":"Robustness of Unified Power Flow Controller to the Variations of Control Operating Conditions","authors":"W. Du, Z. Chen, H.F. Wang, P. Ju","doi":"10.1109/UPEC.2006.367529","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367529","url":null,"abstract":"Unified power flow controller (UPFC) is of multiple control functions to regulate AC voltage, active power and reactive power flow. Research has found that existence of dynamic interactions among those multiple control functions may result in poor control performance and even closed-loop system instability. This paper investigates the UPFC's controllable parameter region with variations of UPFC control operating conditions as far as UPFC control interactions are concerned. Results in the paper demonstrate that the UPFC's controllable parameter region and existence of interactions change with variations of UPFC control operating conditions. Suggestions are given in the paper to improve UPFC robustness to the variations","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130333311","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367524
J. Syllignakis, T. Papazoglou
This work presents a study on steady state simulation (power flow) of Crete system's operation. Two different scenarios were investigated in order to extract conclusions on the impacts of the contribution of Atherinolakos power plant to the Crete power system operation. The first scenario presents the Crete system in a typical loads operation before the Atherinolakos installation. The second one presents the operation of the system with the same loads, including the Atherinolakos plant on operation. The system data used in simulation are very close to the real ones. Most of them are according to the PPC (Power Public Corporation). The results obtained from the simulation tests show that in the second scenario the voltages are much closer to their nominal value. The power losses on transmission lines are less
{"title":"Study of Impact on Crete System Operation of the Atherinolakos Power Plant","authors":"J. Syllignakis, T. Papazoglou","doi":"10.1109/UPEC.2006.367524","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367524","url":null,"abstract":"This work presents a study on steady state simulation (power flow) of Crete system's operation. Two different scenarios were investigated in order to extract conclusions on the impacts of the contribution of Atherinolakos power plant to the Crete power system operation. The first scenario presents the Crete system in a typical loads operation before the Atherinolakos installation. The second one presents the operation of the system with the same loads, including the Atherinolakos plant on operation. The system data used in simulation are very close to the real ones. Most of them are according to the PPC (Power Public Corporation). The results obtained from the simulation tests show that in the second scenario the voltages are much closer to their nominal value. The power losses on transmission lines are less","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130434260","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367602
S. Jamali, M. Javdan, H. Shateri, M. Ghorbani
The conventional load flow methods for transmission systems could not be utilized for distribution systems, due to their especial characteristics. If methods like Newton-Raphson and fast-decoupled are used for distribution systems, the probability of the convergence would be low. Therefore, due to inherent characteristics of distribution systems, it is essential to develop the distribution version of the load flow methods. One of the applications of distribution load flow methods is in the design process, at either MV or LV level. There are two types of loads in the design process, current committed and demand committed loads that both must be considered by load flow for design purpose. This paper presents a load flow method for distribution network design, which can handle both current and demand committed loads
{"title":"Load Flow Method for Distribution Network Design by Considering Committed Loads","authors":"S. Jamali, M. Javdan, H. Shateri, M. Ghorbani","doi":"10.1109/UPEC.2006.367602","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367602","url":null,"abstract":"The conventional load flow methods for transmission systems could not be utilized for distribution systems, due to their especial characteristics. If methods like Newton-Raphson and fast-decoupled are used for distribution systems, the probability of the convergence would be low. Therefore, due to inherent characteristics of distribution systems, it is essential to develop the distribution version of the load flow methods. One of the applications of distribution load flow methods is in the design process, at either MV or LV level. There are two types of loads in the design process, current committed and demand committed loads that both must be considered by load flow for design purpose. This paper presents a load flow method for distribution network design, which can handle both current and demand committed loads","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124634419","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367607
Dingding Yuanw, Xinzhou Dong, S. Chen, Z. Bo, B. Caunce, A. Klimek
This paper presents a new directional comparison protection scheme specially designed for distribution systems. A comprehensive study is performed on different directional discrimination algorithms and relaying schemes in order to assess their performances in distribution systems. An integrated solution was proposed, which combines better performed directional algorithms, such as the Negative sequence-based algorithm and superimposed component-based algorithm, etc. which together forms a new scheme to cover various system and fault conditions. Combined blocking scheme is proposed for better reliability and synchronization. Extensive EMTP simulation studies proved that the algorithm and its associated protection scheme are able to provide fast and reliable responses for all fault conditions. In particular, it is able to give correct responses adapting to the change of system operation conditions, including the changing of system configuration, power flow direction, and source and tapped-off-load conditions.
{"title":"An New Directional Comparison Scheme for Distribution Line Protection","authors":"Dingding Yuanw, Xinzhou Dong, S. Chen, Z. Bo, B. Caunce, A. Klimek","doi":"10.1109/UPEC.2006.367607","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367607","url":null,"abstract":"This paper presents a new directional comparison protection scheme specially designed for distribution systems. A comprehensive study is performed on different directional discrimination algorithms and relaying schemes in order to assess their performances in distribution systems. An integrated solution was proposed, which combines better performed directional algorithms, such as the Negative sequence-based algorithm and superimposed component-based algorithm, etc. which together forms a new scheme to cover various system and fault conditions. Combined blocking scheme is proposed for better reliability and synchronization. Extensive EMTP simulation studies proved that the algorithm and its associated protection scheme are able to provide fast and reliable responses for all fault conditions. In particular, it is able to give correct responses adapting to the change of system operation conditions, including the changing of system configuration, power flow direction, and source and tapped-off-load conditions.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131653266","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：