Pub Date : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850437
M. Noah, A. Shaltout
Power transformer protective relay should block the tripping during magnetizing inrush, external faults and rapidly operates the tripping during internal faults and should be sensitive enough to detect minor winding faults. This paper presents an online, simple protection method based on instantaneous voltages and currents readings. It is possible to discriminate between internal and external faults, between switching on fault and inrush current by tracking the contour of calculated positive sequence admittance on the two transformer sides. Also, minor winding faults could be detected by constructing the voltage difference-input current (ΔV-I) locus diagram and comparing it with the healthy locus and providing alarming or tripping when unacceptable winding fault is occurring. The proposed protection technique has been studied and simulated using MATLAB/SIMULINK tool.
{"title":"Fault discrimination and protection of power transformers using voltage and current signals","authors":"M. Noah, A. Shaltout","doi":"10.1109/ENERGYCON.2014.6850437","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850437","url":null,"abstract":"Power transformer protective relay should block the tripping during magnetizing inrush, external faults and rapidly operates the tripping during internal faults and should be sensitive enough to detect minor winding faults. This paper presents an online, simple protection method based on instantaneous voltages and currents readings. It is possible to discriminate between internal and external faults, between switching on fault and inrush current by tracking the contour of calculated positive sequence admittance on the two transformer sides. Also, minor winding faults could be detected by constructing the voltage difference-input current (ΔV-I) locus diagram and comparing it with the healthy locus and providing alarming or tripping when unacceptable winding fault is occurring. The proposed protection technique has been studied and simulated using MATLAB/SIMULINK tool.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114665123","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850500
M. Karakose, M. Baygin
Reconfiguration process is very important in terms of efficiency in photovoltaic (PV) arrays under especially in partial shading conditions. Although there are some studies for reconfiguration process in the literature, they are difficult and complex. In this study, full or partial shading effects on arrays are examined and presented for reconfiguration of PV arrays. System performance is intended to increase by making image-processing based moving shadow analysis. Reconfiguration of PV arrays is provided with proposed approach under the partial shading conditions without information of current (I), voltage (V) and power (P) which is quite difficult to measure. Experimental results are verified by using a video image obtained from a real PV array and effective results are obtained.
{"title":"Image processing based analysis of moving shadow effects for reconfiguration in PV arrays","authors":"M. Karakose, M. Baygin","doi":"10.1109/ENERGYCON.2014.6850500","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850500","url":null,"abstract":"Reconfiguration process is very important in terms of efficiency in photovoltaic (PV) arrays under especially in partial shading conditions. Although there are some studies for reconfiguration process in the literature, they are difficult and complex. In this study, full or partial shading effects on arrays are examined and presented for reconfiguration of PV arrays. System performance is intended to increase by making image-processing based moving shadow analysis. Reconfiguration of PV arrays is provided with proposed approach under the partial shading conditions without information of current (I), voltage (V) and power (P) which is quite difficult to measure. Experimental results are verified by using a video image obtained from a real PV array and effective results are obtained.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124446604","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850434
A. Picanco, F. C. Poderoso, T. A. Nascimento
This paper presents the relation between the losses and capacitances in three-phase distribution transformers. The motivation stems from the search of projects with reduction of losses and economic viability as the variation of the constructive parameters, which varies the losses consequently, changes of capacitances. This paper aims to obtain knowledge about how the changes in the design whose goal is loss reduction, change the capacitances and initial distribution of voltage on the winding, parameters that may change the behavior of transformers especially when under disturbances of high levels frequency.
{"title":"Capacitances versus losses in distribution transformers design","authors":"A. Picanco, F. C. Poderoso, T. A. Nascimento","doi":"10.1109/ENERGYCON.2014.6850434","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850434","url":null,"abstract":"This paper presents the relation between the losses and capacitances in three-phase distribution transformers. The motivation stems from the search of projects with reduction of losses and economic viability as the variation of the constructive parameters, which varies the losses consequently, changes of capacitances. This paper aims to obtain knowledge about how the changes in the design whose goal is loss reduction, change the capacitances and initial distribution of voltage on the winding, parameters that may change the behavior of transformers especially when under disturbances of high levels frequency.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125925665","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850571
C. Su, Hsiang-Ming Chuang
High penetration levels of distributed generation (DG) significantly affect the operations of distribution networks that they are connected. Different network reinforcement alternatives that provide different levels of improvements to fit with special requirements of individual utility are available. From a cost-benefit point of view, an optimal investment strategy is necessary for network reinforcements in a cost-effective manner. This paper aims presenting a methodology for optimal planning of network reinforcements to accommodate increased connection of DG to distribution networks. An objective function, which contains three objectives including investment cost, customer interruption cost, and network losses conversion cost, is minimized subject to system operation constraints. A multi-stage approach based on genetic algorithms (GAs) is then used to derive long-term investment planning and network configurations in the planning period. Test results of a practical distribution feeder system connected to wind power generations is selected for computer simulation in order to ensure and demonstrate performance of the proposed method.
{"title":"Distribution network reinforcement planning for high penetration level of distributed generation","authors":"C. Su, Hsiang-Ming Chuang","doi":"10.1109/ENERGYCON.2014.6850571","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850571","url":null,"abstract":"High penetration levels of distributed generation (DG) significantly affect the operations of distribution networks that they are connected. Different network reinforcement alternatives that provide different levels of improvements to fit with special requirements of individual utility are available. From a cost-benefit point of view, an optimal investment strategy is necessary for network reinforcements in a cost-effective manner. This paper aims presenting a methodology for optimal planning of network reinforcements to accommodate increased connection of DG to distribution networks. An objective function, which contains three objectives including investment cost, customer interruption cost, and network losses conversion cost, is minimized subject to system operation constraints. A multi-stage approach based on genetic algorithms (GAs) is then used to derive long-term investment planning and network configurations in the planning period. Test results of a practical distribution feeder system connected to wind power generations is selected for computer simulation in order to ensure and demonstrate performance of the proposed method.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128201624","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850420
K. Sedghisigarchi, Yadollah Eslami, A. Davari, Stephen Wilkerson
This paper presents a coordinated control method for inverter based distributed generators operating in low voltage microgrids. Power flow output for each generator is adjusted using a local controller optimally tuned for operation in low voltage distribution lines. The output active and reactive power set points for each controller is adjusted through a communication network. The real time simultaneous operations of two grid-connected inverters are implemented and tested on a small scale test bed for various case studies. The experimental results confirm the accuracy and effectiveness of the proposed controller.
{"title":"A real-time testbed for coordinated control of inverters in LV microgrids","authors":"K. Sedghisigarchi, Yadollah Eslami, A. Davari, Stephen Wilkerson","doi":"10.1109/ENERGYCON.2014.6850420","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850420","url":null,"abstract":"This paper presents a coordinated control method for inverter based distributed generators operating in low voltage microgrids. Power flow output for each generator is adjusted using a local controller optimally tuned for operation in low voltage distribution lines. The output active and reactive power set points for each controller is adjusted through a communication network. The real time simultaneous operations of two grid-connected inverters are implemented and tested on a small scale test bed for various case studies. The experimental results confirm the accuracy and effectiveness of the proposed controller.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128601130","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850538
I. Petrović, M. Vrazic
Modeling of photo-voltaic (PV) system electrical energy production is necessary in order to determine the most efficient parameters (slope, azimuth, etc.) at the location of planed PV system. The most common methods in PV plant modelling use multi-year average input values of irradiation and temperature for a selected location. When using multi-year averages it is necessary to take into consideration possibilities of single year variations. Each year can deviate more or less from the average values, which can be assessed by comparing the last few years with the average year, possible only if the measured data for the specified location is available. In this research a single year of measured data is used to find a better description of the location for the existing PV systems. The results will later enable better modelling of any PV system in the area near the provided PV and measuring systems. Clearness index is a ratio of the solar irradiation on the horizontal surface on Earth and irradiation at the top of the atmosphere.
{"title":"Approach to advanced clearness index modelling","authors":"I. Petrović, M. Vrazic","doi":"10.1109/ENERGYCON.2014.6850538","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850538","url":null,"abstract":"Modeling of photo-voltaic (PV) system electrical energy production is necessary in order to determine the most efficient parameters (slope, azimuth, etc.) at the location of planed PV system. The most common methods in PV plant modelling use multi-year average input values of irradiation and temperature for a selected location. When using multi-year averages it is necessary to take into consideration possibilities of single year variations. Each year can deviate more or less from the average values, which can be assessed by comparing the last few years with the average year, possible only if the measured data for the specified location is available. In this research a single year of measured data is used to find a better description of the location for the existing PV systems. The results will later enable better modelling of any PV system in the area near the provided PV and measuring systems. Clearness index is a ratio of the solar irradiation on the horizontal surface on Earth and irradiation at the top of the atmosphere.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127181276","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850486
J. Krstulovic, Vladimiro Miranda
This paper discusses mechanisms for establishing an efficient decentralized methodology for the reconstruction of topology in power systems. The maximum mutual information criterion is proposed as a selection criterion for the inputs of a distributed topology estimator, based on mosaic of local auto-associative neural networks. The proposed concepts offer some strong theoretical support for an information theoretic perspective on power system state estimation. The results are confirmed by extensive tests conducted on the IEEE RTS 24-bus system.
{"title":"Selection of measurements in topology estimation with mutual information","authors":"J. Krstulovic, Vladimiro Miranda","doi":"10.1109/ENERGYCON.2014.6850486","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850486","url":null,"abstract":"This paper discusses mechanisms for establishing an efficient decentralized methodology for the reconstruction of topology in power systems. The maximum mutual information criterion is proposed as a selection criterion for the inputs of a distributed topology estimator, based on mosaic of local auto-associative neural networks. The proposed concepts offer some strong theoretical support for an information theoretic perspective on power system state estimation. The results are confirmed by extensive tests conducted on the IEEE RTS 24-bus system.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129003917","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850524
Yakubu Tsado, David Lund, K. Gamage
The concept of Smart grid technology sets greater demands for reliability and resilience on communications infrastructure. Wireless communication is a promising alternative for distribution level, Home Area Network (HAN), smart metering and even the backbone networks that connect smart grid applications to control centres. In this paper, the reliability and resilience of smart grid communication network is analysed using the IEEE 802.11 communication technology in both infrastructure single hop and mesh multiple-hop topologies for smart meters in a Building Area Network (BAN). Performance of end to end delay and Round Trip Time (RTT) of an infrastructure mode smart meter network for Demand Response (DR) function is presented. Hybrid deployment of these network topologies is also suggested to provide resilience and redundancy in the network during network failure or when security of the network is circumvented. This recommendation can also be deployed in other areas of the grid where wireless technologies are used. DR communication from consumer premises is used to show the performance of an infrastructure mode smart metering network.
{"title":"Resilient wireless communication networking for Smart grid BAN","authors":"Yakubu Tsado, David Lund, K. Gamage","doi":"10.1109/ENERGYCON.2014.6850524","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850524","url":null,"abstract":"The concept of Smart grid technology sets greater demands for reliability and resilience on communications infrastructure. Wireless communication is a promising alternative for distribution level, Home Area Network (HAN), smart metering and even the backbone networks that connect smart grid applications to control centres. In this paper, the reliability and resilience of smart grid communication network is analysed using the IEEE 802.11 communication technology in both infrastructure single hop and mesh multiple-hop topologies for smart meters in a Building Area Network (BAN). Performance of end to end delay and Round Trip Time (RTT) of an infrastructure mode smart meter network for Demand Response (DR) function is presented. Hybrid deployment of these network topologies is also suggested to provide resilience and redundancy in the network during network failure or when security of the network is circumvented. This recommendation can also be deployed in other areas of the grid where wireless technologies are used. DR communication from consumer premises is used to show the performance of an infrastructure mode smart metering network.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130563160","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850487
C. Sourkounis
The stochastic nature of wind resources limits the maximum wind power that can be connected to existing electrical grids due to due to a variety of techno-economic reasons. In this paper concepts of dynamic power conditioning in wind parks are presented, which envisage support and management of the electrical grid through compensation of active and reactive power. A dynamic energy storage system is implemented, that acts as an intermediate wind energy buffer, compensating for short-term fluctuations of the energy source and variations in the load. As a result the power delivered from the wind park to the grid can be smoothed and the grid impact is minimized. Different power management methods are investigated and compared in the time and frequency domain. The required storage capacity and power rating depend on the storage management method chosen.
{"title":"Storage system management for power conditioning in wind parks","authors":"C. Sourkounis","doi":"10.1109/ENERGYCON.2014.6850487","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850487","url":null,"abstract":"The stochastic nature of wind resources limits the maximum wind power that can be connected to existing electrical grids due to due to a variety of techno-economic reasons. In this paper concepts of dynamic power conditioning in wind parks are presented, which envisage support and management of the electrical grid through compensation of active and reactive power. A dynamic energy storage system is implemented, that acts as an intermediate wind energy buffer, compensating for short-term fluctuations of the energy source and variations in the load. As a result the power delivered from the wind park to the grid can be smoothed and the grid impact is minimized. Different power management methods are investigated and compared in the time and frequency domain. The required storage capacity and power rating depend on the storage management method chosen.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125410282","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 : 2014-05-13DOI: 10.1109/ENERGYCON.2014.6850455
I. Priedīte
The paper illustrates economical assessment of the grid-connected onshore micro wind turbines. The calculation is based on onshore wind speed hourly minimum value of 4 m height in Latvia approximated according to each wind turbine tower height. Economical assessment of the grid-connected solar cells is studied based on the real solar cells output data of Latvia. Results of performed study show that the use of solar cells 25 years for power generation in Latvia is profitable.
{"title":"Economic assessment of onshore micro wind turbines and solar cells for power generation in Latvia","authors":"I. Priedīte","doi":"10.1109/ENERGYCON.2014.6850455","DOIUrl":"https://doi.org/10.1109/ENERGYCON.2014.6850455","url":null,"abstract":"The paper illustrates economical assessment of the grid-connected onshore micro wind turbines. The calculation is based on onshore wind speed hourly minimum value of 4 m height in Latvia approximated according to each wind turbine tower height. Economical assessment of the grid-connected solar cells is studied based on the real solar cells output data of Latvia. Results of performed study show that the use of solar cells 25 years for power generation in Latvia is profitable.","PeriodicalId":410611,"journal":{"name":"2014 IEEE International Energy Conference (ENERGYCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125566326","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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