Pub Date : 2011-05-11DOI: 10.1109/POWERENG.2011.6036452
L. L. Pfitscher, D. Bernardon, L. M. Kopp, A. A. Ferreira, M. Heckler, B. Thomé, P. Montani, D. R. Fagundes
Rice cropping farms are significant loads in power systems due to the large amount of electrical energy required by the irrigation system. In Brazil, power companies invest in research to improve energy efficiency of this type of load. This paper presents an automated irrigation system based on supervisory control (SCADA) and wireless communication. The main objective of the project is to monitor and control the level of water in the crop, which represents an important impact on energy efficiency and water consumption. Specific characteristics of rice cropping irrigation was taken into account, such as large distances involved and different working schemes of water pumps. A complete solution is presented and it includes equipment description for reliable communication and supervisory features.
{"title":"An automated irrigation system for rice cropping with remote supervision","authors":"L. L. Pfitscher, D. Bernardon, L. M. Kopp, A. A. Ferreira, M. Heckler, B. Thomé, P. Montani, D. R. Fagundes","doi":"10.1109/POWERENG.2011.6036452","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036452","url":null,"abstract":"Rice cropping farms are significant loads in power systems due to the large amount of electrical energy required by the irrigation system. In Brazil, power companies invest in research to improve energy efficiency of this type of load. This paper presents an automated irrigation system based on supervisory control (SCADA) and wireless communication. The main objective of the project is to monitor and control the level of water in the crop, which represents an important impact on energy efficiency and water consumption. Specific characteristics of rice cropping irrigation was taken into account, such as large distances involved and different working schemes of water pumps. A complete solution is presented and it includes equipment description for reliable communication and supervisory features.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130440871","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036549
N. Batista, R. Melício, J. C. O. Marias, J. Catalão
The rapid growth of wind power generation and the need for a smarter electrical grid with a decentralized energy generation, especially in the urban areas, has increased the interest in vertical axis wind turbines (VAWT). The Darrieus type VAWT performance prediction is a very complex task, since its blades move around the rotor axis in a three dimensional aerodynamic environment that leads to several flow phenomena, such as, dynamic stall, flow separation, flow wake deformations and their natural inability to self-start. In the lift-type turbines the self-start incapability can be overcome with the use of several more or less complex solutions, being one of them the development of a blade profile capable of making the wind turbines self-start. Hence, this paper focuses on presenting a new methodology for fast development of new blade profiles, for self-start capable Darrieus type VAWT.
{"title":"Self-start evaluation in lift-type vertical axis wind turbines: Methodology and computational tool applied to asymmetrical airfoils","authors":"N. Batista, R. Melício, J. C. O. Marias, J. Catalão","doi":"10.1109/POWERENG.2011.6036549","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036549","url":null,"abstract":"The rapid growth of wind power generation and the need for a smarter electrical grid with a decentralized energy generation, especially in the urban areas, has increased the interest in vertical axis wind turbines (VAWT). The Darrieus type VAWT performance prediction is a very complex task, since its blades move around the rotor axis in a three dimensional aerodynamic environment that leads to several flow phenomena, such as, dynamic stall, flow separation, flow wake deformations and their natural inability to self-start. In the lift-type turbines the self-start incapability can be overcome with the use of several more or less complex solutions, being one of them the development of a blade profile capable of making the wind turbines self-start. Hence, this paper focuses on presenting a new methodology for fast development of new blade profiles, for self-start capable Darrieus type VAWT.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133118845","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036471
M. Ahmadi, E. Galván, J. Carrasco
In this paper, a new soft switching bidirectional cuk converter is introduced which can be applied as the interface circuit between DC bus and batteries for stand-alone photovoltaic systems. Since the voltage level of DC bus and batteries are different, the interface circuit must be able to increase or decrease the voltage level in each power flow direction while limiting the current. In contrast to almost all previous introduced bidirectional converters, the proposed bidirectional converter uses only one auxiliary switch to provide soft switching condition for all semiconductor devices. Low weight, small volume, high efficiency and reduced switching losses are the most important features of the proposed bidirectional converter. The converter operational modes are analyzed and simulation results are given to confirm the theoretical analysis.
{"title":"New soft switched interface circuit with reduced switch count for stand-alone photovoltaic systems","authors":"M. Ahmadi, E. Galván, J. Carrasco","doi":"10.1109/POWERENG.2011.6036471","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036471","url":null,"abstract":"In this paper, a new soft switching bidirectional cuk converter is introduced which can be applied as the interface circuit between DC bus and batteries for stand-alone photovoltaic systems. Since the voltage level of DC bus and batteries are different, the interface circuit must be able to increase or decrease the voltage level in each power flow direction while limiting the current. In contrast to almost all previous introduced bidirectional converters, the proposed bidirectional converter uses only one auxiliary switch to provide soft switching condition for all semiconductor devices. Low weight, small volume, high efficiency and reduced switching losses are the most important features of the proposed bidirectional converter. The converter operational modes are analyzed and simulation results are given to confirm the theoretical analysis.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132705138","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036457
N. Mariun, M. R. Mehrjou, M. Marhaban, N. Misron
Incipient fault detection of the induction machines (IM) prevents the unscheduled downtime and hence reduces maintenance costs. Condition monitoring, signal processing and data analysis are the key parts of the EVI fault detection scheme. The Motor Current Signature Analysis (MCSA) is considered as an effective condition monitoring method in any EVI. However, a signal processing technique, which enhances the fault signature and suppress the dominant system dynamics and noise, must be considered. Windowed Fourier transform analysis and wavelet are of the most considered signal processing methods. However, some parameters influence their ability and accuracy. This paper intends to investigate the effectiveness of these methods for incipient fault detection. Accordingly, current signal was measured and analyzed for broken rotor bar diagnosis in a squirrel-cage induction machine. Results indicated that though windowing improves Fourier transform analysis, it is not capable of accurate incipient fault detection. In other words, wavelet analysis is superior for this purpose.
{"title":"An experimental study of induction motor current signature analysis techniques for incipient broken rotor bar detection","authors":"N. Mariun, M. R. Mehrjou, M. Marhaban, N. Misron","doi":"10.1109/POWERENG.2011.6036457","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036457","url":null,"abstract":"Incipient fault detection of the induction machines (IM) prevents the unscheduled downtime and hence reduces maintenance costs. Condition monitoring, signal processing and data analysis are the key parts of the EVI fault detection scheme. The Motor Current Signature Analysis (MCSA) is considered as an effective condition monitoring method in any EVI. However, a signal processing technique, which enhances the fault signature and suppress the dominant system dynamics and noise, must be considered. Windowed Fourier transform analysis and wavelet are of the most considered signal processing methods. However, some parameters influence their ability and accuracy. This paper intends to investigate the effectiveness of these methods for incipient fault detection. Accordingly, current signal was measured and analyzed for broken rotor bar diagnosis in a squirrel-cage induction machine. Results indicated that though windowing improves Fourier transform analysis, it is not capable of accurate incipient fault detection. In other words, wavelet analysis is superior for this purpose.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130804064","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036427
A. Nagliero, R. Mastromauro, Marco Liserre, A. Dell'Aquila
Universal wind power generation systems (WPGS) should be able to operate both grid-connected and in island mode without compromising the power quality. The control system of a universal WPGS has to manage the different connections and provide harmonic disturbances compensation. This paper proposes the use of resonant filters for harmonics rejection both in grid-connected and island operation mode but within a different control structure. The proposed control has been tested in simulation.
{"title":"Harmonic control strategy for universal operation of wind turbine systems","authors":"A. Nagliero, R. Mastromauro, Marco Liserre, A. Dell'Aquila","doi":"10.1109/POWERENG.2011.6036427","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036427","url":null,"abstract":"Universal wind power generation systems (WPGS) should be able to operate both grid-connected and in island mode without compromising the power quality. The control system of a universal WPGS has to manage the different connections and provide harmonic disturbances compensation. This paper proposes the use of resonant filters for harmonics rejection both in grid-connected and island operation mode but within a different control structure. The proposed control has been tested in simulation.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130824199","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036416
L. Ma, A. Luna, J. Rocabert, R. Muñoz, F. Córcoles, P. Rodríguez
In order to improve the connected current and the response speed of the controller, stationary reference frame control strategy with proportional resonant (P-R) controller due to its high dynamic and good harmonic compensation performance characteristics was already used in many different DG applications. This paper introduced an additional stationary reference frame control strategies with voltage feed-forward method. By using this method, both the quality of grid connected current and the dynamic performance are improved, which also validated by experiments.
{"title":"Voltage feed-forward performance in stationary reference frame controllers for wind power applications","authors":"L. Ma, A. Luna, J. Rocabert, R. Muñoz, F. Córcoles, P. Rodríguez","doi":"10.1109/POWERENG.2011.6036416","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036416","url":null,"abstract":"In order to improve the connected current and the response speed of the controller, stationary reference frame control strategy with proportional resonant (P-R) controller due to its high dynamic and good harmonic compensation performance characteristics was already used in many different DG applications. This paper introduced an additional stationary reference frame control strategies with voltage feed-forward method. By using this method, both the quality of grid connected current and the dynamic performance are improved, which also validated by experiments.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"417 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115983981","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036480
Francisco G. Benitez-Rios, F. García-Lagos, G. Joya, M. Atencia, F. Sandoval
In this paper the distributed generation impact on the stability and control of power distribution networks is analyzed from the point of view of voltage limits and power losses. The analysis allows us to propose control actions optimizing the operation of a radial distribution network using elements such as transformers, capacitor banks and the distributed generation units themselves. We also propose a new algorithm to be incorporated into the current Distribution Management System in order to maximize the penetration of distributed generation while maintaining the technical safety levels.
{"title":"Optimization of distributed generation penetration in distributed power electric systems","authors":"Francisco G. Benitez-Rios, F. García-Lagos, G. Joya, M. Atencia, F. Sandoval","doi":"10.1109/POWERENG.2011.6036480","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036480","url":null,"abstract":"In this paper the distributed generation impact on the stability and control of power distribution networks is analyzed from the point of view of voltage limits and power losses. The analysis allows us to propose control actions optimizing the operation of a radial distribution network using elements such as transformers, capacitor banks and the distributed generation units themselves. We also propose a new algorithm to be incorporated into the current Distribution Management System in order to maximize the penetration of distributed generation while maintaining the technical safety levels.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122810386","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036523
Fengxiang Wang, J. Pan, Yue Zhang, Xiaofeng Cai, Yanxuan Liu, Chen Li, J. Du
The design feature and performance analysis based on circuit-field coupled finite element analysis of large scale direct-driven permanent magnet (PM) generators are introduced. Some experimental results are presented. The simulation and experimental results of a 1.5MW PM wind generator show that the pole-slot number combination has an important impact on the machine properties, and the optimization of PM's dimension is significant to the performance as well the cost of the direct-driven PM wind generator.
{"title":"Design and performance of large scale direct-driven permanent magnet wind generators","authors":"Fengxiang Wang, J. Pan, Yue Zhang, Xiaofeng Cai, Yanxuan Liu, Chen Li, J. Du","doi":"10.1109/POWERENG.2011.6036523","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036523","url":null,"abstract":"The design feature and performance analysis based on circuit-field coupled finite element analysis of large scale direct-driven permanent magnet (PM) generators are introduced. Some experimental results are presented. The simulation and experimental results of a 1.5MW PM wind generator show that the pole-slot number combination has an important impact on the machine properties, and the optimization of PM's dimension is significant to the performance as well the cost of the direct-driven PM wind generator.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124649708","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036463
N. Shirdel, A. Akbari, H. Mirzaei, M. S. Abrishamian
Partial discharge in transformer can be detected and localized on-line using UHF technique. The first step for achieving this goal particularly the PD localizing is creation of simulation environment. In this paper three dimensional simulation is done using the FDTD method. The created simulation environment by FDTD was compared with CST software. The results of the two simulation environment had a good match with together. Consideration of the transformer active part is the feature of this simulation. Simulation results show that UHF electromagnetic (EM) waves can transmit from the radial ducts width between adjacent coils of high voltage winding. It was observed that the energy of received signal is proportional the oil duct width. Also it was observed that if the PD current pulse is steeper, signal energy and peak of the received signal would be reduced.
{"title":"Three-dimensional simulation of UHF signal propagation in transformer using FDTD method","authors":"N. Shirdel, A. Akbari, H. Mirzaei, M. S. Abrishamian","doi":"10.1109/POWERENG.2011.6036463","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036463","url":null,"abstract":"Partial discharge in transformer can be detected and localized on-line using UHF technique. The first step for achieving this goal particularly the PD localizing is creation of simulation environment. In this paper three dimensional simulation is done using the FDTD method. The created simulation environment by FDTD was compared with CST software. The results of the two simulation environment had a good match with together. Consideration of the transformer active part is the feature of this simulation. Simulation results show that UHF electromagnetic (EM) waves can transmit from the radial ducts width between adjacent coils of high voltage winding. It was observed that the energy of received signal is proportional the oil duct width. Also it was observed that if the PD current pulse is steeper, signal energy and peak of the received signal would be reduced.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128504889","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036545
B. Gholizad, M. Akhbari
Electrified Traction systems cause power quality problems in their power supply system. This is mainly due to the power electronic converters of traction system drives and their single phase operation. The created harmonics and unbalance currents are propagated in the upstream electrical network. Also, the created harmonics put the power quality of the traction system in danger. In this paper the traction system load is characterized, an algorithm for compensating simultaneously the both harmonics and load unbalances, and a topology of Hybrid Active Power Filter (HAFP) for improving of power quality in upstream network and the traction system is presented. The proposed algorithm can be adapted to any traction transformer connections / configurations. Besides, the load side compensation is used which reduces the cost of installations. And the proposed topology caused reducing the size of the Active Power Filter (APF). The topology is successfully tested under normal operation and load change conditions. The simulation results show the good performance of the algorithm under non-stiff supply network as well.
{"title":"A topology of Hybrid Active Power Filter for simultaneously compensating harmonics and load unbalance in single phase traction systems","authors":"B. Gholizad, M. Akhbari","doi":"10.1109/POWERENG.2011.6036545","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036545","url":null,"abstract":"Electrified Traction systems cause power quality problems in their power supply system. This is mainly due to the power electronic converters of traction system drives and their single phase operation. The created harmonics and unbalance currents are propagated in the upstream electrical network. Also, the created harmonics put the power quality of the traction system in danger. In this paper the traction system load is characterized, an algorithm for compensating simultaneously the both harmonics and load unbalances, and a topology of Hybrid Active Power Filter (HAFP) for improving of power quality in upstream network and the traction system is presented. The proposed algorithm can be adapted to any traction transformer connections / configurations. Besides, the load side compensation is used which reduces the cost of installations. And the proposed topology caused reducing the size of the Active Power Filter (APF). The topology is successfully tested under normal operation and load change conditions. The simulation results show the good performance of the algorithm under non-stiff supply network as well.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127264656","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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