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.2011.6036480
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.2011.6036416
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.2011.6036419
P. Lobato, J. Martins, A. Pires
In order to improve the dynamic performance of a Switched Reluctance Generator (SRG), strategies that reduce the machine torque ripple are required. This paper discusses the effect of the number of stator and rotor poles on the SRG design. A criteria, based on machine parameters and geometry symmetries, is defined to point optimal SR topologies for an effective torque ripple reduction. From a trapezoidal phase torque reference a magnetomotriz force is imposed and synchronised with the rotor position, in conjunction with a suitable design of the SR machine, to minimize torque ripple while maintaining the high average torque during the generating operation.
{"title":"A design criteria for torque ripple reduction in Switched Reluctance Generators","authors":"P. Lobato, J. Martins, A. Pires","doi":"10.1109/POWERENG.2011.6036419","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036419","url":null,"abstract":"In order to improve the dynamic performance of a Switched Reluctance Generator (SRG), strategies that reduce the machine torque ripple are required. This paper discusses the effect of the number of stator and rotor poles on the SRG design. A criteria, based on machine parameters and geometry symmetries, is defined to point optimal SR topologies for an effective torque ripple reduction. From a trapezoidal phase torque reference a magnetomotriz force is imposed and synchronised with the rotor position, in conjunction with a suitable design of the SR machine, to minimize torque ripple while maintaining the high average torque during the generating operation.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"14 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":"116697198","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.2011.6036531
R. Cipín, M. Patočka, Jiří Vondruš
The paper deals with practical realization of the acceleration method for the torque-speed characteristics measurement of the tree-phase induction motor. Reached results are compared with the characteristics measured on the dynamometer. The authors propose to use B-splines for the processing of measured data Both their application and reached results are shown for the actual case. Further, the authors propose the measuring method of the moment of inertia of the rotor itself from the running up at the use of various numbers of additional flywheels.
{"title":"Acceleration method of the IM torque-speed characteristics measurement","authors":"R. Cipín, M. Patočka, Jiří Vondruš","doi":"10.1109/POWERENG.2011.6036531","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036531","url":null,"abstract":"The paper deals with practical realization of the acceleration method for the torque-speed characteristics measurement of the tree-phase induction motor. Reached results are compared with the characteristics measured on the dynamometer. The authors propose to use B-splines for the processing of measured data Both their application and reached results are shown for the actual case. Further, the authors propose the measuring method of the moment of inertia of the rotor itself from the running up at the use of various numbers of additional flywheels.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"4 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":"125569296","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.2011.6036442
S. Gort, H. D. Doran, K. Weber, N. Hennchen
The implementation of wind turbines lagged state-of-the-art control capabilities for many years. This paper describes a control system for wind turbines which incorporates the major control elements for running a wind turbine as well as ensuring that energy from the inverters is injected into the electricity network at maximum efficiency. The paper critically analyses the functional improvements and strategic limitations imposed by the communication system.
{"title":"Communication aspects of wind turbine control-architecture re-design","authors":"S. Gort, H. D. Doran, K. Weber, N. Hennchen","doi":"10.1109/POWERENG.2011.6036442","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036442","url":null,"abstract":"The implementation of wind turbines lagged state-of-the-art control capabilities for many years. This paper describes a control system for wind turbines which incorporates the major control elements for running a wind turbine as well as ensuring that energy from the inverters is injected into the electricity network at maximum efficiency. The paper critically analyses the functional improvements and strategic limitations imposed by the communication system.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"150 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":"125768973","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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