Pub Date : 2011-05-11DOI: 10.1109/POWERENG.2011.6036420
A. Luna, D. Aguilar, R. Muñoz-Aguilar, F. Córcoles, P. Rodríguez
The wind turbines based on Doubly Fed Induction Generators (DFIG) represent almost the 60% of the installed windpower worldwide. Nowadays most of the existing algorithms, used for regulating the production of active and reactive power in such systems, are based on control techniques that use rotational reference frames theories, where the dqO is maybe the most popular. Despite of its good operation under balanced conditions its behaviour depends on a good phase synchronization, otherwise the different transformations cannot be performed with enough guarantees. Of course this kind of response is becomming insuficient, as far as the windpower penetration is increasing. This paper will present a new control topology for DFIG, that are connected using back to back inverters, that is able to behave better in case of faulty grids. Besides some proposals for improving the operation of the DFIG will be presented as well. The aim of that part is to extend the possibilities that the back to back inverters are able to offer to the generator system by means of including new functionalities, as the active filtering capability or the reduction of the flicker emission that will be later discussed.
{"title":"Control proposals for the operation of power converters in wind power systems","authors":"A. Luna, D. Aguilar, R. Muñoz-Aguilar, F. Córcoles, P. Rodríguez","doi":"10.1109/POWERENG.2011.6036420","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036420","url":null,"abstract":"The wind turbines based on Doubly Fed Induction Generators (DFIG) represent almost the 60% of the installed windpower worldwide. Nowadays most of the existing algorithms, used for regulating the production of active and reactive power in such systems, are based on control techniques that use rotational reference frames theories, where the dqO is maybe the most popular. Despite of its good operation under balanced conditions its behaviour depends on a good phase synchronization, otherwise the different transformations cannot be performed with enough guarantees. Of course this kind of response is becomming insuficient, as far as the windpower penetration is increasing. This paper will present a new control topology for DFIG, that are connected using back to back inverters, that is able to behave better in case of faulty grids. Besides some proposals for improving the operation of the DFIG will be presented as well. The aim of that part is to extend the possibilities that the back to back inverters are able to offer to the generator system by means of including new functionalities, as the active filtering capability or the reduction of the flicker emission that will be later discussed.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"50 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":"125908283","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.2011.6036474
F. G. Montoya, A. Alcayde, P. Sánchez, J. Gómez, F. Martin
In this paper, a new open source project focused on power quality assessment and monitoring for low voltage power systems is presented. Power quality (PQ) is a crucial matter for proper and reliable operation of industrial or home electrical appliances. In order to improve PQ techniques, efforts are made to develop smart sensors that can report near real-time data. Proprietary software and hardware on dedicated computers or servers processes these data and shows relevant information through tables or graphics. In this situation, interoperability, compatibility and scalability are not possible because of the lack of open protocols. In our work, we introduce zEnergy, an open source platform for computing, storing and managing all of the information generated from smart sensors. We apply the most up-to-date algorithms developed for power quality, event detection, and harmonic analysis or power metering. zEnergy makes use of cutting-edge web technologies such as HTML5, CSS3 and Javascript to provide user-friendly interaction and powerful capabilities for the analysis, measurement and monitoring of power systems. All software used in our work is open source, running on Linux.
{"title":"zEnergy: An open source project for power quality assessment and monitoring","authors":"F. G. Montoya, A. Alcayde, P. Sánchez, J. Gómez, F. Martin","doi":"10.1109/POWERENG.2011.6036474","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036474","url":null,"abstract":"In this paper, a new open source project focused on power quality assessment and monitoring for low voltage power systems is presented. Power quality (PQ) is a crucial matter for proper and reliable operation of industrial or home electrical appliances. In order to improve PQ techniques, efforts are made to develop smart sensors that can report near real-time data. Proprietary software and hardware on dedicated computers or servers processes these data and shows relevant information through tables or graphics. In this situation, interoperability, compatibility and scalability are not possible because of the lack of open protocols. In our work, we introduce zEnergy, an open source platform for computing, storing and managing all of the information generated from smart sensors. We apply the most up-to-date algorithms developed for power quality, event detection, and harmonic analysis or power metering. zEnergy makes use of cutting-edge web technologies such as HTML5, CSS3 and Javascript to provide user-friendly interaction and powerful capabilities for the analysis, measurement and monitoring of power systems. All software used in our work is open source, running on Linux.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"5 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":"125285184","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.2011.6036439
A. Ranjbar, M. Kiani, B. Fahimi
In this paper, existing methods for reliability evaluation of power electronic systems at system level are reviewed. Then Dynamic Markov Model (DMM) for reliability evaluation of power electronic system is proposed to solve the shortcomings associated with the existing methods. In order to show the effectiveness of the proposed method, reliability of a Boost Power Factor Correction (PFC) circuit is evaluated. To show the advantage of the proposed method, DMM is compared with the conventional Markov model. Based on the comparison results it is shown that DMM can result in a more trustable metric value for reliability of the system.
本文对现有的电力电子系统可靠性评估方法进行了综述。针对现有方法的不足，提出了电力电子系统可靠性评估的动态马尔可夫模型(DMM)。为了证明该方法的有效性，对升压功率因数校正(Boost Power Factor Correction, PFC)电路的可靠性进行了评估。为了证明该方法的优越性，将DMM模型与传统的马尔可夫模型进行了比较。对比结果表明，DMM可以得到更可靠的系统可靠性度量值。
{"title":"Dynamic Markov Model for reliability evaluation of power electronic systems","authors":"A. Ranjbar, M. Kiani, B. Fahimi","doi":"10.1109/POWERENG.2011.6036439","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036439","url":null,"abstract":"In this paper, existing methods for reliability evaluation of power electronic systems at system level are reviewed. Then Dynamic Markov Model (DMM) for reliability evaluation of power electronic system is proposed to solve the shortcomings associated with the existing methods. In order to show the effectiveness of the proposed method, reliability of a Boost Power Factor Correction (PFC) circuit is evaluated. To show the advantage of the proposed method, DMM is compared with the conventional Markov model. Based on the comparison results it is shown that DMM can result in a more trustable metric value for reliability of the system.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"26 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":"128095675","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.2011.6036524
S. Naidu, D. Fernandes, K. P. Medeiros
A simple algorithm to control the PWM rectifier has been presented. Harmonics and unbalance in the AC-side line currents are compensated and the DC-bus voltage is regulated. The power factor of the compensated line currents is high. The algorithm may be used unmodified to control an active power filter. Simulation and experimental results have been presented to validate the control technique.
{"title":"Simplified control of a three-phase PWM rectifier","authors":"S. Naidu, D. Fernandes, K. P. Medeiros","doi":"10.1109/POWERENG.2011.6036524","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036524","url":null,"abstract":"A simple algorithm to control the PWM rectifier has been presented. Harmonics and unbalance in the AC-side line currents are compensated and the DC-bus voltage is regulated. The power factor of the compensated line currents is high. The algorithm may be used unmodified to control an active power filter. Simulation and experimental results have been presented to validate the control technique.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"15 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":"133063208","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.2011.6036520
R. Gregor, J. Balsevich, B. Bogado
This paper deals with the speed control of asymmetrical dual three-phase induction machines by using an inner loop of Predictive Current Control based on the Model (MBPC). The MBPC is obtained from the mathematical model of the drive, using a state-space representation, where the two states variables are the stator and rotor currents, respectively. In electrical drive applications, the rotor current is a non-measured parameter, so it is estimated using a reduced order estimator based on a Luenberger observer. Finally, simulation results are provided to examine the efficiency of the proposed control algorithm.
{"title":"Reduced-order observer for rotor current estimation in speed control of dual-three phase induction machine","authors":"R. Gregor, J. Balsevich, B. Bogado","doi":"10.1109/POWERENG.2011.6036520","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036520","url":null,"abstract":"This paper deals with the speed control of asymmetrical dual three-phase induction machines by using an inner loop of Predictive Current Control based on the Model (MBPC). The MBPC is obtained from the mathematical model of the drive, using a state-space representation, where the two states variables are the stator and rotor currents, respectively. In electrical drive applications, the rotor current is a non-measured parameter, so it is estimated using a reduced order estimator based on a Luenberger observer. Finally, simulation results are provided to examine the efficiency of the proposed control algorithm.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"102 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":"128129985","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.2011.6036476
F. Karimzadeh, A. Akbari, M. Ardebili
Dryformer is an oil-free power transformer that its windings are made of high voltage cross-linked polyethylene (XLPE) cables. Leakage reactance calculation is a key step in transformer design process. Special structure of Dryformer makes conventional analytical methods useless for leakage reactance calculation in this type of transformer. In this paper, an analytical method is proposed for calculating leakage reactance of Dryformer based on its winding structure. The validity of proposed model is verified by means of 3D and 2D finite element models.
{"title":"Calculating Dryformer leakage reactance using analytical and finite element methods","authors":"F. Karimzadeh, A. Akbari, M. Ardebili","doi":"10.1109/POWERENG.2011.6036476","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036476","url":null,"abstract":"Dryformer is an oil-free power transformer that its windings are made of high voltage cross-linked polyethylene (XLPE) cables. Leakage reactance calculation is a key step in transformer design process. Special structure of Dryformer makes conventional analytical methods useless for leakage reactance calculation in this type of transformer. In this paper, an analytical method is proposed for calculating leakage reactance of Dryformer based on its winding structure. The validity of proposed model is verified by means of 3D and 2D finite element models.","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":"129202548","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}
Pub Date : 2011-05-11DOI: 10.1109/POWERENG.2011.6036497
J. I. Leon, L. Franquelo, S. Kouro, Bin Wu, S. Vazquez
Among the multilevel converters present in the industry, the hybrid flying-capacitor based active-neutral-point-clamped converter is very recent. It presents good features such as high quality output voltage, high modularity and easy extension to achieve a high number of levels with reduced number of power devices. This paper introduces a simple modulator for the single-phase two-cell hybrid flying-capacitor based active-neutral-point-clamped converter. The modulation technique is based on the determination of a switching sequence formed by two switching states which generate the two nearest voltage levels to the reference phase voltage. Some extra calculations are added to the modulation method to control the dc-link capacitors and the floating capacitor voltages. The computational cost of the modulation technique is low only including simple comparisons and mathematical expressions. Simulation results show the high quality output voltages and currents including the dc voltage control.
{"title":"Novel modulator for the hybrid two-cell flying-capacitor based ANPC converter","authors":"J. I. Leon, L. Franquelo, S. Kouro, Bin Wu, S. Vazquez","doi":"10.1109/POWERENG.2011.6036497","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036497","url":null,"abstract":"Among the multilevel converters present in the industry, the hybrid flying-capacitor based active-neutral-point-clamped converter is very recent. It presents good features such as high quality output voltage, high modularity and easy extension to achieve a high number of levels with reduced number of power devices. This paper introduces a simple modulator for the single-phase two-cell hybrid flying-capacitor based active-neutral-point-clamped converter. The modulation technique is based on the determination of a switching sequence formed by two switching states which generate the two nearest voltage levels to the reference phase voltage. Some extra calculations are added to the modulation method to control the dc-link capacitors and the floating capacitor voltages. The computational cost of the modulation technique is low only including simple comparisons and mathematical expressions. Simulation results show the high quality output voltages and currents including the dc voltage control.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"64 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":"130980920","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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