Pub Date : 2011-10-01DOI: 10.1109/EPQU.2011.6128810
P. Drábek
Power electronic converters produce not only characteristic harmonics, but also both non-characteristic harmonics and interharmonics. This paper presents the physical background of both non-characteristic harmonics and interharmonics. Generation causes are explored and discussed in detail. Extensive series of simulation of different power converter topologies are provided and compared with experimental results and existing standards. This research offers missing background for standards covering low-frequency EMC.
{"title":"Harmonics of power electronic converters","authors":"P. Drábek","doi":"10.1109/EPQU.2011.6128810","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128810","url":null,"abstract":"Power electronic converters produce not only characteristic harmonics, but also both non-characteristic harmonics and interharmonics. This paper presents the physical background of both non-characteristic harmonics and interharmonics. Generation causes are explored and discussed in detail. Extensive series of simulation of different power converter topologies are provided and compared with experimental results and existing standards. This research offers missing background for standards covering low-frequency EMC.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115912355","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128917
M. Marzband, A. Sumper, O. Gomis‐Bellmunt, Paola Pezzini, M. Chindris
This paper presents a new application of fuzzy logic (FL) to1 an isolated network with a High Penetration, no-storage wind-diesel (HPNSWD) system. As a result of a study referring the behavior of an isolated electric system facing frequency disturbances, a fuzzy logic controller (FLC) was developed to improve the system´s dynamic performance. The validity of the proposed controller is evaluated by computer analysis using MATLAB/SIMULINK. The simulation results demonstrated that a small-scale wind turbine generation unit can be freely operated in an isolated distribution network without creating violation in power balance and voltage profile. The effectiveness of the fuzzy logic controller is then compared with that of a proportional-integral-and differential (PID) controller.
{"title":"Frequency control of isolated wind and diesel hybrid MicroGrid power system by using fuzzy logic controllers and PID controllers","authors":"M. Marzband, A. Sumper, O. Gomis‐Bellmunt, Paola Pezzini, M. Chindris","doi":"10.1109/EPQU.2011.6128917","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128917","url":null,"abstract":"This paper presents a new application of fuzzy logic (FL) to1 an isolated network with a High Penetration, no-storage wind-diesel (HPNSWD) system. As a result of a study referring the behavior of an isolated electric system facing frequency disturbances, a fuzzy logic controller (FLC) was developed to improve the system´s dynamic performance. The validity of the proposed controller is evaluated by computer analysis using MATLAB/SIMULINK. The simulation results demonstrated that a small-scale wind turbine generation unit can be freely operated in an isolated distribution network without creating violation in power balance and voltage profile. The effectiveness of the fuzzy logic controller is then compared with that of a proportional-integral-and differential (PID) controller.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127425245","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128921
M. Antchev, M. Petkova, H. Antchev, Vanjo Gourgoulitsov, S. Valtchev
The paper presents results from a study of a series-connected single-phase active power filter (APF) with a control system based on modified hysteresis method. Waveforms from the computer simulation and waveforms from the experimental tests of the filter are presented, operating at limited and unlimited maximum switching frequency.
{"title":"Study of a single-phase series active power filter with hysteresis control","authors":"M. Antchev, M. Petkova, H. Antchev, Vanjo Gourgoulitsov, S. Valtchev","doi":"10.1109/EPQU.2011.6128921","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128921","url":null,"abstract":"The paper presents results from a study of a series-connected single-phase active power filter (APF) with a control system based on modified hysteresis method. Waveforms from the computer simulation and waveforms from the experimental tests of the filter are presented, operating at limited and unlimited maximum switching frequency.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127457919","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128832
R. Pérez-Martínez, R. Villafáfila-Robles, P. Lloret-Gallego, A. Egea-Àlvarez, A. Sumper, Angel Silos-Sanchez
Remote laboratories are a learning tool that allows carrying out tutorials without being physically present in the laboratory facilities. Such sort of platforms can be useful to complement student's learning with some practical activities. Timetables flexibility is the main advantage of remote laboratories for both students and teachers, since these laboratories are in operation 24 hours per day without requiring any supervisory assistance. The protection and distribution power systems have recently changed by the effect of the new information and communication technologies. As these changes have been carried out in such a short period of time, professionals with knowledge in these topics are required. Additionally it would be needed to include distribution automation concepts in current subjects and finally create didactic material to be used in practical sessions. This paper presents an e-laboratory of electrical protections that emulates the structure and conditions of a distribution grid. This laboratory is used to perform practical activities in degree and master subjects and professional courses dealing with electrical protections, automation and communications.
{"title":"Protection system remote laboratory","authors":"R. Pérez-Martínez, R. Villafáfila-Robles, P. Lloret-Gallego, A. Egea-Àlvarez, A. Sumper, Angel Silos-Sanchez","doi":"10.1109/EPQU.2011.6128832","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128832","url":null,"abstract":"Remote laboratories are a learning tool that allows carrying out tutorials without being physically present in the laboratory facilities. Such sort of platforms can be useful to complement student's learning with some practical activities. Timetables flexibility is the main advantage of remote laboratories for both students and teachers, since these laboratories are in operation 24 hours per day without requiring any supervisory assistance. The protection and distribution power systems have recently changed by the effect of the new information and communication technologies. As these changes have been carried out in such a short period of time, professionals with knowledge in these topics are required. Additionally it would be needed to include distribution automation concepts in current subjects and finally create didactic material to be used in practical sessions. This paper presents an e-laboratory of electrical protections that emulates the structure and conditions of a distribution grid. This laboratory is used to perform practical activities in degree and master subjects and professional courses dealing with electrical protections, automation and communications.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"C-25 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132624243","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128840
H. Talaat, E. Al-Ammar
This paper addresses the optimization problem of integration of Distributed Generation (DG) in distribution networks. Three Genetic Algorithms (GAs) have been developed to minimize the power losses of the system. The First GA enables the optimal sizing of the DG units given their locations. Alternatively, the second GA determines the optimal locations of the DG units assuming equal sizes of the units. The third GA enables the determination of both optimal sizes, on discrete values, and optimal locations. The results prove the effectiveness of the developed genetic algorithms in finding the optimal penetration level and optimal locations and sizes of the DG units to yield minimum losses of the system.
{"title":"Optimal allocation and sizing of Distributed Generation in distribution networks using Genetic Algorithms","authors":"H. Talaat, E. Al-Ammar","doi":"10.1109/EPQU.2011.6128840","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128840","url":null,"abstract":"This paper addresses the optimization problem of integration of Distributed Generation (DG) in distribution networks. Three Genetic Algorithms (GAs) have been developed to minimize the power losses of the system. The First GA enables the optimal sizing of the DG units given their locations. Alternatively, the second GA determines the optimal locations of the DG units assuming equal sizes of the units. The third GA enables the determination of both optimal sizes, on discrete values, and optimal locations. The results prove the effectiveness of the developed genetic algorithms in finding the optimal penetration level and optimal locations and sizes of the DG units to yield minimum losses of the system.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130462227","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128883
H. Carneiro, B. Exposto, J. Afonso
This paper presents an evaluation of the performance of two different Positive-Sequence Detectors. This evaluation is made by comparing a PLL (Phase-Locked-Loop), combined with Lagrange Multipliers Method, with an Adaptive Filter. Both algorithms aim to detect the positive sequence at the fundamental frequency on a given three-phase system voltages or currents. The purpose of this evaluation is to assess the better Positive-Sequence Detector for custom power devices, such as Active Power Filters. The comparative analysis was based on the evaluation of a series of steady state performance parameters (phase and amplitude errors, THD and unbalance) and on the response time. The tests were made to study the behavior of both approaches when working with highly distorted and unbalanced signals. This work was carried out using the computer simulation tool PSCAD/EMTDC.
{"title":"Evaluation of two fundamental Positive-Sequence Detectors for highly distorted and unbalanced systems","authors":"H. Carneiro, B. Exposto, J. Afonso","doi":"10.1109/EPQU.2011.6128883","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128883","url":null,"abstract":"This paper presents an evaluation of the performance of two different Positive-Sequence Detectors. This evaluation is made by comparing a PLL (Phase-Locked-Loop), combined with Lagrange Multipliers Method, with an Adaptive Filter. Both algorithms aim to detect the positive sequence at the fundamental frequency on a given three-phase system voltages or currents. The purpose of this evaluation is to assess the better Positive-Sequence Detector for custom power devices, such as Active Power Filters. The comparative analysis was based on the evaluation of a series of steady state performance parameters (phase and amplitude errors, THD and unbalance) and on the response time. The tests were made to study the behavior of both approaches when working with highly distorted and unbalanced signals. This work was carried out using the computer simulation tool PSCAD/EMTDC.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128120961","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128943
P. Bilik, J. Kvapil, S. Mišák
Supplying of separate isolated load systems such as street lighting can be realized by combination of wind and solar power. Hybrid power supply system consists of a number of independent and different sources of electrical energy with different operating times during different seasons and with energy storage system. Deployment of a hybrid power system is expected in places outside the normal distribution network. For the further research and improvements it is necessary to know in detail the power flow from various sources to the load or to storage battery depending on different seasons. The autonomous monitoring system with remote data transmission system has been developed to monitor the power flow between different blocks of the hybrid power system. The monitoring system also allows efficiency evaluation during various operating modes. The article describes among others the design and implementation of modular and open monitoring system based on virtual instrumentation. The main goal of the article is to describe practical results that can be used to optimize the hybrid power system design in the near future.
{"title":"Efficiency and internal power flow of renewable power supply system","authors":"P. Bilik, J. Kvapil, S. Mišák","doi":"10.1109/EPQU.2011.6128943","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128943","url":null,"abstract":"Supplying of separate isolated load systems such as street lighting can be realized by combination of wind and solar power. Hybrid power supply system consists of a number of independent and different sources of electrical energy with different operating times during different seasons and with energy storage system. Deployment of a hybrid power system is expected in places outside the normal distribution network. For the further research and improvements it is necessary to know in detail the power flow from various sources to the load or to storage battery depending on different seasons. The autonomous monitoring system with remote data transmission system has been developed to monitor the power flow between different blocks of the hybrid power system. The monitoring system also allows efficiency evaluation during various operating modes. The article describes among others the design and implementation of modular and open monitoring system based on virtual instrumentation. The main goal of the article is to describe practical results that can be used to optimize the hybrid power system design in the near future.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132258221","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128828
P. Rezende, J. C. de Oliveira, I. N. Gondim, I. A. Bacca
This paper is aimed at proposing and validating a time domain model for window-type air conditioner apparatus and corresponding insertion in the ATPDraw platform. The suggested computational model performance exactness is evaluated through comparison of simulation and experimental results with ideal and non-ideal supply voltage conditions. Once the representation effectiveness is proven, the model is then implemented in a more comprehensive program developed to cope with the dielectric and thermal relationship between system disturbances and appliance's supportability limits. This tool has been developed so as to provide a scientific and systematized way of analyzing consumer refunding demands to equipment damages eventually attributed to distribution system occurrences. A practical study is then carried out to highlight the overall software application considered here.
{"title":"Air conditioner ATP time domain model and validation focusing reimbursement requests associated with system disturbances","authors":"P. Rezende, J. C. de Oliveira, I. N. Gondim, I. A. Bacca","doi":"10.1109/EPQU.2011.6128828","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128828","url":null,"abstract":"This paper is aimed at proposing and validating a time domain model for window-type air conditioner apparatus and corresponding insertion in the ATPDraw platform. The suggested computational model performance exactness is evaluated through comparison of simulation and experimental results with ideal and non-ideal supply voltage conditions. Once the representation effectiveness is proven, the model is then implemented in a more comprehensive program developed to cope with the dielectric and thermal relationship between system disturbances and appliance's supportability limits. This tool has been developed so as to provide a scientific and systematized way of analyzing consumer refunding demands to equipment damages eventually attributed to distribution system occurrences. A practical study is then carried out to highlight the overall software application considered here.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133006004","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128898
U. Ribes-Mallada, R. Leyva, P. Garces
The paper describes important design requirements for dc-dc converter design and, particularly, it shows these constraints in a boost converter and in a cascade-boost converter. There exist several approaches to find the optimal design. Nevertheless, these methods do not provide a sensitivity analysis to carry out the usual post-processing task in an optimization process. The paper analyses in a graphical way the influence of small perturbations, in the design constraints, that affect the optimal performances. In addition, the proposed analysis verifies that the design is optimal. The results are expected to enable the engineer to gain useful insights into the design process and guide him/her in implementing more efficient dc-dc converters.
{"title":"Sensitivity analysis in boost converters optimal design","authors":"U. Ribes-Mallada, R. Leyva, P. Garces","doi":"10.1109/EPQU.2011.6128898","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128898","url":null,"abstract":"The paper describes important design requirements for dc-dc converter design and, particularly, it shows these constraints in a boost converter and in a cascade-boost converter. There exist several approaches to find the optimal design. Nevertheless, these methods do not provide a sensitivity analysis to carry out the usual post-processing task in an optimization process. The paper analyses in a graphical way the influence of small perturbations, in the design constraints, that affect the optimal performances. In addition, the proposed analysis verifies that the design is optimal. The results are expected to enable the engineer to gain useful insights into the design process and guide him/her in implementing more efficient dc-dc converters.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"17 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113979624","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 : 2011-10-01DOI: 10.1109/EPQU.2011.6128870
J. Delgado, Bruno F. Santos, A. D. de Almeida, Agostinho Figueira
Due to the electricity increase consumption in recent decades, the rising price of fossil energy and uncertainty associated with its supply, there has been a growing concern for energy efficiency and the exploration of endogenous renewable energy sources. These changes are intended to promote greater security in supply, to reduce energy bills as well as greenhouse gas emissions. If this effort make sense anywhere, it is even more significant in islands where conventional primary energy is considerably more expensive. Given the intermittence of renewable sources such as solar and wind, it becomes essential to search for effective solutions to integrate them into the grid. This work describes the methodology for choosing an effective solution for the integration of intermittent generation in the island of Porto Santo.
{"title":"Solutions to mitigate power quality disturbances resulting from integrating intermittent renewable energy in the grid of Porto Santo","authors":"J. Delgado, Bruno F. Santos, A. D. de Almeida, Agostinho Figueira","doi":"10.1109/EPQU.2011.6128870","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128870","url":null,"abstract":"Due to the electricity increase consumption in recent decades, the rising price of fossil energy and uncertainty associated with its supply, there has been a growing concern for energy efficiency and the exploration of endogenous renewable energy sources. These changes are intended to promote greater security in supply, to reduce energy bills as well as greenhouse gas emissions. If this effort make sense anywhere, it is even more significant in islands where conventional primary energy is considerably more expensive. Given the intermittence of renewable sources such as solar and wind, it becomes essential to search for effective solutions to integrate them into the grid. This work describes the methodology for choosing an effective solution for the integration of intermittent generation in the island of Porto Santo.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128797077","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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