Pub Date : 2011-10-01DOI: 10.1109/EPQU.2011.6128885
J. Buchta, A. Oziemski
The paper presents results of reliability forecasting for domestic, technologically congener power units rated at 370 MW operating in Belchatow Power Plant and Opole Power Plant as lignite fired and hard coal fired respectively. Estimation of parameters for identified empirical probability distribution functions of operation time and repair time was done by the method of a histogram with a set number of observations in each class. The study includes expected values of reliability indices calculated for main generating installations of both unit types.
{"title":"Estimation of reliability indices of power machinery in 370 MW rated power units operating in polish power system","authors":"J. Buchta, A. Oziemski","doi":"10.1109/EPQU.2011.6128885","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128885","url":null,"abstract":"The paper presents results of reliability forecasting for domestic, technologically congener power units rated at 370 MW operating in Belchatow Power Plant and Opole Power Plant as lignite fired and hard coal fired respectively. Estimation of parameters for identified empirical probability distribution functions of operation time and repair time was done by the method of a histogram with a set number of observations in each class. The study includes expected values of reliability indices calculated for main generating installations of both unit types.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"25 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":"121415247","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.2011.6128941
L. Koleva, D. Taskovski, V. Dimcev
In this paper the influence of different wavelet filters on the harmonic analysis of power system waveforms is investigated. For this aim, wavelet packet transform-based algorithm for rms measurement is implemented. Besides commonly used Daubechies filters, Vaidyanathan with 24 coefficients and Coiflets the influence of several Johnston's filters with different characteristics is examined. Experimental tests are performed under different conditions, in case of stationary signals with different harmonics components and in case of non-stationary harmonics distortion. Experimental results show that Johnston's filters outperform the commonly used wavelet filters for harmonic analysis.
{"title":"Measurement of power systems harmonics using QMF filter banks","authors":"L. Koleva, D. Taskovski, V. Dimcev","doi":"10.1109/EPQU.2011.6128941","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128941","url":null,"abstract":"In this paper the influence of different wavelet filters on the harmonic analysis of power system waveforms is investigated. For this aim, wavelet packet transform-based algorithm for rms measurement is implemented. Besides commonly used Daubechies filters, Vaidyanathan with 24 coefficients and Coiflets the influence of several Johnston's filters with different characteristics is examined. Experimental tests are performed under different conditions, in case of stationary signals with different harmonics components and in case of non-stationary harmonics distortion. Experimental results show that Johnston's filters outperform the commonly used wavelet filters for harmonic analysis.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"124 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":"114554386","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.2011.6128913
M. Marzband, A. Sumper, O. Gomis‐Bellmunt, A. Sudriá-Andreu, M. Chindris
The paper aims modeling and simulating a wind turbine and its induction generator (WTIG) system as an electricity source in the power networks. System simulation has been done using the facilities offered by MATLAB/SIMULINK software. At first, equivalent models of various parts of a wind turbine generation system (WTGS) with fixed speed wind turbine (FSWT) are presented, and then an equivalent model of a wind turbine that operates in a grid connected mode is achieved by integrating these sub-models. The proposed equivalent models provide high accuracy for representing the dynamic response of wind power generation systems (WPGS) and can be used for power system simulations. Likewise, the analysis of the reactive power management of a WTGS consisting of FSWTs is carried out by using a static synchronous compensator (STATCOM). Regarding this matter, the rating calculation of the compensator for a FSWT is performed, and the effect of the network strength on the compensator rating is studied. Furthermore, the compatibility of FSWT with the mathematical models is evaluated by using simulation in MATLAB/SIMULINK environment.
{"title":"Modeling and simulation of the fixed speed wind power generation system for grid studies","authors":"M. Marzband, A. Sumper, O. Gomis‐Bellmunt, A. Sudriá-Andreu, M. Chindris","doi":"10.1109/EPQU.2011.6128913","DOIUrl":"https://doi.org/10.1109/EPQU.2011.6128913","url":null,"abstract":"The paper aims modeling and simulating a wind turbine and its induction generator (WTIG) system as an electricity source in the power networks. System simulation has been done using the facilities offered by MATLAB/SIMULINK software. At first, equivalent models of various parts of a wind turbine generation system (WTGS) with fixed speed wind turbine (FSWT) are presented, and then an equivalent model of a wind turbine that operates in a grid connected mode is achieved by integrating these sub-models. The proposed equivalent models provide high accuracy for representing the dynamic response of wind power generation systems (WPGS) and can be used for power system simulations. Likewise, the analysis of the reactive power management of a WTGS consisting of FSWTs is carried out by using a static synchronous compensator (STATCOM). Regarding this matter, the rating calculation of the compensator for a FSWT is performed, and the effect of the network strength on the compensator rating is studied. Furthermore, the compatibility of FSWT with the mathematical models is evaluated by using simulation in MATLAB/SIMULINK environment.","PeriodicalId":369941,"journal":{"name":"11th International Conference on Electrical Power Quality and Utilisation","volume":"1 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":"129290157","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.2011.6128917
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.2011.6128898
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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