Pub Date : 2010-11-09DOI: 10.1109/ICHQP.2010.5625316
A. L. F. Ferreira Filho, J. Cormane, F. A. do Nascimento, Thais C. Valadares, J. P. de Oliveira
This article presents the results reached from voltage unbalance factor (VUF) calculations considering nine distinct forms for dealing with signals from voltage measurements. First, each signal processing method used in this article for quantifying unbalance is defined. Next, these methods are applied in computational simulations where there are sinusoidal waveforms with random unbalanced amplitudes. From this point, the extent to which differences among signal processing procedures have an impact on quantifying voltage unbalance is evaluated. Carrying out the investigations as proposed in this article is of the utmost importance for choosing, satisfactorily, indexes and norm limits that examine voltage unbalance.
{"title":"Quantifying voltage unbalance: Evaluating the influence of aggregation intervals","authors":"A. L. F. Ferreira Filho, J. Cormane, F. A. do Nascimento, Thais C. Valadares, J. P. de Oliveira","doi":"10.1109/ICHQP.2010.5625316","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625316","url":null,"abstract":"This article presents the results reached from voltage unbalance factor (VUF) calculations considering nine distinct forms for dealing with signals from voltage measurements. First, each signal processing method used in this article for quantifying unbalance is defined. Next, these methods are applied in computational simulations where there are sinusoidal waveforms with random unbalanced amplitudes. From this point, the extent to which differences among signal processing procedures have an impact on quantifying voltage unbalance is evaluated. Carrying out the investigations as proposed in this article is of the utmost importance for choosing, satisfactorily, indexes and norm limits that examine voltage unbalance.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"609 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116075352","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625446
M. Delfanti, D. Falabretti, Marco Merlo, G. Monfredini, V. Olivieri
The growing development of Dispersed Generation drives to a novel management of distribution networks in order to take advantages of this new form of generation. In particular the DG determines different power flows along distribution feeders modifying voltage profiles and fault levels and introducing new issues in protection systems. This paper addresses the issues of islanding of a portion of the medium voltage system in different operating conditions. The aim is to evaluate the most used passive methods performances, in particular with respect to the Italian anti-islanding protection systems. On the basis of the results new schemes will be proposed to reduce anti-islanding protection bad operation.
{"title":"Dispersed generation in MV networks: Performance of anti-islanding protections","authors":"M. Delfanti, D. Falabretti, Marco Merlo, G. Monfredini, V. Olivieri","doi":"10.1109/ICHQP.2010.5625446","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625446","url":null,"abstract":"The growing development of Dispersed Generation drives to a novel management of distribution networks in order to take advantages of this new form of generation. In particular the DG determines different power flows along distribution feeders modifying voltage profiles and fault levels and introducing new issues in protection systems. This paper addresses the issues of islanding of a portion of the medium voltage system in different operating conditions. The aim is to evaluate the most used passive methods performances, in particular with respect to the Italian anti-islanding protection systems. On the basis of the results new schemes will be proposed to reduce anti-islanding protection bad operation.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124745203","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625454
P. Caramia, P. Varilone, P. Verde, L. Vitale
Electrical power system robustness is defined as the intrinsic capacity of an electrical power system to maintain assigned disturbance levels when external conditions change. In this paper the concept of robustness against is applied to the voltage dips, one of the most severe disturbances in power quality. Using graphical color schemes as immediate tools, improvements and/or degradations of the electrical power system robustness are assessed when the structure of distribution system is modified. In particular, both substitutions of components (from overhead to cable lines) and installation of new components (connection of DG units) are considered as possible structure modifications. The proposed tools are applied to different study cases.
{"title":"On the robustness of the distribution systems against voltage dips: The analytical assessment for different structure variations","authors":"P. Caramia, P. Varilone, P. Verde, L. Vitale","doi":"10.1109/ICHQP.2010.5625454","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625454","url":null,"abstract":"Electrical power system robustness is defined as the intrinsic capacity of an electrical power system to maintain assigned disturbance levels when external conditions change. In this paper the concept of robustness against is applied to the voltage dips, one of the most severe disturbances in power quality. Using graphical color schemes as immediate tools, improvements and/or degradations of the electrical power system robustness are assessed when the structure of distribution system is modified. In particular, both substitutions of components (from overhead to cable lines) and installation of new components (connection of DG units) are considered as possible structure modifications. The proposed tools are applied to different study cases.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129593912","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625368
P. Kiss, G. G. Balázs, A. Dán, I. Schmidt
This paper presents how the PWM controlled AC locomotives are disturbing the electric network with harmonics.
本文介绍了PWM控制的交流机车对电网的谐波干扰。
{"title":"The application of the double domain simulation with PWM controlled locomotives","authors":"P. Kiss, G. G. Balázs, A. Dán, I. Schmidt","doi":"10.1109/ICHQP.2010.5625368","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625368","url":null,"abstract":"This paper presents how the PWM controlled AC locomotives are disturbing the electric network with harmonics.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121830922","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625311
J. C. Cebrian, C. Almeida, N. Kagan
This paper presents a methodology which determines the optimal allocation of power quality monitors, in order to monitor the occurrence of voltage sags and swells in distribution networks. Initially, the methodology characterizes the system under analysis regarding the occurrence of voltage sag and swells. This characterization is performed through the simulation of several short-circuits at different points of the system being studied and taking in to consideration several conditions (fault impedance, fault type, etc.). For this purpose, a new method that defines the most relevant short-circuit conditions is proposed. After the system's characterization, the methodology makes use of Genetic Algorithms (GA) to define the minimum number of monitors required to monitor the whole system, and also the places where these monitors should be installed in the power network.
{"title":"Genetic algorithms applied for the optimal allocation of power quality monitors in distribution networks","authors":"J. C. Cebrian, C. Almeida, N. Kagan","doi":"10.1109/ICHQP.2010.5625311","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625311","url":null,"abstract":"This paper presents a methodology which determines the optimal allocation of power quality monitors, in order to monitor the occurrence of voltage sags and swells in distribution networks. Initially, the methodology characterizes the system under analysis regarding the occurrence of voltage sag and swells. This characterization is performed through the simulation of several short-circuits at different points of the system being studied and taking in to consideration several conditions (fault impedance, fault type, etc.). For this purpose, a new method that defines the most relevant short-circuit conditions is proposed. After the system's characterization, the methodology makes use of Genetic Algorithms (GA) to define the minimum number of monitors required to monitor the whole system, and also the places where these monitors should be installed in the power network.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121083851","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625492
A. Osnach
In order to determine apparent power and its components the currents and voltages are presented in the shape of orthogonal functions. On this ground values of active and reactive powers are determined as components of a scalar product of the voltage and current vectors. An example of calculation of powers in thyristor controlled RL -load is presented. Here the vector of input voltage is formed taking into consideration the potentialities of the source of electric energy appearing in nocurrent time intervals. The expression for total power under nonsinusoidal conditions is presented as a generalized form of known expression for an apparent power of fundamental harmonic. Also the calculation of an exchange power Qex for the circuit under consideration is given.
{"title":"Power components in a circuit under nonsinusoidal conditions","authors":"A. Osnach","doi":"10.1109/ICHQP.2010.5625492","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625492","url":null,"abstract":"In order to determine apparent power and its components the currents and voltages are presented in the shape of orthogonal functions. On this ground values of active and reactive powers are determined as components of a scalar product of the voltage and current vectors. An example of calculation of powers in thyristor controlled RL -load is presented. Here the vector of input voltage is formed taking into consideration the potentialities of the source of electric energy appearing in nocurrent time intervals. The expression for total power under nonsinusoidal conditions is presented as a generalized form of known expression for an apparent power of fundamental harmonic. Also the calculation of an exchange power Qex for the circuit under consideration is given.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127139939","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625309
M. Caujolle, M. Petit, G. Fleury, L. Berthet
This paper proposes a method for detecting Power Quality (PQ) disturbances measured on distribution networks. The detection efficiencies of two types of detection vectors are compared: the estimation error returned by a Kalman Filter (KF) based on a harmonic model and the detail coefficients given by a Multi-Resolution Analysis (MRA). The detection capabilities of different state-models and wavelet families are tested on waveform recordings of PQ disturbances including faults, transformer energizing, capacitor bank switching or ripple control.
{"title":"Reliable power disturbance detection using wavelet decomposition or harmonic model based Kalman filtering","authors":"M. Caujolle, M. Petit, G. Fleury, L. Berthet","doi":"10.1109/ICHQP.2010.5625309","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625309","url":null,"abstract":"This paper proposes a method for detecting Power Quality (PQ) disturbances measured on distribution networks. The detection efficiencies of two types of detection vectors are compared: the estimation error returned by a Kalman Filter (KF) based on a harmonic model and the detail coefficients given by a Multi-Resolution Analysis (MRA). The detection capabilities of different state-models and wavelet families are tested on waveform recordings of PQ disturbances including faults, transformer energizing, capacitor bank switching or ripple control.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127232482","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625428
S. Kilyeni, O. Pop, G. Proștean, C. Craciun
The authors are proposing a transmission cost allocation method, using the real and reactive power flow tracing. It is based on Z bus system matrix. The real and reactive power losses are considered. The case study refers to the 12 buses test power system, heaving 6 P-U buses and 6 P-Q buses. The comparison is performed for neglecting and considering the transversal conductance.
{"title":"Transmission cost allocation based on power flow tracing using Z bus matrix","authors":"S. Kilyeni, O. Pop, G. Proștean, C. Craciun","doi":"10.1109/ICHQP.2010.5625428","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625428","url":null,"abstract":"The authors are proposing a transmission cost allocation method, using the real and reactive power flow tracing. It is based on Z bus system matrix. The real and reactive power losses are considered. The case study refers to the 12 buses test power system, heaving 6 P-U buses and 6 P-Q buses. The comparison is performed for neglecting and considering the transversal conductance.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129032908","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625463
C. Bovo, Marcello Baioni, A. Berizzi
The electricity production field is undergoing a significant change because of both the liberalization of the sector and the policies to support renewable energy sources (RES) and those assimilated to them; in particular, among the latter, the cogeneration technology for civil applications, able to improve the overall energy efficiency, is taken into account in this paper. The electrical generation associated to cogeneration is typically connected to low voltage networks, making them active networks. The aim of this work is to assess the impact of 30 kW cogeneration modules on a typical distribution network of an area with highly populated. In particular, the analysis is focused on power flows, real power losses and rapid voltage variations.
{"title":"Power quality impact of cogeneration modules in urban networks","authors":"C. Bovo, Marcello Baioni, A. Berizzi","doi":"10.1109/ICHQP.2010.5625463","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625463","url":null,"abstract":"The electricity production field is undergoing a significant change because of both the liberalization of the sector and the policies to support renewable energy sources (RES) and those assimilated to them; in particular, among the latter, the cogeneration technology for civil applications, able to improve the overall energy efficiency, is taken into account in this paper. The electrical generation associated to cogeneration is typically connected to low voltage networks, making them active networks. The aim of this work is to assess the impact of 30 kW cogeneration modules on a typical distribution network of an area with highly populated. In particular, the analysis is focused on power flows, real power losses and rapid voltage variations.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132234268","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625406
V. Ćuk, J. Cobben, W. Kling, R. Timens
An experimental investigation of diversity factors for CFLs (compact fluorescent lamps) in combination with LED (light emitting diode) lamps is presented in this paper. Diversity factors were calculated for different configurations of lamps connected to the same feeder in one phase. It was found that the presence of LED lamps with a high apparent power input can lead to considerable damping of harmonics. If the number of CFLs is much greater, this effect was found as very low. Harmonic emission limits for lamps were also analyzed. A conclusion has been made that with a sufficient variety of energy saving lamps phasing out of incandescent lamps should not significantly impact the resultant harmonic distortion.
{"title":"An analysis of diversity factors applied to harmonic emission limits for energy saving lamps","authors":"V. Ćuk, J. Cobben, W. Kling, R. Timens","doi":"10.1109/ICHQP.2010.5625406","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625406","url":null,"abstract":"An experimental investigation of diversity factors for CFLs (compact fluorescent lamps) in combination with LED (light emitting diode) lamps is presented in this paper. Diversity factors were calculated for different configurations of lamps connected to the same feeder in one phase. It was found that the presence of LED lamps with a high apparent power input can lead to considerable damping of harmonics. If the number of CFLs is much greater, this effect was found as very low. Harmonic emission limits for lamps were also analyzed. A conclusion has been made that with a sufficient variety of energy saving lamps phasing out of incandescent lamps should not significantly impact the resultant harmonic distortion.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134273295","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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