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.2010.5625411
S. Ronnberg, M. Bollen, M. Wahlberg
This paper presents an investigation after the impact on a number of power-quality parameters due to the change from incandescent lamps to energy saving lamps like CFL and LED. The measurements were conducted in a full-scale laboratory model with ordinary household equipment connected, thus simulating an ordinary domestic customer. Incandescent lamps have been replaced in stages by CFL and LED lamps. The CFL's and LED lamps will contribute to an increase in current distortion but the amplitude of the harmonics is quite low so the change of lighting will only have a minor effect on the total current harmonic distortion. It is also shown that the (total) power factor is not a good indicator to compare the impact of different loads on the system.
{"title":"Harmonic emission before and after changing to LED and CFL — Part I: Laboratory measurements for a domestic customer","authors":"S. Ronnberg, M. Bollen, M. Wahlberg","doi":"10.1109/ICHQP.2010.5625411","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625411","url":null,"abstract":"This paper presents an investigation after the impact on a number of power-quality parameters due to the change from incandescent lamps to energy saving lamps like CFL and LED. The measurements were conducted in a full-scale laboratory model with ordinary household equipment connected, thus simulating an ordinary domestic customer. Incandescent lamps have been replaced in stages by CFL and LED lamps. The CFL's and LED lamps will contribute to an increase in current distortion but the amplitude of the harmonics is quite low so the change of lighting will only have a minor effect on the total current harmonic distortion. It is also shown that the (total) power factor is not a good indicator to compare the impact of different loads on the system.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"48 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":"133940424","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.2010.5625469
A. Ghadimi, F. Razavi, R. Ghaffarpour
A load sharing control strategy for operating of a distribution system consisting of multiple inverter interfaced Distributed Generation (DG) unit when isolated from a main utility in order to improve continuity and quality of electricity to important loads is presented and tested in this paper. In the stand-alone network, a Master DG unit exists as voltage and frequency reference and the other units work on synchronize with this unit and produce energy to loads. A supervisory controller defines all Distributed Generation units' reference powers with consideration of system and unit normal rating in order to maintain reliable and high quality power to the loads. Simulation results on IEEE 37 node test system verify that the proposed control scheme is effective for stable working of the stand-alone network.
{"title":"Control of islanded inverter interfaced Distributed Generation units for power quality improvement","authors":"A. Ghadimi, F. Razavi, R. Ghaffarpour","doi":"10.1109/ICHQP.2010.5625469","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625469","url":null,"abstract":"A load sharing control strategy for operating of a distribution system consisting of multiple inverter interfaced Distributed Generation (DG) unit when isolated from a main utility in order to improve continuity and quality of electricity to important loads is presented and tested in this paper. In the stand-alone network, a Master DG unit exists as voltage and frequency reference and the other units work on synchronize with this unit and produce energy to loads. A supervisory controller defines all Distributed Generation units' reference powers with consideration of system and unit normal rating in order to maintain reliable and high quality power to the loads. Simulation results on IEEE 37 node test system verify that the proposed control scheme is effective for stable working of the stand-alone network.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"17 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":"117146138","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.2010.5625419
H. Bronzeado, J. C. de Oliveira, M. D. Teixeira
This paper describes a different approach which has been used to easily visualize the harmonic current components generated by multi-converter systems such as those arrangements used in large electrochemical industries. These configurations are normally established by using a large number of 6-pulse converters fed by transformers with suitable phase shifts. The developed method is based on a steady-state frequency-domain analysis of the non-sinusoidal currents drawn by each 6-pulse converter by considering each harmonic current component as a vector appropriately displaced due to the transformer phase-shift. This new approach is quite useful in visualizing the cancelation of the characteristic harmonic current components are cancelled and, also, how the residual (non-characteristic) harmonics current components will emmerge in multi-converter systems
{"title":"A different approach for visualizing harmonic current components in multi-converter systems","authors":"H. Bronzeado, J. C. de Oliveira, M. D. Teixeira","doi":"10.1109/ICHQP.2010.5625419","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625419","url":null,"abstract":"This paper describes a different approach which has been used to easily visualize the harmonic current components generated by multi-converter systems such as those arrangements used in large electrochemical industries. These configurations are normally established by using a large number of 6-pulse converters fed by transformers with suitable phase shifts. The developed method is based on a steady-state frequency-domain analysis of the non-sinusoidal currents drawn by each 6-pulse converter by considering each harmonic current component as a vector appropriately displaced due to the transformer phase-shift. This new approach is quite useful in visualizing the cancelation of the characteristic harmonic current components are cancelled and, also, how the residual (non-characteristic) harmonics current components will emmerge in multi-converter systems","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"13 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":"117075134","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.2010.5625316
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.2010.5625428
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.2010.5625309
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.2010.5625492
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.2010.5625368
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}
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