Pub Date : 2010-11-09DOI: 10.1109/ICHQP.2010.5625403
M. Asadi, A. Jalilian, H. F. Farahani
Inasmuch as there are many single phase unbalanced linear and non linear loads in distribution system, current flows through null wire. Because of voltage drops of null wire, load voltage will be unbalance. Different methods have been presented for compensation of load current compensation, which shunt active filter is one of them. Shunt active filter is effective on source current, and it can compensate reactive and non sinusoidal currents. If voltage is unbalanced because of unbalanced current, shunt active filter can compensate harmonics, zero and negative sequences of current and the result of compensation is balanced voltage. Is network cause of voltage unbalancing, shunt active filter won't efficient. This paper has presented a Compensation of Unbalanced Non Linear Load Currents and Null Current by Use of Stationary Reference Frame in Shunt Active Filter in order to compensation of harmonics, zero and negative sequences of current. Not only presented control method can compensate harmonic and unbalanced currents, but also it can compensate reactive current, and power factor will be near to unity. To confirm it, shunt active filter has been simulated by PSIM, and the resultants demonstrate efficiency of presented method on compensation of non linear load current, null current and power factor improvement.
{"title":"Compensation of Unbalanced Non Linear Load and neutral currents using stationary Reference Frame in Shunt Active Filters","authors":"M. Asadi, A. Jalilian, H. F. Farahani","doi":"10.1109/ICHQP.2010.5625403","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625403","url":null,"abstract":"Inasmuch as there are many single phase unbalanced linear and non linear loads in distribution system, current flows through null wire. Because of voltage drops of null wire, load voltage will be unbalance. Different methods have been presented for compensation of load current compensation, which shunt active filter is one of them. Shunt active filter is effective on source current, and it can compensate reactive and non sinusoidal currents. If voltage is unbalanced because of unbalanced current, shunt active filter can compensate harmonics, zero and negative sequences of current and the result of compensation is balanced voltage. Is network cause of voltage unbalancing, shunt active filter won't efficient. This paper has presented a Compensation of Unbalanced Non Linear Load Currents and Null Current by Use of Stationary Reference Frame in Shunt Active Filter in order to compensation of harmonics, zero and negative sequences of current. Not only presented control method can compensate harmonic and unbalanced currents, but also it can compensate reactive current, and power factor will be near to unity. To confirm it, shunt active filter has been simulated by PSIM, and the resultants demonstrate efficiency of presented method on compensation of non linear load current, null current and power factor improvement.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"163 4 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":"129255829","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.2010.5625420
A. Blanco, E. Parra
This paper shows the results of a computer simulation of two distribution feeders that supplies energy to costumers who use Compact Fluorescent Lamps and High-Power Light Emitting Diodes. An IEEE 13 node test feeder and a real distribution circuit have been used for the simulations. Voltage and current distortion is analyzed.
{"title":"Effects of high penetration of CFLS and LEDS on the distribution networks","authors":"A. Blanco, E. Parra","doi":"10.1109/ICHQP.2010.5625420","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625420","url":null,"abstract":"This paper shows the results of a computer simulation of two distribution feeders that supplies energy to costumers who use Compact Fluorescent Lamps and High-Power Light Emitting Diodes. An IEEE 13 node test feeder and a real distribution circuit have been used for the simulations. Voltage and current distortion is analyzed.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"29 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":"126494962","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.2010.5625378
F. Della Torre, A. Morando, G. Sapienza
The concept of magneto-electric root mean square (RMS) is extended to the motional cases, where electromechanical energy conversion processes are concurrently present. Emerge, with undiminished physical meaning, the concepts of mechanical RMS of force ƒ(t) and velocity u(t).
{"title":"Power quality analysis of electromechanical energy conversion: A Budeanu approach","authors":"F. Della Torre, A. Morando, G. Sapienza","doi":"10.1109/ICHQP.2010.5625378","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625378","url":null,"abstract":"The concept of magneto-electric root mean square (RMS) is extended to the motional cases, where electromechanical energy conversion processes are concurrently present. Emerge, with undiminished physical meaning, the concepts of mechanical RMS of force ƒ(t) and velocity u(t).","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"66 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":"116257162","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.2010.5625329
A. Fidigatti, E. Ragaini
Current harmonics can produce undesired effect on protection devices, the most common being nuisance tripping on instantaneous overcurrent protections. This paper focuses on the effects of harmonics on overcurrent protection devices, describing the structure and behaviour of circuit breakers fitted with thermal-magnetic trip units and with electronic trip units. Situations in which undesired effects are more likely to occur, as well as some mitigation strategies, are then discussed.
{"title":"Effect of harmonic pollution on low voltage overcurrent protection","authors":"A. Fidigatti, E. Ragaini","doi":"10.1109/ICHQP.2010.5625329","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625329","url":null,"abstract":"Current harmonics can produce undesired effect on protection devices, the most common being nuisance tripping on instantaneous overcurrent protections. This paper focuses on the effects of harmonics on overcurrent protection devices, describing the structure and behaviour of circuit breakers fitted with thermal-magnetic trip units and with electronic trip units. Situations in which undesired effects are more likely to occur, as well as some mitigation strategies, are then discussed.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"15 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":"125337434","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.2010.5625315
A. L. F. Ferreira Filho, J. Cormane, D. C. Garcia, M. V. D. Costa, M. A. G. Oliveira, F. A. do Nascimento
This paper presents the main aspects observed in analyzing Complex Voltage Unbalance Factor (CVUF) behavior resulting from the variation of voltage magnitudes and angles. The goal is to identify possible incoherencies regarding the use of the CVUF, and also to investigate whether this factor is more sensitive to variations in magnitude or angles under various voltage unbalance conditions. This study also evaluates the efficiency of the use of the CVUF angle and its association with positive component magnitudes. The results indicate that the CVUF should not be used as a single and sufficient parameter for the quantification of voltage unbalances, which highlights the need to develop a new indicator which may establish a more clear and simple association between this disturbance and its effects on electrical equipment.
{"title":"Analysis of the complex voltage unbalance factor behavior resulting from the variation of voltage magnitudes and angles","authors":"A. L. F. Ferreira Filho, J. Cormane, D. C. Garcia, M. V. D. Costa, M. A. G. Oliveira, F. A. do Nascimento","doi":"10.1109/ICHQP.2010.5625315","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625315","url":null,"abstract":"This paper presents the main aspects observed in analyzing Complex Voltage Unbalance Factor (CVUF) behavior resulting from the variation of voltage magnitudes and angles. The goal is to identify possible incoherencies regarding the use of the CVUF, and also to investigate whether this factor is more sensitive to variations in magnitude or angles under various voltage unbalance conditions. This study also evaluates the efficiency of the use of the CVUF angle and its association with positive component magnitudes. The results indicate that the CVUF should not be used as a single and sufficient parameter for the quantification of voltage unbalances, which highlights the need to develop a new indicator which may establish a more clear and simple association between this disturbance and its effects on electrical equipment.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"25 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":"123054478","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.2010.5625330
D. Serfontein, A. Rens
Power quality management requires inexpensive and simple methods for electric power quality monitoring. This paper investigates the validity of single point measurements for the localization of sources of waveform distortion as methods claiming the possibility thereof based on the direction of the harmonic active power are continuously being published.
{"title":"The validation of single point measurements for the localization of multiple harmonic sources","authors":"D. Serfontein, A. Rens","doi":"10.1109/ICHQP.2010.5625330","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625330","url":null,"abstract":"Power quality management requires inexpensive and simple methods for electric power quality monitoring. This paper investigates the validity of single point measurements for the localization of sources of waveform distortion as methods claiming the possibility thereof based on the direction of the harmonic active power are continuously being published.","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":"132688828","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.2010.5625388
C. Venkatesh, D. Siva Sarma, M. Sydulu
This paper presents classification and characterization of typical voltage disturbances- sag, swell, interruption and harmonics employing S-transform analysis combined with modular neural network. S-transform is used to extract various features of disturbance signal as it has excellent time-frequency resolution characteristics and ability to detect disturbance correctly even in the presence of noise. Classification is performed using modular neural network with features extracted from S-transform. Modular neural network is designed by modifying the structure of traditional multilayer network into modules for each disturbance to provide less training period and better classification. Disturbances are characterized by magnitude and phase information using S-transform analysis. Simulation and experimental results show that S-transform combined with Modular neural network can effectively detect, classify and characterize the disturbances.
{"title":"Classification of voltage sag, swell and harmonics using S-transform based modular neural network","authors":"C. Venkatesh, D. Siva Sarma, M. Sydulu","doi":"10.1109/ICHQP.2010.5625388","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625388","url":null,"abstract":"This paper presents classification and characterization of typical voltage disturbances- sag, swell, interruption and harmonics employing S-transform analysis combined with modular neural network. S-transform is used to extract various features of disturbance signal as it has excellent time-frequency resolution characteristics and ability to detect disturbance correctly even in the presence of noise. Classification is performed using modular neural network with features extracted from S-transform. Modular neural network is designed by modifying the structure of traditional multilayer network into modules for each disturbance to provide less training period and better classification. Disturbances are characterized by magnitude and phase information using S-transform analysis. Simulation and experimental results show that S-transform combined with Modular neural network can effectively detect, classify and characterize the disturbances.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"63 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":"130348763","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.2010.5625413
S. Ronnberg, M. Wahlberg, M. Bollen
This paper shows the results of measurements performed with a medium-sized hotel in the North of Sweden. The harmonic emission and other parameters were measured before, during and after a replacement of all incandescent lamps with energy saving lamps, both compact fluorescent lamps (CFL's) and light emitting diodes (LED's). it was not possible to see any major difference in harmonic spectrum before and after the replacement. The reduction in power factor that was observed was completely due to the reduction in active power.
{"title":"Harmonic emission before and after changing to LED and CFL — Part II: Field measurements for a hotel","authors":"S. Ronnberg, M. Wahlberg, M. Bollen","doi":"10.1109/ICHQP.2010.5625413","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625413","url":null,"abstract":"This paper shows the results of measurements performed with a medium-sized hotel in the North of Sweden. The harmonic emission and other parameters were measured before, during and after a replacement of all incandescent lamps with energy saving lamps, both compact fluorescent lamps (CFL's) and light emitting diodes (LED's). it was not possible to see any major difference in harmonic spectrum before and after the replacement. The reduction in power factor that was observed was completely due to the reduction in active power.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"185 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":"115724567","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.2010.5625469
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}
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