Pub Date : 2014-05-25DOI: 10.1109/ICHQP.2014.6842880
N. Okada, Kenji Yukihira
Reproductive simulation of the measurement data by the harmonic analyze is start point to understand harmonic voltage distortion mechanism, but the method to estimate the harmonics distribution among the many utility customers has not been established. In the last decade, harmonic analysis of Japanese middle voltage customer and low voltage customer has been done, the distribution of the fifth harmonic current can be classified middle voltage customer's single phase load, low voltage customer's three phase and single phase load named group A and middle voltage three phase load named group B, and the amplitude per load kW has been investigated from sum of each current vector. By the application of this knowledge, there is a possibility to estimate the harmonic distribution with many harmonic source in the distribution network. In this paper, we developed a harmonic state estimation method with limited measurement condition by using the fifth harmonic current phase angle classification model. Numerical experiments are conducted in seven node distribution network to test the proposed method. The results show that the proposed harmonic state estimation by using the fifth harmonic current phase angle classification model approach can reliably identify harmonic distribution in the change of load conditions, background harmonic voltage phase angle and series inductance of shunt capacitors.
{"title":"Harmonic state estimation in distribution network based on fifth harmonic current characteristic","authors":"N. Okada, Kenji Yukihira","doi":"10.1109/ICHQP.2014.6842880","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842880","url":null,"abstract":"Reproductive simulation of the measurement data by the harmonic analyze is start point to understand harmonic voltage distortion mechanism, but the method to estimate the harmonics distribution among the many utility customers has not been established. In the last decade, harmonic analysis of Japanese middle voltage customer and low voltage customer has been done, the distribution of the fifth harmonic current can be classified middle voltage customer's single phase load, low voltage customer's three phase and single phase load named group A and middle voltage three phase load named group B, and the amplitude per load kW has been investigated from sum of each current vector. By the application of this knowledge, there is a possibility to estimate the harmonic distribution with many harmonic source in the distribution network. In this paper, we developed a harmonic state estimation method with limited measurement condition by using the fifth harmonic current phase angle classification model. Numerical experiments are conducted in seven node distribution network to test the proposed method. The results show that the proposed harmonic state estimation by using the fifth harmonic current phase angle classification model approach can reliably identify harmonic distribution in the change of load conditions, background harmonic voltage phase angle and series inductance of shunt capacitors.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115662819","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842750
Mariana Geny Moreira, D. Ferreira, C. Duque
A large effort had been made for improving the quality of electric power in the last years. More often, the studies concern over methods and techniques to enhance monitoring systems with efficient fault detection and identification. This paper proposes a method based on higher order statistics for sub-harmonic's detection and identification. Simulation results shown the accuracy and capability of the proposed technique, which furnishes a reasonable performance.
{"title":"Sub-harmonics detection and identification using higher order statistics","authors":"Mariana Geny Moreira, D. Ferreira, C. Duque","doi":"10.1109/ICHQP.2014.6842750","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842750","url":null,"abstract":"A large effort had been made for improving the quality of electric power in the last years. More often, the studies concern over methods and techniques to enhance monitoring systems with efficient fault detection and identification. This paper proposes a method based on higher order statistics for sub-harmonic's detection and identification. Simulation results shown the accuracy and capability of the proposed technique, which furnishes a reasonable performance.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125486765","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842924
J. Kilter, Jan Meyer, S. Elphick, J. Milanović
This paper summarizes major results of the CIGRE/CIRED JWG C4.112 - “Guidelines for Power quality monitoring - measurement locations, processing and presentation of data”. The results presented in this paper cover the work of JWG from January 2011 to January 2014. The paper provides information about the current PQ monitoring practices and makes recommendations for future monitoring campaigns considering monitoring locations, selection of monitoring parameters, and presentation of monitoring results.
{"title":"Guidelines for Power quality monitoring - Results from CIGRE/CIRED JWG C4.112","authors":"J. Kilter, Jan Meyer, S. Elphick, J. Milanović","doi":"10.1109/ICHQP.2014.6842924","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842924","url":null,"abstract":"This paper summarizes major results of the CIGRE/CIRED JWG C4.112 - “Guidelines for Power quality monitoring - measurement locations, processing and presentation of data”. The results presented in this paper cover the work of JWG from January 2011 to January 2014. The paper provides information about the current PQ monitoring practices and makes recommendations for future monitoring campaigns considering monitoring locations, selection of monitoring parameters, and presentation of monitoring results.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126189078","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842774
D. Schwanz, Roberto Chouhy Leborgne
In this paper it will be presented a case study on the calculation of harmonic distortion generated by a wind farm through its simulation in the time and frequency domain. The simulated wind farm uses multipolar synchronous generators, and their connection to the power grid is made by frequency converters. The obtained results in the time domain will be compared with data obtained through simulation in the frequency domain. Thus, by the obtained results will be possible to compare the methods and determine the harmonic distortion of the analyzed wind farm.
{"title":"Comparative harmonic study of a wind farm: Time vs frequency domain simulation","authors":"D. Schwanz, Roberto Chouhy Leborgne","doi":"10.1109/ICHQP.2014.6842774","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842774","url":null,"abstract":"In this paper it will be presented a case study on the calculation of harmonic distortion generated by a wind farm through its simulation in the time and frequency domain. The simulated wind farm uses multipolar synchronous generators, and their connection to the power grid is made by frequency converters. The obtained results in the time domain will be compared with data obtained through simulation in the frequency domain. Thus, by the obtained results will be possible to compare the methods and determine the harmonic distortion of the analyzed wind farm.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125890713","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842926
K. Górecki
This paper presents possible use of floating-point signal processor for the purpose of measuring harmonics and interharmonics and for detection of transient events in real-time. WPT and its characteristics to decompose signal into components were applied as calculation method. Also various wavelet-based and IIR filters were analysed. The main reason for that was to check the time used for the decomposition process in accordance with the WPT tree for 5 decomposition levels of the measurement window according to the quality standards of electricity.
{"title":"WPT in power quality measurement system based on digital signal processor","authors":"K. Górecki","doi":"10.1109/ICHQP.2014.6842926","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842926","url":null,"abstract":"This paper presents possible use of floating-point signal processor for the purpose of measuring harmonics and interharmonics and for detection of transient events in real-time. WPT and its characteristics to decompose signal into components were applied as calculation method. Also various wavelet-based and IIR filters were analysed. The main reason for that was to check the time used for the decomposition process in accordance with the WPT tree for 5 decomposition levels of the measurement window according to the quality standards of electricity.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124882527","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842874
E. Cazacu, L. Petrescu
The paper presents the quantitative evaluation of the magnetizing inrush current initiated at the connection instant of various three phase iron core reactors to a low-voltage power network. An analytical approach is adopted, which bases on the ferromagnetic coils circuit model and its time domain transient characterization. Thus, the solutions of the corresponding nonlinear differential equation system allow extracting the main inrush current features: waveform signature, amplitude and duration. The major power quality issues generated by the three phase reactors energizing process are also investigated and additionally some inrush current mitigation techniques are suggested.
{"title":"Magnetising inrush current of low-voltage iron core three phase power reactors","authors":"E. Cazacu, L. Petrescu","doi":"10.1109/ICHQP.2014.6842874","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842874","url":null,"abstract":"The paper presents the quantitative evaluation of the magnetizing inrush current initiated at the connection instant of various three phase iron core reactors to a low-voltage power network. An analytical approach is adopted, which bases on the ferromagnetic coils circuit model and its time domain transient characterization. Thus, the solutions of the corresponding nonlinear differential equation system allow extracting the main inrush current features: waveform signature, amplitude and duration. The major power quality issues generated by the three phase reactors energizing process are also investigated and additionally some inrush current mitigation techniques are suggested.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124372783","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842754
D. Sabin, W. J. Olechiw, Elder Romero, R. Manning, M. Waclawiak
In 2008, United Illuminating Company (UI) began a pilot project to use power quality monitors to locate faults on distribution feeders supplied by 13.8 kV systems. Fault measurements captured by the meters are downloaded automatically, integrated into a relational database, and processed for reactance calculations. The reactance calculations are combined with detailed distribution circuit models and geographic information system data to build estimated fault location tables and web-based map displays. The systems are integrated on the company intranet and used in real-time by numerous groups within UI including power quality engineers, control room operators, field operations, and distribution planning. The algorithm used for waveform processing can distinguish between single-phase faults, multi-phase faults, subcycle faults, and feeder energizing magnetizing inrush. This paper will present an overview of some of the parameters and practices for finding faults at UI.
{"title":"Overview of an automatic distribution fault location system using power quality monitors","authors":"D. Sabin, W. J. Olechiw, Elder Romero, R. Manning, M. Waclawiak","doi":"10.1109/ICHQP.2014.6842754","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842754","url":null,"abstract":"In 2008, United Illuminating Company (UI) began a pilot project to use power quality monitors to locate faults on distribution feeders supplied by 13.8 kV systems. Fault measurements captured by the meters are downloaded automatically, integrated into a relational database, and processed for reactance calculations. The reactance calculations are combined with detailed distribution circuit models and geographic information system data to build estimated fault location tables and web-based map displays. The systems are integrated on the company intranet and used in real-time by numerous groups within UI including power quality engineers, control room operators, field operations, and distribution planning. The algorithm used for waveform processing can distinguish between single-phase faults, multi-phase faults, subcycle faults, and feeder energizing magnetizing inrush. This paper will present an overview of some of the parameters and practices for finding faults at UI.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131311596","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842933
P. Atănăsoae, R. Pentiuc
The power quality monitoring is one of the modern issues of the electricity market. The permanent monitoring of power quality parameters is used to verify the contractual requirements presented in regulations. There is a need for common power quality indices that are the result of synthesis, reducing or extracting from a large volume of power quality measurement data. The values for these indices have to be compared to the limits described by the national regulator. The paper presents in a synthetic manner, indices for the continuity and power quality monitoring in the Romanian Power Transmission System. Are identified the main causes of worsening power quality in some areas of the transmission system.
{"title":"Indices for the power quality monitoring in the Romanian Power Transmission System","authors":"P. Atănăsoae, R. Pentiuc","doi":"10.1109/ICHQP.2014.6842933","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842933","url":null,"abstract":"The power quality monitoring is one of the modern issues of the electricity market. The permanent monitoring of power quality parameters is used to verify the contractual requirements presented in regulations. There is a need for common power quality indices that are the result of synthesis, reducing or extracting from a large volume of power quality measurement data. The values for these indices have to be compared to the limits described by the national regulator. The paper presents in a synthetic manner, indices for the continuity and power quality monitoring in the Romanian Power Transmission System. Are identified the main causes of worsening power quality in some areas of the transmission system.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126398091","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842928
A. Kriukov, G. Grigoraș, Florina Scarlatache, O. Ivanov, Bogdan Vicol
The basic function of a power system is to provide an adequate electrical supply to its customers as economically as possible with reasonable level of reliability. Evaluating the reliability of a power system is a complex process and the work with the actual methods is difficult. Reliability studies require information about the history of the network components' behaviour, about the economic consequences of outages etc. The input data for analysis methods are the reliability coefficients in the perspective of the long time behaviour of the system. This general framework is now known as one that can use the uncertainties in reliability indices (failure and repair rates) and can find the System Average Interruption Duration Index (SAIDI) as fuzzy variable. In this paper we propose to use fuzzy techniques instead of the statistical methods in determination of the reliability indices. The length of the distribution feeders is also another variable included in the fuzzy model. Test results on real distribution networks show that the proposed method can be used as a powerful tool for estimation of SAIDI.
{"title":"Use of fuzzy techniques in reliability assessment of electric distribution systems","authors":"A. Kriukov, G. Grigoraș, Florina Scarlatache, O. Ivanov, Bogdan Vicol","doi":"10.1109/ICHQP.2014.6842928","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842928","url":null,"abstract":"The basic function of a power system is to provide an adequate electrical supply to its customers as economically as possible with reasonable level of reliability. Evaluating the reliability of a power system is a complex process and the work with the actual methods is difficult. Reliability studies require information about the history of the network components' behaviour, about the economic consequences of outages etc. The input data for analysis methods are the reliability coefficients in the perspective of the long time behaviour of the system. This general framework is now known as one that can use the uncertainties in reliability indices (failure and repair rates) and can find the System Average Interruption Duration Index (SAIDI) as fuzzy variable. In this paper we propose to use fuzzy techniques instead of the statistical methods in determination of the reliability indices. The length of the distribution feeders is also another variable included in the fuzzy model. Test results on real distribution networks show that the proposed method can be used as a powerful tool for estimation of SAIDI.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125504657","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842792
D. Rusinaru, L. Manescu, M. Merfu, P. Postolache
This paper has focused on power quality investigation based on complex measurements in the substations of local distribution networks. The distribution network area chosen for the present analysis is of interest for a further renewable sources connection. For the power quality assessment a new type of information report is discussed as viable future alternative for network operator. According to this, the phenomena are evaluated and displayed in a unitary manner by using the ranking of power quality level based on normalized parameters. PQ disturbances maps can be drawn by using this condensed information format.
{"title":"Power quality general levels in distribution networks","authors":"D. Rusinaru, L. Manescu, M. Merfu, P. Postolache","doi":"10.1109/ICHQP.2014.6842792","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842792","url":null,"abstract":"This paper has focused on power quality investigation based on complex measurements in the substations of local distribution networks. The distribution network area chosen for the present analysis is of interest for a further renewable sources connection. For the power quality assessment a new type of information report is discussed as viable future alternative for network operator. According to this, the phenomena are evaluated and displayed in a unitary manner by using the ranking of power quality level based on normalized parameters. PQ disturbances maps can be drawn by using this condensed information format.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"276 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131719681","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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