Pub Date : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177925
J. Yaghoobi, Firuz Zare, Davood Solatialkaran
The penetration level of large-scale inverters utilized in solar farms is continuously increasing. A large part of PV power generation comes from large-scale and high-power inverters, which are normally connected to the grid through a distribution transformer. The operation of these high-power inverters with switching frequency mainly below 9 kHz due to design constrains need to be studied and their short-term incidents need to be understood. For that purpose, in this paper, output currents of three inverters have been measured using field measurements of a 3MW solar farm. The currents are then analyzed in time and frequency domains. The results show large short-term DC current and significant harmonic emissions (0-9 kHz) during short period of times, while the steady-state harmonic levels do not seem to be significant.
{"title":"Harmonic Emissions in 0-9 kHz Frequency Range and Transient Effects in Grid-Connected Inverters Utilised in Solar Farms","authors":"J. Yaghoobi, Firuz Zare, Davood Solatialkaran","doi":"10.1109/ICHQP46026.2020.9177925","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177925","url":null,"abstract":"The penetration level of large-scale inverters utilized in solar farms is continuously increasing. A large part of PV power generation comes from large-scale and high-power inverters, which are normally connected to the grid through a distribution transformer. The operation of these high-power inverters with switching frequency mainly below 9 kHz due to design constrains need to be studied and their short-term incidents need to be understood. For that purpose, in this paper, output currents of three inverters have been measured using field measurements of a 3MW solar farm. The currents are then analyzed in time and frequency domains. The results show large short-term DC current and significant harmonic emissions (0-9 kHz) during short period of times, while the steady-state harmonic levels do not seem to be significant.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115623693","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 : 2020-07-01DOI: 10.1109/ichqp46026.2020.9177896
{"title":"ICHQP 2020 Copyright Page","authors":"","doi":"10.1109/ichqp46026.2020.9177896","DOIUrl":"https://doi.org/10.1109/ichqp46026.2020.9177896","url":null,"abstract":"","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116327797","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177900
J. Drapela, J. Morávek, Lukáš Radil, P. Mastný
Rapid and frequent changes in energy flow direction, those may occur in active distribution systems due to presence of (un)intentional generation with simultaneous consumption, have significant effect on correctness and consequent interpretation of measured power and registered energy by power analyzers and revenue meters based on standard metric with long measuring window. The loss of information because of averaging effect in measuring window is explained and investigated using a numerical model of standard window based metric considering four invariant parameters. Moreover, identified characteristics are verified by means of performed experiments on a set of typical revenue meters. Finally, proposed solution is presented in the conclusion.
{"title":"Performance of Standard Power/Energy Metric under Fast Changes in Active Energy Flow Direction","authors":"J. Drapela, J. Morávek, Lukáš Radil, P. Mastný","doi":"10.1109/ICHQP46026.2020.9177900","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177900","url":null,"abstract":"Rapid and frequent changes in energy flow direction, those may occur in active distribution systems due to presence of (un)intentional generation with simultaneous consumption, have significant effect on correctness and consequent interpretation of measured power and registered energy by power analyzers and revenue meters based on standard metric with long measuring window. The loss of information because of averaging effect in measuring window is explained and investigated using a numerical model of standard window based metric considering four invariant parameters. Moreover, identified characteristics are verified by means of performed experiments on a set of typical revenue meters. Finally, proposed solution is presented in the conclusion.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130058449","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177889
M. Vrána, J. Drapela, D. Topolanek, V. Vycital, M. Jurík, Radim Blahusek, M. Kurfiřt
The paper deals with proposal and utilization of power control of battery storage and electrical vehicle charging systems for autonomous voltage support within charging mode. Similar capability is already introduced and required for photovoltaic invertors and another distributed sources. Starting from requirements on distributed energy resources voltage support defined by means of active power curtailment and reactive power intentional injection, corresponding P(V, f) and Q(V) static characteristics as for charging mode are proposed and their implementation on a reference battery energy storage system is presented. Finally, in terms of performed field tests referred in the paper, positive impact on grid operation (voltage magnitude) with reasonable limitation of charging power is documented and confirmed.
{"title":"Battery Storage and Charging Systems Power Control Supporting Voltage in Charging Mode","authors":"M. Vrána, J. Drapela, D. Topolanek, V. Vycital, M. Jurík, Radim Blahusek, M. Kurfiřt","doi":"10.1109/ICHQP46026.2020.9177889","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177889","url":null,"abstract":"The paper deals with proposal and utilization of power control of battery storage and electrical vehicle charging systems for autonomous voltage support within charging mode. Similar capability is already introduced and required for photovoltaic invertors and another distributed sources. Starting from requirements on distributed energy resources voltage support defined by means of active power curtailment and reactive power intentional injection, corresponding P(V, f) and Q(V) static characteristics as for charging mode are proposed and their implementation on a reference battery energy storage system is presented. Finally, in terms of performed field tests referred in the paper, positive impact on grid operation (voltage magnitude) with reasonable limitation of charging power is documented and confirmed.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127866861","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177874
S. Babaev, V. Ćuk, S. Cobben
This paper demonstrates the applicability of wavelet transforms in the analysis of harmonic distortion propagation in distribution networks. A laboratory experiment involving actual low-voltage feeder and several non-linear loads is proposed for this study. The method is based on the processing of synchronized current and voltage waveforms captured at multiple points of the power network by distributed measurement system with high accuracy. The harmonic propagation phenomena is studied with different types of wavelet transforms, namely decimated discrete wavelet transforms, wavelet packet transforms and continuous wavelet transforms. Advantages of each of the transforms are explained. Together, they form a coherent analysis algorithm culminating in localization of dominant harmonic source in the distribution grid.
{"title":"Application of Wavelets for Study of Harmonic Propagation in Distribution Networks","authors":"S. Babaev, V. Ćuk, S. Cobben","doi":"10.1109/ICHQP46026.2020.9177874","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177874","url":null,"abstract":"This paper demonstrates the applicability of wavelet transforms in the analysis of harmonic distortion propagation in distribution networks. A laboratory experiment involving actual low-voltage feeder and several non-linear loads is proposed for this study. The method is based on the processing of synchronized current and voltage waveforms captured at multiple points of the power network by distributed measurement system with high accuracy. The harmonic propagation phenomena is studied with different types of wavelet transforms, namely decimated discrete wavelet transforms, wavelet packet transforms and continuous wavelet transforms. Advantages of each of the transforms are explained. Together, they form a coherent analysis algorithm culminating in localization of dominant harmonic source in the distribution grid.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126374492","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177922
P. Rodríguez-Pajarón, H. Mendonça, Araceli Hernández
Low Voltage residential demand is characterized by the aggregation of each individual load connected in a dwelling. This paper analyzes different load models described in bibliography for aggregated residential loads by taking into account their nonlinear behaviour in order to assess harmonic levels in distribution networks. The implementation of these models in the simulation software OpenDSS is also described. A comparison of the different load models is addressed in two different networks: the simple IEEE 4 buses test feeder and the more complete IEEE Europe Low Voltage test feeder. Conclusions are extracted about the performance of each model for their application to more complex harmonic assessments.
{"title":"Nonlinear Load Modelling for Harmonic Analysis of Aggregated Residential Loads with OpenDSS","authors":"P. Rodríguez-Pajarón, H. Mendonça, Araceli Hernández","doi":"10.1109/ICHQP46026.2020.9177922","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177922","url":null,"abstract":"Low Voltage residential demand is characterized by the aggregation of each individual load connected in a dwelling. This paper analyzes different load models described in bibliography for aggregated residential loads by taking into account their nonlinear behaviour in order to assess harmonic levels in distribution networks. The implementation of these models in the simulation software OpenDSS is also described. A comparison of the different load models is addressed in two different networks: the simple IEEE 4 buses test feeder and the more complete IEEE Europe Low Voltage test feeder. Conclusions are extracted about the performance of each model for their application to more complex harmonic assessments.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116094106","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177903
S. Elphick, G. Drury, Benjamin Fixter
Australia has perhaps the highest penetration of small scale solar PV generation in the world. There is conjecture with regard to the impact that the inverters used to facilitate connectivity between solar PV generators and the grid will have on power quality disturbance levels. This paper has analysed power quality data collected from several thousand low voltage sites in order to facilitate an empirical investigation of the impact of small scale solar PV generation on PQ disturbance levels. The specific disturbances investigated are steady state voltage, voltage unbalance and voltage THD. The data analysed begins in 2009 when solar PV penetration was low in Australia and concludes with data from 2017. The study outcomes suggest that solar PV generation is leading to a change in the profile of voltage across the day and is increasing voltages to above light load levels at some sites. There is little evidence to support assertions that solar PV systems are increasing either voltage unbalance or voltage THD levels.
{"title":"The Impact of Small Scale Solar PV on Power Quality: An Empirical Study","authors":"S. Elphick, G. Drury, Benjamin Fixter","doi":"10.1109/ICHQP46026.2020.9177903","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177903","url":null,"abstract":"Australia has perhaps the highest penetration of small scale solar PV generation in the world. There is conjecture with regard to the impact that the inverters used to facilitate connectivity between solar PV generators and the grid will have on power quality disturbance levels. This paper has analysed power quality data collected from several thousand low voltage sites in order to facilitate an empirical investigation of the impact of small scale solar PV generation on PQ disturbance levels. The specific disturbances investigated are steady state voltage, voltage unbalance and voltage THD. The data analysed begins in 2009 when solar PV penetration was low in Australia and concludes with data from 2017. The study outcomes suggest that solar PV generation is leading to a change in the profile of voltage across the day and is increasing voltages to above light load levels at some sites. There is little evidence to support assertions that solar PV systems are increasing either voltage unbalance or voltage THD levels.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"230 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132684547","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177881
Harshal Jamode, Karthik Thirumala, Trapti Jain, A. Umarikar
This paper develops a knowledge-based neural network (KBNN) for the classification of power quality (PQ) disturbances. Initially, the tunable-q wavelet transform (TQWT) is employed for the extraction of the 50 Hz component from a voltage signal with any sort of disturbance. This is achieved by varying the quality factor of wavelet according to the signal information. The KBNN is a combined model of neural network and rule-based approach. This paper explores the potential of the KBNN for classification of the most common power quality disturbances. The efficacy of the KBNN approach is evaluated on a wide range of time-varying signals with noise, fundamental frequency deviation, and variation in signal parameters. The performance analysis elucidates the efficiency and robustness of the proposed approach using KBNN classifier for classification of the normal and eight PQ disturbances.
{"title":"Knowledge-based Neural Network for Classification of Power Quality Disturbances","authors":"Harshal Jamode, Karthik Thirumala, Trapti Jain, A. Umarikar","doi":"10.1109/ICHQP46026.2020.9177881","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177881","url":null,"abstract":"This paper develops a knowledge-based neural network (KBNN) for the classification of power quality (PQ) disturbances. Initially, the tunable-q wavelet transform (TQWT) is employed for the extraction of the 50 Hz component from a voltage signal with any sort of disturbance. This is achieved by varying the quality factor of wavelet according to the signal information. The KBNN is a combined model of neural network and rule-based approach. This paper explores the potential of the KBNN for classification of the most common power quality disturbances. The efficacy of the KBNN approach is evaluated on a wide range of time-varying signals with noise, fundamental frequency deviation, and variation in signal parameters. The performance analysis elucidates the efficiency and robustness of the proposed approach using KBNN classifier for classification of the normal and eight PQ disturbances.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134039323","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177871
P. Kuwałek
The paper proposes the use of a multi-point nonparametric method of statistical analysis of voltage changes to identify sources of voltage fluctuations in the power grid. At the beginning of the paper the need to locate disturbing loads and one-point and multi-point methods of their identification were presented, which are most often presented in the literature. The next part discusses the kernel density estimation, which was used in the method for statistical analysis. Then, the propagation of voltage fluctuations was discussed, on the basis of which the proposed method allows to identify the source of disturbances. The individual stages of the proposed method are discussed and the process of locating disturbing loads for three simulated cases in the SIMULINK/MATLAB program has been used.
{"title":"Trace of Flicker Sources by Using Non-Parametric Statistical Analysis of Voltage Changes","authors":"P. Kuwałek","doi":"10.1109/ICHQP46026.2020.9177871","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177871","url":null,"abstract":"The paper proposes the use of a multi-point nonparametric method of statistical analysis of voltage changes to identify sources of voltage fluctuations in the power grid. At the beginning of the paper the need to locate disturbing loads and one-point and multi-point methods of their identification were presented, which are most often presented in the literature. The next part discusses the kernel density estimation, which was used in the method for statistical analysis. Then, the propagation of voltage fluctuations was discussed, on the basis of which the proposed method allows to identify the source of disturbances. The individual stages of the proposed method are discussed and the process of locating disturbing loads for three simulated cases in the SIMULINK/MATLAB program has been used.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"2 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130272650","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 : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177907
J. Kilter, T. Trummal, Mari Löper, I. Palu
This paper summarizes the results of the power quality working group of European Horizon 2020 project MIGRATE. The results presented in this paper cover the part related to power quality legislation principles and procedures in current European transmission systems. Multiple questionnaires were distributed to European transmission system operators and concise overview and discussion about the results, including which standards and procedures are in use, how the system planning levels and customer compatibility levels are defined, is presented.
{"title":"Current Practice on Power Quality Legislation within European Transmission Systems – Results from Horizon 2020 Project MIGRATE","authors":"J. Kilter, T. Trummal, Mari Löper, I. Palu","doi":"10.1109/ICHQP46026.2020.9177907","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177907","url":null,"abstract":"This paper summarizes the results of the power quality working group of European Horizon 2020 project MIGRATE. The results presented in this paper cover the part related to power quality legislation principles and procedures in current European transmission systems. Multiple questionnaires were distributed to European transmission system operators and concise overview and discussion about the results, including which standards and procedures are in use, how the system planning levels and customer compatibility levels are defined, is presented.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115485684","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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