Pub Date : 2020-07-01DOI: 10.1109/ICHQP46026.2020.9177875
T. Vu, D. Robinson, V. Gosbell, S. Perera, R. Memisevic
Power electronic based frequency converters such as solar, wind and batteries, which produce harmonics, are becoming integral parts of modern power systems. Transmission and Distribution Network Operators find it increasingly difficult to manage harmonics in their network. In particular, harmonic allocation to large loads in transmission systems present many challenges for Transmission Network Operators. One of the challenges is that existing methodologies are unclear and often lead to misinterpretation and inconsistent application of harmonic guidelines and standards and ultimately fail to achieve fair and equitable harmonic allocation. Another challenge is that harmonic amplification, damping and absorption capability of transmission systems can be heavily affected by the complex relationship among synchronous machines, transmission lines and reactive network elements such as transformers, reactors and capacitors, under different network scenarios. This paper evaluates the practical application of different harmonic allocation methodologies and recommends the most practical method that allows maximum allocations to loads in transmission systems while ensuring compliance with planning levels.
{"title":"Evaluation of Practical Application of Different Harmonic Allocation Methodologies","authors":"T. Vu, D. Robinson, V. Gosbell, S. Perera, R. Memisevic","doi":"10.1109/ICHQP46026.2020.9177875","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177875","url":null,"abstract":"Power electronic based frequency converters such as solar, wind and batteries, which produce harmonics, are becoming integral parts of modern power systems. Transmission and Distribution Network Operators find it increasingly difficult to manage harmonics in their network. In particular, harmonic allocation to large loads in transmission systems present many challenges for Transmission Network Operators. One of the challenges is that existing methodologies are unclear and often lead to misinterpretation and inconsistent application of harmonic guidelines and standards and ultimately fail to achieve fair and equitable harmonic allocation. Another challenge is that harmonic amplification, damping and absorption capability of transmission systems can be heavily affected by the complex relationship among synchronous machines, transmission lines and reactive network elements such as transformers, reactors and capacitors, under different network scenarios. This paper evaluates the practical application of different harmonic allocation methodologies and recommends the most practical method that allows maximum allocations to loads in transmission systems while ensuring compliance with planning levels.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"40 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":"115901047","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/ICHQP46026.2020.9177935
J. Kennedy, Martina Morcos, Assane Lo
The proliferation of distributed generation has increased the complexity of voltage regulation in distribution networks. Asymmetrical line impedance, the presence of single phase generation and unbalanced loading can produce voltage unbalance. The performance of high efficiency three-phase induction machines drops significantly with voltage unbalance. Currently, there is no mechanism to ensure that a customer in ownership of a voltage unbalance sensitive load is compensated for excessive voltage unbalance. In response, the authors propose a market framework where compensation is to be paid between offending and affected customers where voltage unbalance limits are exceeded. The ideal compensation payments are calculated using Shapley values, but this technique is found to be prohibitively computationally expensive for large numbers of loads. An approximate method using voltage unbalance sensitivities is proposed as a remedy. The approximate method is compared with the Shapley value method using a nine load bus case study with a voltage unbalance violation compensation cost of $10. The results show a $2.11 root mean squared error for individual voltage unbalance compensation calculations over 1000 randomly generated cases with an unacceptable voltage unbalance. The diversif cation of compensation payments over many violations substantially reduced the error.
{"title":"Cost Allocation of Voltage Unbalance in Distribution Networks","authors":"J. Kennedy, Martina Morcos, Assane Lo","doi":"10.1109/ICHQP46026.2020.9177935","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177935","url":null,"abstract":"The proliferation of distributed generation has increased the complexity of voltage regulation in distribution networks. Asymmetrical line impedance, the presence of single phase generation and unbalanced loading can produce voltage unbalance. The performance of high efficiency three-phase induction machines drops significantly with voltage unbalance. Currently, there is no mechanism to ensure that a customer in ownership of a voltage unbalance sensitive load is compensated for excessive voltage unbalance. In response, the authors propose a market framework where compensation is to be paid between offending and affected customers where voltage unbalance limits are exceeded. The ideal compensation payments are calculated using Shapley values, but this technique is found to be prohibitively computationally expensive for large numbers of loads. An approximate method using voltage unbalance sensitivities is proposed as a remedy. The approximate method is compared with the Shapley value method using a nine load bus case study with a voltage unbalance violation compensation cost of $10. The results show a $2.11 root mean squared error for individual voltage unbalance compensation calculations over 1000 randomly generated cases with an unacceptable voltage unbalance. The diversif cation of compensation payments over many violations substantially reduced the error.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"37 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":"127466638","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/ICHQP46026.2020.9177869
G. Anu, F. Fernandez
This paper focuses on identifying harmonic injection by non-linear load at customer location. Presently, customer harmonic contribution cannot be accurately measured leading to penalizing customers not causing harmonic pollution. Hence this matter is of utmost importance since more non-linear loads penetrate into system. These harmonic currents causes voltage distortion at PCC affecting the linear loads. As a result distortion powers flows in the system creating additional power loss. A new index is defined for accurately identifying the harmonic injection of individual customer and distortion power is calculated as per IEEE standard 1459-2010. Simulation results validate the proposed method. Further development can lead to a tariff regime where only actual harmonic polluters be penalized.
{"title":"Identification of Harmonic Injection and Distortion Power at Customer Location","authors":"G. Anu, F. Fernandez","doi":"10.1109/ICHQP46026.2020.9177869","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177869","url":null,"abstract":"This paper focuses on identifying harmonic injection by non-linear load at customer location. Presently, customer harmonic contribution cannot be accurately measured leading to penalizing customers not causing harmonic pollution. Hence this matter is of utmost importance since more non-linear loads penetrate into system. These harmonic currents causes voltage distortion at PCC affecting the linear loads. As a result distortion powers flows in the system creating additional power loss. A new index is defined for accurately identifying the harmonic injection of individual customer and distortion power is calculated as per IEEE standard 1459-2010. Simulation results validate the proposed method. Further development can lead to a tariff regime where only actual harmonic polluters be penalized.","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":"124219897","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/ICHQP46026.2020.9177897
R. Igual, S. Miraftabzadeh, F. Foiadelli, C. Medrano
Automatic classification of power quality distortions has been studied extensively. Many studies adopted the Stockwell Transform as an appropriate signal processing technique. In this paper, features extracted from the Stockwell Transform are used in two classification techniques. Some of these features have not been seen before in any study on power quality classification. The contribution of this paper is the analysis of these features to determine their importance in classification results. This analysis is not common in power quality studies. As a result, a feature based on computing the contour of the third harmonic was found to be the most discriminant feature. For the study, datasets at different noise levels were generated using a public model. They were uploaded to a public repository to be reused by any interested researcher.
{"title":"Quantification of feature importance in automatic classification of power quality distortions","authors":"R. Igual, S. Miraftabzadeh, F. Foiadelli, C. Medrano","doi":"10.1109/ICHQP46026.2020.9177897","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177897","url":null,"abstract":"Automatic classification of power quality distortions has been studied extensively. Many studies adopted the Stockwell Transform as an appropriate signal processing technique. In this paper, features extracted from the Stockwell Transform are used in two classification techniques. Some of these features have not been seen before in any study on power quality classification. The contribution of this paper is the analysis of these features to determine their importance in classification results. This analysis is not common in power quality studies. As a result, a feature based on computing the contour of the third harmonic was found to be the most discriminant feature. For the study, datasets at different noise levels were generated using a public model. They were uploaded to a public repository to be reused by any interested researcher.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"103 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":"131302843","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/ICHQP46026.2020.9177898
S. Qaisar, F. Alsharif
In modern countries, the concept of using smart meters grows quickly. The smart grid stakeholders need to be provided with a comprehensive metering data collection and analysis. Time invariant is the conventional data sampling method. As a consequence, a significant amount of excessive data is collected, stored and processed. This deficiency is overcome by the use of level-crossing sampling technique. It allows data compression in real time. Subsequently, modern adaptive rate techniques are used for data segmentation and extraction functions. The related characteristics for the usage habits of appliances are then used to classify them.It is realized by the use of the mature classification technique of Artificial Neural Network. The findings achievesa 4.5-fold increase in compression and the processing capacity of the proposed system while preserving 95.9 percent accuracy of identification.
{"title":"Efficient Detection of Appliance Consumption Pattern by Using Level-CrossingSampling","authors":"S. Qaisar, F. Alsharif","doi":"10.1109/ICHQP46026.2020.9177898","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177898","url":null,"abstract":"In modern countries, the concept of using smart meters grows quickly. The smart grid stakeholders need to be provided with a comprehensive metering data collection and analysis. Time invariant is the conventional data sampling method. As a consequence, a significant amount of excessive data is collected, stored and processed. This deficiency is overcome by the use of level-crossing sampling technique. It allows data compression in real time. Subsequently, modern adaptive rate techniques are used for data segmentation and extraction functions. The related characteristics for the usage habits of appliances are then used to classify them.It is realized by the use of the mature classification technique of Artificial Neural Network. The findings achievesa 4.5-fold increase in compression and the processing capacity of the proposed system while preserving 95.9 percent accuracy of identification.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"45 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":"133246317","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/ICHQP46026.2020.9177876
A. Blanco, F. Möller, Jan Meyer, P. Schegner
The leakage currents produced by typical household devices are investigated. Accurate measurements of 18 single devices and 16 mixes of devices were made using a high accurate laboratory setup. The influences of the voltage distortion, voltage magnitude and frequency dependent network impedances are also addressed. The results showed that the leakage current produced by new devices, like electric vehicles and photovoltaic inverters, is higher than the leakage current produced by traditional household appliances. The network impedance and the voltage distortion have a considerable effect on the resulting leakage currents, especially voltage distortions with supraharmonic components seem to produce an additional increase of the leakage currents.
{"title":"Characterization of the leakage currents produced by household electronic devices","authors":"A. Blanco, F. Möller, Jan Meyer, P. Schegner","doi":"10.1109/ICHQP46026.2020.9177876","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177876","url":null,"abstract":"The leakage currents produced by typical household devices are investigated. Accurate measurements of 18 single devices and 16 mixes of devices were made using a high accurate laboratory setup. The influences of the voltage distortion, voltage magnitude and frequency dependent network impedances are also addressed. The results showed that the leakage current produced by new devices, like electric vehicles and photovoltaic inverters, is higher than the leakage current produced by traditional household appliances. The network impedance and the voltage distortion have a considerable effect on the resulting leakage currents, especially voltage distortions with supraharmonic components seem to produce an additional increase of the leakage currents.","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":"134137295","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}
The reasonable selection of voltage dip treatment equipment is beneficial to improve the user’s economic efficiency and reduce the user’s power consumption risk, thus greatly improving the power quality of the user’s periphery and even the entire power grid. In order to make up for the lack of integrity of the existing voltage dip governance strategy, according to the economic analysis of the voltage dip treatment equipment, an economic benefit model based on the annual value method is proposed, taking into account the user’s economic loss and investment cost, and adopting Particle swarm optimization. Taking DVR and UPS equipment as an example, a sensitive load factory is selected for case analysis to verify the applicability of the proposed model.
{"title":"Economic Evaluation Method for the Voltage Dip Problem","authors":"Ding Heng, Zhang Wei, Lin Yujia, Chen Meng, Miao Wenzhuo, Chen Zhu, Bie Fangmei","doi":"10.1109/ICHQP46026.2020.9177921","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177921","url":null,"abstract":"The reasonable selection of voltage dip treatment equipment is beneficial to improve the user’s economic efficiency and reduce the user’s power consumption risk, thus greatly improving the power quality of the user’s periphery and even the entire power grid. In order to make up for the lack of integrity of the existing voltage dip governance strategy, according to the economic analysis of the voltage dip treatment equipment, an economic benefit model based on the annual value method is proposed, taking into account the user’s economic loss and investment cost, and adopting Particle swarm optimization. Taking DVR and UPS equipment as an example, a sensitive load factory is selected for case analysis to verify the applicability of the proposed model.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"80 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":"127558426","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/ICHQP46026.2020.9177918
E. Kaufhold, Jan Meyer, P. Schegner
This paper presents an experimental study on the transient response of three commercially available photovoltaic (PV) inverters on step changes in the supply voltage distortion. Step changes of individual harmonics are applied to three different PV inverters varying in order, amplitude and phase angle. Moreover, different times of switching in terms of the fundamental frequency, i.e. points on wave, are considered. From the laboratory results presented, it can be seen that the inverters behave very different. To quantify the dynamic response characteristics, three parameters of interest are defined and evaluated: the overshoot of the grid-side current, the settling time and the eigenfrequencies of the transient response. The dependencies of these parameters on the above mentioned impact factors are analyzed, which can be used e.g. to develop dynamic models of PV inverters. The paper demonstrates the importance for assessing the transient response (dynamic behavior) of PV inverters and the individuality of their behavior, which requires inverter-make dependent models for grid-studies. A single model covering different makes of inverters is insufficient.
{"title":"Transient response of single-phase photovoltaic inverters to step changes in supply voltage distortion","authors":"E. Kaufhold, Jan Meyer, P. Schegner","doi":"10.1109/ICHQP46026.2020.9177918","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177918","url":null,"abstract":"This paper presents an experimental study on the transient response of three commercially available photovoltaic (PV) inverters on step changes in the supply voltage distortion. Step changes of individual harmonics are applied to three different PV inverters varying in order, amplitude and phase angle. Moreover, different times of switching in terms of the fundamental frequency, i.e. points on wave, are considered. From the laboratory results presented, it can be seen that the inverters behave very different. To quantify the dynamic response characteristics, three parameters of interest are defined and evaluated: the overshoot of the grid-side current, the settling time and the eigenfrequencies of the transient response. The dependencies of these parameters on the above mentioned impact factors are analyzed, which can be used e.g. to develop dynamic models of PV inverters. The paper demonstrates the importance for assessing the transient response (dynamic behavior) of PV inverters and the individuality of their behavior, which requires inverter-make dependent models for grid-studies. A single model covering different makes of inverters is insufficient.","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"39 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":"114586242","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/ichqp46026.2020.9177927
{"title":"ICHQP 2020 Title and Author(s)","authors":"","doi":"10.1109/ichqp46026.2020.9177927","DOIUrl":"https://doi.org/10.1109/ichqp46026.2020.9177927","url":null,"abstract":"","PeriodicalId":436720,"journal":{"name":"2020 19th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"63 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":"121117780","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/ICHQP46026.2020.9177892
N. Watson, R. Watson, Tyler Paterson, G. Russell, Michael Ellerington, R. Langella
At present almost all the electric vehicle (EV) charging equipment is unidirectional, that is Grid-2-Vehic1e (G2V). There is great interest in bidirectional electric vehicle charging equipment due to the benefits this may bring. However, there is a lack of real experience and information regarding this technology. This paper reports on the first stage of a project to remedy this. The first stage is laboratory testing of the technology and the second is deployment and field experience over a year of the equipment’s use in a domestic home. As shown the harmonic performance of the bidirectional charger is very good.
{"title":"Power Quality of a bidirectional Electric Vehicle charger","authors":"N. Watson, R. Watson, Tyler Paterson, G. Russell, Michael Ellerington, R. Langella","doi":"10.1109/ICHQP46026.2020.9177892","DOIUrl":"https://doi.org/10.1109/ICHQP46026.2020.9177892","url":null,"abstract":"At present almost all the electric vehicle (EV) charging equipment is unidirectional, that is Grid-2-Vehic1e (G2V). There is great interest in bidirectional electric vehicle charging equipment due to the benefits this may bring. However, there is a lack of real experience and information regarding this technology. This paper reports on the first stage of a project to remedy this. The first stage is laboratory testing of the technology and the second is deployment and field experience over a year of the equipment’s use in a domestic home. As shown the harmonic performance of the bidirectional charger is very good.","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":"121365059","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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