Pub Date : 2014-05-25DOI: 10.1109/ICHQP.2014.6842919
Yu Tian, Wilsun Xu
Capacitor switching transients is an important power quality concern. The power quality impact of a capacitor switching event is traditionally evaluated with the Electromagnetic transients (EMT) simulation program. This requires the creation of EMT cases for studying the event, which can be a very time consuming process. All utility companies conduct load flow and short-circuit studies for their systems and cases are always available for such studies. This paper presents an idea to conduct capacitor switching study using short-circuit program. The proposed method can be integrated into the program, resulting in significant saving of engineering time for capacitor switching studies. The proposed method conducts transients studies in frequency (harmonic) domain. It models a capacitor switching event as a harmonic voltage source. Short-circuit calculation method is used to establish the frequency-responses of the study system.
{"title":"A method to calculate capacitor switching transients using short-circuit programs","authors":"Yu Tian, Wilsun Xu","doi":"10.1109/ICHQP.2014.6842919","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842919","url":null,"abstract":"Capacitor switching transients is an important power quality concern. The power quality impact of a capacitor switching event is traditionally evaluated with the Electromagnetic transients (EMT) simulation program. This requires the creation of EMT cases for studying the event, which can be a very time consuming process. All utility companies conduct load flow and short-circuit studies for their systems and cases are always available for such studies. This paper presents an idea to conduct capacitor switching study using short-circuit program. The proposed method can be integrated into the program, resulting in significant saving of engineering time for capacitor switching studies. The proposed method conducts transients studies in frequency (harmonic) domain. It models a capacitor switching event as a harmonic voltage source. Short-circuit calculation method is used to establish the frequency-responses of the study system.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"281 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":"126952521","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.2014.6842802
Ionut Bogdan Stoenescu, S. Costinas, G. Chicco
In this paper is presented an Axial-Flux Permanent Magnet Synchronous Generator with disc-shaped magnets and internal coreless stator for low power applications. Disc-shaped magnets are not usually used in the construction of PM machines. This research will emphasize the advantages and disadvantages of using this type of magnets. In addition, the 2D simulation of the machine will be compared with 3D simulation of it. The simulations of the generator were performed in no-load conditions.
{"title":"The simulation of an Axial-Flux Permanent Magnet Synchronous Generator in no-load condition","authors":"Ionut Bogdan Stoenescu, S. Costinas, G. Chicco","doi":"10.1109/ICHQP.2014.6842802","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842802","url":null,"abstract":"In this paper is presented an Axial-Flux Permanent Magnet Synchronous Generator with disc-shaped magnets and internal coreless stator for low power applications. Disc-shaped magnets are not usually used in the construction of PM machines. This research will emphasize the advantages and disadvantages of using this type of magnets. In addition, the 2D simulation of the machine will be compared with 3D simulation of it. The simulations of the generator were performed in no-load conditions.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"55 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":"129523174","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.2014.6842788
Roger Samuel Zulpo, Roberto Chouhy Leborgne, Arturo Suman Bretas
This work aims at the optimal siting and sizing of distributed generation (DG) in distribution feeders. It is used an objective function which computes a penalty for voltage deviation in each bus coupled with the active power losses of the system. In this way, it is considered the equality and inequality constraints concerning the power flow, total apparent power of DG, number of installed DGs, fixed or variable power factor and voltage limits. To this end, it is implemented a nonlinear programming model with discontinuous derivatives, which employs binary variables to define the location of the generation through a classical optimization approach.
{"title":"Optimal siting and sizing of distributed generation through power losses and voltage deviation","authors":"Roger Samuel Zulpo, Roberto Chouhy Leborgne, Arturo Suman Bretas","doi":"10.1109/ICHQP.2014.6842788","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842788","url":null,"abstract":"This work aims at the optimal siting and sizing of distributed generation (DG) in distribution feeders. It is used an objective function which computes a penalty for voltage deviation in each bus coupled with the active power losses of the system. In this way, it is considered the equality and inequality constraints concerning the power flow, total apparent power of DG, number of installed DGs, fixed or variable power factor and voltage limits. To this end, it is implemented a nonlinear programming model with discontinuous derivatives, which employs binary variables to define the location of the generation through a classical optimization approach.","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":"129251817","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.2014.6842850
G. D'Antona, R. Faranda, H. Hafezi, G. Accetta, D. Della Giustina
The paper represents power electronics device for PQ improvement and introduces Open UPQC as possible solution to improve whole system PQ level with more features for specific end users. It focuses on shunt unit analysis and performance. Realization of prototype and design consideration are analyzed in detail and different operation modes of the system are described.
{"title":"Open UPQC: A possible solution for customer power quality improvement. Shunt unit analysis","authors":"G. D'Antona, R. Faranda, H. Hafezi, G. Accetta, D. Della Giustina","doi":"10.1109/ICHQP.2014.6842850","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842850","url":null,"abstract":"The paper represents power electronics device for PQ improvement and introduces Open UPQC as possible solution to improve whole system PQ level with more features for specific end users. It focuses on shunt unit analysis and performance. Realization of prototype and design consideration are analyzed in detail and different operation modes of the system are described.","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":"129735364","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.2014.6842770
V. Ćuk, W. Kling, J. Cobben, P. Ribeiro
Voltage and current distortion, in most countries, are presently limited by national standards which adopt or adapt the compatibility levels and emission limits of the IEC 61000 series of standards, or the proposed values of the IEEE 519 standard. This paper presents a review of international limits for public networks. Shortcomings of these standards are pointed out and some propositions for improvements are given.
{"title":"A review of international limits for harmonic voltages and currents in public networks","authors":"V. Ćuk, W. Kling, J. Cobben, P. Ribeiro","doi":"10.1109/ICHQP.2014.6842770","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842770","url":null,"abstract":"Voltage and current distortion, in most countries, are presently limited by national standards which adopt or adapt the compatibility levels and emission limits of the IEC 61000 series of standards, or the proposed values of the IEEE 519 standard. This paper presents a review of international limits for public networks. Shortcomings of these standards are pointed out and some propositions for improvements are given.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"8 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":"130651486","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.2014.6842881
S. Aleem, M. Balci, A. Zobaa, S. Sakar
Transformers and cables have overheating and reduced loading capabilities under non-sinusoidal conditions due to the fact that their losses increases with not only rms value but also frequency of the load current. In this paper, it is aimed to employ passive filters for effective utilization of the cables and transformers in the harmonically contaminated power systems. To attain this goal, an optimal passive filter design approach is provided to maximize the power factor definition, which takes into account frequency-dependent losses of the power transmission and distribution equipment, under non-sinusoidal conditions. The obtained simulation results show that the proposed approach has a considerable advantage on the reduction of the total transmission loss and the transformer loading capability under non-sinusoidal conditions when compared to the traditional optimal filter design approach, which aims to maximize classical power factor definition. On the other hand, for the simulated system cases, both approaches lead to almost the same current carrying (or loading) capability value of the cables.
{"title":"Optimal passive filter design for effective utilization of cables and transformers under non-sinusoidal conditions","authors":"S. Aleem, M. Balci, A. Zobaa, S. Sakar","doi":"10.1109/ICHQP.2014.6842881","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842881","url":null,"abstract":"Transformers and cables have overheating and reduced loading capabilities under non-sinusoidal conditions due to the fact that their losses increases with not only rms value but also frequency of the load current. In this paper, it is aimed to employ passive filters for effective utilization of the cables and transformers in the harmonically contaminated power systems. To attain this goal, an optimal passive filter design approach is provided to maximize the power factor definition, which takes into account frequency-dependent losses of the power transmission and distribution equipment, under non-sinusoidal conditions. The obtained simulation results show that the proposed approach has a considerable advantage on the reduction of the total transmission loss and the transformer loading capability under non-sinusoidal conditions when compared to the traditional optimal filter design approach, which aims to maximize classical power factor definition. On the other hand, for the simulated system cases, both approaches lead to almost the same current carrying (or loading) capability value of the cables.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"41 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":"123344045","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.2014.6842876
Joe Letef, Saud Al-Shammari, G. Fotiou, Don E. Martin
One of Saudi Aramco's gas exploration expansion plans consists of powering an offshore platform via a 13.8 kV, 56 km subsea cable. Under various loading conditions on the offshore platform, voltage fluctuation and control becomes problematic. The installation of a 13.8 kV shunt capacitor bank (SCB) and shunt reactor bank (SRB), was initially introduced to remedy voltage control. During transient analysis, under faulty conditions adjacent to the SCB, the 13.8 kV circuit breaker (CB) will be exposed to an excessive transient recovery voltage (TRV) exceeding the limit of the 13.8 kV CB. The harmonic analysis also indicated high values on the 5th, 7th and 11th harmonic voltage distortion. A comprehensive power system analysis was undertaken to investigate mitigation measures. The installation of a Static Synchronous Shunt Compensator (STATCOM) was retained as it will eliminate the need of a SCB and SRB with the high TRVs and resolve the harmonic problems.
{"title":"Transient recovery voltage on the 13.8 kV subsea cable feeding a Saudi Aramco offshore platform","authors":"Joe Letef, Saud Al-Shammari, G. Fotiou, Don E. Martin","doi":"10.1109/ICHQP.2014.6842876","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842876","url":null,"abstract":"One of Saudi Aramco's gas exploration expansion plans consists of powering an offshore platform via a 13.8 kV, 56 km subsea cable. Under various loading conditions on the offshore platform, voltage fluctuation and control becomes problematic. The installation of a 13.8 kV shunt capacitor bank (SCB) and shunt reactor bank (SRB), was initially introduced to remedy voltage control. During transient analysis, under faulty conditions adjacent to the SCB, the 13.8 kV circuit breaker (CB) will be exposed to an excessive transient recovery voltage (TRV) exceeding the limit of the 13.8 kV CB. The harmonic analysis also indicated high values on the 5th, 7th and 11th harmonic voltage distortion. A comprehensive power system analysis was undertaken to investigate mitigation measures. The installation of a Static Synchronous Shunt Compensator (STATCOM) was retained as it will eliminate the need of a SCB and SRB with the high TRVs and resolve the harmonic problems.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"31 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":"121518771","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.2014.6842801
S. Gheorghe, N. Golovanov, H. Albert, C. Stanescu, D. Ilişiu
The paper presents a relationship among three important concepts: Power quality, Energy efficiency and Performance of the company operating in energy field. In most of cases, the improvement of Power quality determines an increase of the Energy efficiency and, of course, the increasing of the performance of the company. The balancing between two of them, could give us the optimum solution to act in the strategic plan, which will be implemented. Some ideas for meeting of the scope of each company operating in the energy sector, increasing the performance of the company, are presented in this paper.
{"title":"The management of Power quality, Energy efficiency and the performance of the companies","authors":"S. Gheorghe, N. Golovanov, H. Albert, C. Stanescu, D. Ilişiu","doi":"10.1109/ICHQP.2014.6842801","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842801","url":null,"abstract":"The paper presents a relationship among three important concepts: Power quality, Energy efficiency and Performance of the company operating in energy field. In most of cases, the improvement of Power quality determines an increase of the Energy efficiency and, of course, the increasing of the performance of the company. The balancing between two of them, could give us the optimum solution to act in the strategic plan, which will be implemented. Some ideas for meeting of the scope of each company operating in the energy sector, increasing the performance of the company, are presented in this paper.","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":"131386806","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.2014.6842918
S. Elphick, V. Gosbell, V. Smith, G. Drury, R. Barr
IEC standards suggest that a network is compliant if 95% of the sites are compliant. In many cases it is only practical to measure the PQ parameters of some of the sites in a network and to use statistical analysis. The paper examines the minimum number of monitored sites needed to demonstrate compliance with a prescribed degree of confidence - e.g. at the 95% confidence level. Analysis is made of samples extracted randomly from sites included in the Australian Long Term National PQ Survey. The required number of sites is found to vary with the PQ disturbance of concern and is largest with voltage unbalance. In all cases the number exceeds that proposed in CEER guidelines.
{"title":"Assessing network compliance for power quality performance","authors":"S. Elphick, V. Gosbell, V. Smith, G. Drury, R. Barr","doi":"10.1109/ICHQP.2014.6842918","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842918","url":null,"abstract":"IEC standards suggest that a network is compliant if 95% of the sites are compliant. In many cases it is only practical to measure the PQ parameters of some of the sites in a network and to use statistical analysis. The paper examines the minimum number of monitored sites needed to demonstrate compliance with a prescribed degree of confidence - e.g. at the 95% confidence level. Analysis is made of samples extracted randomly from sites included in the Australian Long Term National PQ Survey. The required number of sites is found to vary with the PQ disturbance of concern and is largest with voltage unbalance. In all cases the number exceeds that proposed in CEER guidelines.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"306 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131434211","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.2014.6842811
D. Ivan, G. Lăzăroiu, G. Ungureanu, O. Udrea
Lately, in operation of power system installation have found numerous perturbations affecting the normal functioning of connected users, mainly at 110 kV network, in vicinity of large disturbing users. The monitoring of power quality within the network nodes, which are connected directly disturbing users to the transmission network, allowed to know how specific the requirements on power quality and how quality parameters are within the limits permitted. Power quality problem on connecting wind farms to the electricity transmission network is currently very topical given the diversity of plants and induced risks - in each case - the deviations from normal operation.
{"title":"Influence on the power quality of the connection of wind power into the electricity grid transmission","authors":"D. Ivan, G. Lăzăroiu, G. Ungureanu, O. Udrea","doi":"10.1109/ICHQP.2014.6842811","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842811","url":null,"abstract":"Lately, in operation of power system installation have found numerous perturbations affecting the normal functioning of connected users, mainly at 110 kV network, in vicinity of large disturbing users. The monitoring of power quality within the network nodes, which are connected directly disturbing users to the transmission network, allowed to know how specific the requirements on power quality and how quality parameters are within the limits permitted. Power quality problem on connecting wind farms to the electricity transmission network is currently very topical given the diversity of plants and induced risks - in each case - the deviations from normal operation.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"82 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":"130459472","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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