Pub Date : 1900-01-01DOI: 10.1109/IPEC.2005.207018
C. Jaipradidtham
This paper presents the probability parameter estimating due to outage rate effects for lightning overvoltage analysis on 500 kV EHV double circuit transmission lines of type DL3deg and DT20deg by using neural networks. This research begins for parameter determining the critical flashover voltage: (CFO) required for a given lightning surge performance level is given. If the surge voltage varies along the line, the insulation of system from fault effect. This fault line will have a number of stroke on overhead ground wire. The maximum voltage from flashover effects in the lines. The Gaussian frequency of occurrence of surge voltage, the extreme value distribution, the critical stroke current. An artificial neural network can shorten the probability of flashover at tower and the outage rate. Estimation of the parameter using program give the results which are reliability of 500 kV double circuit transmission lines designs efficiently
{"title":"Probability parameter estimation of outage rate effects for lightning overvoltage analysis on 500 kV EHV double circuit transmission lines using neural networks","authors":"C. Jaipradidtham","doi":"10.1109/IPEC.2005.207018","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207018","url":null,"abstract":"This paper presents the probability parameter estimating due to outage rate effects for lightning overvoltage analysis on 500 kV EHV double circuit transmission lines of type DL3deg and DT20deg by using neural networks. This research begins for parameter determining the critical flashover voltage: (CFO) required for a given lightning surge performance level is given. If the surge voltage varies along the line, the insulation of system from fault effect. This fault line will have a number of stroke on overhead ground wire. The maximum voltage from flashover effects in the lines. The Gaussian frequency of occurrence of surge voltage, the extreme value distribution, the critical stroke current. An artificial neural network can shorten the probability of flashover at tower and the outage rate. Estimation of the parameter using program give the results which are reliability of 500 kV double circuit transmission lines designs efficiently","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121653798","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207049
F. Luo
Power factor correction (PFC) is the capacity of generating or absorbing the reactive power produced by a load. The major industrial loads have an inductive power factor. The current tends to go beyond the power is usually used for the power conversion. This paper introduces a forward single-stage power factor correction AC/DC converter which effectively improves the power factor up to PF = 0.999. The simulation and experimental results verified our design
{"title":"Single-stage power factor correction AC/DC converter","authors":"F. Luo","doi":"10.1109/IPEC.2005.207049","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207049","url":null,"abstract":"Power factor correction (PFC) is the capacity of generating or absorbing the reactive power produced by a load. The major industrial loads have an inductive power factor. The current tends to go beyond the power is usually used for the power conversion. This paper introduces a forward single-stage power factor correction AC/DC converter which effectively improves the power factor up to PF = 0.999. The simulation and experimental results verified our design","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123749045","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207023
N. Lokhande, V. Jape, P.R. Khatri
A novel centroid based pulse width modulation (PWM) switching strategy is proposed for full bridge inverter application. The objective of new switching strategy is to minimize both the THD and lower order harmonics. The proposed approach provides better performance in terms of improved THD and lower order harmonics when compared to other conventional PWM techniques. The centroid based technique (CBT) described here in is to give a high quality inverter output waveform without leading to significant switching losses. In the proposed centroid based switching strategy, the width of each switching pulse is proportional to the corresponding area of the sampled reference waveform while the position of each pulse in the time domain is aligned with the centroid of the corresponding area of the sampled reference waveform
{"title":"A centroid based PWM switching technique for harmonic reduction of full bridge inverter","authors":"N. Lokhande, V. Jape, P.R. Khatri","doi":"10.1109/IPEC.2005.207023","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207023","url":null,"abstract":"A novel centroid based pulse width modulation (PWM) switching strategy is proposed for full bridge inverter application. The objective of new switching strategy is to minimize both the THD and lower order harmonics. The proposed approach provides better performance in terms of improved THD and lower order harmonics when compared to other conventional PWM techniques. The centroid based technique (CBT) described here in is to give a high quality inverter output waveform without leading to significant switching losses. In the proposed centroid based switching strategy, the width of each switching pulse is proportional to the corresponding area of the sampled reference waveform while the position of each pulse in the time domain is aligned with the centroid of the corresponding area of the sampled reference waveform","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"281 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116567345","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207008
F. Song, T. Bi, Q.X. Yang
In this paper, the state of the arts of power systems in China and some applications in transient stability control based on wide area measurement system (WAMS) are introduced briefly. With the development of power grid interconnection and transmission utility deregulation, the operation of electric power system become more and more complex, which challenges the security and transient stability control of power systems. The advent of WAMS opens a new path to the system trajectory prediction and real time closed-loop stability control to prevent power system outage. The defects of current transient stability control system are analyzed, then a possible scheme of transient stability control based on WAMS is proposed, and the corresponding future work is put forward as well. Finally, a new way of solving cascading events is discussed
{"title":"Study on wide area measurement system based transient stability control for power system","authors":"F. Song, T. Bi, Q.X. Yang","doi":"10.1109/IPEC.2005.207008","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207008","url":null,"abstract":"In this paper, the state of the arts of power systems in China and some applications in transient stability control based on wide area measurement system (WAMS) are introduced briefly. With the development of power grid interconnection and transmission utility deregulation, the operation of electric power system become more and more complex, which challenges the security and transient stability control of power systems. The advent of WAMS opens a new path to the system trajectory prediction and real time closed-loop stability control to prevent power system outage. The defects of current transient stability control system are analyzed, then a possible scheme of transient stability control based on WAMS is proposed, and the corresponding future work is put forward as well. Finally, a new way of solving cascading events is discussed","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"127 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114000906","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206909
M. Choudhry, W. Zada
There are a variety of techniques developed in order to improve the efficiency of electrical systems and reduce cost of providing electricity to the consumer. In this paper, a simplistic technique for power factor capacity calculation in medium-sized industrial/commercial setups is presented. Various loads of similar nominal power factor are categorized and demand factor of loads is so selected that it has engineering justifications. The proposed system works on principle of low voltage power factor correction, which substantially reduces electricity bill and increases electrical system loading capacity. It allows commercial and industrial consumers to save on their power cost appreciably. This work is augmented by application software, which takes a few inputs and produces numerous useful results. Adoption of this system helps user in computing compensation capacity, system KVA (size of transformer) and cost of compensation. A feature of this system is prediction of low PF penalty. Moreover, it also suggests the tentative payback period
{"title":"A simplistic technique for power factor compensation capacity calculation in medium size industry","authors":"M. Choudhry, W. Zada","doi":"10.1109/IPEC.2005.206909","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206909","url":null,"abstract":"There are a variety of techniques developed in order to improve the efficiency of electrical systems and reduce cost of providing electricity to the consumer. In this paper, a simplistic technique for power factor capacity calculation in medium-sized industrial/commercial setups is presented. Various loads of similar nominal power factor are categorized and demand factor of loads is so selected that it has engineering justifications. The proposed system works on principle of low voltage power factor correction, which substantially reduces electricity bill and increases electrical system loading capacity. It allows commercial and industrial consumers to save on their power cost appreciably. This work is augmented by application software, which takes a few inputs and produces numerous useful results. Adoption of this system helps user in computing compensation capacity, system KVA (size of transformer) and cost of compensation. A feature of this system is prediction of low PF penalty. Moreover, it also suggests the tentative payback period","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131098886","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206929
Suwarno
This paper describes the results investigation on application of silicone compound coating of ceramic high voltage insulator. Pin ceramic insulators with operating voltage of 20 kV were used as samples. Novagard silicone grease was used as the coating compound. The effects of temperature, humidity and various artificial pollutants were investigated. The experimental results show that application of silicone compound coatings suppressed leakage currents significantly under contaminated environment. Under high humidity of more than 90 % higher leakage current and lower flash over voltage were observed. The coating on the wet-polluted insulators results in a very poor improvement of the insulator properties. This showed coating method affected the performance of the coating. Coating of ceramic insulator surface suppressed the magnitude as well as the harmonic content of the leakage current. At the same time it also increased the flash over voltage
{"title":"Suppression of leakage current and improving insulator voltage withstand using silicone compound coating","authors":"Suwarno","doi":"10.1109/IPEC.2005.206929","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206929","url":null,"abstract":"This paper describes the results investigation on application of silicone compound coating of ceramic high voltage insulator. Pin ceramic insulators with operating voltage of 20 kV were used as samples. Novagard silicone grease was used as the coating compound. The effects of temperature, humidity and various artificial pollutants were investigated. The experimental results show that application of silicone compound coatings suppressed leakage currents significantly under contaminated environment. Under high humidity of more than 90 % higher leakage current and lower flash over voltage were observed. The coating on the wet-polluted insulators results in a very poor improvement of the insulator properties. This showed coating method affected the performance of the coating. Coating of ceramic insulator surface suppressed the magnitude as well as the harmonic content of the leakage current. At the same time it also increased the flash over voltage","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121278239","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206930
P. Yutthagowith, N. Pattanadech, A. Kunakorn, S. Phoomvuthisarn
This paper presents verification of high voltage measuring systems by time convolutions between standard testing waveforms and unit step responses of the measuring systems. The waveforms under investigations are full lightning impulse voltage waveforms, tail-chopped lightning impulse voltage waveforms, front-chopped lightning impulse voltage waveforms and steep-front voltage waveforms according to IEC standards 60060-2 and 61211. This paper considers four different types of the measuring systems. The results show that this technique is applicable, and should be a useful method for impulse voltage measurements in a standard high voltage
{"title":"Accuracy verification of impulse voltage measuring systems by convolution methods","authors":"P. Yutthagowith, N. Pattanadech, A. Kunakorn, S. Phoomvuthisarn","doi":"10.1109/IPEC.2005.206930","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206930","url":null,"abstract":"This paper presents verification of high voltage measuring systems by time convolutions between standard testing waveforms and unit step responses of the measuring systems. The waveforms under investigations are full lightning impulse voltage waveforms, tail-chopped lightning impulse voltage waveforms, front-chopped lightning impulse voltage waveforms and steep-front voltage waveforms according to IEC standards 60060-2 and 61211. This paper considers four different types of the measuring systems. The results show that this technique is applicable, and should be a useful method for impulse voltage measurements in a standard high voltage","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127625792","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206891
Peng Wang, Yuhang Xiao
This paper presents direct traceable methods, proportional tree methods, to allocate and price the transmission usages among the users. The techniques are based on ac power flow solutions and proportional sharing principle. The price that a customer (or a transaction) has to pay is directly related to its actual use of transmission network. Proportional trees utilized in this technique clearly show routes of power flows from sources to customers. An example system is used to illustrate the techniques
{"title":"Transmission cost allocation using proportional tree methods","authors":"Peng Wang, Yuhang Xiao","doi":"10.1109/IPEC.2005.206891","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206891","url":null,"abstract":"This paper presents direct traceable methods, proportional tree methods, to allocate and price the transmission usages among the users. The techniques are based on ac power flow solutions and proportional sharing principle. The price that a customer (or a transaction) has to pay is directly related to its actual use of transmission network. Proportional trees utilized in this technique clearly show routes of power flows from sources to customers. An example system is used to illustrate the techniques","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"230 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133321937","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206965
A. Kazemi, A. Farahbakhsh
This paper proposes a method to determine active (P) and reactive power (Q) and torque of the low cost induction machine without shaft sensor. In this method, active and reactive powers are estimated from the dc-link current. Derivation of torque and flux is based on the estimation of active and reactive power. Reduction of number of sensors, simplifying the cabling and maintenance of the system are the advantages of this method. At the end, the accuracy of this method is compared with a conventional method
{"title":"Introducing a method to determine active and reactive power and torque of the induction machine without shaft sensor","authors":"A. Kazemi, A. Farahbakhsh","doi":"10.1109/IPEC.2005.206965","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206965","url":null,"abstract":"This paper proposes a method to determine active (P) and reactive power (Q) and torque of the low cost induction machine without shaft sensor. In this method, active and reactive powers are estimated from the dc-link current. Derivation of torque and flux is based on the estimation of active and reactive power. Reduction of number of sensors, simplifying the cabling and maintenance of the system are the advantages of this method. At the end, the accuracy of this method is compared with a conventional method","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130363828","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207020
S. Amrei, D. Xu, Y. Lang
DC/DC switching converters have been used in many applications in recent years. The sliding mode control based on VSS (variable structure system) theory has been examined for all switch mode converter types, whilst current mode (CM) control scheme is particularly applied to DC/DC converters. In this paper, a new control strategy by compromising both schemes and derivation of dynamic current reference is proposed, analyzed and simulated. Moreover, considerations for realization with DSP controllers are addressed
{"title":"High power DC-DC converters under large load and input voltage variations: a new approach","authors":"S. Amrei, D. Xu, Y. Lang","doi":"10.1109/IPEC.2005.207020","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207020","url":null,"abstract":"DC/DC switching converters have been used in many applications in recent years. The sliding mode control based on VSS (variable structure system) theory has been examined for all switch mode converter types, whilst current mode (CM) control scheme is particularly applied to DC/DC converters. In this paper, a new control strategy by compromising both schemes and derivation of dynamic current reference is proposed, analyzed and simulated. Moreover, considerations for realization with DSP controllers are addressed","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123243418","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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