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21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)最新文献

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A switched-mode three-phase three-level telecommunications rectifier 一种开关型三相三电平电信整流器
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794129
R. Gules, A. S. Martins, I. Barbi
{"title":"A switched-mode three-phase three-level telecommunications rectifier","authors":"R. Gules, A. S. Martins, I. Barbi","doi":"10.1109/INTLEC.1999.794129","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794129","url":null,"abstract":"This paper presents a high power factor three-phase three-level 6 kW rectifier. The rectifier is composed of two stages connected in series: a three-switch three-level pulse-width modulated (PWM) preregulator and a neutral-point-clamped zero-voltage-switching PWM DC-DC converter (NPC-ZVS-PWM). The structures chosen for both stages have a common capacitive center point that allows the three-level operation and a low blocking-voltage stress on all the power switches (half of DC-link voltage). The reduction of blocking voltage allows the use of low cost and low loss power devices, increasing the efficiency and the power density with reduced production cost.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124181121","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}
引用次数: 13
Developments in telecommunications networks 电讯网络的发展
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.793997
H. Dyremose
{"title":"Developments in telecommunications networks","authors":"H. Dyremose","doi":"10.1109/INTLEC.1999.793997","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.793997","url":null,"abstract":"The modern information society is undergoing rapid development all over the world, although at different levels and at different pace. Telecommunications becomes an increasingly integrated part of societies, and advanced and reliable telecommunications systems are therefore crucial. Diversified services are developed to satisfy the ever-increasing demands for individual solutions, and terminal equipment will evolve in terms of functionality, miniaturisation and decreasing power consumption. Mobility, bandwidth, reliability and ease of use become key requirements. To support all this, telecommunications networks will have to offer still more differentiated access modes, based on a multitude of technologies.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131161185","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}
引用次数: 0
Premature capacity loss, an overlooked phenomenon in telecom batteries 过早的容量损失是电信电池中一个被忽视的现象
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794105
G. Karlsson
{"title":"Premature capacity loss, an overlooked phenomenon in telecom batteries","authors":"G. Karlsson","doi":"10.1109/INTLEC.1999.794105","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794105","url":null,"abstract":"Premature capacity loss (PCL) has been known in the field of lead-acid batteries for cyclic applications for a long time. Little is described about its occurrence in telecommunication applications. PCL is used to describe a rather abrupt capacity degradation that occurs without apparent physical effects inside the battery. PCL is apparent during the discharge where the voltage suddenly drops and can go down to very low values early in the discharge; however the cells will not reverse. PCL is not due to dry-out or undercharging. Cells affected with PCL will not recover: (a) when treated with equalization charge; or (b) when treated with additional water. However PCL cells will recover when treated with a reconditioning discharge. This paper exemplifies this with some data from the author's in-house reference batteries. The paper also transfers some general findings from other fields of lead-acid battery science where this phenomenon has been studied in more detail. It is the conclusion of the author that PCL is best treated by changing the design of the batteries themselves.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130868477","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}
引用次数: 2
Telematics applications potential in energy management 远程信息处理在能源管理中的应用潜力
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794078
R. Grunwald, M. Knoll, A. McCullough, G. Marsh
{"title":"Telematics applications potential in energy management","authors":"R. Grunwald, M. Knoll, A. McCullough, G. Marsh","doi":"10.1109/INTLEC.1999.794078","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794078","url":null,"abstract":"The objective of this study is to evaluate the need and potential for telematics applications in the area of energy and natural resource management. The key question being addressed is-How can telematics support and encourage sustainable development across Europe in the field of energy and natural resource management?.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114794418","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}
引用次数: 0
Usage of the solar energy from the photovoltaic panels for the generation of electrical energy 利用太阳能从光伏板产生电能
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794089
D. Cruz Martins, R. Demonti, I. Barbi
{"title":"Usage of the solar energy from the photovoltaic panels for the generation of electrical energy","authors":"D. Cruz Martins, R. Demonti, I. Barbi","doi":"10.1109/INTLEC.1999.794089","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794089","url":null,"abstract":"This paper presents the analysis of a static conversion system for treatment of the solar energy from photovoltaic panels. This system is interconnected with the mains power supply, contributing to the generation of the electrical energy. The power structure is composed by a current-fed push-pull converter, a buck converter and a current inverter. The main features of the system are: simple control strategy, robustness, lower harmonic distortion of the current and natural isolation. The principle of operation, design procedure and experimental results are presented.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121657098","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}
引用次数: 24
Power systems design for earthquake conditions using computational simulation 地震条件下电力系统的计算模拟设计
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794083
B. Serban
{"title":"Power systems design for earthquake conditions using computational simulation","authors":"B. Serban","doi":"10.1109/INTLEC.1999.794083","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794083","url":null,"abstract":"Power systems for telecommunications applications are required to function in many cases at a high level of reliability in harsh environmental conditions of temperature, humidity, vibrations and earthquakes. The main objective of this paper is to discuss power systems design for earthquake compliance using seismic test simulations.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123215846","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}
引用次数: 0
A new switching loss reduced discontinuous PWM scheme for a unidirectional three-phase/switch/level boost-type PWM (VIENNA) rectifier 一种用于单相三相/开关/电平升压型PWM (VIENNA)整流器的降低开关损耗的间断PWM新方案
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794128
J. Kolar, U. Drofenik
{"title":"A new switching loss reduced discontinuous PWM scheme for a unidirectional three-phase/switch/level boost-type PWM (VIENNA) rectifier","authors":"J. Kolar, U. Drofenik","doi":"10.1109/INTLEC.1999.794128","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794128","url":null,"abstract":"In this paper the applicability of discontinuous modulation for a three-phase/switch/level PWM rectifier system is investigated. As an analysis of the voltage formation of the system shows, the clamping in intervals (in each case, of one bridge leg to one bus of the DC output circuit) being characteristic for discontinuous modulation can occur in regions lying symmetrically around the maxims of the related phase currents. This results in a maximum reduction of the switching power loss. The increase of the effective pulse frequency (as compared to continuous modulation for equal switching losses) made possible thereby is calculated analytically. Furthermore, by digital simulation the RMS value of the mains current harmonics resulting for discontinuous modulation and increased pulse frequency is determined in dependency on the modulation depth. Also, it is compared to the harmonic characteristic for harmonic optimal continuous modulation. The load on the power semiconductors and on the output capacitors (characterized by the RMS value and the amplitude of the low-frequency harmonics of the capacitor current) is included into the comparison of the modulation methods. Finally, the time shape of the phase modulation functions (to be provided for the control of the voltage formation of the system based on a subharmonic oscillation method) for discontinuous modulation is calculated and the control of the potential of the output voltage center point is discussed.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131359933","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}
引用次数: 41
Systems grounding: management and troubleshooting 系统接地:管理和故障排除
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794108
N. Korbel, N. Tullius, B. Ashdown
{"title":"Systems grounding: management and troubleshooting","authors":"N. Korbel, N. Tullius, B. Ashdown","doi":"10.1109/INTLEC.1999.794108","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794108","url":null,"abstract":"In recent years, increased local and global competition has led to revision of all aspects of 'life' in a telecommunication facility, including installation cost and maintenance of equipment grounding systems. In this ever-changing world, it is important to contain costs by eliminating all unnecessary expenses and reducing ongoing expenses, be they one-time (such as initial installation) or ongoing (such as occasional troubleshooting investigations, system expansion or periodic maintenance). By summarizing the authors' years of experience in auditing and troubleshooting telecommunication systems, this paper not only provides insight into the main issues that affect the ongoing operation of the network but also identifies the network trends and key elements of an audit that will help in planning and management of the network.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132747357","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}
引用次数: 0
Conductance measurements in relation to battery state of charge 与电池充电状态有关的电导测量
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794092
W.H. Edwards, A. Harrison, T. M. Wolstenholme
{"title":"Conductance measurements in relation to battery state of charge","authors":"W.H. Edwards, A. Harrison, T. M. Wolstenholme","doi":"10.1109/INTLEC.1999.794092","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794092","url":null,"abstract":"The use of conductance measurements as a means of accepting supplies of valve-regulated lead-acid (VRLA) cells and batteries has been investigated. The results of the work show that in general terms, the technique would not be suitable for supplies acceptance criteria, with more indicative information being available from open circuit voltage measurements. One reason for the given conclusion arises from the fact that new fully charged product has a large tolerance range for conductance values, (typically /spl plusmn/10%). A second reason arises from the effect of the electrolyte conductance upon the measured cell conductance as the electrolyte changes its concentration during operating conditions. An explanation for the electrolyte conductance effect is given in respect of a cell's state of charge during open circuit and also during discharge conditions.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133303762","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}
引用次数: 6
A new, soft-switched, high-power-factor boost converter with IGBTs 一种带有igbt的新型软开关高功率因数升压变换器
21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007) Pub Date : 1999-06-09 DOI: 10.1109/INTLEC.1999.794048
Y. Jang, M. Jovanovi
{"title":"A new, soft-switched, high-power-factor boost converter with IGBTs","authors":"Y. Jang, M. Jovanovi","doi":"10.1109/INTLEC.1999.794048","DOIUrl":"https://doi.org/10.1109/INTLEC.1999.794048","url":null,"abstract":"A new soft-switching technique that improves performance of the high-power-factor boost rectifier by reducing switching losses is introduced. The losses are reduced by an active snubber which consists of an inductor, capacitor, rectifier, and an auxiliary switch. Since the boost switch turns off with zero current, this technique is well suited for implementations with insulated-gate bipolar transistors. The reverse-recovery-related losses of the rectifier are also reduced by the snubber inductor which is connected in series with the boost switch and the boost rectifier. In addition, the auxiliary switch operates with zero-voltage switching. A complete design procedure and extensive performance evaluation of the proposed active snubber using a 1.2 kW prototype operating from a 90 V/sub rms/-265 V/sub rms/ input are also presented.","PeriodicalId":215980,"journal":{"name":"21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130995577","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}
引用次数: 44
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