Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88304
A. Caibis, C. Carrano, N. Lo Giudice, F. Sceusa, P. Piccirillo
MCS is a microprocessor device for the control, management, and monitoring of power plants, specified by SIP and designed by ITALTEL as part of the realization of a power plant supervision and control system. The device consists of a microcomputer, keyboard and display, and an I/O interface, of which the first two are standard, and the third dedicated for the particular plant. The nature of the structure simplifies man-machine interaction, permitting the management of plant and the displaying of measurements, apparatus status etc. on two levels: local by keyboard and display, and remote by linkage with the supervision center. The authors describe mCS, illustrating its structural and functional characteristics from both the hardware and software points of view.<>
{"title":"mCS: a control and supervision device for power plants","authors":"A. Caibis, C. Carrano, N. Lo Giudice, F. Sceusa, P. Piccirillo","doi":"10.1109/INTLEC.1989.88304","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88304","url":null,"abstract":"MCS is a microprocessor device for the control, management, and monitoring of power plants, specified by SIP and designed by ITALTEL as part of the realization of a power plant supervision and control system. The device consists of a microcomputer, keyboard and display, and an I/O interface, of which the first two are standard, and the third dedicated for the particular plant. The nature of the structure simplifies man-machine interaction, permitting the management of plant and the displaying of measurements, apparatus status etc. on two levels: local by keyboard and display, and remote by linkage with the supervision center. The authors describe mCS, illustrating its structural and functional characteristics from both the hardware and software points of view.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"290 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123746046","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88245
L. Fiorella, F. Guglielmo, S. Lentini, M. Grossoni
A medium-power (800 A, 48/60 V) power plant for the continuous supply of telephone exchanges has been designed and constructed. Besides great versatility, this power plant features advanced ideas in its diagnostics and for setting the various control intervention thresholds. Particular attention is drawn to the use of a microprocessor device for power-plant management and for processing and to the presentation of all the data the operator needs for proper diagnosis of plant operation. A communications interface is integrated into the microprocessor device to allow connection to the supervision and control network.<>
为电话交换机的持续供电设计和建造了一个中等功率(800 A, 48/60 V)发电厂。除了多功能性外，该电厂在诊断和设置各种控制干预阈值方面具有先进的思想。应特别注意使用微处理机设备进行电厂管理和处理，以及提供操作员正确诊断电厂运行所需的所有数据。微处理器设备中集成了通信接口，可以连接到监控网络。
{"title":"Microprocessor controlled medium-power power plant","authors":"L. Fiorella, F. Guglielmo, S. Lentini, M. Grossoni","doi":"10.1109/INTLEC.1989.88245","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88245","url":null,"abstract":"A medium-power (800 A, 48/60 V) power plant for the continuous supply of telephone exchanges has been designed and constructed. Besides great versatility, this power plant features advanced ideas in its diagnostics and for setting the various control intervention thresholds. Particular attention is drawn to the use of a microprocessor device for power-plant management and for processing and to the presentation of all the data the operator needs for proper diagnosis of plant operation. A communications interface is integrated into the microprocessor device to allow connection to the supervision and control network.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"1998 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123551437","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88352
P. Redi
The author considers the control optimization of stand-alone PV (photovoltaic) systems in order to maximize the charging of the battery. The standard control algorithm based on the voltage of the battery as a charge indicator is replaced by an intelligent processor which observes the battery status at the end of the night to make a decision about the regulation during he following day. An experimental controller has been field-tested and has demonstrated high energy efficiency and capability during its entire lifetime.<>
{"title":"The regulation of stand alone photovoltaic systems","authors":"P. Redi","doi":"10.1109/INTLEC.1989.88352","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88352","url":null,"abstract":"The author considers the control optimization of stand-alone PV (photovoltaic) systems in order to maximize the charging of the battery. The standard control algorithm based on the voltage of the battery as a charge indicator is replaced by an intelligent processor which observes the battery status at the end of the night to make a decision about the regulation during he following day. An experimental controller has been field-tested and has demonstrated high energy efficiency and capability during its entire lifetime.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115538956","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88367
D. Caputo, F. Irrera, F. Palma
A novel analytical method has been developed for studying the transport problem in a hydrogenated amorphous silicon (a-Si:H) p-i-n solar cell. The model relies on the widely used assumption of a variable minority carrier but, unlike other analytical models, it takes into account both the majority and the minority carriers in the whole structure. Thus, exact boundary conditions can be applied to carriers and currents at the interfaces. Photocarrier generation, too, is analytically treated as a nonhomogeneous term. In order to improve the model, the authors assume hyperbolic expression of the electric field in the intrinsic region. Self-consistent determination of the field profile is obtained, minimizing the error related to the hyperbolic approximation.<>
{"title":"A new analytical model of the p-i-n structure for a-Si:H solar cell","authors":"D. Caputo, F. Irrera, F. Palma","doi":"10.1109/INTLEC.1989.88367","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88367","url":null,"abstract":"A novel analytical method has been developed for studying the transport problem in a hydrogenated amorphous silicon (a-Si:H) p-i-n solar cell. The model relies on the widely used assumption of a variable minority carrier but, unlike other analytical models, it takes into account both the majority and the minority carriers in the whole structure. Thus, exact boundary conditions can be applied to carriers and currents at the interfaces. Photocarrier generation, too, is analytically treated as a nonhomogeneous term. In order to improve the model, the authors assume hyperbolic expression of the electric field in the intrinsic region. Self-consistent determination of the field profile is obtained, minimizing the error related to the hyperbolic approximation.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121173527","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88324
J. Pompon, J. Bouet
The oxygen recombination mechanism which allows lead batteries to be sealed, and causes of water loss, have been closely studied in order to make the large-scale manufacture of this battery possible and to ensure that it develops into a safe mass-consumer product. A detailed theoretical description of the recombination mechanisms is presented.<>
{"title":"Sealed lead-acid batteries gas-recombination mechanisms","authors":"J. Pompon, J. Bouet","doi":"10.1109/INTLEC.1989.88324","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88324","url":null,"abstract":"The oxygen recombination mechanism which allows lead batteries to be sealed, and causes of water loss, have been closely studied in order to make the large-scale manufacture of this battery possible and to ensure that it develops into a safe mass-consumer product. A detailed theoretical description of the recombination mechanisms is presented.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121970812","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88341
A. Bhat
A modified series-parallel high-frequency resonant DC/DC power converter configuration suitable for 48 V output is proposed. A simplified steady-state analysis using complex circuit analysis is presented. Based on the analysis, a simple design procedure is given. Detailed experimental results obtained from a MOSFET-based 1 kW converter are presented to verify the analysis. The converter presented has almost constant efficiency from full load to quarter load. The variation in switching frequency required to regulate the output voltage constant is narrow, and the converter has load short-circuit capability.<>
{"title":"A 48 V output DC-to-DC resonant converter suitable for telecommunication applications","authors":"A. Bhat","doi":"10.1109/INTLEC.1989.88341","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88341","url":null,"abstract":"A modified series-parallel high-frequency resonant DC/DC power converter configuration suitable for 48 V output is proposed. A simplified steady-state analysis using complex circuit analysis is presented. Based on the analysis, a simple design procedure is given. Detailed experimental results obtained from a MOSFET-based 1 kW converter are presented to verify the analysis. The converter presented has almost constant efficiency from full load to quarter load. The variation in switching frequency required to regulate the output voltage constant is narrow, and the converter has load short-circuit capability.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122028925","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88259
V. Dello Spedale, G. Airoldi, A.A. D'Anna
It is noted that a break in the air-conditioning system of an electronically equipped telephone exchange, if not immediately repaired, can cause heavy damage and, ultimately, breakdown. The authors describe the method used by SIP for the air-conditioning of electronic telephone exchanges, particularly the latest experience, using programmable logic controllers equipped with communication modules connected by means of a telephone network to remote stations, for control and operation of the equipment used in telephone-exchange air conditioning. Attention is given to the maintenance and energy consumption of the air-conditioning plants.<>
{"title":"SIP experiences in air conditioning of telephone exchanges","authors":"V. Dello Spedale, G. Airoldi, A.A. D'Anna","doi":"10.1109/INTLEC.1989.88259","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88259","url":null,"abstract":"It is noted that a break in the air-conditioning system of an electronically equipped telephone exchange, if not immediately repaired, can cause heavy damage and, ultimately, breakdown. The authors describe the method used by SIP for the air-conditioning of electronic telephone exchanges, particularly the latest experience, using programmable logic controllers equipped with communication modules connected by means of a telephone network to remote stations, for control and operation of the equipment used in telephone-exchange air conditioning. Attention is given to the maintenance and energy consumption of the air-conditioning plants.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122132381","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88288
G. Baudo, G.B. Cecchinato, M. Grossoni
The laboratory and field behavior of Monolite valve-regulated SLA (sealed lead-acid) batteries for stand-by applications is reviewed from the standpoint of critical components and performance. It is shown how design and production approaches must be carefully selected and approved because of the peculiarities of the 'starved' as compared to the 'flooded' lead-acid system. It is concluded that once the critical parameters have been identified and corrective measures taken a life-expectancy of ten years for these batteries can be confidently achieved.<>
{"title":"Field and laboratory experience of valve-regulated SLA batteries for stand-by applications","authors":"G. Baudo, G.B. Cecchinato, M. Grossoni","doi":"10.1109/INTLEC.1989.88288","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88288","url":null,"abstract":"The laboratory and field behavior of Monolite valve-regulated SLA (sealed lead-acid) batteries for stand-by applications is reviewed from the standpoint of critical components and performance. It is shown how design and production approaches must be carefully selected and approved because of the peculiarities of the 'starved' as compared to the 'flooded' lead-acid system. It is concluded that once the critical parameters have been identified and corrective measures taken a life-expectancy of ten years for these batteries can be confidently achieved.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129549669","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88303
S. Delfiore, G. Franceschini, C. Tassoni
The possibility is studied of UPS (uninterruptible power supply) control based on the voltage vector referred to a rotating reference frame with velocity corresponding to voltage pulsation and on voltage pulsation itself. To verify the feasibility of the control strategy, a digital SPICE-aided simulation is reported. The numerical results show that, with an asymmetrical load, a pulsation ripple is present owing to the nonsinusoidal voltage waveforms. Nevertheless, the computer harmonic distortion values are acceptable.<>
{"title":"SPICE aided analysis of UPS vector control","authors":"S. Delfiore, G. Franceschini, C. Tassoni","doi":"10.1109/INTLEC.1989.88303","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88303","url":null,"abstract":"The possibility is studied of UPS (uninterruptible power supply) control based on the voltage vector referred to a rotating reference frame with velocity corresponding to voltage pulsation and on voltage pulsation itself. To verify the feasibility of the control strategy, a digital SPICE-aided simulation is reported. The numerical results show that, with an asymmetrical load, a pulsation ripple is present owing to the nonsinusoidal voltage waveforms. Nevertheless, the computer harmonic distortion values are acceptable.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131754009","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 : 1989-10-15DOI: 10.1109/INTLEC.1989.88332
L. Barone, N. Brusca, C. Di Miceli, G. Patti, M. Grossoni
The authors describe a continuous supply unit using 40 kVA PWM (pulse-width modulation) inverters, which has been designed to provide variable output power, up to 200 kVA, for the processing systems in telecommunication networks. The system configuration includes at least one and up to 5+1 parallel rectifiers, at least one and up to 5+1 parallel inverters, battery, DC power switchboard system, and AC continuity switchboard. Two important characteristics of the system-in addition to its high reliability, maintainability, operability, and excellent dynamic and static performances-are its capacity for extension without interruption to the user supply, and the presence of a safety device that prevents return of power towards the emergency network in the event of failure.<>
{"title":"200 kVA continuous three-phase supply system","authors":"L. Barone, N. Brusca, C. Di Miceli, G. Patti, M. Grossoni","doi":"10.1109/INTLEC.1989.88332","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88332","url":null,"abstract":"The authors describe a continuous supply unit using 40 kVA PWM (pulse-width modulation) inverters, which has been designed to provide variable output power, up to 200 kVA, for the processing systems in telecommunication networks. The system configuration includes at least one and up to 5+1 parallel rectifiers, at least one and up to 5+1 parallel inverters, battery, DC power switchboard system, and AC continuity switchboard. Two important characteristics of the system-in addition to its high reliability, maintainability, operability, and excellent dynamic and static performances-are its capacity for extension without interruption to the user supply, and the presence of a safety device that prevents return of power towards the emergency network in the event of failure.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"305 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131445402","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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