Impulse corona discharge around the conductors and the overvoltage wave traveling on an overhead line were experimentally studied. Some of the experiments aimed at establishing a general relation for the charge-voltage characteristic of the coronal discharge around the conductors. During the tests four types of single conductors were used, with 0.010 m, 0.016 m, 0.031 m, and 0.065 m diameters, as well as three types of bundled conductors (with 2, 3, and 4 subconductors having a 0.031 m diameter, the distance between subconductors being 0.4 m). The applied voltage impulses had positive and negative polarity. After analyzing the experimental results and the computing relations, conclusions are drawn on the impulse corona discharge energy.<>
{"title":"Impulse corona discharge energy around the conductors","authors":"C. Gary, G. Dragan, I. Langu","doi":"10.1109/IAS.1990.152295","DOIUrl":"https://doi.org/10.1109/IAS.1990.152295","url":null,"abstract":"Impulse corona discharge around the conductors and the overvoltage wave traveling on an overhead line were experimentally studied. Some of the experiments aimed at establishing a general relation for the charge-voltage characteristic of the coronal discharge around the conductors. During the tests four types of single conductors were used, with 0.010 m, 0.016 m, 0.031 m, and 0.065 m diameters, as well as three types of bundled conductors (with 2, 3, and 4 subconductors having a 0.031 m diameter, the distance between subconductors being 0.4 m). The applied voltage impulses had positive and negative polarity. After analyzing the experimental results and the computing relations, conclusions are drawn on the impulse corona discharge energy.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133753906","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}
A modified pulse-width modulation (PWM) technique that improves the displacement power factor and the input power factor of a single-phase AC to DC converter is discussed. The modified converter is shown to have a high input power factor and allows the of DC voltage from zero to more than the maximum value of the source voltage. The displacement power factor is unity, and the input power factor is almost unity in the wide range of current command.<>
{"title":"A single-phase PWM controlled AC to DC converter based on control of unity displacement power factor","authors":"S. Funabiki","doi":"10.1109/IAS.1990.152308","DOIUrl":"https://doi.org/10.1109/IAS.1990.152308","url":null,"abstract":"A modified pulse-width modulation (PWM) technique that improves the displacement power factor and the input power factor of a single-phase AC to DC converter is discussed. The modified converter is shown to have a high input power factor and allows the of DC voltage from zero to more than the maximum value of the source voltage. The displacement power factor is unity, and the input power factor is almost unity in the wide range of current command.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115442557","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 real-time simulation of a synchronous machine in a microprocessor based programmable high-speed controller (PHSC) is presented. The simulation is based on the normalized equations of the machine in the d-q reference frame. The system presented can be used as a generator in HVDC simulation as well as to study the effects of various excitation control techniques. It can also be used as a motor simulator to study the various closed-loop control strategies in variable-speed drive applications. The dynamic behavior of the simulator is illustrated by results of open- and short-circuit tests, by network synchronization, and by response of excitation control.<>
{"title":"Real time simulation of a synchronous machine in a programmable high speed controller","authors":"K. Rajashekara, A. Rufer, L. Terens, G. Guth","doi":"10.1109/IAS.1990.152195","DOIUrl":"https://doi.org/10.1109/IAS.1990.152195","url":null,"abstract":"The real-time simulation of a synchronous machine in a microprocessor based programmable high-speed controller (PHSC) is presented. The simulation is based on the normalized equations of the machine in the d-q reference frame. The system presented can be used as a generator in HVDC simulation as well as to study the effects of various excitation control techniques. It can also be used as a motor simulator to study the various closed-loop control strategies in variable-speed drive applications. The dynamic behavior of the simulator is illustrated by results of open- and short-circuit tests, by network synchronization, and by response of excitation control.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116949566","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}
Fairly sophisticated controls are needed to achieve concurrent multiple objectives of pulse-width-modulation (PWM) converters. The objectives may include near-sinusoidal current waveforms, fine DC voltage or current regulation, and specified power factor. The use of a system of three high-speed digital signal processors to implement these controls in real time is described. The voltage angle lock loop control of a voltage source (boost-type) converter for a high-voltage direct-current system is presented. Experimental results confirm that the digitally controlled system can realize the full potential of the PWM converter.<>
{"title":"Concurrent microprocessors-based PWM converter control","authors":"Y. Guo, X. Wang, H. Lee, B. Ooi","doi":"10.1109/IAS.1990.152305","DOIUrl":"https://doi.org/10.1109/IAS.1990.152305","url":null,"abstract":"Fairly sophisticated controls are needed to achieve concurrent multiple objectives of pulse-width-modulation (PWM) converters. The objectives may include near-sinusoidal current waveforms, fine DC voltage or current regulation, and specified power factor. The use of a system of three high-speed digital signal processors to implement these controls in real time is described. The voltage angle lock loop control of a voltage source (boost-type) converter for a high-voltage direct-current system is presented. Experimental results confirm that the digitally controlled system can realize the full potential of the PWM converter.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123564506","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 design of a 5 kW utility-interactive high-performance series resonant inverter is described. The inverter operates in an inaudible frequency range (20 kHz-100 kHz) and in the quasi-resonant mode. The results of an analytical study of the inverter show that, in this mode of operation, the inverter output characteristics are of the current-source type independent of the output voltage of the AC utility. The inverter uses turn-on controllable COMFET switches in the soft commutation mode and does not require snubber circuits. This converter combines the advantages of working at high frequency (less weight, small reactive filters, and absence of low-frequency transformer) and of using resonant links that allow the use of zero-current turn-off switches. Some of the experimental and simulation results obtained on a 2.5 kW-capacity laboratory prototype are presented.<>
{"title":"A 5 kW utility-interactive inverter operating at high frequency and using zero current turn off COMFET switches","authors":"R. Chaffai, K. Al-haddad, V. Rajagopalan","doi":"10.1109/IAS.1990.152318","DOIUrl":"https://doi.org/10.1109/IAS.1990.152318","url":null,"abstract":"The design of a 5 kW utility-interactive high-performance series resonant inverter is described. The inverter operates in an inaudible frequency range (20 kHz-100 kHz) and in the quasi-resonant mode. The results of an analytical study of the inverter show that, in this mode of operation, the inverter output characteristics are of the current-source type independent of the output voltage of the AC utility. The inverter uses turn-on controllable COMFET switches in the soft commutation mode and does not require snubber circuits. This converter combines the advantages of working at high frequency (less weight, small reactive filters, and absence of low-frequency transformer) and of using resonant links that allow the use of zero-current turn-off switches. Some of the experimental and simulation results obtained on a 2.5 kW-capacity laboratory prototype are presented.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124001483","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}
Constrained neural nets are used to identify the location and magnitude of harmonic sources in power systems with nonlinear loads, in situations where sufficient direct measurement data are not available. This approach permits measurement of harmonics with relatively few permanent harmonic measuring instruments. A simulated power distribution system is used to show that neural nets can be trained to use available measurements to estimate harmonic sources. These estimates are constrained to conform to the available direct harmonic measurements, which improve their accuracy. It is shown that suspected harmonic sources can be identified and measured by a process of hypothesis testing.<>
{"title":"Constrained neural network based identification of harmonic sources","authors":"R. K. Hartana, G. Richards","doi":"10.1109/28.195908","DOIUrl":"https://doi.org/10.1109/28.195908","url":null,"abstract":"Constrained neural nets are used to identify the location and magnitude of harmonic sources in power systems with nonlinear loads, in situations where sufficient direct measurement data are not available. This approach permits measurement of harmonics with relatively few permanent harmonic measuring instruments. A simulated power distribution system is used to show that neural nets can be trained to use available measurements to estimate harmonic sources. These estimates are constrained to conform to the available direct harmonic measurements, which improve their accuracy. It is shown that suspected harmonic sources can be identified and measured by a process of hypothesis testing.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124002632","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 development of a prototype system of an integrated energy automation center for supervisory control and data acquisition (SCADA) and energy management of an entire area integrating power distribution network buildings and individual plants is summarized. The development of a distributed controller for a field interface, local system, central system, and communication protocol is discussed. The feasibility of using a personal computer with minimum interface to implement this central system at any convenient location is demonstrated. User-written procedures enable application programs to run under an equivalent multitasking environment from a single-tasking operating system (MS/DOS). Loss of load management enables the fast restoration of supply automatically and transformer loss optimization reduces distribution energy loss significantly.<>
{"title":"A prototype for an integrated energy automation system","authors":"C. Teo, C.H. Tan, O. Chutatape","doi":"10.1109/IAS.1990.152431","DOIUrl":"https://doi.org/10.1109/IAS.1990.152431","url":null,"abstract":"The development of a prototype system of an integrated energy automation center for supervisory control and data acquisition (SCADA) and energy management of an entire area integrating power distribution network buildings and individual plants is summarized. The development of a distributed controller for a field interface, local system, central system, and communication protocol is discussed. The feasibility of using a personal computer with minimum interface to implement this central system at any convenient location is demonstrated. User-written procedures enable application programs to run under an equivalent multitasking environment from a single-tasking operating system (MS/DOS). Loss of load management enables the fast restoration of supply automatically and transformer loss optimization reduces distribution energy loss significantly.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125883449","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}
Y. Dote, H. Kobayashi, J. Fujikawa, A. Syitno, M. Strefezza
A zeroing technique with an equivalent disturbance observer and a predictive controller were combined and applied to robust and fast speed control for induction motors to which flux vector control is applied. It was experimentally confirmed that the proposed control system is insensitive to system parameter variations, external load torque changes, and flux vector control failure and that it yields a quick time response. It is superior to a conventional PI controller and is easily designed. The use of the same technique for suppressing mechanical vibrations of mechanical loads coupled with an induction motor is also discussed.<>
{"title":"Disturbance observer-based robust and fast speed controller for induction motors","authors":"Y. Dote, H. Kobayashi, J. Fujikawa, A. Syitno, M. Strefezza","doi":"10.1109/IAS.1990.152255","DOIUrl":"https://doi.org/10.1109/IAS.1990.152255","url":null,"abstract":"A zeroing technique with an equivalent disturbance observer and a predictive controller were combined and applied to robust and fast speed control for induction motors to which flux vector control is applied. It was experimentally confirmed that the proposed control system is insensitive to system parameter variations, external load torque changes, and flux vector control failure and that it yields a quick time response. It is superior to a conventional PI controller and is easily designed. The use of the same technique for suppressing mechanical vibrations of mechanical loads coupled with an induction motor is also discussed.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129426149","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}
T. Nakanishi, T. Kobayashi, D. Kobayashi, I. Kasahara
The features and configuration techniques of a CIE integrated system consisting of a computer control system, instrumentation control system, and electric control system that is applied to process lines, such as pickling and galvanizing lines in the metal industry, are described. The CIE integrated system features an open systems orientation using manufacturing automation protocol-based local area networks one-source management of system information, operation of plant equipment and facilities with fewer people, unification and ease of engineering and maintenance and smaller installation space.<>
{"title":"CIE (computer, instrumentation, and electric control) integrated system for the metal industry","authors":"T. Nakanishi, T. Kobayashi, D. Kobayashi, I. Kasahara","doi":"10.1109/IAS.1990.152366","DOIUrl":"https://doi.org/10.1109/IAS.1990.152366","url":null,"abstract":"The features and configuration techniques of a CIE integrated system consisting of a computer control system, instrumentation control system, and electric control system that is applied to process lines, such as pickling and galvanizing lines in the metal industry, are described. The CIE integrated system features an open systems orientation using manufacturing automation protocol-based local area networks one-source management of system information, operation of plant equipment and facilities with fewer people, unification and ease of engineering and maintenance and smaller installation space.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"4 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128606111","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}
Steady-state performance characteristics of the stator field oriented control, air-gap field oriented control and rotor field oriented control induction motor drives are compared. Effects of the magnetizing flux saturation on the magnetizing inductance and conductor temperature on the rotor resistance are rigorously included in the performance equations. Key performance indices, such as relative flux level, torque, motor efficiency, and input power factor, are compared when the drive is operating under constant torque and constant speed control.<>
{"title":"Steady state performance evaluation of saturated field oriented induction motors","authors":"O. Ojo, M. Vipin","doi":"10.1109/IAS.1990.152164","DOIUrl":"https://doi.org/10.1109/IAS.1990.152164","url":null,"abstract":"Steady-state performance characteristics of the stator field oriented control, air-gap field oriented control and rotor field oriented control induction motor drives are compared. Effects of the magnetizing flux saturation on the magnetizing inductance and conductor temperature on the rotor resistance are rigorously included in the performance equations. Key performance indices, such as relative flux level, torque, motor efficiency, and input power factor, are compared when the drive is operating under constant torque and constant speed control.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130123716","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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