A coupled-circuit model is used to analyze the transient and dynamic performance of a linear induction motor (LI). The behavior of a LIM during acceleration and deceleration, under fault conditions, in response to a step frequency change when it is connected to an inverter supply and under slip-frequency control is studied. The LIM parameter changes and the consequent transient behavior brought on by changes in rail top-cap conductivity and dynamic changes of the air gap are also presented. The thrust, speed, and secondary sheet currents are evaluated under various transient conditions. Computer simulation results are compared to test measurements from operational LIMs.<>
{"title":"Transient and dynamic performance of a linear induction motor","authors":"C. Lu, T. Eastham, G. Dawson","doi":"10.1109/IAS.1993.298934","DOIUrl":"https://doi.org/10.1109/IAS.1993.298934","url":null,"abstract":"A coupled-circuit model is used to analyze the transient and dynamic performance of a linear induction motor (LI). The behavior of a LIM during acceleration and deceleration, under fault conditions, in response to a step frequency change when it is connected to an inverter supply and under slip-frequency control is studied. The LIM parameter changes and the consequent transient behavior brought on by changes in rail top-cap conductivity and dynamic changes of the air gap are also presented. The thrust, speed, and secondary sheet currents are evaluated under various transient conditions. Computer simulation results are compared to test measurements from operational LIMs.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114653497","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}
Recognizing the limitations of existing test equipment the Canadian Standards Association developed a computer-aided lamp temperature measuring apparatus. This equipment incorporates a simple approach to detecting thermal characteristics of tungsten filament lamps. The key element of this equipment is a data acquisition system that compiles measured test data and selects the maximum temperatures. The test data can be used to develop an empirical equation for determining the maximum temperatures of new tungsten filament lamps. This equation will compute maximum permissible profile temperature limits for new lamps with different bulb size or different lamp wattages.<>
{"title":"Computer-aided lamp temperature measuring apparatus and maximum lamp profile temperature","authors":"D. Li","doi":"10.1109/IAS.1993.299208","DOIUrl":"https://doi.org/10.1109/IAS.1993.299208","url":null,"abstract":"Recognizing the limitations of existing test equipment the Canadian Standards Association developed a computer-aided lamp temperature measuring apparatus. This equipment incorporates a simple approach to detecting thermal characteristics of tungsten filament lamps. The key element of this equipment is a data acquisition system that compiles measured test data and selects the maximum temperatures. The test data can be used to develop an empirical equation for determining the maximum temperatures of new tungsten filament lamps. This equation will compute maximum permissible profile temperature limits for new lamps with different bulb size or different lamp wattages.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114438200","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 performance and cost-effectiveness of compact fluorescent lighting systems were assessed for five building types. While several commonly used performance criteria were identified in advance, other performance attributes only became apparent during the study. Fixture and lamp costs are substantially higher than for incandescent systems, but are offset by much longer lamp life and greater efficacy. Comparative life-cycle cost estimates were developed. The balance between increased capital and decreased operating costs varies with electricity tariffs, labor costs for replacing burned-out lamps, and other factors. Compact fluorescents may be a desirable choice for other reasons such as reduced vulnerability to electricity price increases, reduced loads on emergency power systems, reduced temperatures in areas inadequately cooled by air conditioning systems, simplification of lamp inventories, reduced heat damage to exit sign enclosures, and prevention of inadvertent gross overlamping.<>
{"title":"Field performance of compact fluorescent systems","authors":"J. Love","doi":"10.1109/IAS.1993.299185","DOIUrl":"https://doi.org/10.1109/IAS.1993.299185","url":null,"abstract":"The performance and cost-effectiveness of compact fluorescent lighting systems were assessed for five building types. While several commonly used performance criteria were identified in advance, other performance attributes only became apparent during the study. Fixture and lamp costs are substantially higher than for incandescent systems, but are offset by much longer lamp life and greater efficacy. Comparative life-cycle cost estimates were developed. The balance between increased capital and decreased operating costs varies with electricity tariffs, labor costs for replacing burned-out lamps, and other factors. Compact fluorescents may be a desirable choice for other reasons such as reduced vulnerability to electricity price increases, reduced loads on emergency power systems, reduced temperatures in areas inadequately cooled by air conditioning systems, simplification of lamp inventories, reduced heat damage to exit sign enclosures, and prevention of inadvertent gross overlamping.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"48 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122589813","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}
Current and emerging technologies for lamps based on solid-state semiconductor materials are reviewed. Recent advances include high-performance light-emitting diodes (LEDs) (efficiencies of 15% and luminous intensities of 15 cd), practical blue, multicolor, and white light sources, superluminescent diodes with characteristics intermediate between LEDs and diode lasers, and novel light-emitted materials such as silicon and conductive polymers. The potential of this class of light source for specific niche applications is also reviewed.<>
{"title":"Advanced solid-state semiconductor light sources","authors":"S. B. Peralta, H. Ruda","doi":"10.1109/IAS.1993.299201","DOIUrl":"https://doi.org/10.1109/IAS.1993.299201","url":null,"abstract":"Current and emerging technologies for lamps based on solid-state semiconductor materials are reviewed. Recent advances include high-performance light-emitting diodes (LEDs) (efficiencies of 15% and luminous intensities of 15 cd), practical blue, multicolor, and white light sources, superluminescent diodes with characteristics intermediate between LEDs and diode lasers, and novel light-emitted materials such as silicon and conductive polymers. The potential of this class of light source for specific niche applications is also reviewed.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122871947","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 authors present a novel autotuning method based on fuzzy reasoning for the speed controller (proportional-integral or PI controller) in vector-controlled induction motor drives. The trajectory of the step response of motor speed described in the phase plane is used to examine the gain parameters of the PI controller. To obtain appropriate gain parameters, fuzzy inference is implemented offline at two characteristic points defined on this phase trajectory. Fuzzy control rules are devised on the basis of the principle that the gain parameters have appropriate values if these characteristic points exist at the origin in the phase plane. This method is applied to a model drive system with a 0.75 kW induction motor. Simulation results show that the validity of this autotuning method.<>
{"title":"Auto-tuning method based on fuzzy reasoning for speed controller in vector-controlled induction motor drives","authors":"I. Miki, T. Kumano, T. Yamada","doi":"10.1109/IAS.1993.298873","DOIUrl":"https://doi.org/10.1109/IAS.1993.298873","url":null,"abstract":"The authors present a novel autotuning method based on fuzzy reasoning for the speed controller (proportional-integral or PI controller) in vector-controlled induction motor drives. The trajectory of the step response of motor speed described in the phase plane is used to examine the gain parameters of the PI controller. To obtain appropriate gain parameters, fuzzy inference is implemented offline at two characteristic points defined on this phase trajectory. Fuzzy control rules are devised on the basis of the principle that the gain parameters have appropriate values if these characteristic points exist at the origin in the phase plane. This method is applied to a model drive system with a 0.75 kW induction motor. Simulation results show that the validity of this autotuning method.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124216168","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}
As an initial step toward establishing a comprehensive research program on building automization, a conceptual framework for a dynamic and integrative control of daylighting and electric lighting systems for commercial buildings is presented. The integrative control of architectural systems creates opportunities to reduce energy consumption in buildings. With the increased application of microprocessors to HVAC, electric lighting, and adjustable facade elements, occupants and climatic conditions can be used to advantage. For daylighting control, an integrative control approach is proposed that considers context variables, control logic, design variables, and control functions. From these, a framework was developed for the integrative control of architectural systems. An important part of the integrative control approach is the application of predictive control functions. In the case of daylighting control, this includes predictors for glare index and light level. By parsimoniously expressing these variables in terms of easily sensed climatic variables and window properties, an integrative solution can be achieved that considers energy efficiency and occupant well being.<>
{"title":"A conceptual framework for dynamic control of daylighting and electric lighting systems","authors":"J.-J. Kim, J. Jones","doi":"10.1109/IAS.1993.299210","DOIUrl":"https://doi.org/10.1109/IAS.1993.299210","url":null,"abstract":"As an initial step toward establishing a comprehensive research program on building automization, a conceptual framework for a dynamic and integrative control of daylighting and electric lighting systems for commercial buildings is presented. The integrative control of architectural systems creates opportunities to reduce energy consumption in buildings. With the increased application of microprocessors to HVAC, electric lighting, and adjustable facade elements, occupants and climatic conditions can be used to advantage. For daylighting control, an integrative control approach is proposed that considers context variables, control logic, design variables, and control functions. From these, a framework was developed for the integrative control of architectural systems. An important part of the integrative control approach is the application of predictive control functions. In the case of daylighting control, this includes predictors for glare index and light level. By parsimoniously expressing these variables in terms of easily sensed climatic variables and window properties, an integrative solution can be achieved that considers energy efficiency and occupant well being.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129642941","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 multilevel PWM (pulse-width-modulated) voltage source inverter, especially a five-level one, is introduced to obtain a static VAr compensator (SVC) as a large-scale power source. The three phase SVC is modeled using circuit DQ transformation and completely analyzed including DC and AC characteristics. Through experimental results for a 5 kVA SVC, the validity of the analyses and the feasibility of the VAr compensation system are shown for high-power applications.<>
{"title":"Modeling and analysis of a static VAR compensator using multilevel voltage source inverter","authors":"N. Choi, G. Cho, G. Cho","doi":"10.1109/IAS.1993.299006","DOIUrl":"https://doi.org/10.1109/IAS.1993.299006","url":null,"abstract":"A multilevel PWM (pulse-width-modulated) voltage source inverter, especially a five-level one, is introduced to obtain a static VAr compensator (SVC) as a large-scale power source. The three phase SVC is modeled using circuit DQ transformation and completely analyzed including DC and AC characteristics. Through experimental results for a 5 kVA SVC, the validity of the analyses and the feasibility of the VAr compensation system are shown for high-power applications.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124523256","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 author discusses a new application for a computer program called Lights, i.e., modeling the thermal characterization of fluorescent fixtures. This program is a powerful tool for the fixture designer because it handles the interaction between thermal heat transfer and lumen output of the fixture. The designer is able to evaluate changes in ballast location, lamp types, geometry of fixture, and material of construction. The program can run on a PC and the number of nodes can be selected depending on accuracy. The author shows the ease of using this computer program and outlines the effect of the number of lamps on the temperatures within the fixture as an example.<>
{"title":"Thermal characterization of fluorescent fixtures","authors":"E.V. Clancy","doi":"10.1109/IAS.1993.299202","DOIUrl":"https://doi.org/10.1109/IAS.1993.299202","url":null,"abstract":"The author discusses a new application for a computer program called Lights, i.e., modeling the thermal characterization of fluorescent fixtures. This program is a powerful tool for the fixture designer because it handles the interaction between thermal heat transfer and lumen output of the fixture. The designer is able to evaluate changes in ballast location, lamp types, geometry of fixture, and material of construction. The program can run on a PC and the number of nodes can be selected depending on accuracy. The author shows the ease of using this computer program and outlines the effect of the number of lamps on the temperatures within the fixture as an example.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128899184","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}
K. Matsui, I. Yamamoto, K. Tsuboi, K. Iwata, S. Muto, M. Watanabe, F. Ueda
A forward power converter with reduced harmonics for the input supply current is proposed. In this converter, the input capacitance is reduced, so that lower-order harmonics such as the fifth and the seventh can be largely reduced by about 20% to 40%. However, the DC link voltage ripple is increased in the proposed circuit. Such characteristics have been improved by a ripple compensation circuit consisting of the feedforward circuit. One can also obtain a noticeable harmonic elimination effect for the use of parallel connection between the proposed circuits and the conventional ones.<>
{"title":"A reduction method of harmonic currents in power systems generated by switching regulators","authors":"K. Matsui, I. Yamamoto, K. Tsuboi, K. Iwata, S. Muto, M. Watanabe, F. Ueda","doi":"10.1109/IAS.1993.299238","DOIUrl":"https://doi.org/10.1109/IAS.1993.299238","url":null,"abstract":"A forward power converter with reduced harmonics for the input supply current is proposed. In this converter, the input capacitance is reduced, so that lower-order harmonics such as the fifth and the seventh can be largely reduced by about 20% to 40%. However, the DC link voltage ripple is increased in the proposed circuit. Such characteristics have been improved by a ripple compensation circuit consisting of the feedforward circuit. One can also obtain a noticeable harmonic elimination effect for the use of parallel connection between the proposed circuits and the conventional ones.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126974109","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}
Hermann Ludeke, J. Maas, N. Frohleke, H. Grotstollen
The application of the describing function method to model resonant power converters leads to nonlinear high-order models which can be linearized under small perturbation assumptions to yield small-signal linear models. These high-order models are processed by an invariant order reduction technique to obtain approximated transfer functions of lower order, expressed analytically without AC simulation. The automatable technique is demonstrated for the series-parallel resonant converter. After discussing various controllers as to parameter variation in the operation area, a robust controller is selected, assuring high dynamics in the whole operation region.<>
{"title":"Controller design for resonant converters by automatable techniques","authors":"Hermann Ludeke, J. Maas, N. Frohleke, H. Grotstollen","doi":"10.1109/IAS.1993.299003","DOIUrl":"https://doi.org/10.1109/IAS.1993.299003","url":null,"abstract":"The application of the describing function method to model resonant power converters leads to nonlinear high-order models which can be linearized under small perturbation assumptions to yield small-signal linear models. These high-order models are processed by an invariant order reduction technique to obtain approximated transfer functions of lower order, expressed analytically without AC simulation. The automatable technique is demonstrated for the series-parallel resonant converter. After discussing various controllers as to parameter variation in the operation area, a robust controller is selected, assuring high dynamics in the whole operation region.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121786759","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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