{"title":"Field oriented control development for brushless doubly-fed machines","authors":"D. Zhou, R. Spée","doi":"10.1109/IAS.1996.557036","DOIUrl":"https://doi.org/10.1109/IAS.1996.557036","url":null,"abstract":"The brushless doubly-fed machine (BDFM) is robust and economic for variable speed applications due to its structure and reduced converter size requirement. Although scalar controls are appropriate for low performance operation, novel control strategies are needed for improved dynamic response. A rotor flux oriented control method is formulated in this paper utilizing BDFM synchronous angle information. Experimental results on a proof-of-concept system show the method's effectiveness. The method is simple and its complexity is comparable to vector controllers for conventional induction machines.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117031022","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}
{"title":"Protective device coordination in an industrial power system with multiple sources","authors":"P. Sutherland","doi":"10.1109/IAS.1996.563894","DOIUrl":"https://doi.org/10.1109/IAS.1996.563894","url":null,"abstract":"Protective device coordination in an industrial power system with electric utility ties and multiple in-plant generators presents challenges which cannot be resolved by the use of conventional time-current curves. Relays in different locations will see greatly different currents during the same fault. This may be resolved by the use of the conventional per-unit time current curve. However, many computer aided time current curve programs do not support this technique. The coordination of time-overcurrent relays in this case can best be performed numerically using tables or spreadsheets. In addition spreadsheet techniques may be used for the setting of other relays, such as feeder protection relays. An example of the coordination of an industrial power system with multiple generators connected through a synchronizing bus, and which also has two utility ties is examined in order to illustrate these points.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131089496","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}
Derong Pan, S. Shinohara, H. Ikeda, H. Yoshida, M. Sumi
{"title":"Measurable-range extension of range-finding speedometer using self-mixing laser diode","authors":"Derong Pan, S. Shinohara, H. Ikeda, H. Yoshida, M. Sumi","doi":"10.1109/IAS.1996.559288","DOIUrl":"https://doi.org/10.1109/IAS.1996.559288","url":null,"abstract":"We propose a new range-finding speedometer in order to extend a measurable range. The speedometer employing a self-mixing laser diode (SM-LD) is FM-modulated with a trapezoidal pulse current superimposed on a DC current so as to increase the peak power under a condition of maintaining the mean power within a safety level. Owing to a laser diode with a higher peak output power of 20 mW, the measurable range by the new sensor is greatly extended from 10 cm through more than 200 cm. The measurement accuracy for range and for velocity of /spl plusmn/4 mm/s through /spl plusmn/30 mm/s was about 1%, and 2%, respectively. The new sensor can be applied to a robot visual sensor for sensing an approximate shape of parts or work placed near an assembler robot.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"70 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132433162","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}
{"title":"The effect of DC offset on instantaneous operating characteristics of low-voltage circuit breakers","authors":"F.X. Chapman, B. Hammonds","doi":"10.1109/IAS.1996.563889","DOIUrl":"https://doi.org/10.1109/IAS.1996.563889","url":null,"abstract":"This paper addresses the effect of asymmetrical currents on factory adjustments and field verification of low-voltage circuit breaker instantaneous trip units. Both MCCBs and power circuit breakers are pertinent. Factory adjustment of low-voltage circuit breakers, based on test results using asymmetrical current, may cause the circuit breaker instantaneous unit to perform improperly and result in inadequate protection and coordination of electrical system apparatus. Similarly, field testing conducted to verify proper performance of low-voltage circuit breakers, using asymmetrical current, may lead to the erroneous conclusion that the circuit breaker's instantaneous unit is out of specification. In addition to addressing the difficulties presented by this phenomenon, this paper also proposes an approach to identifying and overcoming these testing difficulties.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133197349","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}
{"title":"Multimodular multilevel converters with input/output linearity","authors":"B. Mwinyiwiwa, Z. Wolanski, Yiqiang Chen, B. Ooi","doi":"10.1109/IAS.1996.560202","DOIUrl":"https://doi.org/10.1109/IAS.1996.560202","url":null,"abstract":"Multilevel converters constitute the key technology of power electronics to reach the high power ratings required by controllers of flexible AC transmission systems (FACTS). This paper shows that the sinusoidal pulse width modulation (SPWM) technique, as applied to multilevel converters, inherently requires a high switching rate. The paper then presents a strategy based on multiple modules of multilevel converters which operate with the lowest possible switching loss (each GTO switches ON and OFF only once during the modulation period), while maintaining the high gain-bandwidth product of linear amplifiers to handle fast feedbacks, which FACTS controllers must be capable of, in order to carry out dynamic performance enhancement.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133315706","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}
{"title":"Sinusoidal current drive system of permanent magnet synchronous motor with low resolution position sensor","authors":"S. Morimoto, Masayulu Sanada, Y. Takeda","doi":"10.1109/IAS.1996.556990","DOIUrl":"https://doi.org/10.1109/IAS.1996.556990","url":null,"abstract":"The high performance drives of the sinusoidal back-EMF type permanent magnet synchronous motor can be achieved by the current vector control, where the sinusoidal currents flow according to the rotor position and the current phase is suitably controlled according to the operating condition. In such a high performance drive system, a high resolution position sensor is desired. In this paper, a sinusoidal current drive system with a low resolution position sensor is proposed. The high resolution position information is obtained by the position estimating circuit from the signal of a low resolution position sensor. The steady-state and transient characteristics are examined by several experiments, then it is confirmed that the sinusoidal current drive and the high performance current vector control can be achieved by the proposed drive system.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132194220","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}
{"title":"A model free fuzzy logic based rotor position sensorless switched reluctance motor drives","authors":"A. Cheok, N. Ertugrul","doi":"10.1109/IAS.1996.557000","DOIUrl":"https://doi.org/10.1109/IAS.1996.557000","url":null,"abstract":"Switched reluctance motor drives may be used in many commercial applications due to their simplicity and inexpensiveness. However, they require rotor position information in order to operate. In many systems, though, rotor position sensors are undesirable and have disadvantages. To overcome the disadvantages induced by position sensors, a number of sensorless methods for switched reluctance motors have been proposed by researchers. Nevertheless, these methods present limitations, such as restrictions on the motor operating conditions and ineffectiveness at high speeds and at standstill operation. In this paper, a fuzzy logic-based sensorless control algorithm is described and a description of the implemented hardware system is given. The scheme may be used under all motor operating conditions including standstill and startup. An important feature is that saturation effects and real time nonidealiarities are not ignored, but no mathematical model is required. The system also incorporates techniques to overcome measurement errors and inaccuracies.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124308104","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}
{"title":"Power supply design considerations for maintaining a minimum sustaining current in a vortex water wall high pressure argon arc lamp","authors":"W. Yan, F. Dawson","doi":"10.1109/IAS.1996.563882","DOIUrl":"https://doi.org/10.1109/IAS.1996.563882","url":null,"abstract":"Vortex water wall high-pressure argon arc lamps are used to generate intense light and are capable of operating at radiative efficiencies greater than 50%. These lamps are being considered for use in a pulsed DC mode of operation in the next generation of rapid thermal processing applications. The results of a series of experiments have shown that the breakdown to arc transition consists of a prethermionic electrode emission phase and a nonlocal thermodynamic equilibrium positive column phase. The large dynamic voltage and current range between the breakdown phase and the arc phase necessitates the use of the following power circuit topologies: a high voltage ignition circuit connected in series with an arc sustaining power source; and an arc sustaining current source consisting of a step down hysteresis current controlled DC/DC power converter cascaded with a constant off-time output voltage controlled step up DC/DC power converter. The current controlled power converter supplies the minimum arc sustaining current whereas the step-up power converter provides the minimum post ignition pre-arc positive column voltage. A switch placed across the high voltage supply is closed after ignition and allows a reduction of the current ratings of the high voltage circuit components. Finally experimental verification of the circuit operation and design guidelines are provided.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133977247","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}
{"title":"The performance of beta particles sensitivity controlled open air corona streamer counter in humid air","authors":"L. Fouad, S. El-Hazek","doi":"10.1109/IAS.1996.563856","DOIUrl":"https://doi.org/10.1109/IAS.1996.563856","url":null,"abstract":"The possibility of using beta particles sensitivity controlled open air corona streamer counter (point-grid-plane, with preamplification gap) as a radiogauge depends mainly on the identification of the factors that affect its response. For this purpose, a complete analysis of the performance characteristics of such a counter as influenced by atmospheric humidity is given. A theoretical model is suggested to calculate the counter operating voltage and the beta particles triggered corona streamer pulse characteristics at different values of air relative humidity. The dependence of the plateau curves of such a counter on the concentration of water vapour in air is explained. The effect of air relative humidity on the counter energy response is also studied. A compensation for the errors due to humidity effects is suggested. All theoretical findings are confirmed by experiments.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"42 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114029254","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}
{"title":"High-power-factor electronic ballast with self-excited series resonant inverter","authors":"C. Moo, C. Lee, Y. Chua","doi":"10.1109/IAS.1996.563870","DOIUrl":"https://doi.org/10.1109/IAS.1996.563870","url":null,"abstract":"This paper presents a simple configuration of a high power factor electronic ballast. The proposed approach makes an integration of two power processing stages, a boost power converter and a self-excited series resonant inverter. The self-excitation mechanism makes a merit of self-adjustment on the inverter duty-ratio resulting in an almost unity power factor at the input line. Experimental tests are carried out an the circuit designed for a 36-W compact fluorescent lamp.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122379762","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}