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Industry Applications Magazine, IEEE

Issue 2 • Date Mar/Apr 1995

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Displaying Results 1 - 6 of 6
  • High-frequency high-power static induction transistor

    Publication Year: 1995 , Page(s): 40 - 45
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    This article demonstrates the characteristics, physical construction, and application for a newly commercialized high-frequency static induction transistor (SIT). The main features of this device are a lowering in the gate-to-source and gate-to-drain capacitances and an increase in the breakdown voltage and power rating. These enhancements were brought about as a result of the introduction of new and refined manufacturing technologies. The new high-frequency SIT device is being applied in applications such as medium wavelength radio transmitters and induction heaters View full abstract»

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  • Simplified predetermination of line current harmonics

    Publication Year: 1995 , Page(s): 17 - 27
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (564 KB)  

    In predetermining line current harmonics of controlled AC/DC converters, the effects of commutation and DC ripple must be taken into account frequently, as for example in the case of medium-size DC drive applications. Based on a suitable normalization, the dominant parameters determining the current harmonics are the line and DC side reactances, respectively, and the DC voltage. This forms the basis for a systematic comparison of the accuracy of analytical formulas, describing the commutation or the DC ripple effect only. By the aid of these results, the validity ranges of different approximation formulas can be estimated and the most important question answered concerning the proof of the conventional assumption of a “sufficiently” smoothed DC current. In order to predetermine line current harmonics as easily as possible, the most effective formula can be obtained out of corresponding decision areas. Thereby, the allowable error is restricted to 2% of the fundamental, confirmed by comparing results of digital simulation studies View full abstract»

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  • Current injection method to eliminate harmonics

    Publication Year: 1995 , Page(s): 28 - 33
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    This article proposes a method to eliminate AC harmonic currents by injecting equal-but-opposite harmonic compensating currents. This method is applicable to any type of load considered a harmonic source. This article describes a system involving a hardware interface, a PC, and advanced software to measure, analyze, and report the condition of harmonics on the power system. This system is used to generate all the necessary harmonic currents for compensation. Digital simulation and experimental results from a single and three phase AC/DC converters are shown to verify the effectiveness of this technique View full abstract»

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  • Aspects of power electronics evolution in Europe

    Publication Year: 1995 , Page(s): 8 - 16
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    This article describes the state of the art and the main evolutionary trends in Europe in the fields of power semiconductor devices and technology, industrial drives and power conditioning, traction drives, and space and military applications. Similarly high is the number of universities and RandD centers active in power electronics, which are also active in various cooperation programs under patronage of the European Union. This article focuses on main topics only, the perspective being that of the members of the IEEE-IAS-IPCC European Working Group (EWG), which was established in 1990 as the European subcommittee of the Industrial Power Converter Committee. The areas covered in the article are power semiconductor technology, and applications regarding traction and automotive, space and avionics, industrial drives, UPS systems, and induction heating. The state of the art and main evolutionary trends are discussed View full abstract»

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  • Expert system for analysis of electric power system harmonics

    Publication Year: 1995 , Page(s): 34 - 39
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (340 KB)  

    The proliferation of power electronics devices that cause harmonic voltages and currents and the widespread use of harmonics-sensitive electronic equipment are creating a near-epidemic of “power quality” issues that are being addressed by both users and suppliers of electric energy. Numerous types, styles, and capabilities exist in the field of instrumentation and diagnostic equipment for the detection, recording, and analysis of the distorted waveform. This article reports on one effort to employ artificial intelligence (Al) in the form of a Harmonics Analysis Expert System (HAES). The resulting PC-based software program has captured the knowledge of expert power system engineers in a “rule base” which can be applied to information about the topology, power signature, operating practices, symptoms, equipment, type and ratings, and chronology of system development to diagnose the power system for harmonics-caused problems. The goal is to accomplish the analysis with a less experienced engineer, thereby multiplying the available nationwide pool of expertise. Additionally, repeated use of the system does result in impartation of knowledge from the system to the user. The process of applying this AI approach involves: (1) training the user, (2) measurements (optional), (3) diagnosis, and (4) solution of the power system for harmonics disturbances to acceptable power quality. The emphasis of this paper is on the diagnostic module (Al program) with a usage example presented View full abstract»

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  • Burndown prevention in static power converter equipment

    Publication Year: 1995 , Page(s): 46 - 53
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    Burndown of static power converter equipment is, fortunately, a rare event. When it does occur it is devastating. Danger to personnel and long-term loss of production are the result. Designers and users of the equipment are, understandably, not inclined to publicize their misfortunes. As a result, few technical papers are written on the subject. Over the years the authors have investigated some burndowns, and heard rumors of others. One author has been present, on more than one occasion, when arcing faults have occurred, fortunately without either burndown or physical injury to personnel. These experiences have provided much information concerning are initiation, burndowns, and their causes. Although the experience on which this article is based relates to low-voltage (<1000 volts), high power (>l MW), phase-controlled converters, the conclusions and recommendations are applicable to all types of low-voltage converters View full abstract»

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Aims & Scope

IEEE Industry Applications Magazine reports on the development and application of electrical systems, apparatus, devices, and controls to the processes and equipment of industry and commerce; the promotion of safe, reliable, and economic installations; the encouragement of energy conservation; and the creation of voluntary engineering standards and recommended practices.

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Editor-in-Chief
H. Landis "Lanny" Floyd
 

eic-iam@ieee.org