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IEEE Industry Applications Magazine

Issue 1 • Jan.-Feb. 1998

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Displaying Results 1 - 9 of 9
  • A history of harmonics in power systems

    Publication Year: 1998, Page(s):6 - 12
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1744 KB)

    Waveforms of potential (voltage) and current in electric power systems are seldom the idealized functions on which engineering work is based. Harmonic analysis can be used to resolve complex time-based waveforms into spectral components. History teaches us that as new problems with harmonics arise, new instruments to measure the phenomenon will be offered and tighter limits on allowable deviations... View full abstract»

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  • Starting high inertia loads on adjustable speed drives

    Publication Year: 1998, Page(s):27 - 31
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (932 KB)

    When starting motors with high inertia loads across the line, it is common practice to determine load inertia and then make acceleration time calculations. Comparing acceleration time to the motor's maximum allowable time to accelerate, the motor can be used or, if necessary, the next larger rating may be required because the acceleration time with a particular inertia is too long. It is not uncom... View full abstract»

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  • PWM drive filter inductor influence on transient immunity

    Publication Year: 1998, Page(s):39 - 45
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The proliferation of power electronics has introduced several incompatibilities between electronic equipment and typical variations of utility electric power. One of the most common is disruption of operation of pulsewidth-modulated (PWM) adjustable speed drives due to the transient caused by closing utility capacitors. This article explores the impact on PWM drives of the utility capacitor switch... View full abstract»

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  • Variable speed drives evaluation test

    Publication Year: 1998, Page(s):53 - 57
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    We present a test protocol and results of tests on pulse width modulated (PWM) drives rated at 3 hp and 20 hp and supplied from a 480 V line. The induction motor was turning a 25 hp computer-controlled DC dynamometer. This dynamometer was powered from the same source through a stepdown transformer and a regenerative controlled rectifier. Data (speed, torque, input voltages, currents) were collecte... View full abstract»

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  • Available insulation systems for PWM inverter-fed motors

    Publication Year: 1998, Page(s):14 - 26
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5680 KB)

    This article focuses specifically on integral horsepower AC induction motors used in the pulp and paper industry. An analysis of the various winding stresses is presented. The different requirements for the two insulation systems are discussed (MG1-Parts 30 and 31 For General Purpose and Definite Purpose Inverter Fed Motors), and test results show the need for higher dielectric insulation when the... View full abstract»

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  • Circulating type motor bearing current in inverter drives

    Publication Year: 1998, Page(s):32 - 38
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    To facilitate understanding of the differences between the two types of inverter-induced bearing currents which appear in induction motor drives, a review of the previous noncirculating type of bearing current theory is given. A brief introduction to the concept of coupling current in drive systems follows. This article then proposes an explanation to the generation of a circulating-type of bearin... View full abstract»

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  • Output filters for PWM drives with induction motors

    Publication Year: 1998, Page(s):46 - 52
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    When an induction motor is energized from a pulse width modulated (PWM) inverter, through long connecting cables, its insulation system can be severely stressed. The high dv/dt voltage pulses at the output of the inverter cause traveling waves in the connecting cable between the inverter and the motor. When the traveling wave reaches the motor, a large impedance mismatch is present which leads to ... View full abstract»

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  • Improved voltage source inverter with 18-step output waveforms

    Publication Year: 1998, Page(s):58 - 65
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    In this article, an improved voltage source inverter is proposed. This circuit is based on the NPC (neutral point clamped) inverter. By dividing the input DC source into four sections and adding four auxiliary switching elements, the proposed circuit can be performed as if an 18-step inverter as far as the harmonic components in the AC output voltages are concerned. The performances of the propose... View full abstract»

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  • A four level rectifier inverter system for drive applications

    Publication Year: 1998, Page(s):66 - 74
    Cited by:  Papers (86)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    In a motor drive, the converters must be able to handle bidirectional real power flow. So far, DC voltage balancing has not been satisfactorily discussed for the case when real power is drawn from the inverter. This article addresses the control issues involved in a four-level inverter based AC drive application. The DC capacitor voltages are balanced for both motoring and regenerating modes of th... View full abstract»

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IEEE Industry Applications Magazine publishes articles concerning technical subjects and professional activities that are within the Scope of the IEEE Industry Applications Society (IAS) and are of interest to society members

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

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