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IEE Proceedings - Electric Power Applications

Issue 6 • Date Nov 1995

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Displaying Results 1 - 10 of 10
  • Transformer for multimegahertz power applications

    Publication Year: 1995, Page(s):379 - 389
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1468 KB)

    It is established that the eddy current losses in transformer windings at frequencies of 1 MHz or more, even when primary and secondary turns are interleaved in alternate layers, are unacceptably high. An improved winding arrangement is proposed in which primary and secondary turns are interleaved on the same winding layer. This almost eliminates leakage flux, to the extent that AC winding losses ... View full abstract»

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  • Transformerless four-wire PWM rectifier and its application in AC-DC-AC converters

    Publication Year: 1995, Page(s):410 - 416
    Cited by:  Papers (18)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (684 KB)

    The paper introduces a transformerless four-wire power-factor-corrected boost rectifier which does not draw low-order harmonic currents from the supply neutral. The four-wire rectifier topology and control is described. The main application of such a rectifier is a new transformerless, four-wire AC-DC-AC converter for uninterruptible power supplies. Simulation results show the steady-state and dyn... View full abstract»

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  • Contactless measurement of the secondary position in linear reluctance motors

    Publication Year: 1995, Page(s):355 - 360
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    A new method of measuring the position of the secondary in a linear reluctance motor (LRM) is described, based on sampled measurements of the primary phase currents and the airgap flux density at the primary surface. Corrections must be applied for primary slot openings, primary end effects, and currents induced in a conducting barrier between the primary and the secondary. A static positional acc... View full abstract»

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  • Relevance of step-lap joints for magnetic characteristics of transformer cores

    Publication Year: 1995, Page(s):371 - 378
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (700 KB)

    It has been stated that multistep-lap (MSL) jointed cores show distinct improvements regarding power losses P in comparison to single-step-lap (SSL). On the other hand, model core experiments tend to yield contradictory results. In the paper, special emphasis was put on the underlying physical mechanisms, taking into consideration that model cores usually show `perfect' stacking, while full-size c... View full abstract»

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  • Active reactive-power controller

    Publication Year: 1995, Page(s):405 - 409
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    A novel technique for building reactive power compensators using the switched-capacitor technique is presented. Normally when switched-capacitor are used for reactive power compensation they are operated at the supply frequency; in the proposed technique the capacitors are switched at higher frequencies, typically 800 Hz. The main advantages of this approach is that it provides a stepless variatio... View full abstract»

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  • Unified AC/DC power flow for system simulation in DC electrified transit railways

    Publication Year: 1995, Page(s):345 - 354
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (900 KB)

    The paper presents the improvements of a commercially available train simulator, the Energy Management Model (EMM), to evaluate the power flows in DC electrified transit railways. The sequential Gauss-Seidel power flow program used in EMM has been replaced by a unified Newton-Raphson AC/DC power flow to speed up the calculations. A precise model of the uncontrolled bridge rectifier with commutatio... View full abstract»

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  • PWM control method for a four-level inverter

    Publication Year: 1995, Page(s):390 - 396
    Cited by:  Papers (30)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (556 KB)

    Several PWM techniques for three-level inverters have been introduced. However, multilevel inverters with more voltage levels have not been considered yet. The paper proposes a PWM control method for four-level inverters. The four-level inverter uses six power switches per leg, but the blocking voltage of each switch is equal to one third of the DC-link voltage. The control method is based on clos... View full abstract»

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  • Index

    Publication Year: 1995
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    First Page of the Article
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  • Robust speed control of brushless direct-drive motor using integral variable structure control

    Publication Year: 1995, Page(s):361 - 370
    Cited by:  Papers (38)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (988 KB)

    A robust speed control technique for a brushless direct-drive motor (BLDDM) using a variable structure control (VSC) approach is presented. The significant problems of conventional VSC are investigated in view of the practical implementation and an integral variable structure control with a load torque observer is proposed as an effective way of overcoming these problems. By employing the proposed... View full abstract»

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  • Position control with fuzzy adaptation for induction servomotor drive

    Publication Year: 1995, Page(s):397 - 404
    Cited by:  Papers (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (584 KB)

    The paper presents a two-degree-of-freedom (2DOF) controller with a reference model following fuzzy adaptation for position control of an induction motor drive. First, an indirect field-oriented induction servomotor drive is implemented, and a 2DOF controller is designed at nominal case according to the given tracking and regulating drive specifications. Then the resulting closed-loop tracking tra... View full abstract»

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