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IEE Proceedings - Electric Power Applications

Issue 2 • Mar 1997

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Displaying Results 1 - 11 of 11
  • Generalised theory of the brushless doubly-fed machine. I. Analysis

    Publication Year: 1997, Page(s):111 - 122
    Cited by:  Papers (91)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1248 KB)

    The authors develop the concept of the brushless doubly-fed machine (BDFM), from consideration of the frequency and distribution of the EMFs induced in bars of a conventional doubly wound cage motor. These considerations lead to the development of a rigorous mathematical model which is suitable for the analysis of BDFM operating in the synchronous mode. Expressions for all impedances and electrica... View full abstract»

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  • General method of magnetising flux saturation modelling in d-q axis models of double-cage induction machines

    Publication Year: 1997, Page(s):101 - 109
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (996 KB)

    Two models of induction machines with two rotor windings, that include magnetising flux saturation, are available at present: the first one is the current state-space model, where state-space variables are selected as d-q axis components of stator and both rotor currents; while in the second model state-space variables are d-q axis components of stator and both rotor flux linkages. The paper prese... View full abstract»

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  • LQ control of sinusoidal current PWM rectifiers

    Publication Year: 1997, Page(s):95 - 100
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    A new design method based on linear quadratic control theory is developed for the design of PWM rectifiers with sinusoidal input current. PWM rectifiers are promising because they can supply DC power while keeping a sinusoidal current with unity in the fundamental power factor. There are two types, a voltage-fed rectifier and a current-fed rectifier. The former is required to simultaneously contro... View full abstract»

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  • High performance control of the series-parallel resonant converter

    Publication Year: 1997, Page(s):131 - 139
    Cited by:  Papers (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (956 KB)

    The authors describe the operation, characteristics and design of a two-loop control technique for a MHz-switching series-parallel resonant power converter. A resonant current feedback loop is used to determine the transistor switching instants resulting in the fourth-order power converter characteristics becoming third order and, furthermore, being insensitive to operating conditions. The techniq... View full abstract»

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  • Field evaluation for electromagnetic torque components

    Publication Year: 1997, Page(s):85 - 94
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (788 KB)

    The paper deals with the problem of evaluating torque components that act in electromechanical devices (especially in synchronous machines). Components that act upon both the coils and the ferromagnetic core of machine rotors are evaluated. The given relationships are proved. The components which act upon the currents and ferromagnetics of synchronous machine rotors are calculated View full abstract»

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  • Generalised theory of the brushless doubly-fed machine. 2. Model verification and performance

    Publication Year: 1997, Page(s):123 - 129
    Cited by:  Papers (34)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (796 KB)

    The paper compares the performance predictions made using a new model of the brushless doubly-fed machine with measurements made on a laboratory test machine. The agreement between measurement and prediction is shown to be very good. The synchronous behaviour of the machine is shown to be very similar to that of a DC-excited synchronous machine, with the shaft torque determining the input power an... View full abstract»

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  • Time-domain modelling of power transformers using modal analysis

    Publication Year: 1997, Page(s):77 - 84
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (704 KB)

    The paper describes how a new form of transformer model, based on modal transformer analysis, may be converted from the frequency domain into the time domain for EMTP implementation. Given results confirm that the resulting time-domain model is able to accurately account for the frequency-dependent effects of practical transformers. The novelty of the model is that it is centred on natural modes o... View full abstract»

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  • Losses in PWM converters using IGBTs: on the effect of bus-clamping on the distortion of the AC-side currents

    Publication Year: 1997, Page(s):169 - 171
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    The authors refer to the paper 'Losses in PWM inverters using IGBTs' by F. Casanellas (see ibid., vol.141, no.5, p.235-9, 1994) and the various correspondence that followed its publication. As an extension to the authors' previous correspondence (see ibid., vol.142, no.1, p.285-7, 1995), the authors compare the RMS values of the phase current harmonics (and/or the harmonic losses) resulting for ha... View full abstract»

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  • Optimal traffic control at railway junctions

    Publication Year: 1997, Page(s):140 - 148
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (992 KB)

    Conflict occurs when two or more trains approach the same junction within a specified time. Such conflicts result in delays. Current practices to assign the right of way at junctions achieve orderly and safe passage of the trains, but do not attempt to reduce the delays. A traffic controller developed in the paper assigns right of way to impose minimum total weighted delay on the trains. The traff... View full abstract»

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  • Analysis and simulation of a high-speed two-phase AC drive for aerospace applications

    Publication Year: 1997, Page(s):149 - 157
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (860 KB)

    The majority of aerospace high-speed AC drives are high energy density electric motors that employ small diameter and long axial length. These motors are supplied from a three-phase, 400 Hz aircraft supply. Their construction is either a two-pole or a four-pole design using a three-phase stator winding. The paper suggests an alternative drive based on a novel form of two-phase inverter-fed inducti... View full abstract»

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  • Analytical solution to harmonic characteristics of traction PWM converters

    Publication Year: 1997, Page(s):158 - 168
    Cited by:  Papers (25)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (856 KB)

    The paper presents an analytical technique for calculating the AC input current harmonic spectrum of single-phase PWM converter drives used in railway traction. The technique is based on a 3-D modulation model and the double Fourier series (DFS) method. Formulas in the form of Bessel functions representing the harmonic spectra for several combinations of interlaced PWM converters are derived. Thes... View full abstract»

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