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IEE Proceedings - Electric Power Applications

Issue 5 • Date Sep 1994

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Displaying Results 1 - 7 of 7
  • Highly stable power supply using digitally controlled phase-controlled rectifier and active filter

    Publication Year: 1994, Page(s):221 - 228
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    A design of a highly stable current-controlled power supply combining a phase controlled rectifier (PCR), passive filter and active filter is investigated. A digital phase-locked voltage control (PLVC) with a capability of compensating the thyristor firing angles under an unbalanced power source is proposed; otherwise the PCR output voltage has low-order subharmonics whose suppression requires a b... View full abstract»

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  • Negative-phase-sequence reduction with adjacent static reactive-power compensators

    Publication Year: 1994, Page(s):259 - 263
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    Static reactive power (VAr) compensators (SVCs) can be used to reduce negative phase sequence (NPS) voltages by balancing, for example, phase-to-phase-connected loads. In such cases, they are effective until their controlled elements, usually thyristor-controlled reactors, reach their operating limits. Once this happens, NPS currents flow in the system and produce NPS voltages. If several load bal... View full abstract»

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  • Optimal-current control of convertor-fed DC motors. II. General case

    Publication Year: 1994, Page(s):249 - 258
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (616 KB)

    For pt. I see ibid., vol.141, no.5, p. 240-8. (1994). In this paper a new method of firing control for a three-phase thyristor bridge supplying a DC motor in both monitoring and regenerating modes is described. The method uses the firing points as the sampling instants and the `cusp current' at these instances as the controlled variable. For continuous-current operation, the method enables the cur... View full abstract»

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  • Damper windings in synchronous machines fed by a current-source inverter

    Publication Year: 1994, Page(s):229 - 234
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    The mathematical model of an inverter-fed synchronous machine which permits detailed analysis of the behaviour of the damper winding is described. The effects of the damper winding on the steady-state characteristics of the inverter-fed synchronous-machine, especially on the torque ripple and commutation behaviour, are examined. It is shown that the damper winding has relatively little effect on t... View full abstract»

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  • Static VAr compensator with fully controlled reactors

    Publication Year: 1994, Page(s):264 - 268
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB)

    A novel configuration for a static VAr compensator (of fundamental harmonic reactive power) is proposed. The compensator operates by controlling coupled reactors through force-commutated switches. The compensator is compared with traditional systems and its specific advantages, including cost factors, are discussed View full abstract»

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  • Losses in PWM inverters using IGBTs

    Publication Year: 1994, Page(s):235 - 239
    Cited by:  Papers (69)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB)

    The aim of this paper is to calculate the forward and switching losses of a PWM inverter employing IGBTs using a relatively simple method from manufacturers' catalogue parameters, that is, finding a reasonable compromise between accuracy and complexity. The system will be able to calculate losses for different modulation methods, provided the current output is sinusoidal. Part of the results can b... View full abstract»

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  • Optimal-current control of convertor-fed DC motors. I. Special case for continuous current with negligible resistance

    Publication Year: 1994, Page(s):240 - 248
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    The paper describes a new method of firing control for a three-phase thyristor bridge supplying a DC motor in both motoring and regenerating modes. The method uses the firing points as the sampling instants and the `cusp current' at these instances as the controlled variable. For continuous-current operation, the method enables the current to be changed from one steady-state level to another in tw... View full abstract»

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