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    Method and system for ride-through of an adjustable speed drive for voltage sags and short-term power interruption

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    6005362.pdf (553.9Kb)
    Date
    1999-12-21
    Author
    Enjeti, Prasad N.
    Duran-Gomez, Jose L.
    Metadata
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    Abstract
    In one embodiment of the present invention, a system for ride-through of an adjustable speed drive for voltage sags is provided. The system comprises an adjustable speed drive including a three phase electric utility, a diode rectifier, a dc-link, an inverter, and a motor. Coupled to the adjustable speed drive is a ride-through circuit which includes a controller having a first input and a second input, the first input operable to receive the voltage from each phase of the three phase electric utility and determine the magnitude and phase of the voltage sag, and the second input operable to receive the dc-link voltage to ensure that the rated dc-link voltage is not exceeded. Also included is an IGBT coupled to an output of the controller and operable to switch on and off rapidly based on the amount of voltage sag. An inductor associated with the IGBT and operable to store energy when the IGBT is switched on and to transfer energy to the dc-link when the IGBT is off is also included. This maintains the dc-link voltage to provide ride-through operation of the adjustable speed drive.
    URI
    https://hdl.handle.net/1969.1/176628
    Subject
    318/479
    318/375
    318/380
    363/37
    363/50
    363/74
    H02M 5/458
    H02M 7/217
    H02P 27/08
    H02P 1/029
    H02M 2001/0022
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    • Texas A&M University Patents
    Citation
    Enjeti, Prasad N.; Duran-Gomez, Jose L. (1999). Method and system for ride-through of an adjustable speed drive for voltage sags and short-term power interruption. United States. Patent and Trademark Office; Texas A&M University. Libraries. Available electronically from https : / /hdl .handle .net /1969 .1 /176628.

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