Method and system for ride-through of an adjustable speed drive for voltage sags and short-term power interruption
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.
Subject
318/479318/375
318/380
363/37
363/50
363/74
H02M 5/458
H02M 7/217
H02P 27/08
H02P 1/029
H02M 2001/0022
Collections
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.