Method and system for ride-through of an adjustable speed drive

Details Method and system for ride-through of an adjustable speed drive Method and system for ride-through of an adjustable speed drive

1999-02-12

1999-12-21

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Electrical conditions in circuit other than controlled motor...

318375, 318380, 363 37, 363 50, 363 74, G05F 508, H02M 544

Patent

active

060053623

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.

REFERENCES:
patent: 4811190 (1989-03-01), Keir et al.
patent: 4814966 (1989-03-01), Ekstrand
patent: 5513088 (1996-04-01), Williamson
patent: 5754419 (1998-05-01), Ho
H. Mao, et al. "High Performance Three-Phase Power Factor Correction Circuits", IEEE, vol. 1, Nov. 1995, pp. 8-14.
A. van Zyl, et al. "Voltage Sag Ride-Through for Adjustable Speed Drives with Active Rectifiers", IEEE, vol. 1, Oct. 1997, pp. 486-492.
A.R. Prasad, et al., "An Active Power Factor Correction Technique for Three-Phase Diode Rectifiers", IEEE Transactions on Power Electronics, vol. 6, No. 1, Jan. 1991, pp. 83-92.

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