Inverter control for support of power factor corrected loads

Details Inverter control for support of power factor corrected loads Inverter control for support of power factor corrected loads

1996-09-20

1998-07-21

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 41, 307 46, 307 66, 361111, 361 92, 361 93, H02H 7122

Patent

active

057842680

ABSTRACT:
A method for controlling an inverter to improve the ability of the inverter to support power factor corrected (PFC) loads under transient conditions is provided. Changes in the load being provided power by an inverter may cause the RMS output voltage level of the inverter to drop. A PFC load may respond to such drops in the applied voltage level by increasing its current demand. This may cause the inverter current limit to be reached, forcing the inverter to be turned off, and causing the load to be dropped. This problem is avoided by responding to such load changes by immediately increasing the RMS output voltage level of the inverter to a level sufficient to minimize the voltage drop and prevent excessive current demands from the PFC load. The output voltage level of the inverter is then gradually reduced from the high voltage level to prevent the occurrence of oscillations due to interactions between the PFC load and the inverter controller. The present invention may be applied to backup power systems employing square wave inverters. In response to load changes, or transitions between line power and inverter operation following the detection of a line power fault, the inverter pulse width is immediately increased to an approximately maximum pulse width. The pulse width is then gradually reduced in increments to the pulse width required to maintain a constant regulated output RMS voltage level on the inverter under steady state conditions.

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