Wireless selective tripping of AC power systems connected in par

Details Wireless selective tripping of AC power systems connected in par Wireless selective tripping of AC power systems connected in par

1996-06-25

1998-04-28

Hecker, Stuart N.

Electric power conversion systems

Current conversion

Having plural converters for single conversion

323272, H02M 700, G05F 140

Patent

active

057453551

ABSTRACT:
A parallel redundant power supply system which does not use any inter-unit signaling is obtained by deriving all information necessary for a robust selective trip regime from the output signals of each respective power system. Each respective power system monitors its own power output and keeps a running average of its own performance to determine whether it is operating properly, rather than comparing itself to other units. The trip function is created by sampling the AC output voltage of the power system and multiplying an instantaneous difference in voltage (compared with a previous cycle) with the instantaneous difference in current (also compared with a previous cycle) of the power system's AC output power. If the two transients are in opposite directions, then the multiplicative product will be negative and indicative of a good power system. On the other hand, if the two transients are in the same direction, then the multiplicative product will be positive and indicative of a failed unit. The power system is removed from the power circuit when the multiplicative product is positive and greater than a predetermined trip value. The same technique may be used for self-monitoring of a single power supply connected to a load.

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