Distributed load interruption and shedding against voltage delayed recovery or instability

Abstract

Abstract-This paper deals with a two-part system integrity protection scheme to be installed in distribution networks, to counteract fault-induced delayed voltage recovery or even shortterm voltage instability due to induction motors. The first part consists of a fast triggered but temporary reduction of some loads to facilitate motor re-acceleration after fault clearing. The second part resorts to load shedding, as a back-up. The scheme relies on purely distributed controllers; each of them measures a bus voltage and interrupts/disconnects load at the same bus. Tests have been performed on a generic MV/LV system. They illustrate the benefit of load interruption and the selectivity of the proposed scheme.Index Terms--Fault-induced delayed voltage recovery, shortterm voltage instability, system integrity protection schemes, load shedding, load interruption.

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