Anticipatory load shedding scheme for loadability enhancement

The paper presents a new anticipatory load shedding protection scheme implemented centrally from the energy control centre for loadability enhancement. Most of the schemes available in literature for this purpose are based on information at the current operating condition which are blind to load increase scenario and associated switchings in voltage controlled buses. The proposed scheme anticipates the danger of voltage instability in a time frame of interest by incorporating these effects. If the normal controls are exhausted, the algorithm based on successive application of LP restricts/ sheds required amount of low priority loads in advance so that the system survives voltage instability threat even during worst system period. Results for IEEE 30 bus and an Indian 91 bus power systems have been obtained to demonstrate the effectiveness of the proposed algorithm.