Security constrained economic dispatch with participation factors based on worst case bus load variations

An efficient method is presented for finding the economic and steady-state secure base point generation levels to supply the present load. From the specified range of possible load variation anticipated for each bus during the interval before the next base point optimization, the generator participation factors are calculated to guarantee a secure supply to the worst case combination of bus load excursions. The base points are calculated using a linear but lossy system model coupled with an efficient gradient computation technique. The worst case bus load condition is found as an extension of the base point calculation.