SHORT-TERM RESOURCE SCHEDULING WITH RAMP CONSTRAINTS

This paper describes a Lagrangian relaxation based method to solve the short-term resource scheduling (STRS) problem with ramp constraints. Instead of discretizing the generation levels, the ramp rate constrain ts are relaxed with the system demand constraints using Lagrange multi pliers. Three kinds of ramp constraints, startup, operating and shutdo wn ramp constraints are considered. The proposed method has been appli ed to solve the hydro-thermal generation scheduling problem at PG&E. A n example along with numerical results is also presented.