A NETWORK FLOW MODEL FOR SHORT-TERM HYDRO-DOMINATED HYDROTHERMAL SCHEDULING PROBLEMS

This paper is concerned with the Short-Term Hydrothermal Scheduling (S THS) of hydro-dominated power systems. The problem's formulation inclu des the representation of operational constraints such as the hydrauli c coupling between hydro plants in cascade and the transmission limits in the electric network. In order to allow the problem's decompositio n into hydraulic and electric subproblems, a linear-quadratic penalty approach is applied to enforce the coupling between hydro and electric variables. As a result, the problem's natural network flow structure is fully exploited through special-purposed network flow algorithms. T he technique has been implemented in FORTRAN in a SUN SPARCstation IPX and tested in a 440 KV subsystem of the main interconnected Brazilian power system.