Mr. Piekutowski et al., OPTIMAL SHORT-TERM SCHEDULING FOR A LARGE-SCALE CASCADED HYDRO SYSTEM, IEEE transactions on power systems, 9(2), 1994, pp. 805-811
This paper describes a short term hydro generation optimization progra
m that has been developed by the Hydro Electric Commission (HEC) to de
termine optimal generation schedules and to investigate export and imp
ort capabilities of the Tasmanian system under a proposed DC interconn
ection with mainland Australia. The optimal hydro scheduling problem i
s formulated as a large scale linear programming algorithm and is solv
ed using a commercially-available linear programming package. The sele
cted objective function requires minimization of the value of energy u
sed by turbines and spilled during the study period. Alternative formu
lations of the objective function are also discussed. The system model
incorporates the following elements: hydro station (turbine efficienc
y, turbine flow limits, penstock head losses, tailrace elevation and g
enerator losses), hydro system (reservoirs and hydro network: active v
olume, spillway flow, flow between reservoirs and travel time), and ot
her models including thermal plant and DC link. A valuable by-product
of the linear programming solution is system and unit incremental cost
s which may be used for interchange scheduling and short-term generati
on dispatch.