申論題

4. (15%) The incremental costs of units in $/MWh for three thermal plants are given  by
 IC₁ = 0.008P₁ +8.0
 IC₂ = 0.004P₂+6.0
 IC₃ = 0.005P₃ + 7.5
where P₁, P₂, and P₃ are in MW. The total load is 1200 MW with the following generator limits.
122 ＜P₁＜400
 80 ＜P₂ ＜550
250 ＜P₃ ＜600

(b) The real power loss with generation expressed in per unit on a 100-MVA base is given by P_L(pu)= 0.02P_1(pu) +0.05P_2(pu)+0.01P_3(pu),determinethe power loss in the transmission lines. (6%)