Electrical Power Systems

444 Electrical Power Systems
If the total demand P D = 150 MW, Determine
(a) the division of load between the units for the most economic operation (b) savings from economic
allocation of load between the units in comparison with their sharing the output equally.
Ans: (a) P g1 = 59 MW, P g2 = 91 MW; (b) Rs 247032
16.3 Incremental fuel costs in Rs/MWhr for two generating units of a plant are:
IC 1 = 10 + 0.05 P g1
IC 2 = 8 + 0.06 P g2
and the generating limits are as follows:
30 < Pg1 < 150 MW
30 < Pg2 < 150 MW
Assume both the units are operating at all times. How the load will be shared between the units
as the system load varies over the full range of the load values? What are the corresponding values
of l.
16.4 A sample power system is shown in ig. 16.15. Determine the loss coefficients.
ig. 16.15: Sample power system of P16.4.
Ans: B 11 =
( R1 + R3)
( R2 + R3)
; B
2 2
22 =
2 2
V cos f1
V cos f
1
2
2
; B 12 =
V V
1 2
R3
cosf cosf
1 2
16.5 A sample power system is shown in ig.16.16. Data for the system are given below. Determine the
loss coefficients on a 100 MVA base.
ig. 16.16: Sample power system of P16.5.