Page 147 - Mathematical Models and Algorithms for Power System Optimization

138 Chapter 5

5.5.1.4 Results of 5-bus system for three states
The results of LCO are identical to that of state 1 of the 5-bus system, which are solved by a
software package for the linear programming calculation.

(1) LCO results for state 1. One of the two circuit lines between bus 1 and bus 3 exits
operation. The LCO results for state 1 are shown in Table 5.13.
Table 5.13 Result of LCO for State 1
Result of load curtailment optimization
N-1 state power
Current power flow
Bus Type flow distribution Curtailment (MW)
distribution (MW)
(MW)
1 Load 120 120 0
2 Load 60 60 0
3 Load 150 150 0
4 Output 100 100 0
5 Balance 230 230 0
Result of line and transformer load rate in load curtailment optimization
Carrying current
Bus Bus Safety current (A) Load rate (%)
(A)
3 1 515 350 68
3 2 610 70 12
2 1 515 280 54
Main transformer
Bus Bus Power (MW) Load rate (%)
capacity (MVA)
5 3 300 230 77
4 2 150 100 67
(2) LCO results for state 2: the one-circuit line between bus 1 and bus 3, and the line between
bus 2 and bus 3 exit operation. The result of LCO for state 2 is shown in Table 5.14; the
diagram of status 2 and 3 of 5-bus test system is shown in Fig. 5.3.

State 3 State 2

Fig. 5.3
5-Bus test system for state 2 and 3.