As large-scale system models, these models reflect the characteristics of the real systems more closely than the 10-machine system models; they have been developed based on the reduction of the real systems. However, as mentioned above, since the power flow conditions are modified, the stability conditions of the systems are more severe than those of the real systems.

Features

(1) This large scale system model has the 500 kV loops and the 275 kV loops. (30 machines, 107 nodes, 191 branch)

(2) Daytime : all the generators are operated at rated output power
(Total = 93,880 MVA (73,540 MW), Load = 72,600 MW)
Nighttime : 60% of the daytime condition
(Total = 93,880 MVA (50,120 MW, -9,270 MW (pumped)), Load = 40,180MW)

(3) Frequency : 50 Hz

Table 4.1 Outline of the IEEJ East 30-machine System Model
Table 4.2 Generator Constants
Table 4.3 Generator Data
Table 4.4 Calculation Results by Y-method
(Simulation results based on the Y-method in Fig.4.4 – Fig.4.6 and Fig.4.7.)

Fig.4.1 IEEJ EAST 30-machine System Model (Node No., Branch No., Disturbance Point)
Fig.4.2 IEEJ EAST 30-machine System Model (Impedance Map)
Fig.4.3(a) IEEJ EAST 30-machine System Model (Load Flow Map : Daytime Condition)
Fig.4.3(b) IEEJ EAST 30-machine System Model (Load Flow Map : Nighttime Condition)