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0.5

0.25

0

-0.25

-0.5

-0.75

-1

-1.25

-1.5
0 2 4 6 8 10 12 14 16 18 20

Figure 4. State responses of case 2.

3

2

1
2 4 6 8 10 12 14 16 18 20

Figure 5. The switching behavior of active nodes of case 2.

5. CONCLUSIONS
This paper has designed ∞ output feedback decentralized load frequency controllers for multi-area power
systems under the shared but band-limited network. TOD and RR protocols have been used to improve com-
municationefficiency. Since transmissionpriority hasbeen well designed under schedulingprotocols, a higher
control performance has been obtained. Then, decentralized output feedback controllers with the prescribed