This talk is partially based on the IEEE Proc.  paper, Nov 2005
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Assumptions underlying successful hierarchical control [1,2]
•Each control area schedules its own resources to meet forecast load and scheduled exchanges with neighbors;
•There exists a multi-control area power flow solution for the scheduled  net tie-line flows
•Sufficient voltage support;
•Slow deviations around forecast can be regulated by  each control area in a decentralized way (using AGC, for example);
•Primary controllers stabilize  fast dynamics locally.
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