10-10-2012, 05:30 PM
EE533 Power Operations Cost Based Unit Commitment
EE533 Power Operations Cost Based Unit Commitment.ppt (Size: 455 KB / Downloads: 56)
The Unit Commitment Problem
Tradeoffs
A unit that is on line may be expensive and running at minimum capacity
Shutting the unit down may save money
BUT
Will incur startup cost when needed again
May not be possible to start by the time it is needed
The Unit Commitment ProblemPriority Lists
Full load average cost = Full load Cost ($/H) / Capacity MW
This ordering is the Priority List
Commit enough units in priority order to meet peak load+reserve
In each hour see if a unit can be shut down ( reverse priority)
Total capacity > Hourly load+reserve
Dynamic Programming-Solution
Which state is part of the optimal solution?
AT this point we don’t know
What we do know is that
If state 5 were part of the optimal trajectory at stage 1 then it would originate in state 5 with a total cost of 0 out to stage 1!!!!