lecture6 - EEL 6266 Power System Operation and Control...

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EEL 6266 Power System Operation and Control Chapter 5 Unit Commitment
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© 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 2 Load Demand Cycles c Human activity follows cycles r systems supplying services will also experience usage cycles c transportation, communication, and electric power systems r electric power consumption follows a daily, weekly, and seasonal cycles c high power usage during the day and evening hours s industrial and commercial operations and lighting loads c lower usage on the weekends c higher usage during the summer and winter s greater temperature extremes c Load cycles create economic problems for power generation r it is quite expensive to continuously run all generation, which is needed to meet the peak power demands
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© 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 3 Load Demand Cycles c Definition r commitment means to turn-on a given generation unit c have the prime mover operating the unit at synchronous speed c synchronize and connect the unit to the network grid c Economics r savings are gained by decommitting some of the generation units when they are not need to meet the current load demand r the engineering problem is committing enough units to meet current and future load demands while minimizing starting and operating costs
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© 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 4 Load Demand Cycles c Example r consider the cost for operating three generation units r what combination of units is best to supply a 550 MW load? Unit 1: F 1 ( P 1 ) = 561 + 7.92 P 1 + 0.001562 P 1 2 150 P 1 600 Unit 2: F 2 ( P 2 ) = 310 + 7.85 P 2 + 0.00194 P 2 2 100 P 2 400 Unit 3: F 3 ( P 3 ) = 93.6 + 9.56 P 3 + 0.005784 P 3 2 50 P 3 200 Unit 1 Unit 2 Off Off Unit 3 Off Off Off On Off On Off Off On On On Off Off On Off On On On Off On On On Max Gen 0 200 400 600 600 800 1000 1200 Min 0 50 100 150 150 200 250 300 P 1 Infeasible 0 550 500 295 267 400 0 0 255 233 150 0 50 0 50 0 5389 4911 3030 2787 3760 0 0 2440 2244 Infeasible Infeasible 2 3 F 1658 0 586 0 586 5418 5389 5497 5471 5617 total
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© 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 5 Load Demand Cycles c Example r notes: c the least expensive way to supply the generation is not with all three units running or with any combination involving two units c the optimal commitment is to only run unit #1, the most economic unit s by only running the most economic unit, the load can be supplied by that unit operating closer to its best efficiency s if another unit is committed, both unit #1 and the other unit will be loaded further from their best efficiency points, resulting in a higher net cost
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© 2002, 2004 Florida State University EEL 6266 Power System Operation and Control
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lecture6 - EEL 6266 Power System Operation and Control...

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