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# 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 circle6 Human activity follows cycles rhombus4 systems supplying services will also experience usage cycles circle6 transportation, communication, and electric power systems rhombus4 electric power consumption follows a daily, weekly, and seasonal cycles circle6 high power usage during the day and evening hours square4 industrial and commercial operations and lighting loads circle6 lower usage on the weekends circle6 higher usage during the summer and winter square4 greater temperature extremes circle6 Load cycles create economic problems for power generation rhombus4 it is quite expensive to continuously run all generation, which is needed to meet the peak power demands
© 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 3 Load Demand Cycles circle6 Definition rhombus4 commitment means to turn-on a given generation unit circle6 have the prime mover operating the unit at synchronous speed circle6 synchronize and connect the unit to the network grid circle6 Economics rhombus4 savings are gained by decommitting some of the generation units when they are not need to meet the current load demand rhombus4 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 circle6 Example rhombus4 consider the cost for operating three generation units rhombus4 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 Gen 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 P 2 P 3 F 1 F 2 1658 0 586 0 586 F 3 5418 5389 5497 5471 5617 F total
© 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 5 Load Demand Cycles circle6 Example rhombus4 notes: circle6 the least expensive way to supply the generation is not with all three units running or with any combination involving two units circle6 the optimal commitment is to only run unit #1, the most economic unit square4 by only running the most economic unit, the load can be supplied by that unit operating closer to its best efficiency square4 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 6 Load Demand Cycles circle6 Daily load patterns rhombus4 consider the load demand with a simple peak-valley
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• Fall '09
• Jhon
• Florida State University, Electricity generation, Electric power transmission, Electric power, Electricity distribution, Power System Operation and Control

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