lecture16- Interchange of power and energy

lecture16- Interchange of power and energy - EEL 6266 Power...

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Unformatted text preview: EEL 6266 Power System Operation and Control Chapter 10 Interchange of Power and Energy 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 2 Economy Interchange c Having interconnections between various electric power utility systems is beneficial r increases reliability c protects against unserved load due to loss of generation s reduces the cost of installing additional generation r more flexible operation c system frequency is more stable due to the increase in rotational inertia from the summation of all generating units s take advantage of sharing spinning reserve responsibilities r lower operating cost c take advantage of lower cost generation c utilities with excess energy can sell production to utilities with high load demands 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 3 Economy Interchange c Improving operating economics r opportunities may arise whenever two power systems are operating with different incremental costs r if a sufficient difference in cost exists, then it pays to have both systems exchange power at an equitable price c consider utility A is generating at a lower incremental cost than utility B c utility B buys the next megawatt for its load from utility A instead of generating it s this saves money in supplying the incremental load c utility A benefits economically from the sell of power to utility B as long as utility B is willing to pay a price that is greater than the cost of production of that block of power by utility A 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 4 Inter-utility Economy Evaluation c Example r consider two utilities connected with tie-lines Utility Unit Generating Unit Generator Limits Load Area Num. Cost Function P min (MW) P max (MW) Demand 1 1122 + 15.84 P 1 + 0.003124 P 1 2 150 600 A 2 620 + 15.70 P 2 + 0.003880 P 2 2 100 400 700 3 156 + 15.94 P 3 + 0.009640 P 3 2 50 200 subtotals: 300 1200 4 950 + 13.41 P 4 + 0.002641 P 4 2 140 590 B 5 560.5 + 14.17 P 5 + 0.003496 P 5 2 110 440 1100 6 560.5 + 14.17 P 6 + 0.003496 P 6 2 110 440 subtotals: 360 1470 1 2 3 4 5 6 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 5 Inter-utility Economy Evaluation c Example r first, examine the behaviors when each utility performs an economic dispatch on its own area without regards to the neighboring area r results of individual economic dispatches for each area c area A: P 1 = 322.7 MW F 1 = 6,559.07 = 17.856 P 2 = 277.9 MW F 2 = 5,282.50 P 3 = 99.4 MW F 3 = 1,835.68 F A = 13,677.25 c area B: P 4 = 524.7 MW F 4 = 8,715.00 = 16.185 P 5 = 287.7 MW F 5 = 4,927.13 P 6 = 287.7 MW F 6 = 4,927.13 F B = 18,569.26 c total operating cost = 32,246.50 2002, 2004 Florida State University...
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lecture16- Interchange of power and energy - EEL 6266 Power...

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