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Transients in Power Systems

by: Fredy Okuneva

Transients in Power Systems ECE 524

Fredy Okuneva
GPA 3.81


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Class Notes
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This 13 page Class Notes was uploaded by Fredy Okuneva on Thursday October 22, 2015. The Class Notes belongs to ECE 524 at University of Idaho taught by Staff in Fall. Since its upload, it has received 7 views. For similar materials see /class/227736/ece-524-university-of-idaho in ELECTRICAL AND COMPUTER ENGINEERING at University of Idaho.

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Date Created: 10/22/15
171 quotCu NOISSES SIAELLSAS tElMOd NI SiNEJISNV dJ 1725 ED o m 3 552 2 E w 2 b 3 ECE 524 Transients in Power Systems Session 13 Page 1419 Spring 2008 Eliminate the source resistance again Suppose the bank 2 is energized through a resistor with bank 1 already in the system Determine the resistance needed to limit the peak line to ground voltage on either bank to 335kV C1C2 I C 1433 F eq C1 C2 eq H Simulation Results With R 2501 ohm switching at t 156lms Results identical with L1 ignored 40 103 30 20 20 4 3o 0 file Exampl1Rpl4 xvart t VMAX 81 v202 0 40 50 10 s 60 9 Analytical Solution m C1 4011 uF c2 2229 uF N S Vm 2817 kV Actual value With C1 in the system Undamped resonant frequencies E 1 l f I f 43935 01 mm 01 s 9w 24 osmniobmmhmzpi i ECE 524 Session 13 Page 1519 Transients in Power Systems Spring 2008 1 f 2 02 CYCZ 2 L W 1 C1C2 Driving voltage for fm Likely to be damped severly by a resistance that can damp the lower frequency so neglect this resonant circuit From charge balance C1 VC1O C1 C2 Voo Assume near voltage peak When switch C1 in nity Vm m memity 1811kV V Vdrivingpoint 3 Vm quot Vinfinity Vdrivingpoint 1006 kV Damped resonant voltage will be oct Vim quot quotVdrivingpoint39e Sm mdt l Ci Cz 2R C1 C2 Where ct Dd 2397T39fOl2 X2 Find maximum voltage that can be added to source VmaXAdded I Vm VmaXAdded So we want the positive peak of the damped sine wave to be C 5 0ct VmaXAdded Vdrivingpoim39e 39SlnDdt ECE 524 Transients in Power Systems Session 13 Page 1919 Spring 2008 1 Recall OL 2RC1 C2 1 Jigz 239OL39C1 C2 m2 27tf012 a2 This still doesn39t quite match the simulation results R 2248 0 03d 1 43567 21t S T j ozmulok MEwZCD a 053103ng E ocmnlob azcn i U 30 3 m Uni39versi tyofIdah0 osmvtcb umzphz a ocmviob mzp 2


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