ECE4762011_Lect5 - ECE 476 POWER SYSTEM ANALYSIS Lecture 5...

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Lecture 5 Power System Operation, Transmission Lines Professor Tom Overbye Department of Electrical and Computer Engineering ECE 476 POWER SYSTEM ANALYSIS
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2 Reading and Homework 1 st Exam moved to Oct 11 (in class) For lectures 4 through 6 please be reading Chapter 4 we will not be covering sections 4.7, 4.11, and 4.12 in detail though you should still at least skim those sections. HW 1 is 2.9, 22, 28, 32, 48; due Thursday 9/8 For Problem 2.32 you need to use the PowerWorld Software. You can download the software and cases at the below link; get version 15. http://www.powerworld.com/gloversarma.asp Direct PowerWorld download page is http://www.powerworld.com/DemoSoftware/GloverSarmaSimdwnl dv15.asp
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3 Substation Bus
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4 Power Transactions Power transactions are contracts between areas to do power transactions. Contracts can be for any amount of time at any price for any amount of power. Scheduled power transactions are implemented by modifying the area ACE: ACE = P actual,tie-flow - P sched
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5 100 MW Transaction Bus 2 Bus 1 Bus 3 Home Area Scheduled Transactions 225 MW 113 MVR 150 MW 291 MW 8 MVR 138 MVR 113 MW 56 MVR 1.00 PU 8 MW -2 MVR -8 MW 2 MVR -84 MW 27 MVR 85 MW -23 MVR 93 MW -25 MVR -92 MW 30 MVR 1.00 PU 1.00 PU 0 MW 32 MVR 100 MW AGC ON AVR ON AGC ON AVR ON 100.0 MW Scheduled 100 MW Transaction from Left to Right Net tie-line flow is now 100 MW
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6 Security Constrained ED Transmission constraints often limit system economics. Such limits required a constrained dispatch in order to maintain system security. In three bus case the generation at bus 3 must be constrained to avoid overloading the line from bus 2 to bus 3.
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7 Security Constrained Dispatch Bus 2 Bus 1 Bus 3 Home Area Scheduled Transactions 357 MW 179 MVR 194 MW 448 MW 19 MVR 232 MVR 179 MW 89 MVR 1.00 PU -22 MW 4 MVR 22 MW -4 MVR -142 MW 49 MVR 145 MW -37 MVR 124 MW -33 MVR -122 MW 41 MVR 1.00 PU 1.00 PU 0 MW 37 MVR 100% 100% 100 MW OFF AGC AVR ON AGC ON AVR ON 100.0 MW Dispatch is no longer optimal due to need to keep line from bus 2 to bus 3 from overloading
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8 Multi-Area Operation If Areas have direct interconnections, then they may directly transact up to the capacity of their tie-lines. Actual power flows through the entire network according to the impedance of the transmission lines. Flow through other areas is known as “parallel path” or “loop flows.”
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9 Seven Bus Case: One-line Top Area Cost Left Area Cost Right Area Cost 1 2 3 4 5 6 7 106 MW 168 MW 200 MW 201 MW 110 MW 40 MVR 80 MW 30 MVR 130 MW 40 MVR 40 MW 20 MVR 1.00 PU 1.01 PU 1.04 PU 1.04 PU
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ECE4762011_Lect5 - ECE 476 POWER SYSTEM ANALYSIS Lecture 5...

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