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ECE4762011_Lect15 - ECE 476 POWER SYSTEM ANALYSIS Lecture...

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Lecture 15 Power Flow, Economic Dispatch Professor Tom Overbye Department of Electrical and Computer Engineering ECE 476 POWER SYSTEM ANALYSIS
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2 Announcements Be reading Chapter 12.4 and 12.5 for lectures 15 and 16 HW 6 is 6.50, 6.52, 6.59, 12.20, 12.26; due October 20 in class.
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3 In the News: Line Costs Increase On Tuesday Ameren gave new costs for the proposed 138 kV line between the Bondville and Southwest Campus substations Cost for the “preferred” 9.8 mile route has increased from $14 million in 2010 to $23.8 million currently Also require $6 million in substation costs Increased material and real-estate costs were the reason for the change Source: News-Gazette, October 12, 2012
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4 Wind Turbine and Power Flow There are four main types of wind turbines: Type 1: Induction machine; treated as PQ bus with negative P load Type 2: Induction machine with varying rotor resistance; treated as Type 1 Type 3: Doubly Fed Induction Generator (DFIG); treated as a PV bus Type 4: Full Asynchronous Generator; treated as a PV bus
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5 Wind Farm (Park) Feeder Layout Usually a number of wind turbines are located together, in what is known as a wind farm or wind park. Typical turbine size is 1 to 3 MW onshore, 3 to 6 MW off-shore A common voltage level is 600V, with the voltage stepped up to 34.5 kV in the distribution system connecting to a single transmission system interconnection point.
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6 Indirect Transmission Line Control What we would like to determine is how a change in generation at bus k affects the power flow on a line from bus i to bus j. The assumption is that the change in generation is absorbed by the slack bus
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7 Power Flow Simulation - Before One way to determine the impact of a generator change is to compare a before/after power flow. For example below is a three bus case with an overload Z  fo r a ll lin e s =  j 0 .1 O n e T w o  2 0 0  M W  1 0 0  M V R 2 0 0 .0  M W  7 1 .0  M V R T h r e e 1 . 0 0 0  p u    0   M W   6 4  M V R  1 3 1 . 9  M W   6 8 . 1  M W   6 8 . 1  M W 1 2 4 %
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8 Power Flow Simulation - After Z  fo r a ll line s =  j 0 .1 Lim it  for a ll lin es =  1 5 0  M V A O n e T w o  2 0 0  M W  1 0 0  M V R 1 0 5 .0  M W  6 4 .3  M V R T h r e e 1 .0 0 0  p u
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