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# ExamB_2008 - Name ECE 476 Exam#2 Thursday 75 Minutes Closed...

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Name: ________________________ ECE 476 Exam #2 Thursday, November 13, 2008 75 Minutes Closed book, closed notes One new note sheet allowed, one old note sheet allowed 1. ________ / 25 2. ________ / 25 3. ________ / 25 4. ________ / 25 Total ________ / 100

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1. (25 points total) A generator bus ( with a 1.05 per unit voltage) supplies a voltage dependent load through a lossless transmission line with per unit (100 MVA base) impedance of j0.1 and no line charging. The per unit voltage dependent loads are P L = 2.0 + 1.0 V L Q L = 1.0 + 1.0 V L where V L is the load bus voltage magnitude. Starting with an initial voltage guess of 1.05 0 ° , determine the first iteration value of the load bus voltage (magnitude and angle) using the Newton-Raphson power flow method.
2. (25 points total) The fuel-cost curves for a two generator system are given as follows: C 1 (P G 1 ) = 1500 + 50 * P G 1 + 0.05 * (P G 1 ) 2 C 2 (P G 2 ) = 100-+ 60 * P G 2 + 0.01 * (P G 2 ) 2 Generator limits are:

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ExamB_2008 - Name ECE 476 Exam#2 Thursday 75 Minutes Closed...

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