EEC 420 Power System Analysis Exam 2023

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EEC 420: A 2-page Second Semester RESIT Examination for Power System Analysis (EEC420), University of Buea College of Technology, instructors T. A. Mih / A.C. Tange, 14/07/2023, 2 hours. Section A: Q1 (20pts) computes sending-end voltage, current, power and power factor of a long 60-Hz three-phase transmission line (R=63.5 ohm, X=167 ohm/phase, B=1.1mS) carrying 50MW at 208kV, 0.8pf lagging, using the short-line approximation, nominal-pi method and exact (long) line equations, with a comparison comment. Q2 (15pts) covers the per-unit system definition, base-quantity requirements, and a worked impedance/reactance diagram (generator as base) for a generator-transformer-line-transformer-motor radial system. Section B: Q3a (10pts) performs one Newton-Raphson iteration on a given pair of nonlinear equations; Q3b (15pts) performs one Gauss-Seidel iteration for bus-2 voltage and the line current in a simple 2-bus power system; Q3c (10pts) derives the Newton-Raphson Jacobian matrix for a 2-bus power-flow system.