Problem 2 A Small Isolated Power System Is Supplied From A Power Plant With A Steam Turbine Driven Generator And Two Gas 1 (46.35 KiB) Viewed 36 times
Problem 2 A Small Isolated Power System Is Supplied From A Power Plant With A Steam Turbine Driven Generator And Two Gas 2 (16.29 KiB) Viewed 36 times
Problem 2 A small isolated power system is supplied from a power plant with a steam turbine driven generator and two gas turbine driven generators. The generators nameplate ratings are: Generator 1: 800,000 kVA, 1800 RPM, 220 kV, 0.90 power factor lagging, wye-connected stator windings. Generator 2: 102,800 kVA, 3600 RPM, 13.8 kV, 0.85 power factor lagging, wye-connected stator windings Generator 3: 58,200 KVA, 3600 RPM, 13.2 kV, 0.85 power factor lagging, and wye-connected stator windings The large steam unit is operated as a base-load unit which means that is supplying full load output The other two units are operated as regulating units with a 80% loading dispatch. The steady state speed droop constant R is 5% for all three units on generator nameplate MVA rating. The load governing characteristic D for this system is 1.0 per unit. The system operating system frequency is 60 Hz. 1. What is the system frequency change, fin Hz, caused by a load increase of 58 MW when all transients have died out? Ignore supplementary control action.
2. What is the system frequency change, fin Hz, caused by a sudden load loss of 200 MW when all transients have died out? Ignore supplementary control action.
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