Answered: A generating station forq a power…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A generating station forq a power system consists of five 189-MVA 15-kV 0.85-PF-lagging synchronous generators with identical speed droop characteristics operating in parallel. The governors on the generators’ prime movers are adjusted to produce a 2.5-Hz drop from no load to full load. four of these generators are each supplying a steady 139 MW at a frequency of 60 Hz, while the fifth generator (called the swing generator) handles all incremental load changes on the system while maintaining the system's frequency at 60 Hz. 1)At a given instant, the total system loads are 500 MW at a frequency of 60 Hz. Compute the no-load frequencies of each of the system’s generators? 2)If the system load rises to 600 MW and the generator’s governor set points do not change, compute the new system frequency be? 3)To what frequency must the no-load frequency of the swing generator be adjusted in order to restore the system frequency to 60 Hz? 4)If the system is operating at the conditions described in part (c), what would happen if the swing generator were tripped off the line (disconnected from the power line)?

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