A power station comprises two synchronous generators with 200 MW and 400 MW putput power capacity. The two generators operate in parallel and are connected to the grid network. Both generators have governor droop characteristics of 3% (no-load to full-load percentage speed drop). Assume a free governor action. a) If the supply frequency, determined by the grid, is 1.005 pu., calculate the total power supplied by the power station. b) The 400 MW machine is more efficient than the 200 MW machine. For the same total power as determined in part (a), calculate the percentage adjustment in the no-load speed to be made by the speeder motor on the two machines if the 400 MW machine is to operate at its full capacity while the 200 MW machine supplies the difference. Assume that the frequency of the grid supply to remain as in part (a).

A power station comprises two synchronous generators with 200 MW and 400 MW putput power capacity. The two generators operate in parallel and are connected to the grid network. Both generators have governor droop characteristics of 3% (no-load to full-load percentage speed drop). Assume a free governor action. a) If the supply frequency, determined by the grid, is 1.005 pu., calculate the total power supplied by the power station. b) The 400 MW machine is more efficient than the 200 MW machine. For the same total power as determined in part (a), calculate the percentage adjustment in the no-load speed to be made by the speeder motor on the two machines if the 400 MW machine is to operate at its full capacity while the 200 MW machine supplies the difference. Assume that the frequency of the grid supply to remain as in part (a).

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.5P

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