Historical overview of frequency measurement

Power system frequency measurement has been in use since the advent of alternating current generators and systems. The speed of rotation of generator rotors is directly related to the frequency of the voltages they generate. The Watt -type fly-ball governor of steam turbines (Figure 4.1) is essentially a frequency measuring device which is used in a feedback control system to keep the machine speed within a limited range around the nominal value. However, this measurement is available only at the generating stations, and there is need for measuring frequency of power system at network buses away from the generating stations.


Phase Angle Frequency Measurement Steam Turbine Frequency Estimation Data Window 
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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • A.G. Phadke
    • 1
  • J.S. Thorp
    • 1
  1. 1.Virginia Polytechnic Institute and State UniversityBlacksburgUSA

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