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Power System Stabilizer

Power systems can be simulated fairly accurately on personal computers with appropriate software. Such simulations can predict large area-wide power outages caused by resonant swinging power flow in agreement with actual historical outages. Similarly the same computer mathematical equations have been programmed into the Power System Stabilizer subroutines of the modern voltage regulator.

Power System Stabilizers (PSS) can modulate the Synchronous machine's voltage to instantaneously take real power from the system or put real power into the system by varying the angle between magnetic moment or the rotating field and the rotating magnetic field of the three phase electric system reflected in the voltage on the stationary part of the Synchronous machine. If the adjustments of the PSS are set correctly, then power swings into or out of the Synchronous machine will act to dampen the system-wide resonant power swings and improve system stability. If the adjustments are set incorrectly, then the opposite is true.

Power System Stabilizers are being used on generators from 35MW and on groups of machines totaling 75MW in facilities that are connected to the transmission system.

E2 Power Systems has the tools, techniques and engineering expertise to correctly measure the system resonant frequencies, generator frequency response and set these programmable constants. E2 Power Systems provides PSS installation, commissioning and modeling studies. Services include:

  • PSS Settings Analysis for the PSS including settings based on on-site testing, computer modeling and development of the mathematical simulation modeling
  • Interface engineering required to connnect the PSS to the VOltage Regulator and Generator
  • Installation of the PSS (IEEE Type 2A PSS)
  • On-Site Tune-up and Commissioning involving Generator Dynamic Testing
    • Off-Line & On-Line Generator Repsonse Testing
    • Frequency Response Testing
    • Underexcitation Limit Stability Test
    • Overexcitation Limit Stability Test
  • Final Documentation including a model of the Generator, Excitation System and PSS for submission to the applicable regional NERC council. This documentation meets the NERC dynamic modeling data requirements as outlined in the NERC planning standards.

Learn more about our NERC Compliance Testing Services

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