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Terrorism and the Electric Power Delivery System (2012) / Chapter Skim
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Appendix G: Controlling Power Systems
Pages 137-141

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From page 137...
... Improving the control of voltage and reactive power may also require relatively low-cost high-voltage equipment additions Techniques for Shedding Load and Generation to Enhance such as shunt capacitor banks. Power System Dynamic Response Capabilities Automatic controls constitute one or more layers of the Power system dynamic response following disturbances defense in depth or multiple layers of defense principle for can, to some degree, be separated between real (active)
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From page 138...
... Reliability for the mission-critical actions at power plants, include automatic voltage regulators and must be at least as high as primary protective relaying, requirprime mover controls such as speed governors. Automatic ing as a minimum redundancy so that no single component voltage regulators include functions such as power system failure will cause overall control system failure.
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From page 139...
... Two types of these controls are continuous feedback control, Sophisticated Control Algorithms and discontinuous control, which take actions similar to Sophisticated control algorithms use various techniques those taken by SPSs. Compared to local controls, wide-area such as adaptive or "intelligent" control as part of digital controls provide greater observability and controllability.
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From page 140...
... Clair Avon Lake FIGURE G.2 August 14, 2003, voltage profile from west to east across northern Ohio. SOURCE: U.S.­Canada Power System Outage Task Force (2004)
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From page 141...
... Again, the correspond- controlled separations of the northern and southern portions ing high reactive power output combined with old excita- of the western interconnection into two electrical islands tion equipment caused the initial Eastlake 5 outage. The is initiated.
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Key Terms

  • voltage profile
  • automatic controls
  • load shedding
  • power electronic
  • outage task

  • electronic devices
  • power plant
  • voltage regulators
  • power delivery
  • power practice

  • special protection
  • feedback control
  • dynamic response
  • emergency controls
  • sophisticated control

  • transmission network
  • automatic voltage
  • power reserves
  • multiple outages
  • desired voltage

  • protective relaying
  • electric reliability
  • generator tripping
  • discontinuous feedback
  • shunt capacitor

  • undervoltage load
  • mover controls
  • underfrequency load
  • trip signals
  • voltage control


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