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Electric power system supervisory control system comprising A/D converters at various points of the power system

  • US 3,972,470 A
  • Filed: 03/27/1975
  • Issued: 08/03/1976
  • Est. Priority Date: 09/07/1972
  • Status: Expired due to Term
First Claim
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1. A supervisory control system for supervising and controlling an electric power system by the use of digital signals representative of instantaneous analog data of first preselected points of the power system and inherently stationary data of second preselected points of the power system, said control system comprising:

  • first detecting devices coupled to said power system at said first preselected points for detecting said instantaneous analog data to produce instantaneous analog signals representative of said instantaneous analog data;

    second detecting devices coupled to said power system at said second preselected points for detecting said inherently stationary data to produce inherently stationary signals representative of said inherently stationary data;

    a master oscillator for producing timing pulses;

    synchronized encoders, each placed adjacent to at least one of said first detecting devices and electrically associated therewith and with said master oscillator, said synchronized encoders substantially simultaneously sampling in response to said timing pulses the instantaneous analog signals produced by the associated first detecting devices to produce instantaneous digital signals representative of the instantaneous analog data detected by the last-mentioned first detecting devices; and

    asynchronous encoders, each placed adjacent to at least one of said second detecting devices and electrically associated therewith, said asynchronous encoders sampling the inherently stationary signals produced by the associated second detecting devices to produce sampled inherently stationary signals representative of the inherently stationary data detected by the last-mentioned second detecting devices;

    said instantaneous digital signals and the sampled inherently stationary signals being used as the first-mentioned digital signals.

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