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SYSTEM FOR CONTROLLING THE FREQUENCY OF AN ALTERNATING CURRENT CONVERTER IN RESPONSE TO LOAD CHANGES

  • US 3,829,757 A
  • Filed: 01/31/1973
  • Issued: 08/13/1974
  • Est. Priority Date: 07/18/1970
  • Status: Expired due to Term
First Claim
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1. A system for producing alternating current of a controlled frequency, said system coMprising:

  • a converter connected to a source of power and comprising a generator synchronized by a synchronizing signal to generate the alternating current at said frequency;

    a load for said generator;

    accumulating means to receive a pilot signal and to produce said synchronizing signal in response to accumulation of said pilot signal to a limiting value;

    control means to control said accumulating means to determine the length of time between successive ones of said synchronizing signals;

    generating means controlled by said load to generate a second synchronizing signal for said generator at least during intervals of failure of power from said source; and

    means connecting said accumulating means to said control means to adjust the limiting value of said accumulating means during power failure, whereby said accumulating means will accumulate said pilot signal to the new limiting value and upon restoration of power hereby will synchronize the frequency of the alternating current from said generator to a value commensurate with the adjusted limiting value.

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