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Closed loop power factor control for drilling rigs

  • US 4,482,857 A
  • Filed: 08/08/1983
  • Issued: 11/13/1984
  • Est. Priority Date: 08/08/1983
  • Status: Expired due to Fees
First Claim
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1. In a drilling rig wherein one or more engine-generator sets form an alternating current power supply system for operating the rig'"'"'s electrical equipment and machinery, a method of controlling the system power factor comprising:

  • sensing the instantaneous system power factor;

    comparing the sensed instantaneous power factor to a prescribed power factor;

    forming a power factor control signal indicative of the difference between the sensed power factor and the prescribed power factor;

    providing a field excitation signal to an unloaded, over-excited generator operated in the motor mode in proportion to said power factor control signal to cause the over-excited generator to generate the requisite reactive power to correct the rig'"'"'s power factor to the prescribed power factor; and

    coupling the output of the over-excited generator to the rig power system.

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