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Load management and control apparatus

  • US 5,798,634 A
  • Filed: 04/25/1997
  • Issued: 08/25/1998
  • Est. Priority Date: 09/30/1994
  • Status: Expired due to Fees
First Claim
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1. A load management and control apparatus installed in a receiving end substation, comprising:

  • a transformer having a tap changer and being connected between a load bus and a source of power;

    a voltage adjusting unit for adjusting a tap of the transformer;

    a reactive power supply unit connected to said load bus; and

    a control unit for controlling connection or disconnection of said reactive power supply unit from said load bus and for changing said tap of said transformer, and includingmeans for detecting active power and reactive power in addition to a detection of system voltage,means for varying the system voltage and a power flow state by the connection or disconnection of the reactive power supply unit,means for estimating system reactance by using the resultant variations in the voltage and the reactive power, andmeans for carrying out control operation by using the estimated system reactance and establishing a relationship between the tap changing operation of the transformer and the connection or disconnection operation of the reactive power supply unit for setting the voltage and power factor of the system receiving side within desired ranges.

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