×

Systems and methods for under-frequency blackout protection

  • US 9,008,850 B2
  • Filed: 08/01/2011
  • Issued: 04/14/2015
  • Est. Priority Date: 08/24/2010
  • Status: Active Grant
First Claim
Patent Images

1. A system for managing an electric power delivery system, comprising:

  • a plurality of intelligent electronic devices (IEDs), each IED of the plurality of IEDs being communicatively coupled with a load, wherein each IED of the plurality of IEDs is configured to obtain system information related to an operating frequency of the load to which it is communicatively coupled and power consumption of the load to which it is communicatively coupled, and wherein each IED of the plurality of IEDs is configured to selectively disconnect the load to which it is communicatively coupled from the electric power delivery system; and

    a central IED communicatively coupled with the plurality of IEDs, the central IED being configured to receive the system information from the plurality of IEDs, the system information related to operating frequencies of the loads;

    based on the operating frequencies of the loads, calculate decay rates of the operating frequencies;

    when an operating frequency of a load has reached a predetermined under-frequency level, determine which loads are associated with a same sub-grid of a plurality of sub-grids of the electric power delivery system, wherein loads with similar decay rates change in operating frequency during a similar time period are determined to be associated with the same sub-grid;

    calculate an amount of load to shed;

    calculate which loads to shed based on;

    a calculated amount of load to shed;

    the received power consumption information of the loads; and

    ,whether the loads to shed are associated with the same sub-grid;

    signal the IEDs associated with the calculated loads to shed to disconnect the associated loads from the electric power delivery system;

    wherein the decay rates comprise times at which operating frequencies reach a predetermined under-frequency level.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×