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System and method for automatically operating UPFC (unified power flow controller) connected to SCADA (supervisory control and data acquisition)

  • US 7,642,757 B2
  • Filed: 10/04/2006
  • Issued: 01/05/2010
  • Est. Priority Date: 04/25/2006
  • Status: Active Grant
First Claim
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1. A system connected to a SCADA (Supervisory Control and Data Acquisition) for automatically operating a UPFC (Unified Power Flow Controller), the system comprising:

  • a UPFC acting as a serial/parallel FACTS (Flexible AC Transmission System) to control variables of a system;

    a SCADA for periodically acquiring line data of the system and state data of the UPFC, the UPFC data including inverter'"'"'s driving state data; and

    an upper controller for analyzing data received from the SCADA, deciding system state data on the basis of received data, classifying the system state data into steady-state data, state data of a bus-voltage drop, state data of a line accident, determining control objective functions appropriate for individual state based on the result of a system state analysis using predetermined optimum objective functions and operation scenarios by analyzing off-line system'"'"'s information, analyzing the UPFC operation mode according to the determined control objective, performing an OPF execution for each objective, determining a flow in active/reactive power of the UPFC'"'"'S serial side and a voltage reference of the UPFC'"'"'s parallel side, using an OPF execution result and determining an optimum operation mode for each system condition and optimum operational references (set-point control commands).

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