Patent ID: 7642757
Filing Date: 2010-01-05
Classification: H02J,Y02E,Y04S

Abstract:
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).