SYSTEM AND METHOD FOR AUTOMATICALLY OPERATING UPFC (UNIFIED POWER FLOW CONTROLLER) CONNECTED TO SCADA (SUPERVISORY CONTROL AND DATA ACQUISITION)

• US 20070250217A1
• Filed: 10/04/2006
• Published: 10/25/2007
• Est. Priority Date: 04/25/2006
• Status: Active Grant

• Current Assignee: Korea Electric Power Corporation (Government of South Korea)
• Original Assignee: Korea Electric Power Corporation (Government of South Korea)
• Inventors: CHOO, Jin-Boo, JEON, Young-Soo, MOON, Seung-Pil, YOON, Jong-Su, CHANG, Byung-Hoon, CHOI, Young-Cheul, KIM, Soo-Yeol, LEE, Won-Kyo, KIM, Chang-Gon
• Granted Patent: US 7,642,757 B2
• Time in Patent Office: Days
• US Class Current: 700/286
• CPC Class Codes: H02J 13/00001 characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 3/1814 wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y02E 40/10 Flexible AC transmission systems [FACTS]
• CPC Class Codes: Y02E 40/70 Smart grids as climate change mitigation technology in the energy generation sector
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/22 Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
• CPC Class Codes: Y04S 10/40 Display of information, e.g. of data or controls
• CPC Class Codes: Y04S 10/50 Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
• CPC Class Codes: Y04S 20/00 Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof

Abstract

A system and method for operating a Unified Power Flow Controller (UPFC) connected to a SCADA (Supervisory Control and Data Acquisition) are disclosed. The UPFC automatic operation system receives power system data from the SCADA system, automatically determines UPFC'"'"'s optimum operation conditions according to power system states. The system includes: a UPFC acting as a serial/parallel FACTS to control variables of a power system; a SCADA for periodically acquiring line data of the power system and state data of the UPFC; and an upper controller for analyzing data received from the SCADA, and determining an UPFC'"'"'s optimum operation mode for each power system condition and UPFC'"'"'s optimum set-point control commands.

Claims

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; and

an upper controller for analyzing data received from the SCADA, and determining an optimum operation mode for each system condition and optimum operational references(set-point control commands).

2. The system according to claim 1, wherein the operational references (set-point control commands) are a line voltage, line active and reactive power flow

3. The system according to claim 1, wherein the system line data includes voltage data of each system bus, line flow data, and contact-point data of a circuit-breaker.

4. The system according to claim 1, wherein the UPFC state data includes analog data related to UPFC operation states, inverter'"'"'s driving state data, and valve or relay state data.

5. A method for automatically operating a UPFC in connection with a SCADA, the method comprising:

a) periodically acquiring, by the SCADA, system line data and UPFC state data, and transmitting the acquired data to an upper controller;

b) analyzing, by the upper controller, data received from the SCADA, determining an optimum operation mode for each power system condition and optimum references of power system variables, and transmitting the determined data to the SCADA; and

c) transmitting, by the SCADA, the optimum operation mode data and the optimum references of the system variables to the UPFC, and controlling a line voltage, active power, and reactive power of each system using the received optimum operation mode data and the system variables'"'"' optimum references received in the UPFC.

6. The method according to claim 5, wherein step b) includes:

b1) analyzing data received from the SCADA, and determining a system state;

b2) determining a control objective function appropriate for each state on the basis of the determined system state;

b3) determining an operation mode of the UPFC according to the determined control objective;

b4) executing an OPF process appropriate for each objective; and

b5) determining a flow in active/reactive power of a serial side of the UPFC and a voltage reference of a parallel side of the UPFC using the OPF execution result.