Remote terminal unit and monitoring, protection and control of power systems

• US 20070206644A1
• Filed: 02/26/2007
• Published: 09/06/2007
• Est. Priority Date: 03/02/2006
• Status: Abandoned Application

• Current Assignee: ABB Technology AG (ABB Limited)
• Original Assignee: ABB Technology AG (ABB Limited)
• Inventors: Bertsch, Joachim, Suranyi, Andreas, Jaggy, Engelbert
• Application Number:
  US11/710,409
• Publication Number:
  US 20070206644A1
• Time in Patent Office: Days
• US Class Current: 370/503
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00016 using a wired telecommunication network or a data transmission bus
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• 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 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
• CPC Class Codes: Y04S 40/124 using wired telecommunication networks or data transmission busses

Abstract

The disclosure relates to phasor-based monitoring, protection and control applications in electric power systems supervised and/or managed by a Supervisory Control And Data Acquisition/Energy Management System (SCADA/EMS). In order to enable the applications without incurring heavy infrastructural investments, a phasor measurement facility is integrated into a Remote Terminal Unit (RTU) that is part of the SCADA/EMS system and comprises Input/Output (I/O) interfaces hard-wired to a substation of an electric power system. By taking advantage of the fact that RTUs as indispensable building blocks for any SCADA/EMS are part of every substation of the power system, no extra housing, cabling and EMC shielding for the additional functionality needs to be provided.

Claims

1. A Remote Terminal Unit (RTU) comprising:

first data acquisition means for acquiring, at a first sampling rate below a network frequency of the power system, first network data to be evaluated by a Supervisory Control And Data Acquisition/Energy Management System (SCADA/EMS) managing an electric power system;

synchronization means providing time-stamps for global time synchronization; and

second data acquisition means for acquiring, at a second sampling rate above said first sampling rate, time-stamped synchronized phasor data.

2. The RTU according to claim 1, comprising a communication gateway for communication with a distant Network Control Centre (NCC) of the SCADA/EMS system arranged in a core-RTU, wherein the synchronization means and the second data acquisition means are arranged in a sub-RTU distant from the core-RTU and connected to the core-RTU via dedicated inter-RTU communication means.

3. The RTU according to claim 1, wherein the second data acquisition means is connected to a communication gateway for communicating the time-stamped synchronized phasor data to a distant Network Control Centre (NCC) of the SCADA/EMS system.

4. A method of performing, based on time-stamped synchronized phasor data, Wide-Area (WA) monitoring, protection and control applications on an electric power system, wherein the power system is managed by means of a Supervisory Control And Data Acquisition/Energy Management System (SCADA/EMS) including a Remote Terminal Unit (RTU) located at a substation of the power system, and wherein the RTU comprises first data acquisition means for acquiring, at a first sampling rate below a network frequency of the power system, first network data to be evaluated by the SCADA/EMS system, the method comprising

providing time-stamps for global time synchronization by synchronization means and acquiring, at a second sampling rate above said first sampling rate, time-stamped synchronized phasor data by second data acquisition means, wherein the synchronization means and data acquisition means are arranged in the RTU.

5. The method according to claim 4, comprising communicating the time-stamped synchronized phasor data to a distant Network Control Centre (NCC) of the SCADA/EMS system via a communication gateway connected to the second data acquisition means.

6. A Wide-Area (WA) monitoring, protection and control system for performing Wide Area monitoring, protection and control applications on an electric power system, wherein the power system is managed by means of a Supervisory Control And Data Acquisition/Energy Management System (SCADA/EMS) including a Remote Terminal Unit (RTU) located at a substation of the power system, wherein the RTU comprises:

first data acquisition means for acquiring, at a first sampling rate below a network frequency of the power system, first network data to be evaluated by the SCADA/EMS system,

synchronization means providing time-stamps for global time synchronization, and second data acquisition means for acquiring, at a second sampling rate above said first sampling rate, time-stamped synchronized phasor data to be evaluated by the WA monitoring, protection and control system.