Substation Automation IT

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					Substation Automation IT

       Mladen Kezunovic
     Texas A&M University

         PSerc Retreat
         August 10, 01
Problems to be solved (general)
 Enhancing Reliability and Security of Network
  Operation
 Making Network Availability ( quick restoration)
  a major requirement
 Introducing Quality of Service as an additional
  constraint
 Enabling operators to act more efficiently and
  with greater confidence in difficult (sometimes
  unclear, unexpected or even conflicting)
  circumstances
Substation Automation Functions
 Data Acquisition: KHz sampling rate, synchronized
  sampling,GPS, continuous monitoring,double buffered
  memory, ample data redundancy, every contact, V and I
 Data Processing: computation of phasors, sequence values,
  sequence of events, P, Q, Energy, harmonics, sags,
  detection and classification of faults, fault location,
  equipment diagnostics, synchro-check, out of step,
  topology processor, breaker failure protection, etc
 Local Applications: monitoring, control and protection
 Applications requiring coordination with other sites:
  exchange of information with neighboring substations
  (protection), exchange of information with EMS functions
  (switching sequences, LTC control, state estimation,etc)
              Current approach
  LEVEL I     CFL       MS         PE     EMS
CENTRALIZED
 LOCATION
                                         RC


   LEVEL II                   IS          SC
 SUBSTATION
                    LMS


  LEVEL III
SWITCHYARD     FL   DFR      IED   PR    RTU    SOE
 INTERFACE
               A    S    A   S A   S A   S A    S A
        Substation Automation IT
   UCA: LAN in a substation connected to the corporate
    WAN; protocols making each substation device directly
    accessible from any user point (local or remote)
   Wireless and optical links: addressing the issues of
    speed,cost of wiring, and electromagnetic interferences
   IEDs: universal, programmable devices, capable of peer-
    to-peer, master-slave and point-point communications
   Sensors: OCT, OVT, temperature, stress, vibration, partial
    discharges, gas-in-oil, pressure, video image, frequency
    Software: open architecture, modular design,client-
    server,mobile agents, internet services, local database
   Intelligent Systems: NN, Genetic Algorithms, Expert
    Systems, Wavelets, DSP, “Smart” GUI, Hybrid systems
                  CHALLANGES
   Introducing IT at all levels: EMS, DMS, Substations,
    Feeders
   Developing new applications amenable to distributed
    processing (power plants, substations, feeders)
   Enhancing existing EMS applications using hierarchical
    processing and decision making
   Finding new ways of utilizing the same data for different
    purposes (engineering, operations and planning, control,
    protection, maintenance)
   Providing the latest IT to the utility industry
    (retrofitting,step-by-step deployment, upgradeability,
    portability, modularity, open architectures, etc)