STATE ESTIMATOR QUALITY TRACKING IN BC Hydro EMS IMPLEMENTATION

1
STATE ESTIMATOR QUALITY TRACKING IN BC Hydro EMS
IMPLEMENTATION

• Dr. DJORDJE ATANACKOVIC, P.Eng.
• Engineering Team Leader, Power system
  Applications, Grid Operations Support

2
STATE ESTIMATOR GENERAL PERFORMANCE REQUIREMENTS

• CONVERGENCE SUCCESS RATE OF 98
• COST FUNCTION IN THE RANGE OF 8000 11000
  (2500 BUSES, 4000 ANALOG MEASUREMENTS)
• TOTAL GENERATION ERROR lt 40 MW
• TOTAL INTERCHANGE ERROR lt 10MW
• MAX. MW BUS MISMATCH lt 50MW
• TOTAL LOAD ALLOCATION ERROR lt 400MW

3
STATE ESTIMATOR QUALITY MONITORING NEW INDICES

• TOTAL LOAD ALLOCATION ERROR
• TOTAL MW, MVAR LINE FLOW RESIDUAL PER MEASUREMENT
• TOTAL MW, MVAR INJECTION RESIDUAL PER MEASUREMENT
• TOTAL VOLTAGE AND CURRENT RESIDUAL PER
  MEASUREMENT

4
STATE ESTIMATOR QUALITY MONITORING TOTAL LOAD
ALLOCATION ERROR

• CALCULATED AS A SUM OF LOAD RESIDUALS FOR ALL
  LOADS IN BC HYDRO AREA
• LOAD RESIDUAL IS A DIFFERENCE BETWEEN ESTIMATED
  LOAD AND ALLOCATED LOAD
• BC HYDRO PERFORMANCE CRITERIA
• TOTAL LOAD ALLOCATION ERROR SHOULD NOT EXCEED 600
  MW MAXIMUM
• AVERAGE LOAD ALLOCATION ERROR OVER A PERIOD OF
  ONE YEAR SHOULD NOT EXCEED 400 MW

5
STATE ESTIMATOR QUALITY MONITORING TOTAL MW,MVAR
LINE FLOW RESIDUAL PER MEASUREMENT

• CALCULATED AS A SUM OF MW/MVAR LINE FLOW
  RESIDUALS FOR ALL MEASUREMENTS IN THE CONSIDERED
  ZONE DIVIDED BY NUMBER OF MEASUREMENTS
• THREE ZONES ARE USED FOR THIS TRACKING
• TRANSMISSION (230 KV AND ABOVE)
• SUBTRANSMISSION (60 138KV)
• DISTRIBUTION (BELOW 60 KV)
• BCTC PERFORMANCE CRITERIA FOR A PERIOD OF ONE
  YEAR
• TRANSMISSION - BELOW 7 MW
• SUBTRANSMISSION - BELOW 15 MW
• DISTRIBUTION - BELOW 20 MW

6
STATE ESTIMATOR QUALITY MONITORING TOTAL MW,MVAR
INJECTION RESIDUAL PER MEASUREMENT

• CALCULATED AS A SUM OF ALL INJECTION RESIDUALS IN
  A CONSIDERED ZONE DIVIDED BY NUMBER OF
  MEASUREMENTS IN THE ZONE
• BCH PERFORMANCE CRITERIA FOR A PERIOD OF ONE
  YEAR
• TRANSMISSION BELOW 3 MW
• SUBTRANSMISSION - BELOW 7 MW
• DISTRIBUTION - BELOW 10 MW

7
STATE ESTIMATOR QUALITY MONITORINGNORMALIZED
RESIDUALS

• ENABLES RANKING OF MEASUREMENTS OF DIFFERENT
  TYPES (MW, MVAR, AMPS, KV) BASED ON A NORMALIZED
  INDEX
• BCH PERFORMANCE CRITERION
• NORMALIZED RESIDUAL GREATER THAN 10 UNITS
  INDICATES A MEASUREMENT OF A LOWER QUALITY
• NEEDS IMPROVEMENT DOES NOT REFLECT ERRORS OF
  GENERATOR UNIT MEASUREMENT AND OTHER INJECTION
  MEASUREMENTS

8
STATE ESTIMATOR QUALITY MONITORINGCONSISTENCY OF
VOLTAGE STABILITY REGION
9
STATE ESTIMATOR PERFORMANCE TRACKING

• TRACK SOLUTION QUALITY INDICES IN PI
• IMPROVE ONLINE SEQUENCE DISPLAY TO INCLUDE ALERT
  SIGNALS (FLASHING APPLICATION STATUS BOXES)
• MONITOR IMPACT ON OTHER APPLICATIONS E.G. VSA
• PERFORM REGULAR REAL TIME TELEMETRY QUALITY
  ANALYSIS AND PRODUCE TELEMETRY QUALITY REPORTS
• ISSUE TELEMETRY CALIBRATION REQUESTS
• RTNET SOLUTION INVALIDATED IF QUALITY MEASURES
  OUTSIDE PERFORMANCE LIMITS

10
BASIC QUALITY INDICES
11
AVERAGE MEASUREMENT RESIDUALS
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
QUESTIONS?