MDMS Report to NYSRC EC
Project Update
GES 09/11/15
Topics
• Angle Estimation/Prediction Concept
• Project Schedule
Concept
• Using estimates of angle difference between two equivalent
generation centers (and their rates of change) a prediction
can be made of angle difference in the future
• Preemptive action can be taken in advance
• A simplified dynamic model using a spring/mass or torque
angle/inertia can be applied
• A simple estimation concept can be used to estimate angle
and angle rate (delta and omega)
• A state transition matrix can be used to carry the estimate
forward
Oscillation Model
GENERATION
EQUIVALENT UPNY
GENERATION
EQUIVALENT SENY
Estimation Process
MEAS NOISE
V
DR NOISE
STATE
MEAS
MEAS RESIDUAL
+
X
Z
Ztilda
+
W
TRUE SYSTEM DYNAMICS
MEASUREMENT
DELTA
OMEGA
OMEGA DOT
OMEGA DDOT
*
*
DELTA
-
ESTIMATE OF STATE
ESTIMATED MEAS
Xhat
MODEL SYSTEM DYNAMICS
(SPRING MASS OSCILLATION)
Zhat
MEASUREMENT
DELTA
OMEGA
DELTA
+
delta Xhat
GAIN
Prediction Concept
ESTIMATE OF STATE
ESTIMATED FUTURE STATE
Xhat(Tk)
COULD BE OTHER CRITERIA
eg INVOLVING DELTA AND OMEGA
Xhat(Tp)
TRANSITION MATRIX
DELTA
> 120 DEG ?
DELTA
OMEGA
DELTA
OMEGA
k
p
ARM OOS RELAYS ON LINES OF CHOICE PLUS OTHER ACTIONS
OR
TRIP SELECTED LINES PLUS OTHER ACTIONS
OR
……………………
Use of Estimated/Predicted Angle
to Supervise Local Protection
MDMS ALGORITHM
PMU
PHASE ANGLE
PRE PROCESS
PMU
ACTION
REQUIRED?
SPECIFIC
ACTION
Other
Remedial
Actions
PMU
PMU
OOS
OOS
SUPERVISION:
BLOCK TRIPPING ON OOS
ENABLE TRIPPING ON OOS
MODIFY SETTINGS
OOS
OOS
OOS
OOS
Local Out of Step Relay
Systems Detect OOS
Conditions can:
-Block Tripping
-Enable Tripping
-Block Reclosing
OOS
OOS
OOS
OOS
OOS
OOS
ALL MAJOR BUSES HAVE OUT OF STEP PROTECTION:
OUT OF STEP TRIPPING
OUT OF STEP BLOCK TRIPPING
OUT OF STEP BLOCK RECLOSING
7
Planned Events
• 10/7/15 – Tech Workshop @ NYISO
– Review implementation details of protection
schemes and mitigation measures
– Review simulation case details/models
• 12/3/15 ? – Final Presentation Workshop
@NYISO
– Final Test Results
– Final Report
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