Visualization with WAMS and PMU
Stephen Lee, EPRITechnical Executive [email protected] 11, 2007
9th International Workshop on Electric Power Control Center – Lofthus, Norway
2© 2006 Electric Power Research Institute, Inc. All rights reserved.
Wide Area Frequency VisualizationSystem Architecture
Frequency Visualization Application(Smart Client) Microsoft .NET 2.0
On-Line Event Trigger
Application Database
Location of Disturbance
Frequency Visualization Web Service
Data TransferWeb Service
PMU/FNET Frequency Data Server
Frequency Application Server
(Frequency and event data)
Web Server
NON-TVA FNET Devices
3© 2006 Electric Power Research Institute, Inc. All rights reserved.
Wide Area Frequency VisualizationReal-Time Frequency Display
4© 2006 Electric Power Research Institute, Inc. All rights reserved.
Wide Area Frequency VisualizationPolygon Display for Event Replay
5© 2006 Electric Power Research Institute, Inc. All rights reserved.
Wide Area Frequency VisualizationFrequency Trending Display
Location of Disturbance by Virginia Tech
CAR, A Visualization and Analysis Tool for Transmission Operation and Planning
Stephen LeeTechnical ExecutivePower Delivery & Markets
The Community Activity Room (CAR) is a registered trademark of EPRI
CCommunityommunity
AActivityctivity
RRoomoom
®
7© 2006 Electric Power Research Institute, Inc. All rights reserved.
Reliability Condition of Power Grid Visualized with CAR
• The current operating point
• Operator knows how far from the Safe boundary
Scales of axes are in thousand MWs
• With CAR, grid operators will see clearly whether there is a reliability problem
• And if so, how to get back into the Safe region
8© 2006 Electric Power Research Institute, Inc. All rights reserved.
Boundary Conditions
Transmission and GeneratorConnectivity and Topology
Power Flows –
MWLo
ad a
nd V
olta
ge P
rofil
e
OperatingState – “You are here”
Inside Boundary Conditions
System OperatingLimits
Outside BoundaryConditions
Transmission and GeneratorConnectivity and Topology
Power Flows –
MWLo
ad a
nd V
olta
ge P
rofil
e
OperatingState – “You are here”
Inside Boundary Conditions
System OperatingLimits
Outside BoundaryConditions
Load
Genera
tion Disp
atch
9© 2006 Electric Power Research Institute, Inc. All rights reserved.
CAR (Community Activity Room) for TNB, Malaysia
• TNB has been a member of EPRI Program 39 (Grid Operations and Planning) for last three years
• TNB in 2005 set up a special project with EPRI to implement CAR for real-time operation
• Software consists of:– 1 copy of POM (Physical Operation Margin) by V&R, Los Angeles– 1 copy of OPM (Optimal Mitigation) by V&R, Los Angeles– CAR adapted for real-time operation and interfacing with POM,
also adapted for real-time operation• Initial delivery of a computer with POM/OPM and CAR, Nov 2005• Delivery and training of final version in June 2006• Statistical Visualization to be delivered in 2007
10© 2006 Electric Power Research Institute, Inc. All rights reserved.
Real-Time POM
11© 2006 Electric Power Research Institute, Inc. All rights reserved.
Real-Time CAR
12© 2006 Electric Power Research Institute, Inc. All rights reserved.
Online Reliability Monitor implemented at TNB in Malaysia (spider chart) Over 24 Hours
• Length and color of a spike indicates loading levels
• Each spike is linked to an overloaded or nearly overloaded constraint
13© 2006 Electric Power Research Institute, Inc. All rights reserved.
Online Reliability Monitor implemented at TNB in Malaysia (CAR) Over 24 Hours
14© 2006 Electric Power Research Institute, Inc. All rights reserved.
Conclusions
• Real-time POM/OPM and CAR were successfully installed and running for one year
• This project is providing many benefits to TNB:– Greater situational awareness for operators– Ability to keep more operation reliability data for
analysis– Ability to provide historical snapshots of contingency
analysis and reliability indices of overloads– Ability to analyze Probabilistic Reliability Assessment
using CAR and historical car files, for system planning
15© 2006 Electric Power Research Institute, Inc. All rights reserved.
Statistical Review of Constraints
Top Ten Transmission Constraints
0
100
200
300
400
500
600
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23
MW
MPSS - MCCA-2BTRK - BTRK-X2ATWR - BGJH-2ATWR - BGJH-1GRNE - GRNE-W1GRNE - GRNE-W2KGAR - KPLS-2PMJY - PLTG-2BBTU - BBTU-X1BBTU - BBTU-X3
Average of Overload
HH of Day
Constraint