The document summarizes the development of a wide area power system visualization software using synchrophasor measurements. It describes the objectives to improve situational awareness, the system architecture with data transfer from PDCs to the application server, and techniques used to improve performance for near real-time event replay. Testing of the beta version at TVA is discussed, along with visualization displays for frequency, voltage magnitude, and phase angle. The summary concludes that good progress was made in design, development, and integration testing of the software.

1. Wide Area Power System Visualization
&
Near Real-Time Event Replay
Using SynchroPhasor Measurements

2. Wide Area Power System Visualization Objectives
2© 2009 Electric Power Research Institute, Inc. All rights reserved.
• Improve operator situational awareness
• Perform wide area power system visualization using
real-time synchrophasor measurements for
– Real-time reliability monitoring
– Real-time large event detection
– Near real-time event replay
– Location of disturbance
• Perform event replay for post event analysis

3. System Architecture Overview
WA PS Visualization Application
Via Internet or Intranet
On-line Event
Trigger
Event Oriented
Application Database
Location of
Disturbance
Visualization
Web Service
Data Transfer
SuperPDC
Data ServerApplication Server
Web Server
Application Service
with Memory
Residence DB
3© 2009 Electric Power Research Institute, Inc. All rights reserved.

4. Performance Challenges
4© 2009 Electric Power Research Institute, Inc. All rights reserved.
•Transfer large volume of synchrophasor
measurements from distributed phasor data
concentrators (PDC) to application server.
•Transfer synchrophasor measurements from
application server to each user’s computer.
•Perform near real-time event replay for on-going
event by large number of users.
•Perform post event analysis while each user may
replay different events.

5. Techniques for Performance Improvements
5© 2009 Electric Power Research Institute, Inc. All rights reserved.
• Improve performance of real-time reliability monitoring
– Use memory residence object-oriented database
– Transfer 1 or 2 samples per second when there is no
events
• Improve performance of near real-time event replay and post
event analysis
– Use event oriented application database
– Efficiently handle event related synchrophasor data
– Replay events locally fully utilizing user’s computer
resources

6. Wide Area Power System Visualization Main Features
6© 2009 Electric Power Research Institute, Inc. All rights reserved.
• Real-time security monitoring using real-time
synchrophasor measurements
• On-line event detection
• Near real-time event replay
• Location of disturbance
• Post event analysis
• High performance visualization
 Frequency contour
 Voltage magnitude contour
 Voltage angle contour
 Angle differences
 Trending charts
 Dashboards

7. Wide Area Power System Visualization
Integration & Performance Testing
7© 2009 Electric Power Research Institute, Inc. All rights reserved.
• Deployed beta version of wide area visualization
application at TVA in October of 2009
• Integrated with SuperPDC at TVA in October of 2009
• Integrated with OpenPDC in January of 2009 performed by
TVA
• Performed integration testing using real-time
synchrophasor measurements of Eastern Interconnection
• Performed testing using 45 simulated PMUs in NYISO area

8. Near Real-Time Event Replay Testing Results
49 PMUs with 300s event data (about 10MB) Using a Laptop
8© 2009 Electric Power Research Institute, Inc. All rights reserved.
Traditional Approach
(Second)
New Approach
(Second)
Insert event data into event
database from PMU data server
644 33
Read event data from event
database from application server
25 1
Visualization display shows up
after an event is detected.
858 About 5

9. Frequency Visualization Display using 1000 MW
Generator Outage Data on March 22, 2006
9© 2009 Electric Power Research Institute, Inc. All rights reserved.

10. Voltage Magnitude Contour Display
Using Real-Time SynchroPhasor Measurements
10© 2009 Electric Power Research Institute, Inc. All rights reserved.

11. Phase Angle Contour Display
Using Real-Time SynchroPhasor Measurements
11© 2009 Electric Power Research Institute, Inc. All rights reserved.

12. Frequency Contour Display
Using Real-Time SynchroPhasor Measurements
12© 2009 Electric Power Research Institute, Inc. All rights reserved.

13. Summary
13© 2009 Electric Power Research Institute, Inc. All rights reserved.
• Made very good progress in the design,
development and integration testing of wide
area power system visualization software
• Developed power system visualization
technologies for meeting performance
requirements
• Allowed operators to perform near real time
event replay to track on-going event
• Completed integration and testing of a beta
version of visualization software at TVA

14. Acknowledgement
Funding and Technical Support
• The current EPRI R&D projects of wide area power system
visualization using synchrophasor measurements are funded by
– TVA
– ConEd
– NYSERDA
– EPRI Technology Innovation (TI)
• Technical supports: TVA, Virginia Tech, NYISO, NYPA, ConEd
and LIPA
14© 2009 Electric Power Research Institute, Inc. All rights reserved.

15. DOE Demonstration of a Novel Synchrophasor
Based Situation Awareness System
15© 2009 Electric Power Research Institute, Inc. All rights reserved.
• DOE issued the contract on September 30, 2009.
• Project will be completed in 3 years.
• Large scale demonstration using synchrophasor
measurements for
• Real-time reliability monitoring
• On-line event detection and location of disturbance
• Near real-time event replay
• Post event analysis
• Early warning of potential system problems
• Project teams: EPRI, TVA, Yilu Liu of UTK and HTC Tech

16. Deliverables
16© 2009 Electric Power Research Institute, Inc. All rights reserved.
• Technical report
• Demonstration using synchrophasor measurements
– Wide area power system visualization for real-time
reliability monitoring
– Near real-time event replay
– Early detection of system problems (TVA area)
• Software installation guide and user guide
• Technical training
• One technical workshop at the end of Phase 1
• One technical workshop at the end of Phase 3