Visualization with WAMS and PMU

Stephen Lee, EPRITechnical Executive slee@epri.comJune 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