PEPCO

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PEPCOs Experience with Historian

• EMS Users Group
• March 14, 2000
• Potomac Electric Power Company

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PEPCO Needs

• Electric system data archive
• Corporate wide EMS data access
• Operations
• Planning
• Maintenance
• Data security

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Historian System

• Collects stores real time data from Energy
  Management System for archival
• Architecture is client/server
• Uses multiple compression algorithms

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Historian Features

• Collects the following data types with quality
• Status
• Analogs
• Accumulator
• Data from the Ranger Integrated Data Base (IDB)
• Provides interface to PC based commercial
  software (Excel, Word, etc.)

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Historian Features (Cont.)

• Provides input to applications such as load
  forecast, state estimation, etc.
• Output in tabular or graphic form
• Provides security

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Historian System

• Data flow overview

Microsoft EXCEL
SCADA EMS Applications
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PEPCO Historian Users

• Operations
• Planning
• Maintenance

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Use of Historian for Operations

• Track current electric system conditions
• Spreadsheet (tabular)
• One line (graphical display)
• Power Flow/Contingency Analysis
• Retrieve historical data for switching decisions
• Trend line loading and voltages
• Clearance work

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Use of Historian for Planning

• Monitor equipment performance
• Track system load and power factor profiles used
  in construction recommendations
• Power flow/contingency analysis
• Calculate electric system losses

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Use of Historian for Maintenance

• For PEPCOs new Maintenance Management System
• Help transition from preventive to
  predictive/proactive maintenance approach

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Pepcos IMMSDesired System Set Up
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Maintenance System Payoff

• Preparation for changing utility operations
• Better track maintenance history and maintenance
  patterns
• Better utilize work force for multi-skilling
  efforts
• Provide better reliability of equipment readiness

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Historian Examples

• Excel spreadsheets
• One-lines
• Charts and graphs

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Operations Emergency Example
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Historian One-Line Example
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Frequency Deviation Example
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Historian Excel Example
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Lambda vs LMP Comparison
Lambda LMP
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LMP and Transmission Congestion
Four Representative LMPs--When Identical, No
Transmission Congestion
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Transfer Limits and Actual Flowsfrom PJM OASIS
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Future Historian Uses

• Study State Estimation
• Distribution Automation
• External/outside utility data storage

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Summary

• Has capabilities that meet Pepcos needs for data
  archiving, data access and data security
• Excel interface provides for PC data analysis and
  graphical charting options
• Large potential for future uses