PEPCO’s Experience with PEPCO’s Experience with HistorianHistorian

EMS Users GroupEMS Users GroupMarch 14, 2000March 14, 2000

Potomac Electric Power CompanyPotomac Electric Power Company

PEPCO NeedsPEPCO Needs

• Electric system data archiveElectric system data archive

• Corporate wide EMS data accessCorporate wide EMS data access– OperationsOperations– PlanningPlanning– MaintenanceMaintenance

• Data securityData security

Historian System Historian System

• Collects & stores real time data from Collects & stores real time data from Energy Management System for archivalEnergy Management System for archival

• Architecture is client/serverArchitecture is client/server

• Uses multiple compression algorithmsUses multiple compression algorithms

Historian FeaturesHistorian Features

• Collects the following data types with quality:Collects the following data types with quality:– StatusStatus– AnalogsAnalogs– AccumulatorAccumulator– Data from the Ranger Integrated Data Base (IDB)Data from the Ranger Integrated Data Base (IDB)

• Provides interface to PC based commercial Provides interface to PC based commercial software (Excel, Word, etc.)software (Excel, Word, etc.)

Historian Features (Cont.)Historian Features (Cont.)

• Provides input to applications such as load Provides input to applications such as load forecast, state estimation, etc.forecast, state estimation, etc.

• Output in tabular or graphic formOutput in tabular or graphic form

• Provides securityProvides security

EMSDataBase

HistoricalHistoricalDataDataBaseBase

SCADAEMSApplications

Microsoft Microsoft EXCELEXCEL

• Data flow overviewData flow overview

Historian SystemHistorian System

PEPCO Historian UsersPEPCO Historian Users

• OperationsOperations

• PlanningPlanning

• MaintenanceMaintenance

Use of Historian for OperationsUse of Historian for Operations

• Track current electric system conditionsTrack current electric system conditions– Spreadsheet (tabular)Spreadsheet (tabular)– One line (graphical display)One line (graphical display)

• Power Flow/Contingency AnalysisPower Flow/Contingency Analysis

• Retrieve historical data for switching Retrieve historical data for switching decisionsdecisions

• Trend line loading and voltagesTrend line loading and voltages

• Clearance workClearance work

Use of Historian for PlanningUse of Historian for Planning

• Monitor equipment performanceMonitor equipment performance

• Track system load and power factor profiles Track system load and power factor profiles used in construction recommendationsused in construction recommendations

• Power flow/contingency analysisPower flow/contingency analysis

• Calculate electric system lossesCalculate electric system losses

Use of Historian for Use of Historian for Maintenance Maintenance

• For PEPCO’s new Maintenance Management For PEPCO’s new Maintenance Management System System – Help transition from preventive to Help transition from preventive to

predictive/proactive maintenance approachpredictive/proactive maintenance approach

Pepco’s IMMSPepco’s IMMSDesired System Set UpDesired System Set Up

M axim oReliabilityCentered

M aintenancePerform a

M aintenanceRankingAssesor

Traqs

HistorianAsset

RegistryData

W arehouse

UtilityIntergrated

Bus

OtherApplicationsto be added

Maintenance System PayoffMaintenance System Payoff

• Preparation for changing utility operationsPreparation for changing utility operations

• Better track maintenance history and Better track maintenance history and maintenance patternsmaintenance patterns

• Better utilize work force for multi-skilling Better utilize work force for multi-skilling effortsefforts

• Provide better reliability of equipment Provide better reliability of equipment readinessreadiness

Historian ExamplesHistorian Examples

• Excel spreadsheetsExcel spreadsheets

• One-linesOne-lines

• Charts and graphsCharts and graphs

Washington, DCDowntown

PEPCO

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

PEPCO

Washington, DCDowntown

Washington, DCDowntown

PEPCO

20:2

7:17

20:2

7:39

20:2

8:00

20:2

8:22

20:2

8:44

20:2

9:05

20:2

9:27

20:2

9:48

20:3

0:10

0

20

40

60

80

100

120

MW

TIME (h:mm:s)

Station "C" MW Profile

C-1

C-2

C-3

C-4

C-5

NRBK13.15118-X .AV 96 1/17/99 16:04NRBK13.15119-X .AV 118NRBK13.15120-X .AV 0NRBK13.15121-X .AV 99NRBK13.15122-X .AV 135NRBK13.15123-X .AV 122NRBK13.15124-X .AV 116NRBK13.15125-X .AV 114NRBK13.15126-X .AV 125NRBK13.15127-X .AV 102NRBK13.15128-X .AV 249NRBK13.15129-X .AV 128

1/11/99NRBK69.1TSW .AV 97.9NRBK69.2TSW .AV -0.1NRBK69.3TSW .AV 126.8NRBK69.4TSW .AV 80.2

305

This was used to look at the feeder load just prior to losing the substation. This aided us in restoring the feeders through ties since we were unable to restore the 13kV busses. It was also used to look at the Station load to determine the amount of load the station would have on a typical Monday, this information was used to determine the number of transformers needed in service to carry the station.

Operations Emergency Example

23016

C #1

C #2

C #3

C #4

C #5

90

2

85

6

106

7

109

3

108

6

57 -63

56 -63

23106

23107

POTOMACRIVER

PALMERS CORNER

ALABAMAAVENUE

BUZZARD POINT

-175 0 3 -183

23093

23091

23092

23090

134 47

143 77

23088

23089

116 35

155 110

135 33

23016

23026

23027

69kV

TOTAL GENERATION : NET INTERCHANGE :

TOTAL SYSTEM LOAD:

MW MVAR2736 -27550 1683284 141

Historian One-Line Example

23032

23034

23033

23035

23111

23102

23101

23103

23104

CT #1

CT #2

D #1

D #2

D #3

Sta. "H"

Dickerson

1 1

0 0

-193 42

-222 -20

-0

-0

63 -42

53 -41

-67 42

-20 44

0 0

0 0

156 26

133 31

0 0

QUINCE ORCHARDMT. ZION

23022

23024

23023

23025

168 -32

83 -22

50 23

-9 -10

23122

23014

23123

23015

-223 131

-109 17

BRIGHTON

23012

23013

23014

23015

-21 -88

-95 -39

-144 66

-35 31

23042

23044

23043

23045

179 -18

181 11

91 -43

202 11

2314 2334

-177

-16

-147

-41

2341

2340

47 57

31 -36

E #1 E #2 E #3

330

20

367

39

642

86

558

52

F #1 F #2

0

0

0

1

BOWIE

OAK GROVE

CHALK POINTMORGANTOWNBURCHES HILL

BELLS MILLNORBECK

MTEZEROTT RD.

23028

23030

23029

23031

23009

44-10

23011

62-12

54-10

38-20

23008

23010

23040

23046

23041

23047

-193-20

-147-23

-18

-124-30

-192-2

-21324

24442

222-22

23065

23054

23045

23042

-205 -18

-178 8

23062

23064

270 -34

264 -21

-228

-27

-238

-21

-261

1

-272

31

23065

23063

23064

23062

23074

23072

23073

23071

-177 15

-174 8

135 -16

134 -8

BURTONSVILLE

-94

2

-39

7

-39

-1

-96

4

23076

23086

23085

23077

147-27

149-24

54-9

55-2

23087

23067

23068

23066

-11734

-12037

23081

23082

5011

5053

5055535 -21 -324 179

241 -146

5072

-305 149

5071

-219 -23

5070

144 14

5071

222 45

382

101

E #4

-0

76

-520

33

Open

-89 7

-164 38

-151 37

-133 43

23060

23059

23061

23058

RITCHIE

-114 5123016

86 0

135 1623001

23002

A #15

A #16

0

-0

0

0

C #1

C #2

C #3

C #4

C #5

84

3

80

1

106

10

109

-3

106

-1

55 -63

53 -62

23106

23107

POTOMACRIVER

PALMERS CORNER

ALABAMAAVENUE

BUZZARD POINT

-193

-2

-3

-66

-0

-68

-201

-3

23093

23091

23092

23090

127 127

160 80

23088

23089

118 43

170 114

148 115

23016

23026

23027

500kV

500kV

69kV

500kV

69kV

RYCEVILLE

HAWKINS GATE

446

-10

TOTAL GENERATION : NET INTERCHANGE :

TOTAL SYSTEM LOAD:

MW MVAR3133 221195 1023325 322

93.51

118.22

118.85

119.50

118.24

118.61

118.53

118.95

117.62

117.85

59.975

59.980

59.985

59.990

59.995

60.000

60.005

60.010

60.015

11:5

5:00

11:5

5:40

11:5

6:20

11:5

7:00

11:5

7:40

11:5

8:20

11:5

9:00

11:5

9:40

12:0

0:20

12:0

1:00

12:0

1:40

12:0

2:20

12:0

3:00

12:0

3:40

12:0

4:20

12:0

5:00

12:0

5:40

12:0

6:20

12:0

7:00

12:0

7:40

12:0

8:20

12:0

9:00

12:0

9:40

12:1

0:20

12:1

1:00

12:1

1:40

12:1

2:20

12:1

3:00

12:1

3:40

12:1

4:20

12:1

5:00

Fre

qu

ency

Frequency Deviation Example

PJM06 Current

APS-PJM SCHEDULE -584 EASTERN TRANS. 3061CEI-PJM SCHEDULE -444 EASTERN TRANS LIMIT 4783VP-PJM SCHEDULE -338 EASTERN MARGIN 1737

NYPP-PJM SCHEDULE 675

PJM NET LOAD MW 29050PJM NEW GEN MW 30110PJM NET INT MW -1030

PJM SPINNING RES. 1120PJM OPERATING RES. 5266

BGE LOAD 3282WESTERN TRANS. 2397 BGE GEN 2941

WESTERN TRANS LIMIT 4375 BGE NET INT. MW 342WESTERN MARGIN 1964 BGE NET INT. MVAR 67

WEST-PJM SCHEDULE -1481 BGE SPINNING RES. 40WEST-PJM TIE FLOW -1114 BGE OPERATING RES. 74PJM WESTERN CIRC. 424 BGE/PEPCO NET INT. 790

BGE/PEPCO IMPORT LIM. 3600

DNW 8/12/98

Update

Historian Excel Example

Plot-0

I6 PEPCO Zone Price

4/16/99 05:15:37 AM 4/16/99 01:15:37 PM8.00 Hour(s)

SYDPJM.DLAMDA.I6

$MWH

PEPZONE

$/MWH

10

20

30

40

50

0

6037.00000

52.40000

SYDPJM.DLAMDA.I6

$MWH

PEPZONE

$/MWH

Lambda vs LMP ComparisonLambda vs LMP Comparison

Lambda LMP

Plot-0

PEPCO Zone Price Eastern Hub Western Hub Western_Int Hub

4/16/99 05:46:03 AM 4/16/99 01:46:03 PM8.00 Hour(s)

PEPZONE

$/MWH

EastHub

$/MWh

WestHub

$/MWh

West_IntHub

$/MWh

20

25

30

35

40

45

50

15

5536.50000

36.50000

36.50000

36.50000

PEPZONE

$/MWH

EastHub

$/MWh

WestHub

$/MWh

West_IntHub

$/MWh

LMP and Transmission Congestion

Four Representative LMPs--When Identical, No Transmission Congestion

Plot-0

PJM Xfer East Actual Flow PJM Xfer East Emerg Lmt PJM Xfer West Actual Flow PJM Xfer West Emerg Lmt

4/16/99 05:39:22 AM 4/16/99 01:39:22 PM8.00 Hour(s)

EastActFlow

MWH

EastEmergLmt

MWH

WestActFlow

MWH

WestEmergLmt

MWH

2500

3000

3500

4000

4500

2300

50003324.00000

4720.00000

2619.00000

4553.00000

EastActFlow

MWH

EastEmergLmt

MWH

WestActFlow

MWH

WestEmergLmt

MWH

Transfer Limits and Actual Flowsfrom PJM OASIS

Future Historian UsesFuture Historian Uses

• Study State EstimationStudy State Estimation

• Distribution AutomationDistribution Automation

• External/outside utility data storageExternal/outside utility data storage

SummarySummary

• Has capabilities that meet Pepco’s needs for Has capabilities that meet Pepco’s needs for data archiving, data access and data securitydata archiving, data access and data security

• Excel interface provides for PC data Excel interface provides for PC data analysis and graphical charting optionsanalysis and graphical charting options

• Large potential for future usesLarge potential for future uses