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EQ Steady State Special Topics Chuck DuBose, June 2015

Siemens Power Technologies International

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EQ Steady State Special Topics

Outline

•Transformer Models

•HVDC

•Short Circuit

•Dynamics

•Unbalanced Networks

•Q&A

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EQ Steady State Special Topics

Transformer Models

•Balanced Three Phase Transformer Model

•Tap Changers

•Transformer Voltage Attributes

•CGMES Phase Shifting Transformer Document

ENTSOE_CGMES_v2.4.14_28May2014_PSTmodelling.pdf

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EQ Steady State Special Topics

Transformer Models

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Ratio Tap Changer Model

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Phase Tap Changer Model

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EQ Steady State Special Topics

Transformer Voltage Attributes

•TransformerEnd.ratedU – Nameplate Voltage of the Transformer Winding

•TapChanger.neutralU – Voltage at the Neutral Tap

•RatioTapChanger.stepVoltageIncrement – Percent of neutralU

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EQ Steady State Special Topics

HVDC

•Old Rectifier/Inverter classes were removed

•Represent more detailed models

• DC switch classes

• DCConductingEquipment

• DCEquipmentContainer

• DCSeriesDevice

• DCTerminal

• ACDCConverterDCTerminal

• DCTopologicalIsland

•Associate AC equipment with DC Equipment

•Specific models for voltage and current source converters.

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EQ Steady State Special Topics

HVDC Containment

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HVDC Connectivity

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HVDC Converter Unit

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HVDC Example 301 Document Sec 4.4.13

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Short Circuit

•All short circuit data required by IEC 60909

•Most Data is integrated into the equipment records of the Wires Package

•Covered in a Separate Profile

•All positive sequence reactances on the synchronous machines are

saturated values to support short circuit

•Grounding

•MutualCoupling Class

•New Fault Package defines fault information

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Peterson Coil and Grounding

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PowerTransformerXF1

Termin

alTerm

inal

XF11

L1

Termin

al

ACLineSegment

TerminalGround

DisconnectorSC1

Terminal C1 Terminal

Termin

al

PetersenCoil1

Ground Disconnector

SC2Terminal L2

PowerTransformerXF2

Termin

al

Termin

al

phases=Nphases=N

phases=Nphases=N

phases=N

phases=ABC

phases=ABCNphases=ABCN

phases=ABC

XF21

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Mutual Coupling Class

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Mutual Coupling Example

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Terminal Terminal

Terminal Terminal

2.3 KM

5.8 KM

1.7 KM

Distance11 = 2.3

Distance12 = 8.1

First Terminal

Second Terminal

Distance21 = 1.7

Distance22 = 7.5

MutualCoupling Instance

. . .

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Fault Package

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Dynamics

•Totally Separate Package

•Hooks into classes in the Wires Package

•Generator and Load models are very detailed

•Undergoing extensive Vender Testing

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Dynamics Standard Signal Connections

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Dynamics to Equipment Connections

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ExcAC1A Exciter Example - CIM

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ExcAC1A Exciter Example - How It Works

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Dynamics Model Vender Testing Results

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Dynamics Model Vender Testing Results

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Dynamics - Future

•Still need DC, FACTS, Relay, Shunt Compensator Models

•Complete development of User Defined models

•Future of Distributed Energy Resources

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EQ Steady State Special Topics

Unbalanced Networks

•IEC 61970 standard

•Optional class and attribute selections to build unbalanced networks

• AclineSegmentPhase

• SwitchPhase

• EnergyConsumerPhase

• ShuntCompensatorPhase

• Terminal.phases

• TransformerTank and TransformerTankEnds

•Create open delta transformer banks

•Define single and two phase circuits for overhead and underground

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EQ Steady State Special Topics

Two Phase Unbalanced Transformer Model

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PowerTransformer

TransformerTank

TransformerTank

CN CNTerminal ABC phase

AC Phase PrimaryTransformerTankEnd

S23NTransformerTankEnd

S12NTransformerTankEnd

AB Phase PrimaryTransformerTankEnd

Terminal S123N phase

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Unbalanced Transformer Impedance Model

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Unbalanced Line Model 301 Document Sec 4.4.8

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Unbalanced Line Model UML

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EQ Steady State Special TopicsQ&A

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