The Hydro Québec De-icer Project at Lévis Substation

HVDC and FACTS Subcommittee, Calgary, July 29 2009

PresenterChris Horwill : AREVA T&D

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Background

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Why a de-icer?

In December 1998, the Québec region of Canada was hit by one of the worst ice-storms in recorded history

The ice storm generated ice build-up as much as 75mm

An accumulation of ice toppled hydro towers and downed hundreds of kilometres of high-voltage transmission lines.

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De-icer: Location

De-icer atLévis Substation

Québec city

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Lines for de-icing

315 kV183kmRivière du Loup

3078 / 3079

735 kV242kmBergeronnes7007

735 kV78kmAppalaches7097

735 kV62kmJacques Cartier

7010 +7020

735 kV27kmLaurentides7010

VoltageLengthDestinationLine

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De-icer Mode: Main design ratings

Main Ratings:

Standard de-icer mode - “Nameplate rating” :250MW, 7200A / ±17.4kV @ +10°C

Verification mode : 200MW, 5760A / ±17.4kV @ +30°C

1 hour overload :300MW, 7200A / ±20.8kV @ +10°C

Low ambient overload : 275MW, 7920A / ±17.4kV @ - 5°C

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De-icer Mode: Main design ratings

Because of the different characteristics of the sections, the operating range of current and voltage is large

6000 A

DC voltage

DC current600 A 1000 A 7200 A3600 A

2.0 kV

41.6 kVVref = 34.8 kV

Verification

De-icing

Temporary overload

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SVC Mode: Main design ratings

Main ratingsDynamic range

+225 Mvar / -115 Mvar at nominal voltage

Target voltage315 kV ± 5%

Slope

3% on 225 Mvar

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Solution

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One line diagram

TSC154Mvar

5/11 and 7/13filters 70Mvar

HP filter55Mvar

HP filter55/12Mvar

DC filters315kV

43kV

20kV

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One line diagram: De-icer mode

TSC154Mvar

5/11 and 7/13filters 70Mvar

HP filter55Mvar

HP filter55/12Mvar

DC filters315kV

43kV

20kV

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One line diagram: SVC mode

TSC154Mvar

5/11 and 7/13filters 70Mvar

HP filter55Mvar

HP filter55/12Mvar

DC filters315kV

43kV

20kV

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Control Performance Verification

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Testing of Control System

Development of Master Control - DCU (De-icer Control Unit)

Validation of DNP3 Communication

Type test on Real Control (System V)

Static and Dynamic Performance Test on DevelopmentControl Cubicle & Simulator

Additional tests on a Control Replica at IREQ

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Additional Testing on a Control Replica (RSPC1)

Provide additional testing facility ( In parallel to Factory Test)

MBPSS( Multi-Band Power System Stabilizer)Geomagnetic influenceContingencies (additional validation)

Final validation of UCD Validation of Acceptance Test programTraining (Operator and Field technician)

PrimaryPrimary ObjectivesObjectives

Replica connected to HYPERSIM (IREQ simulator)

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Additional Testing on a Control Replica (RSPC1)

TCR VBE

TSC VBE

SVC/Decier Control &Protection

PROFIBUSMASTER

A/I

A/O

D/I

D/O

PowerSupply

HYPERSIM

APEX

UCD

HYPERSIM

PROFIBUSSLAVE

VALVE FIRING

VALVE FIRINGDATA BACK

Interface

FIRING SIGNAL

MBPSSFunction

Equivalent AC networkTSC valveTCR/De-icer valveReactive elementsCoupling transformersEarthing transformersDischarge transformer

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Simulator Setup

HYPERSIM

RSPC1

UCD

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De-icer mode

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Preparation for commissioning

Deicer mode - particular tests singled out 1. Converter Deblocking in current control

2. Review trip sequence – Overvoltage caused by remote isolation of the converter

3. Dc voltage measurement failure

4. Ac Voltage Error (Fuse failure)

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Remote Isolation of the Converter

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Normal Shutdown Sequenceby local breaker opening

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Deicer mode – Remote Shutdown

No control action

Severe Overvoltage

when connected to longest (247km) line

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Deicer mode – Remote Shutdown

Current detection & Control action

No Overvoltage

Preliminary investigationLocal detection preferred

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Limitation of OvervoltageNew Protection Philosophy

629.77

389.12

0

100

200

300

400

500

600

700

600 1200 1800 2400 3000 3600 4200 4800 5400 6000 6600 7200 7800

Iorder (A)

Vhvm

ax (k

V)

Existing With New Prot Philosophy

kV

kV

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De-icer installation

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De-icer installation

DC converter valves

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De-icer installation

AC coupling reactors

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De-icer installation

HV connections and transformer

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De-icer installation

Harmonic filters

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De-icer installation

DC filters and DC bus

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De-icer installation

Aerial view of the de-icer

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De-icing tests

Connecting de-icer to line

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Commissioning

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TCR current

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Response to undervoltage

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Response to overvoltage

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Bridge 2 deblocked

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Ramp Up 3300A to 7200A

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Ramp Up 3300A to 7200A TSC Unblocked

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Ramp Down 5000 A to Standby

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Ramp Down 5000 A to Standby

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Ramp Down 5000 A to Standby

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Shutdown

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Shutdown – Action of ERM

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De-icer

In service as an SVC during the winter

Unique project made possible by good collaboration between Hydro Québec and AREVA

Many technical hurdles overcome to make the installation a success