refurbishment alternatives for hvdc installations...konti-skan pole 1 refurbishment project ....
TRANSCRIPT
Refurbishment Alternatives for HVDC Installations
Neil Kirby – Alstom Grid
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IEEE PES General Meeting July 2014 15.05.08 FACTS/HVDC Economics and Operating Strategies Panel
Panel Session : “Everything Old Is New Again! Refurbishing FACTS and HVDC”
Gaylord National Resort & Convention Center
National Harbor, MD
Refurbishment Alternatives
• Control System only
• Valves, Cooling & Control
• Complete Pole Replacement
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Konti-Skan HVDC Project Location - Original
KONTI - SKAN KONTI - SKAN
Vester
Hassing
Stenkullen
Lindome KS2
KS1
Energinet
Konti-Skan Pole 1 HVDC Project Location - New
KONTI - SKAN KONTI - SKAN
Vester
Hassing Lindome
KS2
KS1
Energinet
• Power 380MW • Voltage 285kV DC • Current 1350A DC • Bidirectional power flow • Key project aspects
– Two new 380MW converter stations in Sweden (Lindome) and Denmark (Vester Hassing)
– Replaces existing mercury arc valve stations – Minimum pole outage time
• Main station equipment: – Converter Valves – Transformers – AC and DC Filters
Konti-Skan Pole 1 Refurbishment Project
Refurbishment Drivers
• Mercury arc valves
– High maintenance costs
– Environmental concerns
• Power equipment at end of life
• Control equipment obsolete
• Full pole replacement was decided instead of progressive replacement
• Avoids prolonged pole outage
• Sea cables were re-used
• Bipole control minimizes sea return currents
Konti-Skan Pole 1 Single Line Diagram
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Sweden Denmark
Konti-Skan Valve Hall
Konti-Skan Vester Hassing (Denmark) Site
Konti-Skan Vester Hassing (Denmark) Site
Old Pole 1
New Pole 1
Pole 2
Konti-Skan - Vester Hassing (Denmark) Site
Konti-Skan - Vester Hassing (Denmark) Site
Konti-Skan - Lindome (Sweden) Site
Konti-Skan - Lindome (Sweden) Site
Pole 2
New Pole 1
AC Yard
Konti-Skan - Lindome (Sweden) Site
Sellindge
Les Mandarins
• 2 x 1000 MW, ±270 kV
• Commissioned:
– Bipole 1 - 1985
– Bipole 2 - 1986
• Availability: > 97.5 % (specified: 95 %)
Highest Utilisation of all HVDC Schemes: 99.5%
Primarily export France UK
Remains the World’s Largest HVDC Submarine Scheme
United Kingdom - France (Cross-Channel – IFA2000)
T1201
Sellindge
(NGC) The Channel
Les Mandarins
(EDF)
400kV
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
SVC
SVC
400kV
United Kingdom - France (Cross-Channel – IFA2000)
400kV GIS
Substation
Filters
SVC 2 SVC 1
Filters
Bipole 2 Control
Building
Bipole 1
Cable Route
Sellindge Converter Station, UK
Thyristor Valves – Sellindge, UK
T4218.1
Les Mandarins Converter Station, France
Thyristor Valves – Les Mandarins,France
Les Mandarins Converter Station, France
Filters
Cable Route
Bipole 2 Bipole 1
Control
Building
400kV Busbars
DC Area
Refurbishment Drivers • Availability of spare components for the air cooled
thyristor valve
– French station used GE “red box” design
• Obsolescence of the analogue electronic control systems
• Criticality of the inter-connector to the two owners
– Power support to both countries
– Economics of energy trading
• Power equipment still had 20 years life, so not replaced
IFA 2000 Refurbishment Project • Project awarded to Alstom in May 2008
• Replacement of air-cooled thyristor valves
• Installation of new water cooling system
• Replacement of control system with modern digital controller
• Significant penalties for contract delay and outage delay
Valve De-Construction - France
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Valve De-Construction - England
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New Valve Construction
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McNeill Back-to-Back
• Originally installed in 1989
• 150MW Back-to-Back HVDC system
• Remote Isolated Site
• Extreme climatic conditions
• Extremely Weak AC systems on both sides
In Canada, linking Saskatchewan and Alberta
… most northerly link between the WECC and
Eastern Interconnect
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Edmonton
McNeill
+/-150MW
USA
CANADA
McNeill Back-to-Back
• No redundancy in original control system
• Unique HVDC link with:
– Single circuit water/glycol cooling of valves
– No dc smoothing reactor
– Four-winding converter transformers
– Short-circuit power ratio of less than unity
– Completely unmanned - remote control from regional control centre
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McNeill Back-to-Back
• Refurbishment Drivers
– Obsolete Control System
– No Redundancy in Original Control System
• Issues
– Interfacing old thyristor valves with latest Control System hardware
– Extremely small control room
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McNeill Back-to-Back
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Conclusion • Refurbishment is customized according to:
– Drivers • Obsolete Components/Equipment • End of design life • Decreasing Reliability
– Alternatives • Controls Only • Valves, Cooling & Controls • Pole Replacement
– Issues • Interface / Technical • Commercial / business ….. Outage Constraints • Competition
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