Rafael Bonchang HVDC Area Manager Alstom Grid EnglandKEPCO Returns to Alstom No. 2 Grid for supply...
Transcript of Rafael Bonchang HVDC Area Manager Alstom Grid EnglandKEPCO Returns to Alstom No. 2 Grid for supply...
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Rafael Bonchang HVDC Area Manager
Alstom GridEngland
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Agenda
WHAT IS HVDC
ULTRA HVDC
VSC : A NEW TECHNOLOGY
PROJECT EXAMPLES
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Why use HVDC?
• Transmission of bulk power where AC would be uneconomical
• Interconnection between systems which are non -synchronized or weak
• Improvement of AC system performance .
In many circumstances, it is economically and technically advantageous to introduce direct current (DC) links into the electrical supply syste m:
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Types of HVDC Configurations
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Basic HVDC Transmission
DC linkTransformer
F FHarmonic Filter
(Reactive Power )
ReceivingEnd
SendingEnd
Idc
Vdc
t
Idci
t
i
Iact
i
Iac
InverterRectifier
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Point to Point – Overhead Line
DC Line
InverterRectifier
F F
ReceivingEnd
SendingEnd
t
i
t
i
t
i
Bulk Transmission
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Point to Point – CableInverterRectifier
F F
ReceivingEnd
SendingEnd
t
i
t
i
t
i
Underwater or Underground
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Back to BackReceiving
EndSending
End InverterRectifier
F F
t
i
t
i
t
i
Frequency changingAsynchronous connection
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Why Use HVDC?
– Transmission >800km
– Submarine >50km– Frequency
conversion • 50-60Hz
– When synchronism of AC connections is impossible
Station Cost
DC
AC
Break EvenDistance
TransmissionDistance
The Perfect Tool
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Up to 3 Times More Power
1850MW 1850MVA 5550MW
More Power Per Tower
DC DCAC
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AC
DC
Charges and DischargesEvery Half Cycle
Only Charges the Cable Once
T7922
Power Transmission Via Cables
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Surviving a Black Out
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HVDC Price Trend
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0 100 200 300 400 500 600 700 800 9001000MW
Pric
e (p
u)
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Transmission Losses
0.2%
0.7%0.8%
0.0p.u 0.5p.u 1.0p.u0.0%
No-Load LossTransformer Converter Auxiliary
Load LossTransformerConverterFilter
Transmitted Power
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HVDC Valves
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Agenda
WHAT IS HVDC
ULTRA HVDC
VSC : A NEW TECHNOLOGY
PROJECT EXAMPLES
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UHVDC Prospects 600kV-800kV
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800 kV Valve
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Wall bushing technology
Alstom 820 kV DC gas wall bushing
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Agenda
WHAT IS HVDC
ULTRA HVDC
VSC : A NEW TECHNOLOGY
PROJECT EXAMPLES
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What is VSC Transmission
• VSC = Voltage Source Converter• Capacitor normally used as energy
storage• VSC uses Transistor instead of
Thyristor technology
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Comparison of Classical HVDC and VSC Transmission
ClassicHVDC VSC
Station Cost
Power Losses
Reliability / Availability
Control of Reactive Power
BLACK START
Footprint
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Comparison of Classical HVDC and VSC Transmission
ClassicHVDC
VSC
Proven Experience (Service Life)
Power Range
Long Distance Transmission
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Renewables conference, Manchester, Mar 2012
HVDC Off-shore Wind Farms
Off-shore wind farm
HVAC platform
HVDC platform
On-shore HVDC station
HVDC CABLE
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Renewables conference, Manchester, Mar 2012
DC Grid Configurations: In-shore Point-to-point System
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Renewables conference, Manchester, Mar 2012
DC Grid Configurations: Offshore Grid System
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Agenda
WHAT IS HVDC
ULTRA HVDC
VSC : A NEW TECHNOLOGY
PROJECT EXAMPLES
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South Korea - Cheju Island
• 400 MW, ±250 kVdc,
• 122 km submarine cable
• Completion 2013/2014Seoul
S. KOREA
Cheju Island
No. 1
No. 2KEPCO Returns to Alstom Grid for supply of a second,
larger HVDC project
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Creating a National Grid in India
• 1 Chandrapur– 2 x 500MW, W-S regions
• 2 Visakhapatnam– 1 x 500MW, E-S regions
• 3 Sasaram– 1 x 500MW, E-W regions
2000 MW supplied by Alstom Grid
3
21
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Middle East
• Interconnects– Saudi Arabia
380kV (60Hz)– Kuwait,
Bahrain, Qatar 400kV (50Hz)
• Rating : 3 x 600MW
• Ambient temperature 55°C
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South America : BtB project
• Melo – Uruguay• Interconnects
– 500kV 50Hz Uruguay
– 525kV 60Hz Brazil
• 500MW pole• Turn -key project -
31 months
Montevideo
BRASIL
URUGUAYMelo
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2 x 3150MW bi-poles
• ±600kV• 2375 km
Rio Madeira Project - Brazil
Rio Madeira
Sao Paulo
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Power: 2x720MWVoltage DC: +/-300kVdcDistance 200 km
Phase 1: Interconnection in Sweden
Phase 2:Sweden to Norway
EAOW 25 January 2012
Sweden - South West
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Champa India
• +/-800kV 3000MW Bipole
• 1300 km Line Between Champa and Kurukshetra
• Provision to include upgrade to 6000MW at a later date
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www.alstom.com