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HVDC Network as Infrastructure for Smart SAARC Power Grid
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Netra Gyawali, PhD(Associate Professor)
IOE, Pulchowk Campus, TU
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CONTENTS
• Background• Key Attributes of High Voltage Direct Current
(HVDC) Transmission• HVDC Transmission: Configuration and Modalities• HVDC Transmission: World Picture• HVDC Transmission: SAARC Context• HVDC Network in SAARC: Possibilities• Conclusions
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BACKGROUND
• Effective ( Functions as desired) Speed and accuracy
• Efficient (Low Loss)• Asset Management (Optimum use the asset)• Resilience• Interoperability • Accommodate Large Scale Renewable Power
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Requirement of Modern Transmission GRID
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KEY HVDC ATTRIBUTES
• No reactive lossesProvision for high cable lengthLower electrical losses
• Accommodate Renewable Power BTB connection Better Voltage Ride through Capability• The Power Flow on an HVDC link is Fully
Controllable (Fast and Accurate) The operator or automatic controller determines
how much power flows via the link and in which direction Irrespective of the interconnected AC system conditions
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KEY HVDC ATTRIBUTES
• An HVDC Link is asynchronous The ac voltage and frequency in the two ac networks can
be controlled independently of each other No need for common frequency control
• The HVDC link can be used to improve the dynamic conditions in both of the interconnected ac networks (power system damping) Can be controlled independently of AC system variations
• HVDC links do not increase the Short Circuit Level of the connected systems
• Faults and oscillations don’t transfer across HVDC interconnected systems Firewall against cascading outages
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KEY HVDC ATTRIBUTES
• HVDC can transport energy economically and efficiently over longer distances than ac lines or cables Increased Transmission Capacity in a fixed
corridor Up to 3 times more power per tower, therefore narrower rights of way
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KEY HVDC ATTRIBUTES
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KEY HVDC ATTRIBUTES
Source: IEEE Magazine 2008
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KEY HVDC ATTRIBUTES
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HVDC TRANSMISSION: CONCEPT
Source: IEEE Magazine 2008
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HVDC CONFIGURATIONS
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Natural Commutation Based HVDC•Thyristor or mercury-arc valves•Reactive power source needed•Large harmonic filters needed
HVDC TRANSMISSION: CONCEPT
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VSC Based HVDC• Natural Commutation
Based HVDC• IGBT valves• P and Q (or U) control• Can feed in passive
networks• Smaller footprint• Less filters needed
HVDC TRANSMISSION: CONCEPT
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HVDC TRANSMISSION: CONFIGURATION
Source: IEEE Magazine 2008
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Source: VG Rao 2005
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NORMAL POWER DIRECTIONNORMAL POWER DIRECTION
Source: VG Rao 2005
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REVERSE POWER OPERATION
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HVDC TRANSMISSION: WORKING
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HVDC TRANSMISSION: WORKING
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OVERVIEW OF HVDC APPLICATIONS
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HVDC TRANSMISSION: WORLD PICTURE
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Type submarine cable
Type of current HVDC
Total length 580 km (360 mi)
Power rating 700 MW
AC Voltage 300 kV (Feda), 400 kV (Eemshaven)
DC Voltage ±450 kV
HVDC TRANSMISSION: SOME EXAMPLES
Norway Netherland Line
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Commissioning year: 1997 (Sweden)
Power rating: 3 MW
No. of poles: 1
AC voltage: 10 kV (both ends)
DC voltage: ±10 kV
Length of DC overhead line: 10 km
Main reason for choosing HVDC Light:
Test transmission
HVDC TRANSMISSION: SOME EXAMPLES
The first HVDC Light transmission
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VSC HVDC example: troll (north sea)
• Commissioning year: 2005
• Power rating: 2 x 42 MW AC Voltage:132 kV at Kollsnes, 56 kV at Troll
• DC Voltage: +/- 60 kV
• DC Current: 350 A• Length of DC cable:4
x 70 km
Main reason for choosing HVDC Light:
Environment, long submarine cable distance, compactness of converter on platform
HVDC TRANSMISSION: SOME EXAMPLES
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BRAZIL ARGENTINA HVDC LINE
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HVDC TRANSMISSION PHILIPPINES
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HVDC TRANSMISSION: SOME EXAMPLES
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HVDC Network in SAARCHVDC Network in SAARC(BTB Link)(BTB Link)
ER
SR
NR
ER
SR HVDC LINK
CONNECTING REGION
CAPACITY
(MW)
Vindyachal
North – West
2 x 250
Chandrapur
West – South
2 x 500
Vizag – I East – South
500
Sasaram East – North 500
Source power grid India
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HVDC LINKS IN SAARC (INDIA)
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HVDC IN INDIA BIPOLAR
HVDC LINK CONNECTING REGION
CAPACITY (MW)
LINE LENGTH
Rihand – Dadri North-North 1500 815
Chandrapur - Padghe
West - West 1500 752
Talcher – Kolar East – South 2500 1367
Source power grid India
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SAARC HVDC LINK:POSSIBILITIES
India-Pakistan Nepal-India Srilanka-India Bangladesh-India Bhutan-India Afghan-Pakistan
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CONCLUSIONS
• HVDC transmission has number of benefits for bulk power transmission; namely efficiency, resilience, interoperability etc.
• In short distance, BTB HVDC provides smart link for frequency conversion and renewable power integration.
• In SAARC Country, the development of HVDC is only limited to India. For cross-border transmission link, HVDC is a good candidate.
• Combining with FACTS technology, HVDC provides a infrastructure of the future Smart Transmission Grid for SAARC.
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REFERENCES
• Understanding Facts: Concepts and Technology of Flexible AC Transmission Systems, Narain G. Hingorani, Laszlo Gyugyi
• Flexible AC transmission systems, Song & Johns
• Thyristor-based FACTS controllers for electrical transmission systems, Mathur Vama
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Thank you for your Attention
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