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PRESENTED BY

HARSH BALDEV &

NARESH BALAJI

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CONTENTS

y What is HVDC transmission system?

y History behind HVDC transmission.

y Why have HVDC solutions become more desirable?

y HVDC links in the world.

y Worlds longest HVDC link.

y HVDC installations in India.

y Cost structure of HVDC transmission systems.

y Components of HVDC transmission system.

y

Corona discharge in HVDC systems.y Future of HVDC in India.

y Recently completed Indian HVDC projects.

y Advantages and disadvantages of HVDC systems.

y Applications of HVDC .

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What is HVDCtransmission system?

HVDC TransmissionSystem stands forHighVoltageDirectCurrentTransmission

System.HVDC transmissionsystemsare basically

usedtotransmit DC power.

Theyarecapable oftransmitting DC power

athighvoltagesand over longdistances.

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HISTORY BEHIND HVDC

TRANSMISSION

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WHY HAVE HVDC SYSTEMS

BECOME MORE DESIRABLE?yEnvironmental advantagesy

EconomicalyAsynchronous connectionsyPower flow control

yHighly stableyGood power quality

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HVDC LINKS IN THE WORLD

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LINK

The longest HVDClink in the world is

the Inga-Shaba link.It connects Inga dam

to Shaba copper mine.

It is 1700 km long.

It has a capacity of600MW.

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HVDC INSTALLATIONS IN INDIA

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COMPONENTSOFHVDCSYSTEM

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COMPONENTS OF HVDC SYSTEM

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HVDC CABLE

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CORONA DISCHARGE IN HVDC

y Corona is the ionization of airsurrounding the conductor by the

presence of a strong electric field.

y Due to this , either the positive ions or

electrons are attracted to the conductor.y This effect causes considerable power

losses.

y Both AC and DC transmission linescan generate corona.

y As corona is initiated, a hissing noise isheard and ozone gas Is formed which can bedetected by its characteristic odour.

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FUTURE OF HVDC IN INDIA

HVDC has taken INDIAselectricity industry by storm.

India is one of those few countries

having a large number of HVDCschemes in operation.

The HVDC links which are in

progress include

I. Bishwanath to Agra

II. Madurai,India toAnuradhapura,Sri Lanka

III. Mundra,Gujarat to Haryana.

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RECENTLY COMPLETED HVDC

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ADVANTAGES OF HVDC

TRANSMISSION SYSTEMy No limits in transmitted distance.

y Direction of power flow can be changed

quickly.y Lesser corona loss compared to HVAC.

y HVDC transmissions have a highavailability and reliability rate.

y Highly economical since extra

compensating materials are not required.y HVDC can carry more power for given

size of conductor.

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DISADVANTAGES OF HVDC

y InHVDC, conversion, switching, control ,availabilityandmaintenancearethemostproblematicareas.

y Expensivestatic invertersarerequired.y Forsmallertransmissiondistances , losses in static inverters may

bebiggerthanACtransmission.

y Circuitbreaking isdifficult.

yVoltagetransformation isdifficult.

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QUERIES.???????

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THANKYOU