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Presented byPresented by
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The HVDC LIGHT is a technology based
on voltage sources converters (VSC s)
which emphasizing the light weight andcompactness features
intrinsic to it as
well as competitiveness in application in
the low end of the power scale.
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HVDC light technology is designed to transmitlarge quantities of
power using undergroundcables and at the same time adds stability
andpower quality to the connected networks.These converter stations
are compact and by
virtue of their control they do not contribute tothe short
circuit levels.They can meet the demands of competitivepower market
for transmission up to 1100MW.
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Recent development efforts intransmission technology have
focused oncompact, small weight and cost-effective.By combining the
advances made in VSCand DC cables, a new breed of
electricitytransmission and distribution technologyemerges the HVDC
light.
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The land cables can be installed less costly with
plowingtechnique.
The submarine cables can be laid in deeper waters and
on rough sea beds.
HVDC cables can also be installed as overhead cables.
Plastic cable Mass impregnated oil cable
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The key part of the HVDC light converter
consists of an IGBT valve bridge.
HVDC light uses Pulse Width Modulation togenerate the
fundamental voltage.
It controls the magnitude and phase of the
voltage freely and allows independent and
very fast control of active and reactive powerflows.
PWM voltage source converter does not
contribute to the short-circuit power, as the AC
current can be controlled by the converter
valve.
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Simplified HVDC light circuit Single line diagram of
conventional HVDC
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Delivery of electricity to ISLANDS
Feeding electric power to large and rapid
growing cities.
Feeding electric power to remotely located
loads.
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Magnetic fields are eliminated sinceHVDC light cables are laid
in pairs withDC current in opposite directions.
It offers no overhead lines, neutralelectromagnetic fields,
oil-free cablesand compact converter stations.The cable insulation
is power electronicbased are not dangerous.
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The main advantages of this new technology
are short lead times, cost effectiveness,
compactness and environmental friendliness.
It is anticipated that this technology willquickly become the
preferred alternative for
transportation of energy, in many application
cases where electricity transmission was not
considered previously
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