Transcript hvdc Light Technology

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The HVDC LIGHT is a technology based
on voltage sources converters (VSC’ s)
which emphasizing the light weight and
compactness features intrinsic to it as
well as competitiveness in application in
the low end of the power scale.
HVDC light technology is designed to transmit
large quantities of power using underground
cables and at the same time adds stability and
power quality to the connected networks.
These converter stations are compact and by
virtue of their control they do not contribute to
the short circuit levels.
They can meet the demands of competitive
power market for transmission up to 1100MW.
Recent development efforts in
transmission technology have focused on
compact, small weight and cost-effective.
By combining the advances made in VSC
and DC cables, a new breed of electricity
transmission and distribution technology
emerges the “HVDC light”.
The land cables can be installed less costly with plowing
technique.
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
Conventional HVDC converter technology is
based on the use of line-commutated or phasecommutated converters (PCC) with
high frequency switching of IGBT’s and power
full thyristors.
IGBT valve
Thyristor valve
The key part of the HVDC light converter
consists of an IGBT valve bridge.
HVDC light uses Pulse Width Modulation to
generate the fundamental voltage.
It controls the magnitude and phase of the
voltage freely and allows independent and
very fast control of active and reactive power
flows.
PWM voltage source converter does not
contribute to the short-circuit power, as the AC
current can be controlled by the converter
valve.
Simplified HVDC light circuit
Single line diagram of
conventional HVDC
Delivery of electricity to ISLANDS
Feeding electric power to large and rapid
growing cities.
Feeding electric power to remotely located
loads.
Magnetic fields are eliminated since
HVDC light cables are laid in pairs with
DC current in opposite directions.
It offers no overhead lines, neutral
electromagnetic fields, oil-free cables
and compact converter stations.
The cable insulation is power electronic
based are not dangerous.
The main advantages of this new technology
are short lead times, cost effectiveness,
compactness and environmental friendliness.
It is anticipated that this technology will
quickly become the preferred alternative for
transportation of energy, in many application
cases where electricity transmission was not
considered previously