2. What is HVDC LIGHT?
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.
3. Introduction
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.
5. Evolution of “HVDC light”
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”.
6. Installation of HVDC cables
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
7. HVDC light converter
technology
Conventional HVDC converter technology is
based on the use of line-commutated or phase-
commutated converters (PCC) with
high frequency switching of IGBT’s and power
full thyristors.
IGBT valve Thyristor valve
9. 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.
10. Main difference between HVDC
light and conventional
Simplified HVDC light circuit
Single line diagram of
conventional HVDC
11. Applications of HVDC light
Delivery of electricity to ISLANDS
Feeding electric power to large and rapid
growing cities.
Feeding electric power to remotely located
loads.
12. Environmental considerations
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.
13. Conclusion
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
