HVDC-LIGHT Technology

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HVDC-LIGHT Technology
Presented by
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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.

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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.

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Control scheme of HVDC light
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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.

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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
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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 IGBTs and power
  full thyristors.

IGBT valve
Thyristor valve
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HVDC light converter
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• 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.

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Main difference between HVDC light and
conventional
Single line diagram of conventional HVDC
Simplified HVDC light circuit
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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.

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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.

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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

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