Advantages of HVDC transmissions

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Advantages of HVDC transmissions

  1.  A lesser number of conductors and insulators are required thereby reducing the cost of the overall system.
  2. It requires less phase to phase and ground to ground clearance.
  3. Their towers are less costly and cheaper.
  4. Lesser corona loss is less as compared to HVAC transmission lines of similar power.
  5. Power loss is reduced with DC because fewer numbers of lines are required for power transmission.
  6. The HVDC system uses earth return. If any fault occurs in one pole, the other pole with ‘earth returns’ behaves like an independent circuit. This results in a more flexible system.
  7. The HVDC has the asynchronous connection between two AC stations connected through an HVDC link; i.e., the transmission of power is independent of sending frequencies to receiving end frequencies. Hence, it interconnects two substations with different frequencies.
  8. Due to the absence of frequency in the HVDC line, losses like skin effect and proximity effect does not occur in the system.
  9. It does not generate or absorb any reactive power. So, there is no need for reactive power compensation.
  10. The very accurate and lossless power flows through DC link.

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