Advantages, Disadvantages, Limitations Of High Voltage DC System

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Advantages of High Voltage DC System

The advantages of a high voltage DC system over high voltage alternating current are:-

  1. For the flow of power in the HVDC system. Requires less driver as compared to the HVAC system.
  2. An HVDC overhead line costs 1/3 times less than an HVAC overhead line for the same capacity.
  3. In an HVAC system, the cost increases with increasing line distance, whereas in an HVDC system, it does not.
  4. In high voltage DC transmission, the write off-way is less than the high voltage alternating current.
  5. The natural di-electric strength of cables in HVDC systems is much higher than in HVAC systems.
  6. High voltage DV line requires less space than high voltage AC.
  7. If used to transmit HVDC power, a single high voltage cable can send three times more energy than HVAC.

Disadvantages of High Voltage DC Transmission (HVDC) System:-

Drawbacks of High Voltage DC Transmission or Disadvantages of HVDC System:-

  1. Circuit breaking in a multiterminal DC system is expensive and difficult.
  2. Harmonic generation and filtration are essential.
  3. A potential transformer is required on the AC side.
  4. The maintenance of the insulator is very high.
  5. The overload capacity of the HVDC converter is low.
  6. Converter stations require reactance power which is normally supplied externally to the load. It does not occur in HVDC.
  7. Communication over a distance of less than 500 km is expensive due to the need for converters, filters, compensators, etc.

Limitations of High Voltage DC Transmission

The following are the limits of high voltage DC transmission:-

  1. Due to the harmonics produced in the converter operation, a non-sinusoidal current flows in the converter transformer, causing interference in the audio frequency of the telephone line, so both the AC and DC sides are used to reduce the harmonic. Filters are used in.
  2. Static VAR compensation is required.
  3. There is complexity in controlling.
  4. Conversion equipment costs more.
  5. The voltage level through the transformer is unable to change.
  6. In the HVDC line, more arrangement of insulator has to be made.
  7. Voltage transfer is done on AC.

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