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Induction Motor Interview Questions with Answers | Part-1

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HVDC Transmission System | Advantages of HVDC System | Disadvantages of System | Application Of HVDC System

HVDC Transmission System | Advantages of HVDC System | Disadvantages of System | Application Of HVDC System


Advantages of HVDC Transmission System:


All the advantages are mentioned below:

✓ Only two conductors are used for transmission, hence cost of transmission is
less.

Hvdc Transmission system
HVDC Transmission System | Advantages of HVDC System | Disadvantages of System | Application Of HVDC System


✓ Losses of transmission are reduced since there is no reactive power.


✓ Due to high voltage transmission,current is less for same power. Hence IR loss is very small.


✓ Due to DC transmission, there is no skin effect. Hence thin conductors can be used. But in AC transmission, the conductors must be thick to take care of skin effect.


✓ HVAC induces body currents in the vicinity of the conductors.This is absent in HVDC.


✓ Two ac systems of different frequencies can be connected through HVDC system. This is not possible in HVAC.


✓ HVDC uses electronic converters.Hence protections can be implemented faster than HVAC.


✓ HVDC do not have any dielectric loss heating problems in an insulation of conductors.


✓ HVDC have minimum audible noise,radio and TV interference.


✓ Power levels on HVDC can be electronically controlled in case of faults.


✓ DC cables are cheaper than ac cables used for transmission.


✓ Due to bipolar transmission,the voltage levels are balanced with respect to an earth.


✓ Line charging and electric resonance effects are absent in HVDC.


Disadvantages of HVDC Transmission:


✓ The cost of converters is high.


✓ Converters control is quite complex.


✓ Additional filters are required that increases the cost.


Comparison between HVAC and HVDC Transmissions:


Comparison point 1:


Type of Transmission:


HVAC : AC transmission
HVDC : DC transmission


Comparison point 2:


Overall losses

HVAC: High
HVDC: Low


Comparison point: 3


Cost of transmission

HVAC: High
HVDC: Low


Comparison point 4:


Cost of equipment


HVAC: Low
HVDC: High


Comparison point 5:


Power control


HVAC: Power cannot be controlled
HVDC: Power can be controlled


Comparison point 6:


Directionality of link


HVAC: Unidirectional
HVDC: Bidirectional


Comparison point 7:


Transmitted power and distance


HVAC: Depends upon distance.
HVDC: Independent of distance.


Applications of HVDC Transmission


HVDC Transmission has  following applications which is mentioned below:

✓ Underground and underwater cables.

✓ Long distance bulk power transmission.

✓ Asynchronous interconnection of AC systems

✓ Power flow stabilization in integrated power system.


May You like to read this article related to electical engineering 👇

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