HVDC transmission is a system that converts alternating current (AC) to direct current (DC) for long-distance power transmission and then back to AC at the receiving end, using conversion devices like rectifiers and inverters. It includes various types of links (monopolar, bipolar, and homopolar), each with unique characteristics and applications. The system offers advantages such as reduced conductor requirements and costs but also has disadvantages including high installation costs for conversion substations and harmonics generated during the conversion process.

1. HVDC
TRANSMISSION
PRESENTED BY
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AllumiaX.com

2. What is
HVDC
System?
HVDC Transmission system is the combination AC
and DC system, first the generated AC voltage is
converted into DC at the transmission end, when it
reaches the receiving end DC is inverted to AC for
distribution purposes. So, in order to carry out this
operating, we need conversion devices at both
ends of transmission line.
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3. Components
of
HVDC
System
Rectifier
Inverter
Converter
Electrodes
Smoothing Reactors
DC Lines
Harmonic Filters
Reactive Power Supplies
AC Circuit Breaker
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4. How does HVDC
Transmission
System Work?
In generating substation, AC
power is generated, which is
converted into DC using a rectifier.
The DC flows through the
overhead line, and then again at
the user end, DC is converted into
AC using inverters and then AC is
supplied to the load. Rectifiers and
inverters are placed inside the
converter stations at the sending
and receiving ends.
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5. Mono means '1', so It has only
one conductor of negative
polarity
Operation with negative
polarity with respect to the
ground reduces the corona loss
Monopolar HVDC links were
used only for low power rating
and mainly for cable
transmission
Monopolar Link
1.
HVDC Links
Types
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6. Bi means '2', so bipolar link has
two conductors one is positive,
and one is negative to the
earth
If any of the bipolar links stops
working, the link automatically
converts to monopolar mode
because of the ground return
system; as a result, half of the
system continues to supply the
power
Bipolar link is widely used in
long-distance HVDC
transmission
HVDC Links
Types
2.Bipolar Link
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7. A homopolar link consists of
two conductors of the same
polarity usually negative
As the poles in this link are
operated in parallel, it reduces
the installation cost.
This type of link has limited
applications and is very
complicated. Thus it is not
currently used.
HVDC Links
Types
3.Homopolar Link
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8. © 2021 by AllumiaX, LLC. All rights Reserved.
Advantages &
Disadvantages
of
HVDC
Transmissions
ADVANTAGES:
This transmission requires fewer conductors and
insulators, thus reduces the cost of the overall
system
It requires less phase to phase and ground to
ground clearance
DISADVANTAGES
Due to installation of converter substation at both
the ends, conversion from AC to DC and vice versa
becomes quite expensive
Harmonics are produced by rectifiers and inverters
which are reduced by using active filters, hence
cost of system is increased
Read more Advantages & Disadvantages
at: bit.ly/HVDC-TRANSMISSION
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9. Read More at:
bit.ly/HVDC-TRANSMISSION
© 2021 by AllumiaX, LLC. All rights Reserved.