HVDC TRANSMISSION pankajchaudhary582@gmail.com

1. A
SEMINAR ON
“HVDC TRANSMISSION”
BACHELOR OF TECHNOLOGY
IN
ELECTRICAL & ELECTRONICS ENGINEERING
SUBMITTED
BY
PANKAJ CHAUDHARY
R.N. - 24823
UNDER THE SUPERVISION OF
ARUNESH DUTT (H.O.D)
DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING
SANJAY GANDHI INSTITUTE OF ENGINEERING & TECHNOLOGY
NEHRU GRAM BHARATI UNIVERSITY, ALLAHABAD

2.  With the increasing of requirement of electrical power
supply the facilities have to be increased,in that
transmission plays an important role.
 Here hvdc (high voltage direct current) transmission
plays major role in power transmission.
 First hvdc transmission linked between gotland and
mainland in sweden in 1954.
 The hvdc transmission has many advantages over hvac
transmission.
HIGH VOLTAGE DIRECT CURRENT

3.  HVDC stands for high voltage direct current and
is today a well-proven technology all over the
world.
 Two a.c systems having different frequencies can
be linked up together by means of hvdc link.
 HVDC technology is used to transmit electricity
over long distances.
HIGH VOLTAGE DIRECT CURRENT

4.  Losses are less in d.c transmission while
comparing to a.c transmission.
 Only two conductors are required for d.c with
positive and negative polarities.
 D.C overhead lines or cables are less
expensive.
 D.C lines are useful for long distances above
500km.
?
HIGH VOLTAGE DIRECT CURRENT

5.  Converting transformers.
 Converter bridge.
 Surge arresters.
 Smoothing reactors.
 Filters(a.c and d.c).
HIGH VOLTAGE DIRECT CURRENT

6. THYRISTOR BASED HVDC SYSTEM VERSUS
HVAC SYSTEM:
 Costs for converter stations in hvdc is more than the
hvac substations.
 Operation maintanance costs
are less in hvdc transmission.
HIGH VOLTAGE DIRECT CURRENT
The figure shows
cost break down.

7.  HVDC lines occupies less place when compared to
a.c .
 D.C lines or cables are less expensive than a.c cables.
 Sychronisation of two a.c power supplies.
 HVDC does not transmit short circuit in case of faults
and disturbances.
 Power transmission can be done with out intermediate
taps.
HIGH VOLTAGE DIRECT CURRENT

8.  Long distances bulk power transmission.
 Under ground or under water cables.
 Asynchronous interconnection of two a.c power
supplies.
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9.  The difficulty of breaking d.c currents which results
in high cost of d.c currents.
 Inability to use transformers to change voltage
levels.
 High cost of conversion equipment.
 Complexity of control.
HIGH VOLTAGE DIRECT CURRENT

10.  Rihand-delhi and chandrapur-padghe were the first
long distance hvdc projects in India.
 In 1990 ,rihand-delhi (singrauli) thermal power
complex with a combined power generation of
Several thousand mw was put in to service.it covers
over a distance of 814 km.
 In 1998, the 1500 mw transmission chandrapur-padghe
was put in to service.it covers over distance
of 736 km.
HIGH VOLTAGE DIRECT CURRENT

11.  With the hvdc systems,the power flow can be
controlled rapidly and accurately as to both power
level and the direction.this possibility is often used
in order to improve the performance and efficiency
of connected a.c networks.
 Using hvdc to inter connect two points in a power
grid, in many cases is the best economic alternative,
and further more it has excellent environmental
benefits.
HIGH VOLTAGE DIRECT CURRENT

12.  The hvdc technology (high voltage direct current)
is used to transmit electricity over long distances
by overhead transmission lines or submarine
cables.
 HVDC overland links are usually bipolar, on
overhead lines. compared to ac, dc transmission
has several advantages.
HIGH VOLTAGE DIRECT CURRENT

13. 1.C.L.wadhwa ‘electrical power systems'-third
edition
2. I.J.nagrath and d.p.khotari 'power system
engineering
3. S.S. vadhera 'power system analysis and stability
4. Soni gupta bhatnagar 'power system engineering
5. K.R.padiyar ‘hvdc power transmission systems'
HIGH VOLTAGE DIRECT CURRENT