Hvdc

1. A PRESENTATION ON
"HVDC TRANSMISSION"
SUBMITTED BY SOURAV MAITI
UNDER THE SUPERVISION OF SUDIPTA ACHARYA

2. INTRODUCTION:
➤ 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.

3. HVDC MEANS
➤HVDC stands for High Voltage Direct Current and is
today a well-proven technology all over the world.
➤ Two AC systems having different frequencies can be
linked up together by means of HVDC link.
➤ HVDC technology is used to transmit electricity over
long distances.

4. WHY DC TRANSMISSION?
➤ Losses are less in DC transmission while comparing
to AC transmission.
➤ Only two conductors are required for DC with positive
and negative polarities.
➤DC overhead lines or cables are less expensive.
➤DC lines are useful for long distances above 500km.

5. Comparison of HVAC and HVDC
★Conventionally power transmission is affected through
HVAC systems all over the world.
★HVAC transmission is having several limitations like,
line length, uncontrolled power flow, over/low voltages
during lightly / over loaded conditions, stability
problems, fault isolation etc...
★But HVDC have low transmission losses and it requires
only two conductors.

6. Comparison between the prices of AC & DC Transmission

7. HVDC Transmission System

8. Components of HVDC Transmission System
1. Converters
2. Smoothing reactors
3. Harmonic filters
4. Reactive power source
5. Electrodes
6. De lines
7. Ac circuit breakers

9. HVDC SYSTEM CONFIGURATION
HVDC Transmission can be broadly classified into:-
Monopolar link
Bipolar link
Homopolar link

10. 1.
2.
3.
4.
BASIC TRANSMISSIONS OF HVDC
Back to Back Transmission
Point to point Overhead line Transmission
Point to point Underground Cable Transmission
Point to point Sub marine Transmission.

11. DISADVANTAGES OF HVDC
• The disadvantages of HVDC are in conversion, switching,
control, availability and maintenance.
• There is nothing like DC transformer which can change the
voltage level in a simple way. Voltage transformation has to be
provided on the AC sides of the system.
• The required converter stations are expensive and have
limited overload capacity.

12. APPLICATIONS OF HVDC TRANSMISSION IN INDIA
➤ 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.
➤ The 1500 MW transmission chandrapur-padghe was put in
to service. it covers over distance of 736 km.

13. THANK YOU....