22-06-2013, 04:33 PM
A SEMINAR ON HVDC TRANSMISSION SYSTEM & TECHNOLOGY
HVDC.ppt (Size: 2.64 MB / Downloads: 49)
INTRODUCTION
What is HVDC?
The HVDC technology is used to transmit large amount of power over long distances by overhead transmission lines or submarine cables . It is also used to interconnect separate power systems, where traditional alternating current (AC) connections can not be used.
Why we need HVDC ?
Now a days large blocks of power are needed to be transmitted.
There arises some technical problems of transmitting power to such a long distance using ac.
In the view of the draw backs of ac the HVDC transmission has come into picture.
Technical Advantages
Reactive power requirement.
System stability.
Short Circuit Current.
Independent Control of ac system.
Fast change of energy flow.
Lesser Corona Loss and Radio interference.
Greater Reliability.
CONCLUSION
Recent studies indicate that HVDC systems are very reliable.
The data collected from 31 utilities says that forced unavailability of energy due to the converter station is 1.62%
The scheduled unavailability of energy is about 5.39%.