The ±800 kV North-East Agra UHVDC link will have a record 8,000 MW converter capacity, including a 2,000 MW redundancy, to transmit clean hydroelectric power from the North-Eastern and Eastern region of India to the city of Agra across a distance of 1,728 kilometers.
ABB has been selected by Powergrid Corporation of India Ltd. to deliver the world’s first multi-terminal UHVDC transmission link, worth $ 900 million. The link is called the ±800 kV, 6,000 MW HVDC Multi Terminal NER/ER - NR/WR Interconnector – I Project (NEA800 in short and also known as North East - Agra HVDC). The link comprises four terminals located at three converter stations with a 33% continuous overload rating and the power transmission system will thus have the possibility to convert 8,000 MW – which is the largest HVDC transmission ever built.
ABB will execute the project together with its partner Bharat Heavy Electricals Ltd. (BHEL), who will deliver the remainder of the contract, which is worth more than $1.1 billion in total. The partners have a turnkey responsibility for execution, including system engineering, design, supply and installation of three HVDC converter stations. The first stage of the system is scheduled to be operational in 2014 and the second stage in 2015.
The North Eastern region of India has an abundance of hydro power resources, approximately 65 000 MW. The resources are scattered over a large area, whereas load centers are located several hundreds and even thousands of kilometers away. The power has to pass through the so called "chicken neck area"; a very narrow patch of land (22 km width x 18 km of length) in the state of West Bengal having borders with Nepal on one side and Bangladesh on the other side.
Taj Mahal, Agra
One converter station will be located at Biswanath Chariali in the state of Assam in North Eastern region and a second near Alipurduar in the state of West Bengal in Eastern region. At the other end of the DC line which will terminate at Agra, there will be two bipolar converters connected in parallel. (See diagram below.) The 800 kV equipment yard at Agra will, for the first time, be placed indoors.
This is the second multi-terminal HVDC link build by ABB. Already in 1990-1992 a large scale three terminal transmission link was constructed in North America, the Québec - New England HVDC Transmission
- the first of its kind in the world.
|Commissioning year: || 2015|
|Power rating: ||6 000 MW (multiterminal)|
|No. of poles:||Converter: 4|
|AC voltage:||400 kV (all stations)|
|DC voltage:||±800 kV |
|Length of overhead DC line:||1 728 km |
|Main reason for choosing HVDC:||Long distance, bulk power|
|Application:||Connecting remote generation|