The Vizag back-to-back HVDC station, or Visakhapatnam back-to-back HVDC station, is a back-to-back
HVDC
A high-voltage direct current (HVDC) electric power transmission system uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. Most HVDC links use voltages betwe ...
connection between the eastern and southern regions in India, located close to the city of
Visakhapatnam
Visakhapatnam (; List of renamed places in India, formerly known as Vizagapatam, and also referred to as Vizag, Visakha, and Waltair) is the largest and most populous metropolitan city in the States and union territories of India, Indian stat ...
, and owned by
Power Grid Corporation of India
Power Grid Corporation of India Limited is an Indian central public sector undertaking under the ownership of the Ministry of Power, Government of India. It is engaged mainly in transmission of bulk power across different states of India. I ...
.
It consists of two independent poles, each with a nominal power transmission rating of 500 MW, referred to as Vizag 1 and Vizag 2.
Vizag 1 was built by
Alstom
Alstom SA () is a French multinational rolling stock manufacturer which operates worldwide in rail transport markets. It is active in the fields of passenger transportation, signaling, and locomotives, producing high-speed, suburban, regional ...
between 1996 and 1999 and has nominal DC voltage and current ratings of 205 kV, 2475 A. Its design is very similar to that of the
Chandrapur back-to-back HVDC converter station
The Chandrapur back-to-back HVDC station is a back-to-back HVDC connection between the western and southern regions in India, located close to the city of Chandrapur. Its main purpose is to export power from the Chandrapur Super Thermal Power S ...
.
Vizag 2 was built by
ABB
ABB Group is a Swedish-Swiss multinational electrical engineering corporation. Incorporated in Switzerland as ABB Ltd., and headquartered in Zurich, it is dual-listed on the Nasdaq Nordic exchange in Stockholm, Sweden, and the SIX Swiss Excha ...
between 2002 and 2005 and has nominal DC voltage and current ratings of 176 kV, 2841 A.
Both Vizag 1 and Vizag 2 use air-insulated, water-cooled thyristor valves.
On 31 December 2013, the Northern, Eastern and Western grids were synchronised with the Southern regional grid, creating a single synchronous AC grid over the whole of India.
One Nation – One Grid
Powergrid website (retrieved 18 November 2015). As a result, the converter station is no longer required for its original purpose of asynchronously linking the Eastern and Southern grids, although it can still be used as an embedded power flow device to help control power flow within the AC system. The stations could potentially be dismantled and moved to elsewhere to export/import power from other countries. Sometimes the excess power fed to the southern grid by this HVDC link is flowing back to Western region through the 765 KV AC lines between Southern grid and the Western grid which is not desired.
Sites
See also
* Chandrapur back-to-back HVDC converter station
The Chandrapur back-to-back HVDC station is a back-to-back HVDC connection between the western and southern regions in India, located close to the city of Chandrapur. Its main purpose is to export power from the Chandrapur Super Thermal Power S ...
* HVDC Sileru–Barsoor
The HVDC Sileru–Barsoor is a high voltage direct current transmission system between Sileru and Barsoor in India. It is in service since 1989 as the first HVDC line in the country. The HVDC Sileru–Barsoor is a bipolar HVDC with a voltage o ...
References
External links
Power Grid Corporation of India
Alstom Grid Website
ABB Group Website
Electric power transmission infrastructure in India
Economy of Visakhapatnam
Converter stations
Energy in Andhra Pradesh
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