24-08-2012, 11:15 AM
ADVANCED HVDC TECHNOLOGIES
ADVANCED HVDC TECHNOLOGIES.doc (Size: 609 KB / Downloads: 43)
ABSTRACT:
In modern power systems network, it is essential to transmit power from one region to another region in order to meet the load demands. This can only possible by having Asynchronous power transmission between two regions operating at different frequency. This Asynchronous power transmission is called HVDC transmission.
Beginning with a brief historical perspective on the development of High Voltage Direct Current (HVDC) transmission systems, this paper presents an overview of the status of HVDC systems in the world today. It then reviews the underlying technology of HVDC systems, and HVDC systems from a design, construction, operation and maintenance points of view. The paper then discusses the recent developments in HVDC technologies. The paper also presents an economic and financial comparison of HVDC system with those of an AC system; and provides a brief review of reference installations of HVDC systems. The paper concludes with a brief set of guidelines for choosing HVDC systems in today’s electricity system development.
Maintenance:
Maintenance of HVDC systems is comparable to these of those of high voltage AC systems. The high voltage equipment in converter stations is comparable to the corresponding equipment in AC substations, and maintenance can be executed in the same way. Maintenance will focus on: AC and DC filters, smoothing reactors, wall bushings, valve- cooling equipment, thyristor valves. In all the above, adequate training and support is provided by the installation, commissioning and initial operation period.
Cost structure: The cost of an HVDC system depends on many factors, such as power capacity to be transmitted, type of transmission medium, environmental conditions and other safety, regulatory requirements etc.
Some successfully commissioned HVDC projects in India:
1) Rihand-Delhi HVDC Transmission:
National Thermal Power Corporation Limited built a 3000 MW coal-based thermal power station in the Sonebhadra District of Uttar Pradesh State. Part of the power from the Rihand complex is carried by the Rihand-Delhi HVDC transmission link, which has a rated capacity of 1500mw at + 500kv DC. Some of the power is transmitted via the existing parallel 400kv AC lines.
The basic aim of the HVDC link is to transmit the Rihnad power efficiently to the Northern Region,
meeting urgent needs in the area. There were several reasons why choosing HVDC instead of 400kv AC. The most important ones were better economics, halved right-of –way requirements, lower transmission losses and better stability and controllability. The Rihand-Delhi HVDC transmission is the first commercial long-distance HVDC link in India.
ADVANCED TECHNOLOGIES IN HVDC SYSTEMS:
The Electrical Power Research Institute (EPRI) continues to play a vital leadership role in the theoretical and experimental fronts in HVDC, AC/DC conversion equipment, and operation of HVDC systems. The EPRI High Voltage Laboratory in Lenox is a unique research and testing resource available to EPRI members. Lenox Laboratory has conducted pioneering research for a half a century, first under the direction of General Electrical and later a dedicated EPRI center.
HVDC work at the Lenox Laboratory was launched with the construction in 1977 of a full-scale DC test capability to +/- 1200kv and a DC source rated at +/- 1500kv. Several long –duration research projects were performed at the laboratory between 1977 and 1984 to investigate various aspects of HVDC line performance between +/- 600kv and +/- 1200kv. After 1984, emphasis shifted in response to market needs to the +/- 400kv and +/- 600kv voltage range.
Conclusion:
India has been a pioneer developer of HVDC since 1990 when the 1000 mw Rihand - Delhi line was commissioned in UP. Since then many 500 mw lines have come up. The 2000 mw Talcher - Kolar link is the biggest so far and spans four states: Orissa, Andhra Pradesh, Tamil Nadu and Karnataka. The project cost Rs.700 crores and was executed by Indians. The commissioning of the 200 MW, 200 KV National HVDC project has linked the 196 km. DC transmission line between Barsoor in Chhatisgarh and Lower Sileru in Andhra Pradesh.These facts should give us a measure of the little-known developmental works of very high calibre that are going on in India right now. We should be justly proud of this achievement
ADVANCED HVDC TECHNOLOGIES.doc (Size: 609 KB / Downloads: 43)
ABSTRACT:
In modern power systems network, it is essential to transmit power from one region to another region in order to meet the load demands. This can only possible by having Asynchronous power transmission between two regions operating at different frequency. This Asynchronous power transmission is called HVDC transmission.
Beginning with a brief historical perspective on the development of High Voltage Direct Current (HVDC) transmission systems, this paper presents an overview of the status of HVDC systems in the world today. It then reviews the underlying technology of HVDC systems, and HVDC systems from a design, construction, operation and maintenance points of view. The paper then discusses the recent developments in HVDC technologies. The paper also presents an economic and financial comparison of HVDC system with those of an AC system; and provides a brief review of reference installations of HVDC systems. The paper concludes with a brief set of guidelines for choosing HVDC systems in today’s electricity system development.
Maintenance:
Maintenance of HVDC systems is comparable to these of those of high voltage AC systems. The high voltage equipment in converter stations is comparable to the corresponding equipment in AC substations, and maintenance can be executed in the same way. Maintenance will focus on: AC and DC filters, smoothing reactors, wall bushings, valve- cooling equipment, thyristor valves. In all the above, adequate training and support is provided by the installation, commissioning and initial operation period.
Cost structure: The cost of an HVDC system depends on many factors, such as power capacity to be transmitted, type of transmission medium, environmental conditions and other safety, regulatory requirements etc.
Some successfully commissioned HVDC projects in India:
1) Rihand-Delhi HVDC Transmission:
National Thermal Power Corporation Limited built a 3000 MW coal-based thermal power station in the Sonebhadra District of Uttar Pradesh State. Part of the power from the Rihand complex is carried by the Rihand-Delhi HVDC transmission link, which has a rated capacity of 1500mw at + 500kv DC. Some of the power is transmitted via the existing parallel 400kv AC lines.
The basic aim of the HVDC link is to transmit the Rihnad power efficiently to the Northern Region,
meeting urgent needs in the area. There were several reasons why choosing HVDC instead of 400kv AC. The most important ones were better economics, halved right-of –way requirements, lower transmission losses and better stability and controllability. The Rihand-Delhi HVDC transmission is the first commercial long-distance HVDC link in India.
ADVANCED TECHNOLOGIES IN HVDC SYSTEMS:
The Electrical Power Research Institute (EPRI) continues to play a vital leadership role in the theoretical and experimental fronts in HVDC, AC/DC conversion equipment, and operation of HVDC systems. The EPRI High Voltage Laboratory in Lenox is a unique research and testing resource available to EPRI members. Lenox Laboratory has conducted pioneering research for a half a century, first under the direction of General Electrical and later a dedicated EPRI center.
HVDC work at the Lenox Laboratory was launched with the construction in 1977 of a full-scale DC test capability to +/- 1200kv and a DC source rated at +/- 1500kv. Several long –duration research projects were performed at the laboratory between 1977 and 1984 to investigate various aspects of HVDC line performance between +/- 600kv and +/- 1200kv. After 1984, emphasis shifted in response to market needs to the +/- 400kv and +/- 600kv voltage range.
Conclusion:
India has been a pioneer developer of HVDC since 1990 when the 1000 mw Rihand - Delhi line was commissioned in UP. Since then many 500 mw lines have come up. The 2000 mw Talcher - Kolar link is the biggest so far and spans four states: Orissa, Andhra Pradesh, Tamil Nadu and Karnataka. The project cost Rs.700 crores and was executed by Indians. The commissioning of the 200 MW, 200 KV National HVDC project has linked the 196 km. DC transmission line between Barsoor in Chhatisgarh and Lower Sileru in Andhra Pradesh.These facts should give us a measure of the little-known developmental works of very high calibre that are going on in India right now. We should be justly proud of this achievement