[Legacy Report] Recent advances in HVDC technology
#Power
#system
#HVDC
#Technologies
High-voltage AC transmission has some limitations, starting with transmission capacity and distance constraints, and the impossibility of directly connecting two AC power networks of different frequencies. With the dawn of a new energy era and the need to build a smarter grid, HVDC is expected to grow far beyond its traditional position as a supplement to AC transmission.
HVDC is now the preferred choice for subsea electrical transmission and the interconnection of asynchronous AC grids, providing efficient, stable transmission and control capability. HVDC is also the technology of choice for long-distance bulk power transmission, able to send vast amounts of electricity over very long distances with low electrical losses. That makes it a key technology in overcoming a huge problem with renewable generation like wind, solar and hydro -- that these resources are seldom located near the population centers that need them.
The reasons for choosing HVDC instead of AC to transmit power in a specific case are often numerous and complex. Either HVDC is necessary or desirable from a technical point of view, i.e. controllability, or HVDC results in a lower total investment, including lower losses, and/or is environmentally superior. In many cases, HVDC links are justified based on a combination of technical, economic and environmental advantages.
After the first commercial HVDC transmission between Gotland and the mainland of Sweden in 1954, the whole HVDC technology has experienced a dramatic development. The continuous development of power electronics presents cost-effective opportunities for the utilities to fully exploit HVDC technology. VSC-HVDC can particularly address not only the conventional network issues such as bulkpowertransmission,asynchronousnetwork interconnections, back-to-back AC system linking and voltage/stability support to mention a few, but also niche markets such as the integration of large scale renewable energy sources with the grid.
This talk would focus on some of the recent advances in the area of HVDC technology.
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