High voltage direct current


Posted on Feb 7, 2014

Long distance HVDC lines carrying hydroelectricity from Canada`s Nelson river to this converter station where it is converted to AC for use in southern Manitoba `s grid A high-voltage, direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power, in contrast with the more common alterna


High voltage direct current
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ting current (AC) systems. [1] For long-distance transmission, HVDC systems may be less expensive and suffer lower electrical losses. For underwater power cables, HVDC avoids the heavy currents required to charge and discharge the cable capacitance each cycle. For shorter distances, the higher cost of DC conversion equipment compared to an AC system may still be warranted, due to other benefits of direct current links. HVDC allows power transmission between unsynchronized AC transmission systems. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances due to rapid changes in power. HVDC also allows transfer of power between grid systems running at different frequencies, such as 50Hz and 60Hz. This improves the stability and economy of each grid, by allowing exchange of power between incompatible networks. The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden ( ASEA ) and in Germany. Early commercial installations included one in the Soviet Union in 1951 between Moscow and Kashira, and a 100kV, 20MW system between Gotland and mainland Sweden in 1954. [2] The longest HVDC link in the world is currently the Xiangjiaba Shanghai 2, 071km (1, 287mi), ±800kV, 6400MW link connecting the Xiangjiaba Dam to Shanghai, in the People`s Republic of China. [3] Early in 2013, the longest...




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