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High-voltage_direct_current abstract "A high-voltage, direct current (HVDC) electric power transmission system (also called a power super highway or an electrical super highway) uses direct current for the bulk transmission of electrical power, in contrast with the more common alternating current (AC) systems. 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 justified, 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 50 Hz and 60 Hz. 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 100 kV, 20 MW system between Gotland and mainland Sweden in 1954. The longest HVDC link in the world is the Rio Madeira link in Brazil, which consists of two bipoles of ±600 kV, 3150 MW each, connecting Porto Velho in the state of Rondônia to the São Paulo area. The length of the DC line is 2,375 km (1,476 mi).".
High-voltage_direct_current thumbnail Nelson_River_Bipoles_1_and_2_Terminus_at_Rosser.jpg?width=300.
High-voltage_direct_current wikiPageExternalLink HVDC_Solutions_EPRI_Conference_09-07_V_1b.pdf.
High-voltage_direct_current wikiPageExternalLink Other-Documents.
High-voltage_direct_current wikiPageExternalLink technology_abb.pdf.
High-voltage_direct_current wikiPageExternalLink hvdc.
High-voltage_direct_current wikiPageExternalLink hvdc-transmission-systems.
High-voltage_direct_current wikiPageExternalLink hvdc_interconnections.aspx.
High-voltage_direct_current wikiPageExternalLink www.hvdc-plus.de.
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High-voltage_direct_current wikiPageWikiLink International_Council_on_Large_Electric_Systems.
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High-voltage_direct_current wikiPageWikiLink List_of_HVDC_projects.