Hybrid AC/DC system for electric power transmission

Details Hybrid AC/DC system for electric power transmission Hybrid AC/DC system for electric power transmission

2005-03-01

2005-03-01

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

For reactive power control

Using converter

Reexamination Certificate

active

06861825

ABSTRACT:
A systematic, time-varying current is applied to any number of transmission conductors while the voltage on each remains at an essentially constant level but periodically reversed in polarity. Variations in current, from high to low and from positive to negative, are timed to coordinate with the thermal time constant of the conductor or cable. Current is interrupted on each conductor for a short period around a zero value to allow reversal of voltage. This invention allows full thermal utilization of each conductor in the system while gaining the advantage afforded by sustained DC voltage.

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patent: 5420495 (1995-05-01), Hingorani
patent: 5952816 (1999-09-01), Larsen
patent: 5999388 (1999-12-01), Asplund
patent: 6255806 (2001-07-01), Seppanen et al.
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patent: 6552598 (2003-04-01), Gelman
patent: 6714427 (2004-03-01), Barthold
patent: 6804128 (2004-10-01), Barthold

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