| 摘要 |
A circuit topology for bipolar direct current power transmission between two alternating current electrical power systems (6), comprising two equally rated dc power transmission lines (4) of opposite polarity, each of whose opposed ends are interfaced to the alternating current electrical power systems through a bipolar converter (C) which is grounded at its dc neutral point through an earthing device (5<1>) comprising at least one reactive impedance to control converter-induced harmonic currents in stray components of the transmission lines. The reactive impedance 5<1> may be an inductor, tuned circuits of inductor and capacitor and resistor in parallel and a series connection of these tuned circuits. The converter may be series connected six pulse bridges for a HVDC link.
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