A symmetrical bipolar dc transmission system

Abstract

The present application relates to the technical field of electric power engineering, and discloses a symmetrical bipolar DC sending-out system, which comprises: an offshore station electrical main wiring topology AC side connected with two AC incoming lines, the first positive pole and the second negative pole DC end of which are respectively connected with the first positive pole and the second negative pole DC end of the onshore station electrical main wiring topology, and the first negative pole and the second positive pole DC end of the offshore station are interconnected and grounded through a first metal return line; the first negative pole and the second positive pole DC end of the onshore station electrical main wiring topology are interconnected and grounded through a second metal return line, and the AC side thereof is connected with a first AC outgoing line, and the two form a symmetrical bipolar DC transmission loop through the above connection. The second AC side of the onshore station electrical main wiring topology is connected with a second AC outgoing line to construct a three-wire symmetrical bipolar DC transmission topology, and the inter-pole is formed in a symmetrical bipolar operation mode through a metal return line, and the bipolar DC system can be independently controlled, and the defect of low operation reliability of the traditional pseudo-bipolar system is avoided from the topology level.

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