Double-pole operation method of high-voltage direct-current power transmission system in in-station grounding mode

Abstract

A double-pole operation method of a high-voltage direct-current power transmission system in an in-station grounding mode includes the steps of switching on a rectifying-side in-station high-speed ground switch and an inverting-side in-station high-speed ground switch; synchronously unlocking single valve units or double-valve units of a positive pole and a negative pole; adjusting a double-pole current difference to obtain equal double-pole currents; when the single valve unit or double valve unit of one pole is locked or emergently stopped, allowing the other pole to be locked or emergently stopped too; synchronously locking the single valve units or double valve units of the positive pole and the negative pole. The double-pole operation method has the advantages that the problem that failure of the ground pole in going into operation as scheduled leads to failure of direct-current double-pole operation due to external factors such as land acquisition and site selection is solved, double-pole unbalanced currents can be avoided, the current is avoided entering an in-station ground grid, and in-station equipment safety and personal safety are guaranteed.

Description

technical field [0001] The invention mainly relates to the technical field of high-voltage direct current transmission systems, in particular to a bipolar operation method of a grounding mode in a station of a high-voltage direct current transmission system. Background technique [0002] HVDC transmission has become an inevitable trend in the development of modern power systems. In the grid development strategy of "national networking, west-to-east power transmission, and north-south mutual supply", HVDC technology will play a leading role. In the HVDC transmission system, the grounding electrode is an important part, but in the actual construction process, due to external reasons such as land acquisition and site selection, the grounding electrode cannot be put into production as scheduled, which affects the smooth commissioning of the bipolar poles of the HVDC transmission system. Seriously hinder the economic and social benefits of power transmission, and the most conveni...

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Problems solved by technology

[0008] In order to overcome the defects in the above-mentioned prior art, the object of the present invention is to provide a bipolar operation method of the grounding mode in the station of the HVDC power transmission system. For the problem that it cannot be put into production on schedule and cannot realize DC bipolar operation, this method can ensure the synchronization of bipolar unlocking / blocking commands, and can ensure bipolar synchronous joint jump blocking or emergency shutdown, which can ensure that the bipolar heights are consistent and simultaneous release / Locking, and the differential current of the bipolar can be adjusted in time to ensure that the bipolar current is equal, avoiding unbalanced current entering the station, and ensuring the safety of equipment and personal safety in the station

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