Switching control method and device for converting metal loop to ground loop, terminal and medium

Abstract

The invention provides a switching control method and device for converting a metal loop to a ground loop, a terminal and a medium. The method comprises the steps that: a first current value of the ground loop of a to-be-switched converter station is detected in response to the closing of an MRTB switch of the to-be-switched converter station; and the duration that the first current value is not greater than a preset ERTB switch-off threshold value is calculated, and when the duration exceeds a preset duration threshold value, the first current value is adjusted by adjusting the output of theconverter station of a multi-terminal DC power transmission system, so that the adjusted first current value is greater than the ERTB switch-off threshold value. According to the method of the invention, after the ERTB switch of the to-be-switched converter station is closed, when it is detected that the first current value flowing through the metal loop does not meet a switching condition, the first current value is adjusted to meet the switching condition, and a switching action is completed; and therefore, the technical problem that the converter station of an existing multi-terminal direct-current power transmission system is prone to falling into a ground / metal double-loop coexistence state in a metal loop conversion process is solved.

Description

technical field [0001] The present application relates to the technical field of multi-terminal direct current transmission, and in particular to a switching control method, device, terminal and medium for converting a metal return line to a ground return line. Background technique [0002] With the increase of power demand and the advancement of DC transmission technology, compared with the conventional two-terminal DC transmission system, the multi-terminal DC transmission system including three or more converter stations has stronger transmission capacity and can better It has great potential to adapt to the current and future power environment. [0003] For the multi-terminal DC transmission system with bipolar structure, there are generally two operating modes of earth return line and metal return line operation during unipolar operation. In order to meet the needs of operation, it is necessary to switch between the two operating modes to figure 1 The three-terminal sy...

AI Technical Summary

Problems solved by technology

[0005] The present application provides a switching control method, device, terminal and medium for converting a metal return line to a ground return line, which are used to solve the problem that the converter station of the existing multi-terminal direct current transmission system is likely to fall into the ground metal double circuit during the process of converting the metal return line. Technical Problems in the Coexistence of Lines and Lines

Images