Switching control method and device for converting ground loop into metal loop, terminal and medium
A technology of earth return line and control method, applied in the direction of power transmission AC network, etc., can solve the problems of coexistence state, easy to fall into the earth metal double return line, etc.
Active Publication Date: 2020-07-14
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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[0005] The present application provides a switching control method, device, terminal and medium for converting the earth return line to the metal return line, which are used to solve the problem that the converter station of the existing multi-terminal direct current transmission system is easy to fall into the earth metal return line in the process of converting the metal return line. Technical Problems in the Coexistence of Lines and Lines
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[0032] For the multi-terminal DC transmission system with bipolar structure, when the unipolar operation is performed, there are generally two operating modes: the earth return line and the metal return line. figure 1 The three-terminal system shown is taken as an example. Usually, the two converter stations need to be equipped with an earth return transfer breaker (ERTB) and a metal return transfer breaker (MRTB) to complete the earth return transfer breaker. The specific conversion method is to close the ERTB of each converter station one by one, and then disconnect the MRTB switch when the current flowing through the metal return line reaches the preset requirement, so that the conversion station is completed and the earth-to-earth transfer to the metal return line is completed. process of line operation.
[0033] by figure 1 The system shown is taken as an example. When the three-terminal system is in normal operation, the power transmission direction is that station 1 tr...
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The invention provides a switching control method and device for converting a multi-terminal direct current system from a ground loop to a metal loop, a terminal and a medium. The method comprises thesteps that: the first current value of the metal loop of a to-be-switched converter station is detected in response to the closing of the ERTB switch of the to-be-switched converter station; and whenthe first current value is not greater than a preset MRTB switch-off threshold, the first current value is adjusted by adjusting the output of the converter station of a multi-terminal DC power transmission system, so that the adjusted first current value is greater than the MRTB switch-off threshold. According to the method of the invention, after the ERTB switch of the to-be-switched converterstation is closed, the first current value of the metal loop of the to-be-switched converter station is detected; 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 the technical problem that the convertor 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 earth loop to metal loop. 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 system shown is taken as an exam...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 陈怡静黄伟煌刘涛李岩
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD