A method for inputting lines into a DC network in a multi-terminal flexible DC transmission system
A technology of direct current transmission system and direct current line, which is applied in the field of electric power system, can solve the problems such as the inability to put in live electricity, the impact of AC and DC systems, etc., and achieve the effect of putting in live electricity
Active Publication Date: 2019-02-01
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology
[0005] The purpose of the present invention is to provide a method for inputting a line into a DC network in a multi-terminal flexible direct current transmission system. When re-commissioning the DC network operation, the input line will have an impact on the AC and DC system, resulting in the problem that it cannot be powered on
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[0031] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] The flow chart of a specific embodiment of the method for putting lines into the DC network in the multi-terminal flexible DC transmission system provided by the present invention is as follows figure 1 As shown, the method includes:
[0033] Step S101: determining a non-operating converter station connected to the DC line to be put into operation;
[0034] Step S102: closing the switching device betw...
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The invention discloses a method of inputting a line into a DC network in a multi-end flexible DC power transmission system. The method comprises the steps of determining a converter station which is connected with a to-be-input DC line and is in a non-operation state; switching on a switch device between the to-be-input DC line and the converter station so that the converter station and the to-be-input DC line and the to-be-input DC line are started and unlocked; determining whether the DC voltage of the converter station is stable; when the DC voltage of the converter station is stable, switching off the converter station and switching on the switch device at the opposite side of the to-be-input DC line; and switching on the converter station, thereby finishing inputting of the DC line. The method of inputting the line into the DC network in the multi-end flexible DC power transmission system can realize live inputting of the DC line.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a method for inputting lines into a DC network in a multi-terminal flexible DC transmission system. Background technique [0002] Since the current multi-terminal flexible HVDC transmission projects do not apply the technology of live switching of converter stations and DC side fault isolation technology, when any problem occurs in the DC line and needs to be shut down or the DC system needs to be re-introduced after the line is repaired, it is adopted. The simplest way is to shut down the entire DC system and switch it into the DC line without power. After the input is completed, the power is turned on again for operation. This method will inevitably cause the interruption of the DC network power supply. [0003] At the same time, due to the effect of line capacitance (especially the larger capacitance of the submarine cable) when the line is put into operation, if the ci...
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IPC IPC(8): H02J3/36H02J1/00
CPCY02E60/60
Inventor 裘鹏陆翌黄晓明许烽陈骞童凯宣佳卓
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY