Flexible direct current transmission line discharge method and device, storage medium
A flexible DC and transmission line technology, applied in power transmission and AC networks, etc., can solve problems such as increased test time, increased engineering costs, accelerated discharge, etc., and achieves the effects of controllable discharge time, strong adaptability, and reliable work.
Active Publication Date: 2022-01-14
NR ELECTRIC CO LTD +1
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Problems solved by technology
The first method is to add knife switches and resistance grounding loops at both ends of the cable to accelerate the discharge. The first method requires additional complex equipment to achieve safe and fast discharge.
The second method is to accelerate the discharge with the help of DC energy consumption devices, and the second method cannot be realized in systems without design or installation of energy consumption devices
Taking the offshore soft straight as an example, the core equipment is assembled in the dock and the high-pressure test is completed, and the huge energy-consuming devices are generally not included, which doubles the test time and significantly increases the project cost.
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.
[0028] It should be understood that the terms "first", "second" and the like in the claims, specification and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. The terms "comprising" and "comprises" used in the specification and claims of this application indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or more other features, intege...
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The present application provides a flexible direct current transmission line discharge method and device, and a storage medium. The method includes: using the DC line residual voltage to charge the converter, and judging whether the charging can be completed; if the charging can be completed, unlocking the converter valve; if the charging cannot be completed, closing the AC incoming line switch, and charging the converter , and judge whether the charging can be completed again; if the charging can be completed, turn on the AC incoming line switch and unlock the converter valve at the same time; when the DC line voltage is lower than the safe voltage setting or the average Voltage setting, blocking converter.
Description
technical field [0001] The application relates to the technical field of electric power system transmission, in particular to a discharge method and device for a flexible direct current transmission line, and a storage medium. Background technique [0002] As the most controllable power transmission method at present, flexible DC transmission is widely used in new energy grid connection, island power supply, offshore platform power supply and other occasions. It is also an advantageous solution for grid interconnection and power supply in large city centers. [0003] In many occasions, flexible DC transmission uses cables as the transmission medium. Since the long cable has a large equivalent capacitance, energy will be stored after the DC current passes through it. Therefore, it takes as long as 30 to 60 minutes to release the electricity accumulated on the cable after the flexible DC transmission stops. Personal safety brings many hidden dangers. This problem is particul...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60H02M7/4835H02M1/322
Inventor 詹长江胡兆庆邵震霞李钢董云龙卢宇
Owner NR ELECTRIC CO LTD