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Direct-current energy consumption device and control method thereof

A technology of energy-consuming devices and energy-dissipating resistors, which is applied in the direction of circuit devices, emergency protection circuit devices, and emergency protection circuit devices for limiting overcurrent/overvoltage, and can solve power failure, system equipment safety hazards, direct current Problems such as high voltage of transmission lines to achieve the effect of improving safety and reliability

Inactive Publication Date: 2020-12-15
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] In scenarios such as using flexible DC to realize offshore wind power grid connection, if a fault occurs at the power receiving end and the power cannot be sent out, the wind turbine is still sending out power at this time, and the energy will be stored on the DC side, causing the voltage of the DC transmission line to be abnormally high. Hazards to system equipment safety

Method used

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  • Direct-current energy consumption device and control method thereof
  • Direct-current energy consumption device and control method thereof
  • Direct-current energy consumption device and control method thereof

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Embodiment Construction

[0022] 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.

[0023] 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 sequence. 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, int...

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Abstract

The invention provides a direct-current energy consumption device and a control method thereof. The direct-current energy consumption device comprises at least one energy consumption sub-module and atleast one energy consumption resistor which are connected in series, one end of the energy consumption sub-module is connected with a high-potential electrode and the other end of the energy consumption sub-module is connected with a low-potential electrode after series connection, and the energy consumption sub-module comprises a first switch unit, a second switch unit, an energy storage deviceand a current limiting unit. The first switch unit comprises a first turn-off semiconductor device and a first fly-wheel diode which are connected in antiparallel; the second switch unit and the firstswitch unit are connected in series in the same direction, the second switch unit comprises a second turn-off semiconductor device and a second fly-wheel diode which are connected in parallel in theopposite direction, and the two ends of the second switch unit serve as connecting terminals of the energy consumption sub-module; and the current limiting unit is connected in series with the energystorage device and then is connected in parallel with a series branch of the first switch unit and the second switch unit.

Description

technical field [0001] The present application relates to the technical field of electric power system transmission, in particular to a DC energy consumption device and a control method thereof. 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 scenarios such as using flexible direct current to realize offshore wind power grid connection, if a fault occurs at the power receiving end and the power cannot be sent out, the wind turbine is still sending out power at this time, and the energy will be stored on the DC side, causing the voltage of the DC transmission line to be abnormally high. Hazard to system equipment safety. The danger can be avoided by installing DC energy-consumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02J3/36
CPCH02H9/04H02J3/36Y02E60/60
Inventor 詹长江邵震霞李钢汪涛董云龙卢宇
Owner NR ELECTRIC CO LTD
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