Grounding device for flexible DC power transmission system

A technology for grounding devices and power transmission systems, applied in emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve problems such as overvoltage and DC bias voltage
CN108448604AActive Publication Date: 2018-08-24GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
Publication Date
2018-08-24

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Abstract

The invention provides a grounding device for a flexible DC power transmission system, and the grounding device includes a high impedance branch circuit, a low impedance branch circuit and an energy absorption branch circuit, wherein the high impedance branch circuit, the low impedance branch circuit and the energy absorption branch circuit are connected in parallel. The high impedance branch circuit includes a first power electronic switch and a first impedance unit, and the low impedance branch circuit includes a second power electronic switch and a second impedance unit. The grounding device also includes a control module for triggering the first power electronic switch or the second power electronic switch to be turned on so as to connect the first impedance unit or the second impedance unit to the flexible DC power transmission system. Compared with the prior art, the grounding device can connect different impedance branch circuits according to the demands of the actual working conditions of the flexible DC power transmission system. Meanwhile, each of the high impedance branch circuit and the low impedance branch circuit comprises one power electronic switch, so the groundingdevice can flexibly control the switching of the high impedance branch circuit and the low impedance branch circuit.
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Description

technical field

[0001] The invention relates to the field of power electronics technology, in particular to a grounding device for a flexible direct current transmission system. Background technique

[0002] The flexible DC transmission system uses power electronic devices that can be turned off, and by controlling the amplitude and phase angle of the output voltage of the power electronic devices, it can realize fast and independent control of active power and reactive power. The flexibility of operation has significant application advantages in the fields of new energy power generation grid integration, offshore wind power grid integration, large-scale urban power supply, grid interconnection, long-distance high-voltage large-capacity DC transmission, etc.

[0003] The traditional HVDC flexible transmission system mainly adopts the high-resistance grounding method of the neutral point of the AC side connected to the valve side of the transformer, which can suppress the imp...

Claims

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