High-frequency oscillation suppression device

A technology for suppressing device and high frequency oscillation, applied in the field of power grid, can solve the problems of reducing the dynamic response capability of the flexible DC system, reducing the fault ride-through capability of the flexible DC system, etc., to achieve the effect of improving the stability

Pending Publication Date: 2022-01-11
西安西电高压开关有限责任公司 +1
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  • Abstract
  • Description
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Problems solved by technology

Therefore, the existing processing methods not only reduce the dynamic response capability of the flexible DC system, but also reduce the fault ride-through capability of the flexible DC system

Method used

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0035] Such as figure 1 As shown, it is a high-frequency oscillation suppression device disclosed in the present invention, including: a flexible DC system and a filter, wherein the flexible DC system includes a modular multilevel converter and a converter transformer, wherein:

[0036] The modular multilevel converter is connected to the grid-connected busbar of the AC grid through the converter transformer;

[0037] One end of the filter is connected to the...

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Abstract

The invention discloses a high-frequency oscillation suppression device. The high-frequency oscillation suppression device comprises a flexible direct current system and a filter, and the flexible direct current system comprises a modular multilevel converter and a converter transformer, wherein the modular multilevel converter is connected with a grid-connected bus of an alternating current power grid through the converter transformer; and one end of the filter is connected with a grid-connected bus of the AC power grid, and the other end of the filter is grounded. According to the method, high-frequency oscillation between the MMC converter of the flexible direct current system and the alternating current power grid can be effectively suppressed, the stability of the flexible direct current system is improved, and meanwhile, the dynamic response and fault ride-through capability of the flexible direct current system are not influenced.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a high-frequency oscillation suppression device. Background technique [0002] The flexible direct current transmission technology (high voltage direct current, HVDC) based on the modular multilevel converter (MMC) has developed rapidly in recent years due to its superior performance. The bipolar transistor (Insulate-Gate Bipolar Transistor, IGBT) converter station has the advantages of convenient expansion and boosting, no dynamic and static voltage equalization problems of devices, good harmonic characteristics of AC voltage, and low high-frequency electromagnetic interference, etc., which can be used for weak The AC grid provides voltage and reactive power support, and has the function of inter-regional asynchronous interconnection of the grid. [0003] Since 2010, most of the newly-built flexible DC transmission projects at home and abroad have adopted the modular multil...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/01H02J3/36
CPCH02J3/002H02J3/01H02J3/36H02J2003/365Y02E40/40Y02E60/60
Inventor 胡丁文王传川曾林翠王莉李亮亮陆平董瑞刘浩锋满心锁
Owner 西安西电高压开关有限责任公司
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