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Starting method of flexible DC transmission system

A flexible DC power transmission and power transmission system technology, applied in the field of flexible power transmission and distribution, can solve the problems of large inrush current and power loss, and achieve the effect of small DC current inrush

Active Publication Date: 2016-06-22
TBEA SUNOASIS +2
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Problems solved by technology

[0007] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a start-up method of a flexible direct current transmission system, which is used to solve the problem of large inrush current generated when the converter is unlocked in a flexible direct current transmission system including clamping twin The problem of additional power loss

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  • Starting method of flexible DC transmission system
  • Starting method of flexible DC transmission system
  • Starting method of flexible DC transmission system

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Embodiment Construction

[0044] The present invention makes the uncontrolled rectification and charging characteristics of the clamping twin sub-module (CDSM) the same as that of the half-bridge module (HBSM) by rationally utilizing the guiding IGBT in the clamping twin sub-module, thereby achieving higher DC The bus voltage can reduce the large inrush current generated when the converter is unlocked, and will not cause additional power loss.

[0045] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are part of the embodiments of the present invention, 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.

[0046] Combine the following figure 1 , 2 , 3, 4 describe the princi...

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Abstract

The present invention provides a method for starting a flexible direct current transmission system, which is applied to a flexible direct current transmission system including clamp twin sub-modules. In the second charging stage, the leading IGBT of the converter connected to the grid is turned on, the converter on the rectification side is unlocked, and the converter on the inverter side is unlocked. converter, so that the charging voltage of the converter of the clamping twin sub-module can reach the charging voltage of the converter of the half-bridge module, thus solving the shock when the converter is unlocked caused by the low charging voltage of the flexible direct current transmission system of the C-MMC module For the problem of large current, the flexible direct current transmission system is started by this method, and both the alternating current impact and the direct current impact are relatively small.

Description

technical field [0001] The invention relates to the technical field of flexible power transmission and distribution, in particular to a clamping double [0002] The method for starting the flexible direct current transmission system of the sub-module. Background technique [0003] Compared with the traditional voltage source converter, the modular multilevel converter (ModularMultileverConverter, MMC) has the advantages of good scalability, small harmonics, low switching frequency, and less requirements for consistent triggering of devices, and is especially suitable for DC transmission application occasions. [0004] In order to reduce the loss and the number of components, the early MMC adopted the cascaded form of half-bridge submodules, but the MMC in the form of cascaded half-bridge submodules cannot effectively block the DC fault. MMC (called C-MMC) is gaining more and more popularity. In addition to retaining the general advantages of the early MMC, the topology of...

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Application Information

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IPC IPC(8): H02J3/36H02M1/36
CPCY02E60/60
Inventor 李战龙侯丹刘伟增黎小林许树楷陈名秦健冯建云
Owner TBEA SUNOASIS
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