Starting method of flexible DC transmission system

A technology of flexible direct current transmission and power transmission system, which is applied in the field of flexible power transmission and distribution, and can solve problems such as large inrush currents

Active Publication Date: 2016-06-22
TBEA SUNOASIS +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for starting a flexible direct current transmission system to solve the problem of large inrush current generated when the converter is unlocked in a flexible direct current transmission system including a diode clamp module

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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

[0043] The present invention makes the uncontrolled rectification and charging characteristics of the diode clamping module (DCSM) the same as that of the half-bridge module (HBSM) by rationally utilizing the guiding IGBT in the diode clamping module, thereby achieving higher DC bus voltage to reduce the large inrush current generated when the converter is unlocked.

[0044] 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.

[0045] The following combination figure 1 , 2 , 3, 4 describe the principle of the present invention in detail.

[0046]...

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Abstract

The invention provides a method for starting a flexible direct current transmission system, which is applied to a flexible direct current transmission system including a diode clamp module. The flexible DC transmission system of the clamp module, and uncontrolled rectification charging; 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 diode clamp 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 D-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 method for starting a flexible DC power transmission system including a diode clamp module. Background technique [0002] 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. [0003] In order to reduce the loss and the number of components, the early MMC used the cascaded form of half-bridge submodules, but the MMC in the cascaded form of half-bridge submodules cannot effectively block the DC fault. Therefore, the improved diode clamp module (DiodeClampSubmodule, DCSM) based MMC (called D-MMC) was thus created. In addition to retaining the general advantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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