A method for starting a flexible direct current transmission system

A technology for flexible DC and power transmission systems, applied in the field of flexible power transmission and distribution, which can solve problems such as large inrush currents

Active Publication Date: 2019-06-04
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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  • A method for starting a flexible direct current transmission system
  • A method for starting a flexible direct current transmission system
  • A method for starting a flexible direct current 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 starting method of a flexible DC transmission system. The starting method is applied to the flexible DC transmission system which comprises diode clamp submodules. In a first charging state, charging resistors of current transformers which are accessed to a power grid are connected to the flexible DC transmission system comprising the diode clamp submodules, and carries out uncontrolled rectification charging; in a second charging state, guide IGBT of each current transformer accessed to the power grid is switched on, the current transformer at a rectifying side is unlocked, and the current transformer at an inverting side is unlocked, so that a charging voltage of a current converter of each diode clamp submodule can reach a charging voltage of a current converter of a half-bridge module, thereby solving the problem of a D-MMC module that the surge current is large when unlocking the current converters due to low charging voltage of the flexible DC transmission system. The flexible DC transmission system started adopting the starting method has small AC current surge and small DC current surge.

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 traditional voltage source converters, modular multilevel converters (Modular Multilevel Converter, MMC) have the advantages of good scalability, small harmonics, low switching frequency, and less requirements for consistent triggering of devices, especially for DC power transmission applications. [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 diode clamping module (Diode Clamp Submodule, DCSM) based Improved MMC (called D-MMC) resulting. In addition to retaining the general advantages of the early MMC, the topol...

Claims

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Application Information

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Patent Type & Authority Patents(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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