A method for starting a flexible direct current transmission system

A power transmission system, flexible DC 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 impact

Active Publication Date: 2019-01-29
TBEA SUNOASIS +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • 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

[0044] The present invention makes the uncontrolled rectification and charging characteristics of the clamping double sub-module (CDSM) the same as the uncontrolled rectification and charging characteristics of the half-bridge module (HBSM) by rationally utilizing the guide IGBT in the clamping double sub-module, so that a higher direct current can be achieved. The bus voltage can reduce the large inrush current generated when the inverter is unlocked, and it will not generate additional power loss.

[0045] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present i...

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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 clamp double 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 C-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 [0002] A start-up method of a flexible direct current transmission system of sub-modules. Background technique [0003] Compared with the traditional voltage source converter, the Modular Multilevel Converter (MMC) has the advantages of good scalability, small harmonics, low switching frequency, and less requirements for consistent triggering of devices, especially suitable for DC power transmission applications. [0004] In order to reduce the loss and the number of components, the early MMC adopts 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 MMC based on the clamp double submodule (CDSM) An improved MMC (called C-MMC) is gaining more and more popularity. In addition to retaining the general advantages of the early MMC, the ...

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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