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Single-clamp sub-module type MMC-HVDC far-end starting method

An MMC-HVDC, clamping sub-module technology, applied in the field of power transmission and distribution, can solve complex and rarely mentioned problems, and achieve the effect of avoiding excessive sudden jump, avoiding DC voltage sag and overcurrent

Active Publication Date: 2017-03-15
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the research on the structure of SCSM continues to deepen, due to its structural characteristics, the problems related to the startup of SCMMC-HVDC are more complicated, and the research on its startup method, especially the research on the remote startup method, is rarely mentioned.

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  • Single-clamp sub-module type MMC-HVDC far-end starting method

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited by the examples.

[0033] figure 1 It is the topological structure diagram of SCMMC. SCMMC is composed of 6 bridge arms, and each bridge arm is composed of several sub-modules (SM 1 ...SMn) is connected in series with bridge arm reactor L, wherein each sub-module adopts SCSM structure, and the upper and lower bridge arms together form a phase unit. figure 1 Middle U dc Indicates DC voltage.

[0034] figure 2 It is the structure diagram of the SCSM sub-module, which includes 3 IGBTs (T1, T2, T3), three corresponding reverse diodes (D1, D2, D3), 1 reverse independent diode D4 and 1 capacitor C, U C is the capacitor voltage of each sub-module, U SM Indicates the output voltage of a single submodule.

[0035] Table 1 is the working state table of the single-clamp sub-module SCSM. The sub-module operat...

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Abstract

The invention discloses a single-clamp sub-module type MMC-HVDC far-end starting method. The number of sub modules in semi-locked states on an active side convertor station bridge arm is gradually increased through sequentially alternating trigging strategies; the continuous charging of the sub modules on the active side convertor station is ensured under the premise of avoiding overhigh sudden jump of a direct current voltage; the overall starting method ensures slow and gradual boosting of the direct current voltage while enables the system to be in steady transition in a semi-locked charging process; and pre-charging for passive side convertor station sub modules can be completed on the basis of reducing the direct current voltage drop as far as possible through sequentially alternating bypass control strategies. By adoption of the starting method, the problems of direct current voltage sudden change and overcurrent in the unlocking moment of a converter valve caused by a conventional charging way are effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, in particular to a single-clamp sub-module type MMC-HVDC remote starting method. Background technique [0002] Modular Multilevel Converter based High Voltage Direct Current (MMC-HVDC), with its unique technical advantages, is very suitable for high-voltage, high-power power supply occasions, and is used in wind farm grid connection and grid interconnection It has huge engineering advantages in fields such as black start, city center power supply, etc., and has become the most mainstream topology of flexible DC power transmission in the future. Half-Bridge Sub-Module (HBSM) is the optional structure of the main MMC sub-module. At present, almost all MMC-HVDC projects use Half-Bridge MMC (Half-Bridge MMC, HBMMC) as its topology. structure. Due to the high cost, complex technology and immature industrial application, the engineering application of DC circuit breakers i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M7/487
CPCY02E60/60H02J3/36H02M7/487
Inventor 王朝亮韩霄汉陆翌严华江吕文韬叶方彬赵羚田家乐刘颖
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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