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A Submodule Ratio Constraint Determination Method for Reliable Charging of Hybrid MMCs

A determination method and sub-module technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve problems such as difficult to clear DC faults

Active Publication Date: 2021-08-27
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when a short-circuit fault occurs on the DC side of the half-bridge MMC, the AC power supply, the anti-parallel diode and the short-circuit point will form a short-circuit loop, making it difficult to quickly clear the DC fault.

Method used

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  • A Submodule Ratio Constraint Determination Method for Reliable Charging of Hybrid MMCs
  • A Submodule Ratio Constraint Determination Method for Reliable Charging of Hybrid MMCs
  • A Submodule Ratio Constraint Determination Method for Reliable Charging of Hybrid MMCs

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Embodiment Construction

[0024] The present invention will be described in more detail with reference to the accompanying drawings and specific embodiments.

[0025] Each bridge in the hybrid MMC contains two and more sub-modules. According to currently common sub-module types, it is generally included in the half-bridge module HBSM, all bridge module FBSM, and clamp two-child module CDSM. Sub-module combined types, based on actual needs.

[0026] To meet the general analysis requirements, figure 1 A structural schematic diagram containing three sub-modules containing HBSM, FBSM, and CDSM is given, and a charging path is given. Assume that the DC rated voltage is U dr , Voltage modulation ratio is m, the total number of arms of each bridge is N, each of the number of HBSMs per bridge h , Cdsm number n c , The number of FBSM is n f U pp For the phase voltage axon, U cr Rated voltage for the child module, U ch For HBSM voltage, u cc For CDSM voltage, U cf For the FBSM voltage. According to the general defin...

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Abstract

The invention discloses a method for determining sub-module ratio constraints for realizing reliable charging of a hybrid MMC. The technical solution adopted in the present invention is: for the combination type containing any two or three of the half-bridge sub-module HBSM, the full-bridge sub-module FBSM and the clamping twin sub-module CDSM, the number of sub-modules of different types is defined The proportional relationship ensures that the hybrid MMC can realize reliable and safe charging during the uncontrolled charging stage, and prevent uncontrollable undervoltage or overvoltage damage of sub-modules.

Description

Technical field [0001] The present invention belongs to the field of flexible DC transmission, in particular to a sub-module proportional constraint determination method for realizing the reliable charge of the hybrid MMC. Background technique [0002] The half-bridge type MMC based on the half-bridge module HBSM is the topological form of the current engineering commonly used. However, when the half-bridge type MMC is short-circuited in the DC side, the AC power supply, the anti-parallel diode, and the short road point will form a short circuit loop, which is difficult to quickly remove DC failure. In order to make the MMC have DC fault clearance capabilities, domestic and foreign scholars propose full-bridge-type MMC based on the full bridge module FBSM, based on clamp type MMC, HBSM, FBSM or CDSM, etc., based on HBSM, FBSM or CDSM, etc. The mixed MMC has a variety of advantages of the hybrid MMC and the genetic module attributes. [0003] Under the high-voltage scene, the work...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00
CPCH02M7/00
Inventor 许烽黄晓明陆翌裘鹏丁超陆承宇
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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