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Adaptive modulation method for submodule capacitor voltage of modular multi-level commutation device

A modular multi-level, adaptive modulation technology, applied in the direction of output power conversion devices, electrical components, etc., to achieve the effect of reducing output current THD, reducing loss and increasing life

Inactive Publication Date: 2013-01-30
XJ ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a modularized multilevel converter device sub-module capacitor voltage adaptive modulation method to solve the above-mentioned adverse effects

Method used

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  • Adaptive modulation method for submodule capacitor voltage of modular multi-level commutation device
  • Adaptive modulation method for submodule capacitor voltage of modular multi-level commutation device
  • Adaptive modulation method for submodule capacitor voltage of modular multi-level commutation device

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] In the output waveform modulation of the converter device, the DC support capacitor voltage of the sub-module is first calculated according to the DC bus voltage of the system, as shown in formula (2).

[0023] u c =U dc / (n SM +K) (2)

[0024] Then according to the calculated voltage U c Modulate the converter device to ensure the DC support capacitor voltage U of its sub-modules c is the calculated value.

[0025] When one of the sub-modules fails, the faulty sub-module is bypassed, and the DC bus voltage of the system is only reduced by the voltage U in an instant. c , which has little influence on the entire DC bus voltage. When the DC support capacitor voltage of the sub-module is calculated according to formula (4),

[0026] u c =U dc / (n SM +K-1) (4)

[0027] Then modulate, the DC bus capacitor voltage rises to the original set value....

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Abstract

The invention relates to an adaptive modulation method for submodule capacitor voltage of modular multi-level commutation device. The method comprises the following step of carrying out voltage distribution on a redundant submodule and a standard configuration submodule centrally in ladder wave control, wherein under the condition with same direct-current busbar voltage, the submodule direct-current support capacitor voltage is lowered greatly, and because the submodule working voltage is lowered, according to the invention, not only can the loss of power devices including single submodule IGBT and a direct-current support capacitor be lowered, but also the service lives of the power devices including the submodule direct-current support capacitor, an auxiliary power supply and the like can be prolonged, the output voltage waveform level also can be increased, so that the output current THD (total harmonic distortion) can be lowered.

Description

technical field [0001] The patent of the present invention relates to the DC support capacitor voltage modulation technology of the flexible DC transmission converter valve sub-module, and the patent adopts the variable and adaptive modulation technology of the capacitor voltage. Background technique [0002] The traditional high-voltage direct current transmission (HVDC) converter device uses a current source (LCC) converter with a thyristor as a power device. Since the thyristor cannot be turned off automatically, a large amount of reactive power compensation is required during the operation of the converter device (rectification and inverter) , during normal operation, it can reach 40-60% of the DC transmission power, and the converter device will generate harmonics on both the AC side and the DC side during operation, and a filter needs to be installed, so the converter station is more complicated and expensive , Operation and management requirements are high. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00
Inventor 姚为正刘刚夏克鹏李海鲲孙健安昱黄岩王善忠
Owner XJ ELECTRIC