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Method for calculating sub-module quantity in bridge arm of modular multi-level current converter

A modular multi-level, multi-level converter technology, applied in the direction of power transmission AC network, etc., can solve the problem of large space requirements and cost of transformers, and achieve the effect of avoiding land occupation and cost problems

Inactive Publication Date: 2012-12-12
TSINGHUA UNIV +1
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Problems solved by technology

However, the transformer in this scheme brings a large space requirement and cost

Method used

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  • Method for calculating sub-module quantity in bridge arm of modular multi-level current converter
  • Method for calculating sub-module quantity in bridge arm of modular multi-level current converter
  • Method for calculating sub-module quantity in bridge arm of modular multi-level current converter

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Embodiment Construction

[0012] The method for calculating the number of sub-modules in the bridge arm of the modular multilevel converter proposed by the present invention comprises the following steps:

[0013] (1) Let the effective value of the line voltage of the AC power grid be U ac , according to the transmission capacity of the transmission line, the rated voltage of the DC side of the modular multilevel converter is determined to be U d , and according to the switching devices used in the modular multilevel converter, the rated voltage of each sub-module in the modular multilevel converter is determined as U c ;

[0014] (2) According to the above DC side rated voltage U d and submodule rated voltage U c , calculate the sum of the sub-module inputs of the upper bridge arm and the lower bridge arm of the modular multilevel converter as K: K=U d / U c ;

[0015] (3) According to the above sub-module rated voltage U c , the effective value of the line voltage U of the AC grid ac And the s...

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Abstract

The invention relates to a method for calculating sub-module quantity in a bridge arm of a modular multi-level current converter, belonging to the technical field of direct current power transmission. The method comprises the following steps of firstly setting a line voltage effective value of an alternating current power grid, determining rated voltage at the direct current side of the modular multi-level current converter according to the transmission capacity of a power transmission line; determining the rated voltage of each sub-module in the modular multi-level current converter according to the used switch apparatus in the modular multi-level current converter; calculating the sum of the doping quantity of the sub-modules of an upper bridge arm and a lower bridge arm of the current converter according to the rated voltage at the direct current side and the rated voltage of the sub-modules; and finally calculating to obtain the cascade quantity of the sub-modules of each bridge arm in the modular multi-level current converter according to the rated voltage of the sub-modules, the line voltage effective value of the alternating current power grid and the sum of the doping quantity of the sub-modules. The method provided by the invention can be used for reducing the cost of the current converter through reducing the quantity of the sub-modules, and further can avoiding the land occupation and cost problems brought by a alternating current transformer.

Description

technical field [0001] The invention relates to a method for calculating the number of sub-modules in a bridge arm of a modular multilevel converter, in particular to a modular multilevel converter when the DC line voltage and the AC grid voltage do not match in a flexible direct current transmission system The invention relates to a calculation method for the number of neutron modules of a bridge arm, which belongs to the technical field of direct current transmission. Background technique [0002] For the sake of sustainable development, using renewable energy such as solar energy and wind energy to generate electricity has become the development direction of the future power system. These power generation methods have the characteristics of being far away from the main grid and fluctuating greatly over time. The flexible DC transmission system is based on the voltage source converter (VSC) and pulse width modulation (PWM) to invert the DC voltage into an AC voltage with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 宋强饶宏罗雨许树楷刘文华黎小林李立浧
Owner TSINGHUA UNIV
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