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A Method for Reducing Capacitance Value of Modular Multilevel Converter

A modular multi-level, multi-level converter technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc.

Active Publication Date: 2017-01-04
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Since the bridge arms of each phase in the MMC are separated, there is no offsetting effect of the three-phase current on the capacitor, and the capacitor voltage fluctuation on the sub-module is mainly the fundamental frequency component and the double frequency component, so the required Capacitance capacity is usually large

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  • A Method for Reducing Capacitance Value of Modular Multilevel Converter

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Embodiment Construction

[0019] The method for reducing the capacitance value of the modularized multilevel converter proposed by the present invention, wherein the structural diagram of the modularized multilevel converter involved is as follows figure 1 As shown, the method includes the following steps:

[0020] (1) Set the rated value U of the DC component of the capacitor voltage of the modular multilevel converter sub-module cap1 and the maximum allowable peak value of the capacitor voltage U of the modular multilevel converter sub-module cmax , sub-module capacitor voltage DC component rated value U cap1 Generally, the value is 50% to 60% of the rated voltage of the switching device used in the modular multilevel converter, and the maximum allowable peak value of the sub-module capacitor voltage U cmax Generally, it is the rated value of the DC component of the sub-module capacitor voltage U cap1 1.05 to 1.1 times;

[0021] (2) According to the DC side voltage U of the modular multilevel con...

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Abstract

The invention relates to a method capable of reducing the capacitance value of a modular multilevel converter, and belongs to the technical fields of voltage source converters and direct current transmission. The method of the present invention appropriately reduces the operating value of the DC component of the submodule capacitor voltage by a certain ratio relative to the rated value of the DC component of the capacitor voltage of the submodule, and at the same time maintains the number of submodules cascaded in the bridge arm and the peak value of the capacitor voltage of the submodule, so that the submodule The allowable amplitude of the maximum capacitor voltage fluctuation is increased. Since the greater the allowable range of the maximum capacitor voltage fluctuation of the sub-module is, the smaller the required sub-module capacitance is, so the sub-module can select a smaller capacitance value. Since the cost and volume of capacitors in the modular multilevel converter account for a large proportion overall, the method of the present invention has significant benefits in reducing the cost and volume of the modular multilevel converter .

Description

technical field [0001] The invention relates to a method for reducing the capacitance value of a modularized multilevel converter, and belongs to the technical field of voltage source converters and the technical field of direct current transmission. Background technique [0002] Modular multilevel converters (hereinafter referred to as MMCs) are easy to implement a large number of levels, and can provide a common DC side, and can be easily connected back to back, making them very suitable for DC transmission applications. The emergence and development of MMC technology makes it possible to realize higher voltage, larger capacity and higher performance voltage source converters in the field of direct current transmission, which greatly promotes the development of voltage source direct current transmission technology. Since the emergence of MMC technology, most of the voltage source DC transmission projects have adopted the MMC topology or changes based on it. [0003] The b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 宋强杨文博朱喆许树楷黎小林刘文华
Owner TSINGHUA UNIV