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Method and device for modifying modulation degree of modular multilevel converter

A modular multi-level, inverter technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve problems such as modulation deviation

Active Publication Date: 2020-04-03
XIDIAN POWER RECTIFIER XIAN +1
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Problems solved by technology

[0004] The main purpose of this application is to provide a method for modifying the modulation degree of a modular multi-level converter, so as to solve the difference between the modulation degree of the converter obtained by using the basic operating principle of the voltage source converter in the prior art and the actual modulation degree. The problem of large system deviation

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  • Method and device for modifying modulation degree of modular multilevel converter
  • Method and device for modifying modulation degree of modular multilevel converter
  • Method and device for modifying modulation degree of modular multilevel converter

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Embodiment Construction

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0033] Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermor...

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Abstract

The present application discloses a method and device for modifying the modulation degree of a modular multilevel converter. The method includes: obtaining the switching function and the bridge arm current of the converter; iterating according to the switching function and the bridge arm current Calculate the bridge arm output voltage of the converter, and in the iterative calculation process, modify the bridge arm current and the switching function based on the bridge arm output voltage calculated by each iteration, so that the bridge arm The deviation between the amplitude and phase angle of the fundamental wave component of the output voltage and the amplitude and phase angle of the corresponding fundamental wave modulation voltage of the converter are all within the corresponding preset range; The modulation degree of the converter is calculated based on the amplitude of the fundamental wave component of the output voltage of the bridge arm. The present application solves the problem that the modulation degree of the converter obtained by using the basic operation principle of the voltage source converter in the prior art deviates greatly from the actual modulation degree.

Description

technical field [0001] The present application relates to the field of modular multilevel converters, in particular, to a method and device for modifying the modulation degree of a modular multilevel converter. Background technique [0002] Modular multilevel converter (MMC) is a new type of voltage conversion circuit. It can superimpose and output high voltage by cascading multiple sub-modules, and it also has less output harmonics and modularity. High-level features, so it has broad application prospects in power systems. [0003] The modulation degree of the modular multilevel converter (MMC) is closely related to the power operating range of the converter, and the modulation degree of the converter is directly related to the research on the operating characteristics of the converter. Modular multilevel converter (MMC) technology is developing rapidly. At present, research on modular multilevel converters is mainly focused on its control strategy. Some literatures have d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/0003
Inventor 苟锐锋宋志顺杨晓平任军辉杨帆
Owner XIDIAN POWER RECTIFIER XIAN
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