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Method and device for correcting modulation degrees of modularized multi-level converters

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: 2019-02-15
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 correcting modulation degrees of modularized multi-level converters
  • Method and device for correcting modulation degrees of modularized multi-level converters
  • Method and device for correcting modulation degrees of modularized multi-level converters

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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 invention discloses a method and device for correcting modulation degrees of modularized multi-level converters. The method comprises the following steps of: obtaining a switch function and arm current of a converter; iteratively calculating arm output voltage of the converter according to the switch function and the arm current, and in the iterative calculation process, correcting the arm current and the switch function on the basis of the arm output voltage obtained in each iterative calculation so as to ensure that deviations between an amplitude and a phase angle of a fundamental component of the arm output voltage and an amplitude and a phase angle of a fundamental modulation voltage of the converter are located in a corresponding preset ranges; and calculating a modulation degreeof the converter according to the amplitude of the fundamental component of the arm output voltage obtained via the iterative calculation. The method and device are capable of solving the problem that the converter modulation degrees solved by adoption of basic operation principle of voltage source converters have relatively large deviations with practical modulation degrees in the prior art.

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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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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