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A recent level control method for modular multilevel converter rectifiers

A modular multi-level and control method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems affecting output waveforms and changes in the average value of sub-module voltages, etc. Achieve the effects of improved output waveform quality, improved output waveform quality, and low switching frequency

Active Publication Date: 2017-12-15
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some literature proposes to improve the nearest level control method by changing the rounding point of the rounding function, but this method will cause changes in the average value of the sub-module voltage and affect the output waveform

Method used

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  • A recent level control method for modular multilevel converter rectifiers
  • A recent level control method for modular multilevel converter rectifiers
  • A recent level control method for modular multilevel converter rectifiers

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0031] figure 1 Shown is the principle diagram of the main circuit structure of the 16-module single-phase MMC rectifier of the present invention. The main circuit structure of the single-phase MMC rectifier is shown in the figure above. Each bridge arm is composed of 8 half-bridge sub-modules and a bridge arm inductor. The sub-modules of the upper bridge arm are numbered SM1~SM8, and the numbe...

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Abstract

The invention discloses an improved method for the closest level control for increasing the number of levels applied in a modular multilevel converter, which belongs to the technical field of power electronics. In the prior art, the output waveform quality of the nearest level control method is Not high, the present invention superimposes a fractional part offset y on the number of theoretically conducted modules of the upper and lower bridge arms, and controls its value range accordingly, so that the number of output waveform levels is controlled by the conventional nearest level The N+1 of the method is increased to 2N+1, N is the number of sub-modules in the bridge arm, the quality of the output waveform is obviously improved and improved, and the total harmonic distortion is reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically, relates to an improved method applied in a rectifier of a modular multilevel converter to realize the latest level control of increasing the number of levels. Background technique [0002] Modular multilevel converters have a wide range of applications, and have broad application prospects in high-voltage and high-power fields such as high-voltage flexible DC transmission, power quality control, and medium-high voltage and high-power motor drives. [0003] Modular multi-level converters have two modulation methods that are relatively mature at present, which are multi-carrier PWM modulation method and the latest level-controlled modulation method. In the multi-carrier PWM modulation method, the phase-shifted carrier method is mostly used. For the occasion with a small number of sub-modules, the level generally does not exceed 5 levels, and a higher equivalent swit...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
Inventor 林磊林艺哲何震廖永福
Owner HUAZHONG UNIV OF SCI & TECH