Loss balance control method for full-bridge modular multilevel converter

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 low economy, complex control, and increase modular multi-level Converter operating costs and other issues to achieve the effect of improving operational reliability, balancing loss, strong economy and practicability

Pending Publication Date: 2022-07-05
SOUTHEAST UNIV
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Problems solved by technology

The loss balance optimization effect of the junction temperature feedback method is better, but the control is complicated, and additional sensors need to be introduced, which increases the operating cost of the modular multilevel converter, and the economy is low

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  • Loss balance control method for full-bridge modular multilevel converter
  • Loss balance control method for full-bridge modular multilevel converter
  • Loss balance control method for full-bridge modular multilevel converter

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Embodiment Construction

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Aiming at the problem of unbalanced internal losses in the full-bridge sub-module of the modularized multilevel converter, the present invention proposes a loss-balanced control method for the full-bridge modularized multilevel converter, wherein the three-phase MMC topology structure and the full-bridge Submodule topology such as figure 2 , image 3 shown. The three-phase MMC consists of six bridge arms, each of which conta...

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Abstract

The invention discloses a loss balance control method for a full-bridge modular multilevel converter, and the method comprises the following steps: collecting the current of a bridge arm, the capacitor voltage of a sub-module, and the switching state of each power device in the sub-module, calculating the average loss of each power device, judging the switching state of the sub-module, and carrying out the calculation of the average loss of each power device. By comparing the average loss of the left and right bridge arms of the full-bridge sub-module, the working time of the sub-module in the two operation modes is adjusted, and finally loss balance is realized. Compared with a conventional method, the loss balancing method is good in loss balancing effect, easy to control and high in economical efficiency, and the construction cost of the modular multilevel converter does not need to be increased.

Description

technical field [0001] The invention belongs to the field of multilevel power electronic converters, in particular to a loss balance control method of a full-bridge type modular multilevel converter. Background technique [0002] Modular Multilevel Converter (MMC) has the advantages of highly modular structure, strong scalability, high output power quality, high-voltage DC bus and redundant control. The fields of piezoelectric motor drive and grid connection of renewable energy have attracted wide attention. Full-bridge modular multi-level converters have the ability to block DC fault currents, and are being gradually applied in high-voltage DC transmission and other fields. [0003] The uneven distribution of the internal losses of the full-bridge sub-module will not only affect the service life of the power device, threaten the reliability of the system operation, but also increase the design difficulty of the cooling device. Therefore, how to balance the internal losses ...

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Application Information

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IPC IPC(8): H02M7/00H02M7/483H02M7/5387
CPCH02M7/00H02M7/483H02M7/5387
Inventor 邓富金李怀龙刘诚恺
Owner SOUTHEAST UNIV
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