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Optimal modulation method of full-bridge modular multilevel converter

A modular multi-level and modulation method technology, applied in the field of voltage converters, can solve the problems of unsuitable voltage boosting operating conditions, not considering the negative level output of integer sub-modules, etc., so as to reduce filtering costs and reduce total harmonics. Distortion rate, effect of increasing harmonic frequencies

Active Publication Date: 2019-12-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to propose an optimized modulation method for a full-bridge modular multilevel converter, aiming to solve the inapplicability of the prior art due to the lack of consideration of the negative level output of the integer sub-module Problems in pressure-lifting operating conditions

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  • Optimal modulation method of full-bridge modular multilevel converter
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[0037] 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.

[0038] To achieve the above object, the present invention provides an optimized modulation method for a full-bridge modular multilevel converter, such as figure 1shown, including the following steps:

[0039] S1. Determine the capacitor charge and discharge state of the sub-modules in each bridge arm based on the bridge arm current and the bridge arm voltage, and sort the sub-modules according to the capacitor charge and discharge states of the sub-modules and the capacitor voltage of the sub-modules;

[0040] Specifically, the bridge arm of the full-bridge modular multilevel converter includes an...

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Abstract

The invention discloses an optimal modulation method of a full-bridge modular multilevel converter. A bridge arm voltage of an integer input sub-module is modulated and an SAPWM modulation algorithm is provided. Carrier phases of an upper bridge arm and a lower bridge arm are adaptively adjusted by considering positive and negative conditions of a bridge arm voltage of the full-bridge modular multilevel converter under a voltage-boosting operation condition. According to a comparison result of a decimal input sub-module number and an instantaneous value of a bridge arm carrier signal, an output level of a sub-module used for outputting a voltage decimal part is controlled so that modulation of the bridge arm voltages of integer and decimal input sub-modules is realized at the same time, and a load voltage level number can be increased in a whole voltage-boosting operation fundamental wave period of the full-bridge modular multi-level converter. Total harmonic distortion rate of a loadvoltage is effectively reduced, and harmonic frequency of the load voltage is increased. Filtering cost is reduced, and method is suitable for the full-bridge modular multilevel converter under the voltage-boosting operation working condition.

Description

technical field [0001] The invention belongs to the field of voltage converters, and more specifically relates to an optimal modulation method for a full-bridge modular multilevel converter. Background technique [0002] Full Bridge Modular Multilevel Converter (FBMMC), with its flexible sub-module output capability, shows unique advantages in the fields of voltage boost operation, DC fault ride-through, and motor drive. By generating a negative output level through the sub-module, FB MMC can generate a higher amplitude load voltage under the condition of constant DC voltage, realize boosted voltage operation, and increase the capacity of FB MMC. In the case of a short-circuit fault on the DC side, the fault current on the DC side can be eliminated, reactive power compensation can be provided, and DC fault ride-through can be realized without relying on additional devices. The flexible level output capability of the FB MMC sub-module allows the sub-modules of the same bridg...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 林磊何佳璐徐晨
Owner HUAZHONG UNIV OF SCI & TECH
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