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Full-bridge modular multilevel converter sub-module capacitor voltage fluctuation suppression method

A modular multi-level, capacitor voltage technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. Problems such as limited peak pressure boosting ability and insignificant fluctuation suppression effect

Active Publication Date: 2021-08-06
TIANSHENGQIAO BUREAU CSG EHV POWER TRANSMISSION CO
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Problems solved by technology

However, due to the limited boosting capacity of the AC side phase voltage peak value in practical application scenarios, the traditional full-bridge MMC sub-module capacitor voltage fluctuation suppression method does not have a significant suppression effect on sub-module capacitor voltage fluctuations.
[0004] Therefore, the traditional full-bridge type MMC sub-module capacitor voltage fluctuation suppression method has the problem of poor suppression effect of sub-module capacitor voltage fluctuations

Method used

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  • Full-bridge modular multilevel converter sub-module capacitor voltage fluctuation suppression method
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  • Full-bridge modular multilevel converter sub-module capacitor voltage fluctuation suppression method

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Embodiment Construction

[0050] In order to make the purpose, technical solution and advantages of the present application clearer, the present application 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 application, and are not intended to limit the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.

[0052] It can be understood that the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, un...

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Abstract

The invention relates to a full-bridge MMC sub-module capacitor voltage fluctuation suppression method. The method comprises the steps of: acquiring an AC side current amplitude of a full-bridge MMC, and acquiring a theoretically required circulating current value according to the AC side current amplitude, a power factor angle, and a sub-module capacitor voltage fluctuation component model of the full-bridge MMC; acquiring an upper bridge arm current instantaneous value, a lower bridge arm current instantaneous value and a direct current instantaneous value of the full-bridge MMC, and calculating to obtain an actual circulating current value of the full-bridge MMC; and calculating a difference value between the theoretically required circulating current value and the actual circulating current value, generating a reference voltage according to the difference value, injecting the reference voltage into the full-bridge MMC, generating the required circulating current in each phase after modulation, and suppressing the capacitor voltage fluctuation of each sub-module. According to the full-bridge MMC sub-module capacitor voltage fluctuation suppression method, the corresponding reference voltage can be injected according to the actual circulation value, and the sub-module capacitor voltage fluctuation suppression effect can be improved.

Description

technical field [0001] The present application relates to the technical field of full-bridge modular multilevel converters, in particular to a method for suppressing fluctuations in capacitor voltage of sub-modules of full-bridge modular multilevel converters. Background technique [0002] Modular multilevel converter (MMC) has become the preferred choice of converters in flexible DC transmission due to its advantages of no dynamic and static voltage equalization problems for switching devices, easy expansion, high system efficiency and good output waveform quality. Preferred topology. Among them, the full-bridge MMC is based on the full-bridge sub-module with negative level output capability, and has good DC short-circuit fault ride-through and DC voltage reversal characteristics. Broad application prospects. For full-bridge MMC, each bridge arm contains a large number of cascaded sub-modules, and each sub-module contains a capacitor. During steady-state operation, the ca...

Claims

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Application Information

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IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 陈小平郝良收王磊张杰戴甲水涂小刚
Owner TIANSHENGQIAO BUREAU CSG EHV POWER TRANSMISSION CO
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