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Submodule capacitance voltage fluctuation suppression method of hybrid modular multilevel converter

A modular multi-level, fluctuation suppression technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of increasing MMC loss, increasing switching frequency of switching devices, and not considering mixing Type MMC full-bridge sub-module output negative voltage and other issues

Active Publication Date: 2017-11-28
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

This method is mainly aimed at the half-bridge MMC, and also does not consider the working condition that the hybrid MMC full-bridge sub-module can output negative voltage, and injecting high-frequency zero-sequence voltage and high-frequency current will increase the switching frequency of the switching device. Increase the loss of MMC to a certain extent

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  • Submodule capacitance voltage fluctuation suppression method of hybrid modular multilevel converter
  • Submodule capacitance voltage fluctuation suppression method of hybrid modular multilevel converter
  • Submodule capacitance voltage fluctuation suppression method of hybrid modular multilevel converter

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Such as figure 1 As shown, the hybrid modular multilevel converter of the present invention is composed of three-phase six bridge arms, each bridge arm includes a bridge arm inductor, and K series-connected full-bridge power modules FBSM 1 ,...,FBSM K , K≥1, K is generally not less than 55% of N, and (N-K) half-bridge modules HBSM connected in series K+1 ,...,HBSM N , N≥K≥1.

[0028] The hybrid modular multilevel converter sub-module capacitance voltage fluctuation suppression method of the present invention, when the hybrid modular multilevel converter is a rectifier, its control block diagram is as follows figure 2 As shown, when the hybrid modular multilevel converter is an inverter, its control block diagram is as follows image 3 shown, including the following steps:

[0029] (1) Calculate the amplitude of the circulating cur...

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Abstract

The invention relates to a submodule capacitance voltage fluctuation suppression method of a hybrid modular multilevel converter. The fluctuation suppression method comprises the step of generating amplitude which a circulation reference value is needed to be injected according to a modulation ratio of a converter, a power factor and a ratio value between an absolute value of maximum value of a bridge arm reference value negative electrode part and bridge arm maximum voltage; wherein the phases of the circulation reference values injected to a phase A, a phase B and a phase C are respectively 90 degrees, 210 degrees and -30 degrees when the converter is used a rectifier to run, and the phases of the circulation reference values injected to the phase A, the phase B and the phase C are respectively -90 degrees, 30 degrees and -210 degrees when the converter is used as an inverter to run. The corresponding reference voltage is generated by a closed-loop regulator, and the submodule capacitance voltage fluctuation of the hybrid modular multilevel converter is suppressed.

Description

technical field [0001] The invention relates to a method for suppressing capacitor voltage fluctuations of sub-modules of a hybrid modular multilevel converter. Background technique [0002] The voltage sourced converter high voltage direct current (VSC-HVDC) technology based on the voltage source converter has developed rapidly due to its higher flexibility and controllability. Modular multilevel converter (MMC) has greatly promoted the development of flexible HVDC transmission technology with its good harmonics and high reliability. [0003] In the field of overhead line DC transmission, the traditional MMC composed of half-bridge sub-modules does not have the ability to self-clear faults when a DC short-circuit fault occurs, and its application is greatly limited. Although the MMC composed of full-bridge sub-modules has a fault self-clearing capability when a DC short-circuit fault occurs, the cost and loss of the converter will also increase accordingly. In order to ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M1/12
CPCH02M1/12H02M7/483H02M1/123H02M7/4835
Inventor 赵聪李耀华王平李子欣高范强王哲
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI