MMC (modular multilevel converter) sub-module capacitor voltage fluctuation suppression method with harmonic coupling injection

A capacitor voltage and fluctuation suppression technology, applied in electrical components, output power conversion devices, etc., can solve problems such as cost can not be ignored, large capacitor volume, etc., to reduce design requirements, reduce voltage fluctuations, and achieve the effect of lightening

Inactive Publication Date: 2019-07-23
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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  • Abstract
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  • Application Information

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Problems solved by technology

At the same time, compared with the traditional DC transmission converter, the hybrid modular multilevel converter of the same capacity level has a larger capacitor volume, so the cost cannot be ignored

Method used

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  • MMC (modular multilevel converter) sub-module capacitor voltage fluctuation suppression method with harmonic coupling injection
  • MMC (modular multilevel converter) sub-module capacitor voltage fluctuation suppression method with harmonic coupling injection
  • MMC (modular multilevel converter) sub-module capacitor voltage fluctuation suppression method with harmonic coupling injection

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Embodiment Construction

[0055] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0056] An embodiment of the present invention provides a method for suppressing voltage fluctuations in the sub-modules of a modular multilevel converter based on harmonic coupling injection. The specific flow chart is as follows figure 1 As shown, the specific process is as follows:

[0057] S101: According to the analysis result of the instantaneous power of the bridge arm, determine the amplitude and phase of the double-frequency current and the triple-frequency voltage injection;

[0058] S102: Determine the voltage correction amount corresponding to the triple frequency voltage and the double frequency circulating current superimposed on the modulation wave according to the injected amplitude and phase of the double frequency current and the triple frequency voltage;

[0059] S103: Determine the modulated wave voltage of the modular multilevel converter...

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Abstract

The invention provides a MMC (modular multilevel converter) sub-module capacitor voltage fluctuation suppression method with harmonic coupling injection. The method comprises the following steps: inhibition of fundamental frequency and second harmonic generation fluctuation components of bridge arm instantaneous power is taken as a target; the injection amounts of the second harmonic generation loop current and the third harmonic generation voltage are optimally designed; and finally, the calculated second harmonic generation ring current and third harmonic generation voltage are injected intothe three phases through an injection controller, so that the voltage fluctuation of a sub-module capacitor of a whole converter valve is reduced, the requirement on the capacitance value of the sub-module capacitor is reduced, the size and the cost of the sub-module capacitor are reduced, and the light weight of the modular multilevel converter is favorably realized.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a method for suppressing fluctuations in capacitor voltage of a sub-module of a modular multilevel converter with harmonic coupling injection. Background technique [0002] Flexible direct current transmission (VSC-HVDC) is a new generation of direct current transmission technology after alternating current and conventional direct current transmission. Flexible DC transmission technology has the characteristics of independent adjustment of active power and reactive power, strong weak grid access and low voltage ride-through capabilities, low AC filtering and reactive power compensation requirements, etc. Modular multilevel converter (MMC) has the advantages of modularization, low switching frequency, low harmonic content and easy redundant configuration. Compared with the level voltage source converter, it has a wider range of application scenarios. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0038
Inventor 赵成勇陆锋李钰屈海涛黄金魁许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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