Loop current inhibition method suitable for modular multilevel converter

A modular multi-level, circulating current suppression technology, applied in the field of power transmission and distribution, can solve problems such as cumbersome calculation process

Inactive Publication Date: 2017-01-25
CHONGQING UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature [7] proposed a MMC circulation suppression method based on variable sub-module capacitor voltage reference value. This method needs to calculate the instantaneous power of all bridge arms

Method used

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  • Loop current inhibition method suitable for modular multilevel converter
  • Loop current inhibition method suitable for modular multilevel converter
  • Loop current inhibition method suitable for modular multilevel converter

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The present invention is suitable for the circulating current suppression method of the modularized multilevel converter, wherein the topological structure of the MMC is as follows figure 1 As shown, the upper and lower bridge arms of each phase of MMC are composed of n sub-modules (SM) and a bridge reactor L 0 Composed in series, its sub-modules mainly include three topologies: half-bridge, full-bridge and clamped twin sub-modules.

[0032] Taking the three-phase MMC system as an example, where figure 2 It is a control block diagram of the MMC system adopting the cross-coupling circulation suppression strategy of the present invention. The MMC converter station adopts hierarchical control, in which the station-level control is responsible for receiving system scheduling instructions, such as figure 2 Active power P in * ...

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Abstract

The invention discloses a loop current inhibition method suitable for a modular multilevel converter. The loop current inhibition method includes that loop current inside the modular multilevel converter (MMC) is separated from detected bridge arm current through frequency-doubled negative sequence rotation coordinate conversion, and a cross coupling novel control mode is adopted to realize quick inhibition of frequency-doubled loop current inside the MMC, so that capacitor voltage fluctuation of an MMC submodule can be effectively reduced, and stability and overall running performance of an MMC system can be improved.

Description

technical field [0001] The invention relates to flexible direct current transmission and distribution of power systems, in particular to a method for suppressing circulating currents of modular multilevel converters, and belongs to the technical field of power transmission and distribution. Background technique [0002] Modular Multilevel Convener (MMC) effectively avoids the dynamic voltage equalization problem caused by the withstand voltage of a single power electronic device and multiple direct series use. Compared with the traditional two-level and three-level conversion MMC can flexibly expand to high voltage and high power by increasing the number of sub-modules, can work at a lower switching frequency, has high conversion efficiency, small voltage and current peaks, and very low output voltage harmonic content And other advantages, making it very suitable for flexible direct current transmission and other occasions of high-voltage and high-power electric energy conve...

Claims

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Application Information

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IPC IPC(8): H02M7/5387
CPCH02M7/5387
Inventor 姚骏谭义程涛
Owner CHONGQING UNIV
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