模块化多电平换流器桥臂电流分析及其环流抑制方法

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模块化多电平换流器桥臂电流分析及其环流抑制方法

更新时间：2025-08-13

- 模块化多电平换流器桥臂电流分析及其环流抑制方法
- Automation of Electric Power Systems Vol. 38, Issue 24, Pages: 62-67(2014)
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- Published：2014
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[J]. Automation of electric power systems, 2014, 38(24): 62-67.
DOI：

[J]. Automation of electric power systems, 2014, 38(24): 62-67. DOI：

摘要

为了抑制模块化多电平换流器（MMC）内部环流，对MMC桥臂电压的波动和环流产生的机理进行了分析，提出了一种抑制环流的补偿控制方法。MMC在进行功率交换时，由于桥臂电流的作用，导致子模块电容电压发生周期性的变化，采用平均值的方法分析得出子模块电容电压包含直流分量和交流分量。采用最近电平调制法进行换流器电压调制，由于子模块电容电压含有直流分量以及基频分量偏差，导致桥臂电压与期望值间存在基频偏差和二倍频等分量，从而产生环流。通过对桥臂电压与期望值的偏差量进行补偿，能够消除桥臂电压的偏差，从而抑制换流器桥臂间的环流。在PSCAD/EMTDC中搭建了11电平MMC双端直流输电系统，仿真结果验证了所提方法的有效性

Abstract

In order to prevent the modular multilevel converter (MMC) internal circulation

an analysis is made of the voltage fluctuation and circulation generating mechanism of the MMC bridge arm

and a kind of compensation control method for circulation inhibition is proposed. When the MMC power exchange is in progress

the effect of bridge arm current causes the periodic change in the submodule capacitor voltage. It has found that submodule capacitor voltage contains DC component and AC component using the average value analysis method. For converter voltage modulation using the nearest level modulation method

it has been found that

as the submodule capacitor voltage contains DC component and fundamental component deviation

there exists fundamental frequency deviation and double frequency component between bridge arm voltage and the expected value

resulting in the circulation. By compensating for the bridge arm voltage and expected value deviation

it will be possible to eliminate bridge arm voltage deviation

thereby suppressing the circulation among the converter bridge arms. The 11-level MMC DC transmission system is set up in PSCAD/EMTDC

with the effectiveness of the method proposed verified by simulation results.

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Related Institution

State Key Laboratory of Renewable Energy Grid-integration (China Electric Power Research Institute)

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