采用电抗子模块分段投切的模块化多电平换流器降电容方法

LI Yu

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采用电抗子模块分段投切的模块化多电平换流器降电容方法

更新时间：2025-08-13

- 采用电抗子模块分段投切的模块化多电平换流器降电容方法
- Automation of Electric Power Systems Vol. 42, Issue 19, Pages: 90-97(2018)
- 作者机构：
  
  新能源电力系统国家重点实验室(华北电力大学),北京市,102206
- 作者简介：
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- Published：2018
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LI Yu. [J]. Automation of electric power systems, 2018, 42(19): 90-97.
DOI：

LI Yu. [J]. Automation of electric power systems, 2018, 42(19): 90-97. DOI：

摘要

模块化多电平换流器(MMC)子模块电容的电容电压波动使得电容值难以降低，阻碍了MMC换流阀轻型化的发展。在考虑了2次和4次相间环流的基础上，分析了子模块电容电压与桥臂电流相互影响的机理。为了降低子模块电容电压的波动水平，提出了一种以子模块形式分段投切桥臂电抗器的降容方法。分析了子模块电容电压波动的产生机理，分析了电抗子模块分段投切降容方法的原理，并设计了相应的控制策略。最后，在PSCAD/EMTDC仿真环境下搭建了双端基于MMC的高压直流(MMC-HVDC)模型，验证了所提降容策略的有效性，并与现有的环流抑制策略进行了对比分析。

Abstract

The fluctuation of the capacitor voltage of the modular multilevel converter(MMC)sub-module capacitor makes it difficult to reduce the capacitance value

which hinders the development of the light-weight MMC converter valve. Based on the consideration of the second and fourth inter-phase circulation

this paper analyzes the mechanism of interaction effect between that the sub-module capacitance voltage and the bridge arm current. In order to reduce the fluctuation level of the sub-module capacitor voltage

a control method for switching the bridge reactor in the form of submodule is proposed. The mechanism of capacitor voltage fluctuation of sub-module is analyzed. The principle of the reactor sub-module switching method is analyzed

and the control strategy of the method is designed. Finally

a two-terminal MMC based high-voltage direct current(MMC-HVDC)model is built under the PSCAD/EMTDC simulation environment to verify the effectiveness of the strategy proposed and compared with the existing circulation suppression strategy.

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