模块化多电平换流器子模块故障冗余容错控制策略

HU Pengfei

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模块化多电平换流器子模块故障冗余容错控制策略

更新时间：2025-08-13

- 模块化多电平换流器子模块故障冗余容错控制策略
- Automation of Electric Power Systems Vol. 37, Issue 15, Pages: 66-70(2013)
- 作者机构：
  
  浙江大学电气工程学院,浙江省,杭州市,310027
- 作者简介：
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- Published：2013
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HU Pengfei. [J]. Automation of electric power systems, 2013, 37(15): 66-70.
DOI：

HU Pengfei. [J]. Automation of electric power systems, 2013, 37(15): 66-70. DOI：

摘要

阐述了模块化多电平换流器（MMC）子模块故障类型，包括绝缘栅双极型晶体管（IGBT）模块故障、直流电容故障和控制信号故障。分析比较了3种子模块冗余容错方案的优缺点，选择采用对MMC影响较小的子模块热备用的冗余容错方案。该方案的缺点是MMC运行于不对称状态，导致MMC直流电流出现波动。为此，在推导MMC冗余运行状态的基本数学模型、得出桥臂能量数学表达式的基础上，提出了基于桥臂能量平衡的冗余容错控制策略来抑制直流电流的波动。在时域仿真软件PSCAD/EMTDC中搭建了61电平MMC模型，仿真结果验证了提出的冗余容错控制策略的有效性。

Abstract

Sub-module fault types of modular multilevel converters（MMCs）are explained，including insulated gate bipolar translator（IGBT）module fault，fault of capacitor in DC link and control signal.Advantages and disadvantages of three redundancy fault-tolerated schemes of sub-module are analyzed.One scheme with sub-modules in hot standby is adopted，which has small impact on MMC.The drawback of this scheme is DC currents fluctuation presenting when MMC operates under unsymmetrical condition.Thus，based on derived basic math model of MMC under redundancy operation condition and yielded arm-energy math expressions，a redundancy fault-tolerated control strategy based on energy balance of arms is proposed to suppress the fluctuation of DC currents.A61voltage-level MMC simulation model is set up in PSCAD/EMTDC.Simulation results verify the validation of the proposed redundancy fault-tolerated control strategy.

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