A level adjustment–based fault‐tolerant control strategy for hybrid MMC

A level adjustment–based fault‐tolerant control strategy for hybrid MMC
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基于电平调整的混合MMC容错控制策略

DOI:
10.1002/2050-7038.12963
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发表时间:
2021-05
影响因子:
2.3
通讯作者:
Jianlong Chen
Jianlong Chen
中科院分区:
工程技术4区
文献类型:
--
作者:
Yiqi Liu;Yonglin Jin;Jun Zhang;Yanchao Liu;Jianlong Chen

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混合模块化多电平换流器(HMMC)具有直流故障穿越能力和较低的成本,是一种很有前途的高压直流输电(HVDC)拓扑。然而,具有大量和不同类型的子模块(SM)的HMMC的复杂配置增加了子模块故障的风险。本文提出了一种新的HMMC子模块容错策略,通过调整故障相的插入SM的数量。然后,在分析同步电压波动的基础上,设计了与容错策略相匹配的同步电容电压控制器。通过利用负电压输出全桥子模块(FBSM),该策略可以显著提高HMMC的SM容错能力。此外,与传统的容错策略相比,所提出的策略需要更少的组件,可以很容易地实现。最后,通过MATLAB/Simulink仿真实验,在不同故障条件和MMC系统下验证了所提策略的可行性和性能。
With the capability of DC fault ride‐through and the reduced cost, the hybrid modular multilevel converter (HMMC) is a promising topology for high‐voltage direct current (HVDC) applications. However, the complicated configuration of HMMCs with a large number and different types of submodules (SM) increases the risk of submodule failure. This paper proposes a novel HMMC submodule fault‐tolerant strategy by adjusting the number of inserted SMs of faulty phases. Then, based on the analysis of the SM voltage fluctuation, an SM capacitor voltage controller matched in coordination with the fault‐tolerant strategy is designed. By utilizing the negative voltage output full‐bridge submodules (FBSMs), this strategy can significantly improve the SM fault‐tolerant capability of the HMMC. Moreover, as compared to conventional fault‐tolerant strategies, the proposed strategy requires fewer components and can be easily implemented. Finally, the feasibility and performance of the proposed strategy are verified by the MATLAB/Simulink simulation experiment under different fault conditions and MMC systems.
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