An IGBT open-circuit fault detection method for modular multilevel converters
An IGBT open-circuit fault detection method for modular multilevel converters
复制标题
DOI：
10.1109/icpe.2015.7167986
复制
发表时间：
2015-06
期刊：
影响因子：
--
通讯作者：
Binbin Li;Yi Zhang;Rongfeng Yang;Gaolin Wang;Dianguo Xu
中科院分区：
文献类型：
--
作者：
Binbin Li;Yi Zhang;Rongfeng Yang;Gaolin Wang;Dianguo Xu
近年来，模块化多电平换流器(MMC)以其独特的特性受到越来越多的关注，尤其是在高压直流输电中的应用。MMC的最大特点之一是它由相同的低压子模块(SM)组成。因此，低压IGBT可以作为每个SM的主功率开关。然而，由于一个MMC站通常包含数百个短消息，IGBT成为最脆弱的元件。本文首先分析了同步电机中IGBT开路故障的故障特征。在此基础上，提出了一种基于观测器的IGBT开路检测方法，通过将估计值与实际采样值进行比较，可以准确地检测出故障。最后，基于实验室单相MMC样机的实验结果，验证了该故障检测方法的正确性和有效性。
Recently, the modular multilevel converter (MMC) has attracted increasing attentions due to its distinctive features, especially in the application of HVDC power transmission. One of the most significant characteristic of MMC is that it is composed of identical low-voltage submodules (SMs). As a result, the low-voltage IGBTs can be employed in each SM as the main power switch. However, since an MMC station usually contains hundreds of SMs, the IGBT becomes the most fragile component. In this paper, the failure characteristics of the IGBT open-circuit fault in a SM are firstly analyzed. Then, an observer-based IGBT open-circuit detection method is proposed, which can accurately detect the fault by comparing the estimated values with the actual sampled values. Finally, the validity and effectiveness of the proposed fault detection method are demonstrated by experimental results based on a single-phase MMC prototype in the laboratory.