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首页> 外文期刊>IEEE Transactions on Industrial Electronics >Fault Diagnosis and Monitoring of Modular Multilevel Converter With Fast Response of Voltage Sensors
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Fault Diagnosis and Monitoring of Modular Multilevel Converter With Fast Response of Voltage Sensors

机译：电压传感器快速响应模块化多电平转换器的故障诊断与监控

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摘要

Modular multilevel converter (MMC) has been one of the most popular candidates in high-voltage applications. However, reliability is a critical issue due to a large number of power switching devices and capacitors applied in the MMC. To improve the reliability of the MMC, a fast and reliable diagnosis strategy for the open-circuit fault is proposed in this paper, where submodule voltage sensors are relocated to the upper switching device. Furthermore, a voltage observer based on the submodule voltage sensor is established to monitor the capacitor and realize the power control of the MMC under normal operation. A Boolean logic operation based fault indicator is put forward based on the relationship of the operation state and binaried output of voltage sensors, which could detect and locate the open-circuit faults of the MMC very fast. The ratio of the increment of the observed and measured capacitor voltage during the period of positive arm current is applied to monitor the capacitor. The effectiveness of the proposed fault diagnosis strategy and the capacitor monitoring strategy is verified by the experiment results.
机译：模块化多级转换器（MMC）是高压应用中最受欢迎的候选者之一。然而，由于在MMC中应用了大量的电力开关装置和电容器，可靠性是一个关键问题。为了提高MMC的可靠性，本文提出了一种快速可靠的开路故障诊断策略，其中子模块电压传感器被重新定位到上开关装置。此外，建立基于子模块电压传感器的电压观测器来监视电容器并在正常操作下实现MMC的功率控制。基于电压传感器的操作状态和二分量输出的关系提出了一种基于布尔逻辑操作的故障指示器，这可能会非常快地检测和定位MMC的开路故障。应用了在正臂电流周期期间观察和测量电容器电压的增量的比率用于监测电容器。实验结果验证了所提出的故障诊断策略和电容器监测策略的有效性。

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