Abstract
A single fault detection and location for Modular Multilevel Converter (MMC) is of great significance, as numbers of sub-modules (SMs) in MMC are connected in series. In this paper, a novel fault detection and location method is proposed for MMC in terms of the Insulated Gate Bipolar Translator (IGBT) short-circuit failure in SM. The characteristics of IGBT short-circuit failures are analyzed, based on which a Differential Comparison Low-Voltage Detection Method (DCLVDM) is proposed to detect the short-circuit fault. Lastly, the faulty IGBT is located based on the capacitor voltage of the faulty SM by Continuous Wavelet Transform (CWT). Simulations have been done in the simulation software PSCAD/EMTDC and the results confirm the validity and reliability of the proposed method.
Highlights
Modular multilevel converters (MMCs) have attracted extensive attention and research in high-voltage and high-power applications
A novel fault detection and location method is proposed for Insulated Gate Bipolar Translator (IGBT) short-circuit fault in MMC based on the SM capacitor voltage
The fault detection is carried out based on the proposed Differential Comparison Low-Voltage Detection Method (DCLVDM)
Summary
Modular multilevel converters (MMCs) have attracted extensive attention and research in high-voltage and high-power applications. Reference [15] changed the voltage measurement point to the cell output terminal for control purposes to avoid extra sensors, and detected the fault based on the unconformity between the output voltage and the switching signals. This method required a delay unit and a memory unit in every SM, which led to high cost and complexity. Reference [22] proposed a quick fault identification method in cascaded H-bridge multilevel converters through the comparison between the output voltage and the reference voltage of each phase. The simulation results confirm the effectiveness and reliability of the proposed method
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