{'fraction_non_alphanumeric': 0.026519337016574586, 'fraction_numerical': 0.0, 'mean_word_length': 5.517985611510792, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Short-Circuit Fault Ride-Through of Flying-Capacitor Multilevel Converters through Rapid Fault Detection and Idle-mode Operation

Throughout the lifetime of a dc-ac converter, abnormal ac-side short-circuit conditions may occur as a result of external component failure, grid faults, or accumulation of moisture and dust. In such conditions, converter protection is needed. Compared to a two-level converter, which may be powered down if a fault is detected, the flying-capacitor multilevel converter cannot maintain voltage balance of the flying capacitors using such an approach. This paper therefore proposes methods for fault detection, and subsequent idle-mode fault ride-through, that protects the converter from device failures while supporting flying capacitor voltage balance. This method is experimentally verified under different operating conditions and various levels on a hardware prototype.