Output voltage modeling of cascaded H-bridge multilevel inverters under open-transistor fault

Raj, Nithin; Anand, Aniket; Jagadanand, G; George, Saly

doi:10.1109/ieacon.2016.8067347

Cited by 2 publications

(1 citation statement)

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“…However, the characteristics of open circuit faults are complex and not obvious [12]. Most modular converters can operate with open-circuit faults, but the quality of the output waveforms during operation with faults will decrease [13]. In severe cases, it may lead to secondary faults or even a shutdown.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Switch Based Adaptive Fault Ride-through Strategy for Power Quality Improvement Device

Shen¹,

Hu²,

Xiao

et al. 2021

Energies

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Cascaded H-bridge power quality improving device (PQID) has garnered extensive attention for its flexible electric energy conversion and fast voltage response. However, the failure rate of PQID is relatively high due to the use of large numbers of power electronic devices. This paper proposes a mechanical-switch based adaptive fault ride-through strategy for improving the operational stability and power supply reliability of PQID. According to the features of the topology and working principle of PQID, this paper summarized the types of internal faults and analyzed the characteristics of different types of faults. Based on the shortcomings of existing mechanical switches as a bypass method, corresponding adaptive fault ride-through strategies are proposed for different types of faults, and a comprehensive simulation test has been carried out. The results show that the proposed strategy can adaptively ride through unit faults and effectively improve the output waveform quality during the ride through time.

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Section: Introductionmentioning

confidence: 99%