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A reliable multilevel inverter with fault tolerance is proposed. It consists of two sources and six switches. The unipolarity voltage level produced by the proposed inverter is transformed to dual polarity with the help of H-bridge. The proposed inverter produces maximum 9 levels output voltage with asymmetrical source and 5 levels output voltage with symmetrical source in healthy condition. During...
Multilevel inverters (MLIs) consist of increased number of power semiconductor devices for the generation of desired output voltage. As the number of components increases, the probability of fault due to power semiconductors increases drastically. Although the MLI topologies are in a matured state, the research in fault detection and diagnosis (FDD) in MLIs is still in a developing stage. This paper...
This paper presents an algorithm based on histogram of the inverter output voltage, to detect open switch fault in cross connected sources based multilevel inverter (CCS-MLI) topology. This topology requires less number of components as compared to classical topologies, but may have chances of switch failure. Here load voltage samples are analyzed using histogram pattern for the detection of fault...
This paper gives a solution to implement a self-diagnosis and tolerant control for a 3-level neutral point clamped inverter. Redundancies in semiconductor configurations are used to enable a continuous operation with a faulty power switch. The fault tolerance is obtained by using a SCR to substitute faulty switch. In case of failure events, the on-line diagnosis technique can fix faulty switch and...
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