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In this paper several fault tolerant strategies which can be implemented on nine switch inverter has been investigated. The developed strategies provide compensation for open circuit and short circuit failures on semiconductor devices. In addition unique post fault controls have been proposed for each strategy. The first applied topology is switch redundant topology and can tolerate all switch failures...
Because of its great interest, the power systems reliability has been widely investigated in military, industrial and space applications. This paper is presenting an improved fault-tolerant inverter topology with its associated control strategy. This topology has been designed for aerospace industry that puts hard constraints on system reactivity and testability. In addition to the nominal and faulty...
The fault-tolerant design for any-level flying capacitor multilevel inverters is discussed in this paper, which is based on the novel combination scheme for flying capacitor multilevel inverters. When a power switch fault is detected in a single-phase, the same number of voltage levels can be maintained by reconfiguring the n-cell topology to a (n-1) cell topology. If two power switches in one same...
The power supply technology used in welding applications changed dramatically from manually tap-controlled 50 Hz bulky transformers which had large leakage inductance to provide stable arc burn to switch-mode fast controlled high-frequency power electronics. Nowadays, the typical converter configuration consist of a diode rectifier supplying via a large electrolytic capacitor a smooth DC-link voltage...
The reliability of the VSI (Voltage Source Inverter) components such as semi-conductor switches is critical for the shunt active power filters. A failure in one of the switches decreases system performances and usually leads to disconnect the filter. So, to prevent such undesirable events, real-time fault detection, isolation and compensation must be implemented. This paper proposes new robust fast...
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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