Open-Switch Fault Detection and Isolation for a Dual-T-type Multilevel Inverter Utilizing a Matched Filter Bank

This paper proposes an advanced technique for open switch fault of a dual T-type multilevel converters. The technique could detect and isolate the fault of the three phases switches, 24 switches here, using a single voltage sensor. Additionally, this technique is one that can be implemented at low cost with contemporary DSP applicable technology and is able to detect and isolate a single switch fault, when one occurs, using samples of the waveform alone. The technique shows that the crest factor is ≈ 26dB if we oversample by a factor of 200 the PWM generated waveform (with respect to the Nyquist Rate for a 60Hz Source). The results show that the technique is fact enough to detect and isolate the fault in a single voltage cycle.