Fault detection of switches in multilevel inverter using wavelet and neural network

Srivani, S. G.; Vyas, Ujjval B.

doi:10.1109/icpes.2017.8387284

Cited by 4 publications

(1 citation statement)

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“…In [17] a FDI scheme based on the mean voltages at each bridge has been studied. In [18,19], a combination of soft computing technique and a simplified rule based algorithm is adopted to detect an open-circuit fault in switches for symmetric operation of CHB-MLI. [20] proposes an optimization based neural network for development of FDI scheme for CHBMLI.…”

Section: Introductionmentioning

confidence: 99%

Fault detection technique for modified cascaded half-bridge multi-level inverter with polarity changer in pv grid system

Vyas

Shah

Srivani³

2021

SN Appl. Sci.

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Multilevel Inverters (MLI) are a viable option for a filter-less and transformerless photovoltaic system for direct grid integration, reducing losses, space and cost provided the issues of control and reliability are resolved. A modified cascaded half-bridge MLI with polarity changer is proposed with a reduced number of switches, thereby reducing control complexity. The proposed converter is designed for both seven-level and nine-level topologies. Selective harmonic elimination has been adopted to switch converter and the transcendental equations are solved by the gravitational search algorithm. The THD for nine-level configuration is 7.94% and 5.86% with MPPT and DC source inputs, respectively. The analysis on the open-circuit fault of switches confirms the presence of only five critical switches irrespective of the number of increase in levels, thereby requiring only five redundant switches at the Polarity Changer. The output voltage waveform is subjected to multiresolution analysis for feature extraction of voltages under various irradiance and temperature conditions. A conditions based fault detection algorithm is developed based on the observations of energies of signals to detect the open circuit fault in switches. Based on the comparative analysis, the proposed converter has fewer controlled switches for nine levels or higher configurations than other topologies. Apart from this, the high reliability due to inherent fault isolation capability restricted to half-bridge compared to different MLI topologies shows its superiority. For a nine-level MLI proposed topology reduces the cost considering redundancies for FDI in range of 67–30% depending on the topology for comparision. The system is simulated using MATLAB –Simulink and further validated by experimental results.

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