Abstract
Recent research has focused on sustainable development and renewable energy resources, thus motivating nonconventional cutting-edge technology development. Multilevel inverters are cost-efficient devices with IGBT switches that can be used in ac power applications with reduced harmonics. They are widely used in the power electronics industry. However, under extreme stress, the IGBT switches can experience a fault, which can lead to undesirable operation. There is a need for a reliable system for detecting switch faults. This paper proposes a signal processing method to detect open-circuit problems in IGBT switches. Relative wavelet energy has been used as a feature for a machine learning algorithm to diagnose and classify the faulted switches. The switching sequence can be altered to restore a healthy output voltage. Inverter faults have been diagnosed by using support vector machine (SVM) and decision tree (DT), and an ensemble model based on decision tree (DT) and XG boost algorithm was developed, which yielded 92%, 88%, and 94.12% accuracy, respectively.
Highlights
A surge in the development of renewable energy resources has made it crucial to supply high-quality electrical energy to various electrical loads
Various multilevel inverter topologies have been proposed in the literature, such as the PUC5 topology [1,2,3,4,5,6,7,8,9,10,11,12,13], which was introduced to provide good quality power and reduce the number of components compared to its predecessors
This paper presented a robust approach to fault diagnosis in multilevel inverters using sub-band relative wavelet energies as features with machine learning algorithms for classification
Summary
A surge in the development of renewable energy resources has made it crucial to supply high-quality electrical energy to various electrical loads. Renewable power is increasingly being converted into grid-compatible and standalone forms by power converters. The DC–AC converters, called inverters, are used to convert the DC power produces by the solar PV generation system into AC power that is fed to the grid or used for industrial applications. Various multilevel inverter topologies have been proposed in the literature, such as the PUC5 topology [1,2,3,4,5,6,7,8,9,10,11,12,13], which was introduced to provide good quality power and reduce the number of components compared to its predecessors. Insulated gate bipolar transistors (IGBT) are typically used as power switches in multilevel inverters due to their high voltage and current ratings
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