Résumé: This article examines a new powertrain system for electric vehicles based on the dual-star induction machine, presented as a promising option due to its significant advantages in terms of performance, energy efficiency, and reliability. This system could play a key role in the [...] Read more. (This article belongs to the Special Issue Advanced Electrical Machine and Power Electronics for the Charging and Drive System of Electric Vehicles (EVs))

Résumé: This study employs an integrated methodology for the analysis and diagnosis of bearing faults in rotating machinery and wind turbine systems. The methodology begins by analyzing the original signal using Variational Mode Decomposition to extract distinct modes. Subsequently, the envelope is derived from the optimal mode and transformed into the frequency domain using Fast Fourier Transform to compute the envelope spectrum. The spectrum is segmented into specific frequency bands, and the energy within each band is quantified as features for training a K Nearest Neighbors classification model. The dataset is partitioned into training and testing subsets using cross-validation, and model performance is assessed using metrics such as accuracy and F1 score to ensure robust diagnostic capabilities. Comparative analysis of frequency spectra from real wind turbine signals highlights improvements in energy localization and distribution post-envelope processing. The proposed methodology is then applied to classify faults using the Case Western Reserve University dataset, demonstrating significant enhancements in diagnostic accuracy. These findings underscore the efficacy of the methodology in advancing fault diagnosis in complex machinery systems.

Résumé: Desert climate affects the durability of photovoltaic panels that leading to a drop in their lifetime. the following work reviews the failure modes and performance degradation of standard panels in Sahara Desert climate. The study carried out on several silicon cells after years fielded in Algeria Sahara. Visual inspection shows the influence of high temperature combined by high ultra violet. The review on failure mode and performance degradation in the paper could be used to assessing the accelerated lifetime of silicon solar cells in desert climate, in order to improve the standard photovoltaic panels performance in desert climate.

Résumé: In the paper, the main contribution is to understand the challenges related with operating silicon solar cells in Algerian Sahara, in order to improve the economical output of photovoltaic power systems. The evaluation consists the extraction of electrical parameters and visual observations. Tested PV modules have been subjected to extreme weather conditions for many years in field. Desert climate pose several challenges for the photovoltaic applications. The output power of solar cells drop up to 30 % compared to manufacturing status and physical material defects have mainly contribution in failure of polycrystalline solar cells in desert climate.

Résumé: Peak power tracking system Proteus model is proposed to design a maximum power point tracking techniques for photovoltaic systems. The simulator is good substitute to implement and verify the performance of MPPT algorithms in the laboratory. The proposed simulator has the same comportment as physical prototype. Simulated results of tracking voltage, tracking current and tracking power have been analyzed. The theoretical operation of the proposed model confirms the good performance even under solar irradiation variation.