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2025-04-24
PIER C
Vol. 155, 19-28, 2025
download: 10
Minimum-Current-Stress Strategy for Modular Multilevel Type DC-DC Converter Based on Long Short-Term Memory Optimization
Dazhuan Yu, Xin Chow, Zefeng Lin and Xiaobing Niu
Current stress has a significant impact on the operation of power electronic devices, and the reduction of current stress can improve the safety and reliability of the system. First, this paper proposes a novel asymmetric duty cycle modulation strategy for the primary side of a modular multilevel type (MMC) dual active bridge converter (DAB) to increase the control freedom of the primary side. Secondly, a novel optimization strategy based on a long-short-term memory network (LSTM) classification is proposed in this paper to optimize the current stress. The output power of the system is classified by LSTM,and minimum current stresses at different powers are optimized by a novel meta-heuristic iterative optimization based on generalized quadratic interpolation (GQI). Finally, the feasibility of the scheme is verified by hardware-in-the-loop experiments.
Minimum-current-stress Strategy for Modular Multilevel Type DC-DC Converter Based on Long Short-term Memory Optimization
2025-04-23
PIER C
Vol. 155, 11-18, 2025
download: 16
Integrated Generator Design for Double Stator Hybrid Excitation Flux Switching Machine
Nur Afiqah Mostaman, Erwan Bin Sulaiman, Mahyuzie Jenal and Irfan Ali Soomro
Double Stator Hybrid Excitation Flux Switching Generator (DS-HEFSG) has attracted significant interest in power-generating research owing to its potential for improved performance and sustainability. This research examines the utilization of hybrid excitation to enhance the efficiency of a three-phase DS-HEFSG specifically engineered for low-speed power applications such as renewable energy systems like wind and tidal turbines. The innovative method presents a double stator hybrid configuration for a traditional double stator generator, with performance evaluation performed via 2D finite element simulations. The findings indicate that the DS-HEFSG surpasses traditional topologies, rendering it an optimal selection for this generator configuration. The proposed design significantly increases the 18.76% cogging torque value while the electromotive force increases by approximately 21.62%. The proposed design also decreases permanent magnet eddy-current losses by 24.33%. Enhanced performance is noted in electromagnetic torque, torque ripple, output power, and overall efficiency. These advancements contribute to energy savings and lower maintenance costs, reducing reliance on fossil fuels and supporting the transition to greener energy solutions. The proposed DS-HEFSG with hybrid excitation is a viable alternative for efficient low-speed power production.
Integrated Generator Design for Double Stator Hybrid Excitation Flux Switching Machine
2025-04-22
PIER C
Vol. 155, 1-9, 2025
download: 22
Ternary B2O3-TeO2 -BaO Glass as a Shielding Case
Samar M. Ibrahim, Yara Abdelghany, Maged M. Kassab, Mostafa M. Radwan and Ahmed Abdel-Latif M
This study investigates the properties of a ternary B2O3-TeO2-BaO glass system, prepared through the melt-quenched technique. The chemical formula used is (50 - x/2)B2O3 + (50 - x/2)TeO2 + xBaO, with x varying from 15 to 35 mol.%. The research explores how the gamma and neutron radiation shielding capabilities were analyzed. It finds that higher BaO content enhances gamma-ray shielding but does not significantly affect neutron shielding. The glass sample BTB35 emerged as the optimized candidate among the developed samples for gamma radiation shielding applications. Also, the obtained results for the MFP was compared to commercial shielding glasses, and other measurements on glasses show the superiority of BTB35 as commercial transparent radiation shielding glass.
Ternary B2O3-TeO2-BaO Glass as a Shielding Case