The new type of L-LLC resonant bidirectional DC-DC converter (L-LLC-BDC) has merits high efficiency, high-power density and wide gain power ranges, it is suitable for energy interface between storage systems DC micro grid. However, the resonances are sensitive to parasitic parameters, which will deteriorate efficiency. This paper investigates intrinsic mechanism parameters on L-LLC-BDC operatin...

Design of blast resistant structures is an important subject in structural engineering, attracting the attention of governments, researchers, and engineers. Thus, given the benefits of optimization in engineering, development and assessment of optimization methods for optimum design of structures against blast is of great importance. In this research, multi-objective optimization of steel momen...

This paper presents a novel control method to improve the efficiency of low-voltage DC-DC converters at light loads. Pulse Width Modulation (PWM) converters have poor efficiencies at light loads, while pulse frequency modulation (PFM) control is more efficient for the same cases. Switching losses constitute a major portion of the total power loss at light loads. To decrease the switching losses...

The objective of this study is to analyze feeder loss minimization and load balance under given constrains. Effective methods are required for switching/reconfiguration. Feeder switching a mixed-integer large-scale combinatorial problem optimization, not easily solvable with classical optimization techniques, especially involving great number switches. This paper proposes fuzzy indexing algorit...

In order to reduce fuel consumption and the deviation between final battery state-of-charge (SOC) value target at same time, a novel double-layer multi-objective optimization method is proposed, which adopts an improved ant colony (ACO) algorithm equivalent minimization strategy (ECMS) considering mode switching. The proposed two-layer structure. inner layer, ECMS switching was adopted optimize...

This paper recommends the use of grasshopper optimization algorithm (GOA), a nature-inspired algorithm, for optimizing switching-angle applied to cascaded H-bridge multilevel inverter (CHBMLI). Switching angles are selected based on minimum value objective function formulated using concept selective harmonic minimization pulse width modulation (SHMPWM) technique. MATLAB/Simulink-PSIM dynamic co...

One of the difficulties with PWM switching converters is high switching loss and electromagnetic interference due to switching at non-zero voltage and current, which limits the operating frequency. In order to reduce the converter volume and weight (by increasing the frequency) and reducing switching losses, zero voltage and current switching methods are recommended. In this paper, four main ze...

One of the difficulties with PWM switching converters is high switching loss and electromagnetic interference due to switching at non-zero voltage and current, which limits the operating frequency. In order to reduce the converter volume and weight (by increasing the frequency) and reducing switching losses, zero voltage and current switching methods are recommended. In this paper, four main ze...