Abstract:
Solar-powered UAVs use a revolutionary electric powertrain presented in this research. The Solong and Zyphyr airplane power supply systems inspired the proposed system structure. Similar to the Zyphry UAV, the proposed UAV type powers propellers with AC lines instead of DC lines.
Solar panels, a lithium sulfide battery energy management system, an inverter, AC bus-line, and active output filter comprise the proposed powertrain. AOF topology uses a small LC filter and a high-frequency H-bridge inverter.
By using an emulated series resistance with the H-bridge stage to ensure a perfect sinusoidal waveform of the line voltage, the AOF system minimizes power transmission system size and weight and increases conversion efficiency. To reduce non-linear load harmonics, this mimicked series resistance injects voltage across it.
A simulation model and experimental setup simulate and evaluate the proposed system under non-linear load conditions with closed-loop feed-back control. Active resistance compensation may provide high-quality sinusoidal line voltage waveforms with total harmonic distortion factor less than 3%, according to simulation and experimental data.
Power losses analysis and conversion efficiency calculation of the proposed system are compared to the traditional three-phase PWM inverter, showing a 31% reduction in power losses.
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