ABSTRACT:
This
paper presents a new electric power train for solar powered unmanned aerial
vehicle (UAV). The proposed system structure is based on the development of the
power supply system for both the So long and Zyphyr aircraft models. The
proposed UAV model incorporates the Zyphry UAV use of an AC line feeder instead
of DC power lines to power the propellers. The proposed power train includes
solar panels, an energy management system based on lithium sulfide battery,
inverter, AC bus-line and active output filter (AOF). AOF topology is composed
of a high switching frequency H-bridge inverter with a reduced size LC filter.
The utilization of AOF system reduces the size and weight of the power
transmission system and significantly improves its conversion efficiency by
introducing an emulated series resistance with the H-bridge stage to ensure
high quality pure sinusoidal waveform of the line voltage. This emulated series
resistance produces an injected voltage across it to diminish unwanted
harmonics created from the non-linear load. A simulation model and experimental
setup are created to simulate the proposed system and the system is tested
under non-linear load condition with closed-loop feed-back control strategy.
The obtained simulation and experimental results demonstrate that high-quality
sinusoidal line voltage waveforms can be obtained using the active resistance
compensation technique with total harmonic distortion factor less than 3%.
Moreover, power losses analysis and conversion efficiency calculation of the
proposed system are performed and compared with that of the conventional
three-phase PWM inverter, which proved that the power losses are reduced by
31%.
KEYWORDS:
1. Active
output filter
2. Active
resistance compensation
3. Loss
analysis
4. Non-linear load
5. Solar powered
6. Unmanned
aerial vehicle
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Figure 1. Proposed Solar Powered Uav And Aof, (A)
Single-Phase Square Wave Inverter With Ac-Bus Line And (B) Three-Phase Six-Step
Inverter With Ac-Bus Line.
EXPECTED SIMULATION RESULTS:
Figure 2. Tested Insolation Conditions For Uav Pv
Power System.
Figure 3. Pv Harvested Power.
Figure 4. Pv Voltage (Upper Trace) And Current
(Low Trace).
Figure 5. Battery Power.
Figure 6. Non-Linear Load Output Dc Power.
Figure 7. Pv Harvested Power During Different
Operating Modes.
CONCLUSION:
A
new electric power generation system for solar powered unmanned aerial vehicle
(UAV) using active output filter has been proposed and investigated in this
paper. The proposed power generation system is a potential progress of both the
Solong and Zyphyr UAV models using the AC-bus line instead of the DC-bus line
to power the propellers. It includes solar PV system, lithium-sulfur based
power management system, inverter, AC bus-line. Balanced DC-link voltages of AOF
have been accomplished using closed loop control of active resistance
compensation, which produces an injected voltage across it to diminish unwanted
harmonics created from the non-linear load. The obtained simulation and
experimental results and the voltage and current waveforms demonstrated the
viability and the correctness of the proposed power generation system. The
proposed active resistance compensation ensures a high-quality sinusoidal line
voltage with total harmonic distortion less than 3%. Moreover, power loss analysis
and conversion efficiency of the proposed system are performed and compared
with that of the conventional three-phase PWM inverter. The obtained results
proved that the power loss is reduced by 31%. More investigation of the proposed
AOF for large-scale PV plants application with Battery energy management system
integration using different wide band gab devices to optimize the system efficiency
are required with applying different PWM techniques to utilize the passive
elements sizing design which are the subject of future work.
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