Research On Dynamic Match And Control Strategy Of Fixed Wing Unmanned Aerial Vehicle With Multiple Power Sources

With the transportation widely used in the world,The demand of the more convenient,energy efficient vehicles was increasingly exposed.Many problems become imminent,such as: the global warming increasingly,the shortage of fossil energy,the emissions vehicle increasing.China accompanied with the number of general aviation aircraft increase,the above problem become seriously.So developed energy-saving,environment protection,new energy used of vehicles with great significance.With the document on deepening the reform of China's low altitude airspace management appearance,UAV industry as kind the new industry gradually into our sight,so multi power's unmanned aircraft came into being.This paper based on the development of domestic and foreign multi power UAV:refer to Czech production of "phoenix" powered glider as the prototype and learn from the successful experience of hybrid vehicle energy management.So puts forward the oil photoelectric multi power source unmanned aircraft concept,design of drive system's structure,match parameters and study control strategy are as follows:Through the comparative of the advantages of different structure with multi engine fixed wing aircraft driving system,then selected the parallel multi power driving system.With power demand for each flight profile is calculated,we could match the drive system components' parameters.The main components of multi power source driving system: aviation engine,motor,super capacitor,photovoltaic batteries,lithium batteries and other important parts of the simulation model were built in Simulink.The photovoltaic power generation system combined with MPPT control strategy to calculate the maximum power point of the solar constant optimization by controlling the DC-DC transformer circuit ? So the maximum power of the solar panels can be approximated by the maximum power to charge of the lithium battery pack.Researched on the instantaneous optimization control strategy of the aviation engine based on the logic threshold.Firstly,put aviation engine limited torque ?angular speed and the corresponding fuel consumption rate into the 3D map by the form of a curing in the controller.Secondly,identified the angular speed on the demand torque by the aviation engine performance curve,then divided the angular speed into several parts,though one by one to interpolate by optimization calculation method;Finally,get the minimum fuel consumption point as angular speed of the aviation engine.When the throttle became too low fastly or the aircraft's speed became too highly,using the method of fuzzy compensation to optimize the speed of the motor,so that the output of tension and the vehicle speed smoothly.Compared with the traditional power glider,the total fuel consumption is decreased by 10%.analyzed the rationality of the parallel multi power driving system upon the above strategy.Based on the above theoretical analysis,and improved the control strategy upon the test results.Simulation and experiment research show that the instantaneous optimization control strategy of the aviation engine based on the logic threshold and the method of fuzzy compensation to optimize the speed of the motor can effectively improve the working efficiency of the multi power drive system and reduce the fuel consumption in the same flight mission.