太阳能飞机循环飞行的高度剖面能量策略

为满足设定的太阳能飞机多日连续飞行条件，依据飞行过程中当前时刻的飞行高度、光伏输出功率、动力电池组余量等系统状态参数，研究如何分配动力电池组充放电和电推进系统输入等功率。所用策略立足于实时功率平衡，充分利用正午前后的光伏峰值功率用于飞机爬升及充电，在午后下滑过程中利用全部光伏输出，以最大化利用光伏资源；在光伏有效输出不足时则以一定的维持功率下滑，使能量的综合损失最小。方法能够提高以预定夜间飞行高度连续多日续航的成功率，提升飞行高度、纬度、季节范围或搭载能力，或者拓展这几种飞行条件的组合域，优化太阳能飞机的适用性。

Energy strategy on altitude profile for cycle flight of solar powered aircraft

To satisfy the designated multi-day unintermittent flight of solar-powered aircraft, drawing on the in-situ system state parameters including altitude, photovoltaic power output, battery residual capacity, etc., a study on power allocation between power battery charging-and-discharging and electric-propulsion system input is carried out. Based on the real-time power balance, the adopted strategy maximizes the photovoltaic resource utilization by making the best of photovoltaic midday peak power to feed the climbing and charging in the meantime, and taking up total photovoltaic output to the postmeridian gliding. The strategy also minimizes the composite energy loss by maintaining the gliding at a stand-by power during the photovoltaic effective output shortage. The method can increase the mission success rate of multi-day unintermittent flight under the conditions of predefined night flight altitude, or enlarge the combination range of the flight altitude, latitude, date, and payload weight (or payload power-consumption), so as to optimize the adaptability of the solar-powered aircraft.