空间太阳能电站的准对日定向姿态

针对空间太阳能电站的俯仰姿态运动，提出一种能追踪太阳运动的准对日定向(QSP)姿态方案。此方案的太阳能电池阵列在万有引力梯度力矩的作用下，始终在垂直于太阳光的方向附近作幅值约为18.8°的振动，且几乎不需要姿态控制力矩。准对日定向姿态方案解决了大型太阳能电池阵列对日定向所需的巨大俯仰姿态控制力矩问题。准对日定向姿态的发电效率为对日定向姿态的97.3%，对Abacus空间太阳能电站而言每年可节省燃料约36791 kg。通过数值方法得到了准对日定向姿态的精确初始条件。随后，设计了比例-微分控制器，保证了系统存在初始姿态误差的条件下收敛到准对日定向姿态。最后研究了轨道、姿态和结构振动对准对日定向姿态的影响，并发现准对日定向姿态下的结构振动幅值比对日定向姿态减小约40倍。

Quasi Sun Pointing Oriented Attitude for Solar Power Satellites

A quasi-Sun-pointing (QSP) oriented attitude is proposed for pitch attitude motion of the solar power satellites, which can chase the movement of the Sun. With less control effort, the solar arrays oscillate around the direction perpendicular to the Sun under the influence of the gravity gradient torque, with the amplitude of 18.8°. The main contribution is solving the enormous pitch attitude control moment problem for the large solar arrays. The power generation efficiency of the QSP oriented attitude is 97.3% of that of the Sun-pointing attitude. However, it saves about 36791 kg fuel per year for the Abacus solar power satellite. The accurate initial attitude conditions of the QSP attitude are obtained through the numerical method. Then, a proportional-derivative controller is designed to guarantee the convergence of the QSP attitude. Finally, the effects of the orbital motion, attitude motion, and structural vibration on the QSP attitude are studied. It is found that the QSP oriented attitude also contributes to reduce the structural vibration of the solar arrays by about 40 times.