The transmitting antenna needs to be oriented to the Earth, while the PV cell array of the SSPS-OMEGA system rotates in a large range inside the concentrator for the orientation to the Sun, so that there is a large range of unfixed relative movement among the subsystems. For the study of dynamic characteristics and attitude control problem of the space solar power satellite, the multi-body dynamics model of the system is built, and the gravity gradient torque equation applied on the PV cell array is derived in the process of relative motion. A simple attitude control system and the corresponding electric thrusters configuration scheme are designed. The simulation results show that the attitude of 2-GW SSPS-OMEGA in roll and yaw direction is well controlled. However, due to the large range rotation of the PV cell array, the attitude in the pitch direction is controlled to converge to the microwave beam pointing accuracy of mechanical adjustment in longer time with the residual gravity gradient torque. In the long period, the attitude deviation angle in the pitch direction would stabilize periodically within ±0.018 degree. This provides a reference for further study of beam-control of the transmitting antenna.

发射天线需要对准地球，而SSPS-OMEGA系统的PV电池阵列会在集中器内部大范围旋转，以对准太阳，因此，在太阳之间存在大范围的不固定相对运动子系统。为了研究空间太阳能卫星的动态特性和姿态控制问题，建立了系统的多体动力学模型，并在相对运动过程中推导了应用于光伏电池阵列的重力梯度转矩方程。设计了一种简单的姿态控制系统和相应的电动推进器配置方案。仿真结果表明，2-GW SSPS-OMEGA在侧倾和偏航方向上的姿态得到了很好的控制。但是，由于PV电池阵列的旋转范围较大，控制俯仰方向上的姿态，使其在较长时间内收敛于具有残余重力梯度转矩的机械调整的微波波束指向精度。在长时期内，俯仰方向上的姿态偏离角将周期性地稳定在±0.018度内。这为进一步研究发射天线的波束控制提供了参考。