低轨道卫星蓄电池充电策略研究及在轨验证

蓄电池组作为低轨道卫星上重要的储能设备,其工作状态直接影响到整星工作的安全性和稳定性。而合理有效的充电策略和控制手段能够有效延缓蓄电池性能的衰降速度,延长其在轨使用寿命。指出了以往充电终止控制策略的局限性,并且在分析了低轨道卫星电源系统特点的基础上,提出了一种由电源下位机软件实现的阶段性限流充电控制策略,通过周期性地监测蓄电池的电量与转阶段门限值的大小,分别在软件限流控制步骤中对充电阵进行开启关闭控制。该方法通过软件实现,其中重要参数均可实现在轨上注调整,减小了以往充电过程中充电电流受负载变化引起的电压波动影响,增强了低轨道卫星蓄电池充电控制的灵活性和安全性,整个电源系统工作更加稳定,并通过在轨试验验证了其可行性,保证了蓄电池良好的工作状态。

Study of control strategy applicable for battery charging on low-orbit satellite

As the most important energy storage instrument on low-orbit satellite,the batteries' performance directly influence the security and stability of satellite,and appropriate control strategy for battenycharging could effectively delay the performance degrade of batteries which would prolong satellite's lifetime.The weakness of previous charging strategy was analyzed,on the base of the power supply system on low-orbit satellite,and a charging strategy of two stages current-limiting control realized by computer software was proposed,which could control the switching of charge during one or two stage of current-limiting control by comparing the current quantity of electricity and transfer stage threshold.The parameters of this method could be adjusted in orbit,which would diminish the impact of voltage fluctuations by load current change.The method enhances the flexibility and safety of charging control on low-orbit satellite.The whole power supple system works more stability than before,and the strategy is validated to be feasible through test on orbit.