皮卫星在轨能量平衡仿真研究

针对浙江大学皮卫星由于输入能量条件差以及采用非调节母线和体装式结构,使其能量平衡计算相对于传统卫星更加复杂的特点和电源电路的特殊设计,对电源系统进行了建模. 通过实时计算太阳电池、蓄电池和负载的在轨工作参数以及分析实时的电流平衡、电压平衡和能量平衡,最终得到真实的能量平衡仿真模型. 对理想运行条件、实际环境条件和考虑卫星姿态失效的最差条件分别进行了仿真. 结果表明,在理想条件下可以完全保证整星能量平衡；在实际环境下最大平衡功率能忍受实际负载约10%的拉偏；在最差姿态条件下已几乎没有裕量,但能完全保证卫星安全模式下的负载功率能量平衡.

Study on simulation of on-orbit energy balance of pico-satellite

Considering that the computation of energy balance of the Zheda pico-satellite is more complex than that of conventional satellites due to its weak input energy and the use of the non-conditioning bus and the body-mounted structure, the power system was modeled based on the features of the pico-satellite and the specific design of the power circuit. The on-orbit running parameters of the solar array, the battery and the load were calculated in real time, and the real-time current balance, voltage balance and energy balance were analyzed, which lead to the practical simulation model of energy balance. Simulations of the ideal condition, the practical condition and the worst condition with the invalidation of the satellite attitude were made respectively. The results showed that the satellite can fully attain energy balance under the ideal condition and can tolerate 10% of the load power under the practical condition. Under the worst condition, the satellite had little margin of energy, but it can fully attain energy balance under the safe mode of the satellite.