航空器中太阳能发电系统建模与能量流动控制

Modeling and Energy Flow Control of Solar Power Generation System in Aircraft

与地面太阳能发电系统相比,航空器中太阳能直流混合发电系统无大电网支撑,且系统常运行于离网模式,光照的变化对负载供电稳定性的威胁较大,对系统能量流动控制策略提出了更高的技术要求。针对以上问题,以为机载计算机等航电设备供电的太阳能直流混合发电系统为研究对象,阐述了系统的基本构成与关键技术,提出了一种简单的利用直流侧电压控制投切开关的方法,并在Matlab环境下建立了小功率混合发电系统模型,仿真了并/离网条件下系统的能量流动控制。仿真结果表明,最大功率跟踪控制与蓄电池充放电控制能有效工作,能量流动模式切换逻辑正常,负载供电稳定且满足标准要求,从而验证了上述搭建模型的正确性以及所提出控制方法的有效性。

Compared with the terrestrial solar power system, there is no support from large electric grid for the DC hybrid solar power system in aircraft, and it often operates in off - grid mode. The change in light intensity affects the stability of the power supplied to the load, which increases the technical requirements for energy flow control strategy of the system. This paper focuses on the DC hybrid solar power system which supplies electric power to avionic equip- ments such as airborne computer. The basic construction and key technologies of this system are presented, and a simple method is proposed which controls the switches based on the DC - side voltage. Furthermore, the simulation model of a low - power hybrid power system is built in Matlab, and the energy flow control of the system is simulated in grid - connected and off - grid operation modes. Simulation results show that the maximum power point tracking （MPPT） and the battery charging and discharging control work effectively, the mode switching logic of energy ex- change is reasonable. The power supplied to the load is stable and satisfies the requirements of certain standard, which verifies the correctness of the built simulation model and the effectiveness of the proposed control method.