航天器并行能量处理S3R架构分流器研究

Parallel Power Processing of Aerospace Craft Solar Array Shunt Based on S^3R

针对顺序开关分流器(S^3R)电源系统在高太阳能电池寄生电容、高单阵电流及高母线电压应用中的高开关频率、高损耗问题,基于S^3R控制思想将太阳能电池阵分为大电流、小电流两种类型,进而实现太阳能电池的并行能量处理。对控制器进行了改进,使小电流太阳能电池阵列处于开关状态来调节母线,大电流太阳能电池阵列仅工作在分流或供电两种状态。在同样的母线输出特性情况下,降低开关调节路分流器的开关损耗,进而降低热耗,削弱太阳能电池寄生电容对系统的影响。

With respect to the sequential switching shunt regulator（S3R） architecture applying into high solar array parasitic capacitance, high section current and high bus voltage situation, some drawbacks like high switching frequen- cy and large power dissipation will be caused.Based on the control idea of S3R,a parallel power processing control method is proposed ,where the solar array sections will be divided into small current sections and large current see- tions.The main controller of the power system is designed to make the small current section shunt regulator adjust the main bus voltage, and the large current shunt regulators work only in shunt or supply mode.In this way, the main bus voltage will always be regulated by the small current shunt regulator, which will reduce the switching frequency of MOSFET in shunt path, thus the power dissipation will be reduced too, so the negative influence of parasitic capaci- tance in S3R will be alleviated.