卫星电源系统优化设计

对卫星电源系统进行总体优化设计是提高其可靠性和性能,减轻重量的一条重要途径。以太阳同步轨道卫星为背景,研究了太阳电池阵/蓄电池组联合电源系统的优化设计。包括以下内容:(1)轨道光照条件的计算方法;(2)研究了固定展开式、一个自由度对日定向式和两个自由度对日定向式等构型的太阳阵的最佳应用范围,建立了太阳阵的直流分析模型;(3)建立了蓄电池组的容量设计方法和直流分析模型,对蓄电池组的组成和充电方式,能量多圈平衡等问题进行了优化分析;(4)以太阳阵的输出功率为目标,对峰值功率跟踪(PPT)和直接能量传输(DET)两种太阳阵功率调节方式的应用范围进行了分析和比较。以电源系统的重量功率比最小为目标函数,对四种典型DET方式的电源系统配置方案进行了优化比较;(5)建立了以母线为核心的电源系统的交流小信号模型,导出母线阻抗,稳定性,瞬态响应和纹波的分析方法,对母线性能进行了优化设计;(6)对SEDSAT-1小卫星电源系统进行了仿真实验,部分验证了上述研究结果。本文的研究可用于电源系统总体设计的方案比较和方案优选过程。它将有助于定量地比较和优选电源系统设计方案,并实现降低重量功率比和提高性能的目的。

Optimization of Satellite Power System

Optimization of satellite power system is an important way to improve the reliability and the perfor-mance, and to reduce the weight. In terms of the sun synchronous orbit satellite, optimization of solar array/battery power system is studied. It includes the following contents: (1) The method of orbit illumination calculation is devel-oped. (2)The optimal using range is compared for the typical solar array configurations, the Fixed Deploying Array, the One Freedom Sun Tracking Array and the Two Freedom Sun Tracking Array. The solar array's DC model is built. (3) The battery's DC model is built. Three optimal design questions about battery are studied, such as bat-tery constitution, battery charging method and energy balance in multiple orbit periods. (4) A comparison is per-formed on the solar array output power between two kinds of solar power regulation method, Peal Power Tracking (PPT) and Direct Energy Transferring (DET). In regarding the weight power ratio as the objective function, four typical power system topologies of DET mode are also traded off. (5)The small signal AC moldels of the shunt, BCR and BDR connecting to the bus are developed. The equations and methods for computing the bus dynamic impedance, the stability, the ripple wave voltage and the transient time response are derived. The bus performance is optimized in an example. (6) The digital simulation and hardware in loop simulation of SEDSAT - 1 "s power sys-tem are conducted with the models and methods of this paper. The above research can be applied in the process of scheme trade-off of satellite power system design. It will be helpful for selecting the optimal power system design quantitatively, and reaching the aim of the weight reduction and the performance improvement.