卫星电源系统是星上产生、贮存、变换、调节和分配电能的系统，它为卫星各个分系统的设备提供安全可靠的电源供给，是卫星必不可少的重要保障系统。电源系统的研发经费在整个卫星研发经费中占据的比重也很可观，因此，为了提高电源系统的性能和可靠性，对卫星电源系统进行全面的测试和评估具有十分重要的意义。为了较为真实的反映卫星在空间中工作的情况，本文对星上实际的电源系统进行了深入研究，并通过软硬件结合的方式，设计了一套完整的半实物电源仿真系统实施方案，并对模拟器中的各个部件进行了详细的设计和部分实验。卫星电源系统中最重要的供能部分是太阳能电池阵，本文根据太阳能电池单体的数学模型，利用简单的模拟器件设计了电池单体的I-V特性曲线生成电路，实验结果表明该电路输出的I-V特性曲线能很好的满足实际太阳能电池单体的特性。在电池单体实验的基础上，本文进一步对太阳能电池阵列，分流调节器等进行了研究，通过仿真和实验，证明了太阳能电池阵模拟器设计的可行性。卫星电源系统中另一个重要部件就是蓄电池，本文对蓄电池模拟器进行了数学建模仿真，仿真结果表明该模型能够很好的与星上实际参数相吻合。基于数学仿真的结果，本文还对蓄电池模拟器的半实物模型及相关的充放电电路进行了设计，以满足电源分系统的设计要求。本文对电源模拟器中的仿真电源控制器模块及二次电源模块进行了设计，为系统的可靠运行提供了保证。以卫星电源仿真系统作为测试平台，今后可以与其他分系统进行互联，进而支持其他分系统的仿真和测试，为未来卫星研制中改进电源分系统设计提供仿真和试验研究的支持平台。

The power system is one of the most important parts of the satellite. It is used to generate, stockpile, transform, adjust and distribute the energy for the satellite. The power system provides electrical energy for other equipments on the safe side. The expense of power system is at high rate of the whole satellite. In order to enhance the power system’s performance and reliability, testing and evaluating the satellite power system becomes very indispensable. In this paper, software and hardware are combined to accomplish the whole design of the satellite power system simulator. And more, this paper gives some detailed designs and experiments for several parts of the simulator.In the satellite power system, the most important part of the power supply is the Solar Array. Based on the solar cell’s mathematical module, this paper designs a cell simulator circuit which can generate the I-V curves of the actual solar cell by using only some analog component. Experiments show that the simulator can accurately simulate the characters of solar cell. Utilizing the solar cell simulator, this paper has do some research on the solar array and the shunt switching unit. The simulation and experiment results proved the feasibility of the simulator design. Another part of the satellite power system is battery. The mathematic module of the battery simulator is built in this paper. The simulation results of the module can accurately response to the actual satellite battery. At last, the design of the battery charging and discharging simulator hardware is also proposed.For the stability of the power system’s functions, the power controller simulator and the second power model are needed. This paper gives the detailed design of these two parts.On the platform of the satellite power system simulator, we can do more tests with the other satellite sub-system. The simulator can provide the testbed for the development of future satellite power system.