Modeling And Simulation Of Satellite Power System Based On OpenModelica

The satellite power supply system is responsible for the energy supply of the satellite’s flight cycle and is one of the important components of the satellite.The working environment of satellite power supply is harsh,and modeling and simulation can improve the efficiency of satellite work and extend the working life.Aiming at the shortcomings of single input variables and low coupling degree in the current modeling and simulation of satellite power supply system,this paper uses Scilab/Xcos and OpenModelica to model and simulate the satellite power system.The main research work of the thesis is as follows:(1)To analyze the operating mode,operating principle and topology of energy transfer and bus regulation methods of the satellite power system,and to determine the basic composition of each module of the system.(2)For the typical satellite solar array-battery pack power supply system,according to the requirements of the system simulation function,the mathematical model and circuit model of the solar array,battery pack and power controller are given,and the corresponding simulation model is implemented in OpenModelica software;According to the two-body motion of the satellite,the principles of satellite orbit,attitude,space coordinate system and time coordinate system are analyzed,and the satellite orbit,attitude and solar model are realized in Scilab/Xcos,and finally the joint simulation is carried out through the FMI standard protocol.(3)Analyze the orbit and functional characteristics of communication satellites and remote sensing satellites,and design simulation schemes according to design requirements.The sub-model is used to build the corresponding satellite power system for system-level simulation.Enter the flight parameters of the satellite,consider the influence of light,electricity and heat on the system,and verify the dynamic characteristics of the system simulation.The satellite power supply system is constructed,and the power supply system of communication satellite and remote sensing satellite is simulated,and experimental results are obtained,which prove that the system designed in this paper meets the mission requirements in terms of energy distribution and energy balance.The research results can be used as a design reference for new satellite power supply systems and have certain engineering application value.