Design of energy balance analysis system for space station

Combination is the development tendency of large spacecraft such as space station or space telescope system, of which the structure comes more and more complicated along with the expanding of functions. For power analysis of these complex combinations, firstly the working model of power system is founded. Then a special algorithm to calculate the power generated by solar arrays is proposed. Virtual vision method and spacecraft´s 3-D geometrical model are used here to solve the occlusion of sunlight between each spacecraft body and solar array. The other factors which influence the power of solar arrays are also list. Based on the models above, an energy balance system to calculate the states of power system is then set up. Finally, identification method of parameters in the model by spacecraft´s actual data in orbit is discussed. The simulation examples showed that the system´s precision is high enough and could dope out the trend of states in power system. The model and algorithm proposed in this paper have well engineering and researching value, which can be applied in general planning of combined spacecraft´s power system, as well as state monitoring and fault diagnosing during the spacecraft´s operation period.