The Study Of The Power System And The Ground Testing Equipment Of The Micro-Satellite

The micro-satellite with the advantages of low cost, short R&D cycle, high functional density was well developed because of the progress of the Micro-Nano Technology (MNT) and the Micro-Electro-Mechanical Systems (MEMS) technology. The analysis results of the on-orbit data for nearly one year of the power system of the ZDPS-1A show that the ZDPS-1A's power system was imperfect. A new design method was proposed in this thesis to meet the mission requirements of a particular model micro-satellite and improve the technical shortcomings of the power system of the ZDPS-1A. Tri-junction GaInP2/GaAs/Ge solar cells, lithium-ion batteries and COTS devices which were validated by the ZDPS-1A were adopted in this method. A MPPT module was designed in order to improve the energy efficiency of power system and the preliminary test of the MPPT module was taken. An energy balance simulation model based on Matlab/Simulink was established acorrding to the specific parameters of the micro-satellite and achieved the relationship of the area of the solar-cells and the energy balance state of the micro-satellite.Furthermore, a solar cell simulator can be used in the semi-physical simulation of the micro-satellite was designed and implemented. The simulator was based on step-down DC/DC and digital potentiometer ICs, could operate in three different modes such as Constant Voltage (C-V) mode, Constant Current (C-I) mode and Solar-cell Simulation (S-S) mode. The test results of the simulator show that:in the C-V mode, the rippe of the output voltage is less than 200 mV and the error is less than 2.6%; in the C-I mode, the error of the output current is less than 2%; in the S-S mode, compare to the ideal I-V curve, the error of the simulation output is less than 5.62%...