Abstract
"This article discusses the development of a prototype power supply system «KAZEOSAT -2» for which two types of load behaviour are modeled and described. In the first approach, the analysis focused on using load duty cycles to simulate the average power consumption per orbit in order to study the behaviour of the subsystem for various orbit scenarios. The second approach consisted in modeling the load switching behaviour taking into account the event of the mission flight sequence. The article also analyses the state of the energy balance based on the events of the mission flight sequence, as well as predicts the effect of power peaks on battery discharge behaviour. Busbar regulation was implemented, the converter block and converter efficiency were modeled using resistive resistance in parallel to its input ports. It is noted that the fill factor of the converter was controlled using a PI controller and a comparator, which measure the load voltage and compare it with the reference value. Keywords: reliability, block diagram, modelling, block, subsystem"