Power budget of the science and power module during its free flight and integration into the Russian segment of International Space Station

The paper presents data obtained as a result of solving the power balance computation problem for the Science and Power Module (SPM) during the most difficult phase of its flight - up until the point in time when its solar arrays are deployed. The calculation took into account: prediction of the lighting and shadowing environment and the angle between the SPM orbital plane and direction towards the Sun; timeline of the SPM free flight, which takes into account changes in its attitude; timeline of SPM integration into the ISS Russian Segment, including the SPM docking and re-docking and the SPM solar array deployment. The feasibility of implementing the nominal flight plan of the module is demonstrated, a problem was identified with carrying out the SPM re-docking and pull-away maneuver in case of a repeated miss. Measures are proposed for solving the above problem.