This article analyzes the possibility of decomposing a radio engineering system into parts, provided that one of the two stabilizing parameters of the coupling scheme is adjusted. An analytical calculation was made (in general), which proves the possibility of adjusting only one stabilizing parameter in the coupling scheme. A numerical example is provided confirming the above idea.

Keywords: HIL simulation, radio engineering system, decomposition, coupling scheme, stabilizing parameter, coupling two-port network, ideal time delay line, Schur complement, Y-parameters

In the article possibilities and elements for PHIL simulation of multifunctional modular systems (MFMS) are considered. For this purpose, mathematical studies of such systems were carried out, the tasks of their basic elements were singled out, and the main task was to create a universal modular model. The structure of the energy MFMS and its problems from the position of graph theory are determined. The analysis of the existing methods of PHIL simulation is presented, as well as the structure of the simulated fragment of the system at the junction of the two modules is defined with using the "coupling" method of the scheme. As a result, conclusions were drawn about the possibility of applying a PHIL simulation to the MFMS.

Keywords: PHIL simulation, modular systems, macro task, power hardware-in-the-loop simulation, analog-digital system, numerical part, analog part, Gauss-Seidel method, Jacobi method