I. Introduction
In recent years preference has been given to combining the functions of a gas-turbine engine and an electric power generation system in one device when designing power supply systems (PSS) for aircraft. This device is called the “starter-generator” (SG). SG allows improving the weight-to-space ratio and increasing the reliability of PSS [1], [2]. This trend leads to the implementation of the concept of a fully electrified airplane (FEA) [3], [4]. The implementation of the FEA allows to significantly increase the power and functionality of the generators and devices for the converting electric energy parameters for the main and additional generation channels [5]–[7].