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The researchers analyze energy processes running in an autonomous electric power system consisting of a synchronous permanent magnet generator and a semiconductor converter. Current, voltage and capacity of key components of the system are evaluated, and the system operation modes are determined for the variable magnitude and character of applied load at the constant voltage output frequency. Parametrical law is proposed to control semiconductor frequency converter serially connected to load and generating reactive power. The influence of the converter on the basic design parameters, energy specifications of the synchronous generator and the system as a whole are evaluated.

The thermal parameters of the resistors of self-synchronization included in the excitation systems of turbo- and hydrogenerators are studied.

It is suggested to replace the double-winding transformer of the excitation system of a synchronous machine with a valve-side winding rated for the total forcing voltage and rated current by a three-winding transformer with two valve-side windings, i.e., working and forcing. In the proposed transformer, each of the windings is connected to its own converter bridge circuit and the voltages are summed up during field forcing, which allows the power of the rectifying transformer to be decreased, the shapes of the current and voltage curves at the converter inlet and outlet to be improved, transformer losses and voltage crests on the rotor, and inverse voltages on the thyristors to be reduced, etc.

The purpose of this paper is the examination of problems involving energy conversion in electromechanical converters with allowance for the distribution of magnetic energy in various parts of the magnetic system and simultaneous mutual exchange between three forms of energy - the source of supply, the magnetic energy of the system, and mechanical work.

1. The reduction in the draw characteristics of electromagnets with neither one nor two poles with respect to those of a two-pole electromagnet does not exceed 15–20% in the region of preliminary block insertions to 0.75 LW in the winding. In this case, the reduction in the integral work of the electromagnets does not exceed 20%. 2. When the winding is split into sections and they are mutually separated, the difference in the pulling force between two-pole and poleless electromagnets decreases for the same block insertion in the winding. 3. Conditions for which the pulling force of an electromagnet with a single pole on the side of the effective gap will be higher than that of a two-pole electromagnet, and the pulling force of a poleless electromagnet will be higher than that of an electromagnet with a single pole on the side of the ineffective gap are determined and proven experimentally. 4. The interrelation between the relative reduction in the pulling force of an electromagnet ΔF/F0 and the relative lengthening of its winding ΔL/LW0 is established.