Naumov O. Development of methods for transient processes analysis and alternative current machines parameters determination based on frequency characteristics.

Object of investigation is transient processes in synchronous and asynchronous at symmetrical and asymmetrical disturbances from side of the stator winding. Aim of research is elaboration of AC electrical machines mathematical models based on experimental frequency characteristics, for analytical research of transient processes during asymmetrical conditions in stator winding circuit, multi-machine system analysis, and experimantal electromagnetic parameters determination. Theoretical researches are based on general theory of transient processes of alternating current machines, methods of mathematical analysis, founded on Laplace transformation properties and Fourier integral. In dissertation the further development of theoretical conceptions which establish a connection between frequency characteristics of AC electric machines and transient processes in asymmetrical operation modes was obtained. Mathematical models of synchronous and asynchronous machines in the form of analytic expressions were obtained, which allow to determine the asymmetrical operation conditions taking into account multiple rotor circuits and influence of the saturation of the magnetic flux ways. The new method of asynchronous machine frequency characteristics and equivalent circuits parameters determining is offered based on experimental data of two-phase switching on into network. The method of electromagnetic transient processes analytical modelling in multi-machines system with asynchronous machines is developed. Branch - electromechanics.