The оbject of research: transient and quasi-steady processes of switched reluctance starter-generators. The purpose of research: the development of mathematical model for analysis modes and the substantiation of transient and quasi-steady electromagnetic processes formation principles of switched reluctance starter-generators to increase their energy efficiency. Methods of research are based on mathematical, simulation and physical modeling, finite element methods, approximation of inductance dependences, commutation switching functions, decomposition of periodic signals in a Fourier series, numerical methods for result processing. Theoretical and practical results. The important scientific task has been solved in the work: the developing a mathematical model for analyzing modes, the determining principles of formation the nature of transient and quasi-steady processes of switched reluctance starter-generators taking into account the parameters of electromechanical converters, aimed to improving their energy efficiency. Improved mathematical model of switched reluctance starter-generator due to the developed logical expressions for determining the state of the semiconductor converter elements and the coupling equations between this reluctance machine and DC circuit elements, accounted steel and mechanical losses, which made it possible to study the features of the quasi-steady and transient processes, as in starter, as in generator mode. Simulation models of switched reluctance starter-generator have been developed, which take into account the nonlinearity of the magnetic system, discrete operation of the semiconductor converter, mechanical losses, losses in steel and windings, the load of the primary motor and battery parameters. For the first time, with the proposed mathematical model help, scientifically found the influence of the parameters of switched reluctance starter-generator, battery and current limitation on the energy indicators on quasi-steady and transient processes in starter and generator modes. Recommendations for the principles of switched reluctance starter-generator control in the starter mode were developed, which provide the required starting processes duration, the battery energy consumption and to reduce the sharp surges of phase and battery currents. The principles of switched reluctance starter-generators control in generator mode with excitation and load changes were developed, which provided the deviation of output voltage up to 1...2 % of the nominal value for the entire load range and allowed to reach the reduction of transient’s duration. Scientifically found the minimum capacitance value of the DC circuit capacitor, which ensures the accordance of the generator output voltage quality to the standards. An experimental sample of switched reluctance starter-generator was developed and its experimental studies in starter and generator modes were carried out. Obtained operating characteristics of switched reluctance starter-generator in generator mode confirm the effectiveness of proposed principles of its output voltage regulation by changing the phase current maximum value. The results of dissertation work were introduced in educational process of the Department of Electrical Engineering and Electric Drive of the Kiev National University of Construction and Architecture and the Department of Electromechanical Equipment for Energy-Consumption Industries of the Institute of Energy Saving and Energy Management of the National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" as a mathematical and simulation models, calculation algorithms and principles of control of the switched reluctance machines.
