Kholod O. Energysaving semiconductor converters for transport power supply systems

Object of research - electromagnetic processes and energysaving of the semiconductor converters with powerful energy storage for railway and subway electrical power systems. A purpose of research - design of main circuits and control systems energysaving semiconductor converters with powerful energy storage for railway and subway electrical power systems, perfecting of calculation methods and characteristics of these converters. Methods of research - fundamental rules of the electric circuits theory and the modern theory of an instantaneous power, numerical methods of the solution of the differential and algebraic equations, matrix transformations of co-ordinates, computer simulation in the environment of package MatLab. Theoretical and practical results - have received developing fundamental theory of analysis of electromagnetic processes in active rectifiers - voltage sources and powerful diode rectifiers with the capacitor filter; main circuits and control systems of active rectifiers with stationary or with the onboard energy storage which one usage in electrical power systems. Novelty - receive formulas and graphics for definition of a maximum of an intermittent current of the diode rectifier on known relative rectified voltage, the equation of an external characteristic of the diode rectifier, approximate expression for definition of variable component of a current through the condenser of the diode rectifier are received; a rated ratio for definition of the running modulating frequency of a phase current of the active rectifier, a ratio for calculation of inductance of input reactors of the active rectifier; the method of recording of dynamic losses in transistor-diode units is developed at computer simulation of converters with a pulse-width modulation, a method of calculation of the maximum and real efficiency of electrical power systems. Degree of introduction - PE "The Kharkov subway" (Kharkov), Research-and-production firm "EOC" (Kharkov), SE "Scientific research institute HEMZ" ( Kharkov), Open Company science and production association "Vertical" (Kharkov). Area - machine industry.