Plakhtii O. Improvement of electromagnetic compatibility of traction substation convertors with supply grid and catenary

Subject of the research: electromagnetic compatibility of converters of the traction substation DC with the power supply and contact networks The purpose of the study: improvement of electromagnetic compatibility of converters for traction substations DC supply with contact networks by using an active rectifier with power factor correction. Methods of the research: the classical theory of electrical circuits; numerical methods for solving differential and algebraically; methods of Fourier series; frequency-domain methods of control theory and the software packages Matlab and MathCad. Theoretical and practical results:the analytical expressions that determine the dependence of the maximum switching frequency of the keys two-level active rectifier with hysteresis control system as a function of parameters of the mains, the scheme of the MSA, load and amplitude of hysteresis; defined control characteristic of the output voltage of the active rectifier. Scientific novelty: for the first time obtained the control characteristic of the output voltage of the active rectifier with hysteresis control system; first identified the expression defining the dependence of the spectra of higher harmonics of the phase currents and the output voltage from the mains frequency and the switching frequency; first developed the system of management compensation of the active rectifier. Implementation level: tthe results of the thesis are embedded in the development of scientific and production Association "VERTICAL", scientific-research Institute "KhEMZ" and design Bureau "WO OWEN", and also in educational process of Ukrainian state University of railway transport. Scope of applicability:semiconductor converters of electric power, railway transport