Slobodchikov I. Improving of power quality of DC traction substation by active filter methods

Object of study: the electromagnetic processes in the installation of the rectifier DC substation. Subject of study: two-channel closed structure of automatic control of the rectified voltage of DC substation. Methods: classical theory of electrical circuits, the methods of harmonic analysis, mathematical formalism of Z-transforms, the theory of generalized functions, the method of signal graphs, simulation. The novelty: of the first time calculated the equivalent interfering output voltage substation, which determine the effectiveness of passive filters; designed two-channel closed system of automatic control based on the series connection of diode and thyristor rectifiers and active filters, carrying out the suppression of harmonics and regulate the output voltage substation; developed a dynamic model of the rectifier unit with booster thyristor converter, which allows to provide such a system as a pulse-amplitude modulator and watch her work in a closed structure; the analytical expressions relating the parameters of a closed two-channel automatic control system with the effect of suppressing low-frequency harmonics are obtained; are further developed the theory of active filters, which are distinguished by the presence of adaptive feedback gain contour, which makes them invariant to the modes of supply and the traction load. The practical significance of the results obtained for the electric is that developed and scientifically validated two-channel closed automatic control system to improve the quality of electric power at the output of the DC traction substation. The result of the thesis is recommended for practical use in the upgrading and development of new rectifier and filter equipment of traction substations. The practical value of confirmed acts to implement the results of the thesis in the Department of Electrification and Power of Ukrazalіznitsya (Kiev), Inc. SRI "KHEMZ" (Kharkiv), Slov'yanskіy distantsіya electricity Enterprise "Donetsk Railway" (Slavyansk), and in the learning process at the department of electric traction systems of the Ukrainian State Academy of Railway Transport. Developed a physical model of a hybrid parallel active filter, which is used in the learning process at the department of electric traction systems of the Ukrainian State Academy of Railway Transport. Developed a universal computer program in an environment Microsoft Visual Studio Express 2010, which allows calculating the equivalent interfering voltage of output voltage of the DC traction substations. Application: electric transport.