Baranenko T. Development of calculation methods of interharmonics voltage and current in power systems with electrical engineering installations and direct frequency converters

Object of research - processes in power systems with source of interharmonics. Purpose of research - development of analysis, calculation and levels minimization methods of interharmonics in power systems of large industrial works. Methods of research - methods of spectral-correlation theory of stationary random processes; methods of mathematical simulation of random processes; universal method of electromagnetic process analysis in power circuits of frequency converters, which to base on switching functions and matrixes. The definition algorithm of gain-frequency spectrum of interharmonics is developed in the dissertation. The algorithm is based on spectral-correlation theory of random functions. The calculation methods of interharmonics input current of six-pulse bridge direct frequency converter at linear and sinusoidal modulating functions is developed. The normalization principles have been proposed in the dissertation. The methods of decreasing the level of non-sinusoidal voltage at the simultaneous presence of higher harmonics and discrete interharmonics spectrum in the voltage curve have also been developed. Filter-compensating devices of interharmonics is introduced on metallurgical works "Azovstal". Materials of dissertation is introduced in curriculum on department of electrical supply of industrial enterprise PSTU. Area of use - questions of electromagnetic compatibility.