Saravas V. Harmonic distortions of voltage and current in the electric networks with the permanent-magnet brushless AC motors and asynchronous valve cascades

The object of research - the processes in power systems with sources of higher harmonics and interharmonics. Objective - development of methods for analysis of harmonic distortions arising in the mains supply at work asynchronous valve cascades and permanent-magnet bruchless AC motors. Research methods - the method of analysis of electromagnetic processes in the power circuits of frequency converters based on switching functions and matrices, simulation modeling method, statistical methods and experimental researches. Theoretical and practical results - an actual scientifically-applied problem of developing methods for the identification, analysis and calculation of higher harmonics and interharmonics, generated by variable frequency drives on the examples of asynchronous valve cascades and permanent-magnet bruchless AC motors. Novelty - on a model-based permanent-magnet bruchless AC motors and asynchronous valve cascade obtained new dependence of the interharmonics amplitude-frequency spectrum in electrical networks, which take into account that the concept of converters working is a discrete work-pulse, and the converters voltage ripple in the DC link; the principles of norming form nonsinusoidal level, which taking into account the levels of voltages and currents interharmonics, generated in the mains supply variable frequency drives further developed. The degree of implementation - results in the form of an algorithms and models adopted metallurgical enterprises "AzovElectroStal" for use in solving problems of minimizing harmonics distortion of voltages and currents generated in the mains supply variable frequency drives, as well as in the educational process SHEI "PSTU". Scope - electrical engineering.