Nesterovich V. Development of the methods of estimation of frequency characteristics in the electrical supply systems

Object of research - electric networks of industrial enterprises and power supply facilities. Purpose of research - improving and developing methods for estimating the electric networks frequency-dependent input and mutual impedances and admittances at higher harmonics frequencies with the regard for natural asymmetry and stochastic nature of network parameters. Methods of research - methods of mathematical simulation, electrical circuits theory, spectral and correlation analysis of random processes. Assessment of asymmetry value of mutual impedances and admittances of electric networks has been carried out. The cause of the asymmetry occurrence and the character of its dependence on frequency have also been analyzed. Methods of experimental estimation of frequency-dependent mutual impedances and admittances of electric networks branches and nodes are proposed. These methods are based on the analysis of the transient processes, which take place at linear load commutation. The existing methods are improved and new methods of experimental estimation of these characteristics, which are based on the use of correlation moments and spectral densities of branch currents and node voltages in the network, are described. The results of the dissertation were implemented at "Pryazovski elektrychni merezhi" company and are used as didactic materials at the department of Industrial Electrical Supply at PSTU. Area of use - power industry.