E. N. Eremin, A. S. Losev, S. A. Borodikhin, A. E. Matalasova, I. A. Ponomarev. Using thermal treatment for hardening corrosion-resistant coatings surfaced with a flux-cored wire containing BN-TiB 2 -ZrB 2 complex V. I. Kuznetsov, O. A. Sharikov. A method of processing mechanical mixtures using vortex set of deep separation G. N. Sokolov, A. A. Artemev, Yu. N. Dubtsov, E. N. Eremin, V. B. Litvinenko-Arkov, A. S. Losev. The influence of nitrogen and titanium carbonitride particles on structure and properties of metal Fe-C-Cr-Ni-Mo system deposited by flux wire

The paper presents the use of wavelet packet transform for a non-sinusoidal mode analysis of power supply systems taking into account the actual heating of conducting parts. Higher harmonics cause additional heating of conducting parts, and consequently, there is an increase in power and energy losses. The range of resistance variation in the operating temperature range can substantially affect the estimated value of losses. The accounting of actual heating will allow one to specify the feasibility study in selecting and implementing measures on higher harmonics filtering in power supply systems. The wavelet packet transform has a number of advantages compared to the Fourier transform in analyzing non-sinusoidal modes. The use of the wavelet packet transform is proposed in this paper for analyzing non-stationary modes of power supply systems.

The paper addresses the issue of calculation of incidental power losses due to interharmonics. In non-stationary modes of power supply systems it is necessary to obtain data on the amplitude, frequency and time of higher harmonics presence in the current (voltage) signal. The wavelet packet transform is used to solve the posed problem. The numerical experiment fulfilled with the Matlab (Wavelet Toolbox) software is presented in the paper. The possibility of frequency decomposition of a signal into harmonic groups in accordance with IEC 61000-4-7:2 is shown. A side frequency resulted in the voltage fluctuation effect is defined for each harmonic. Based on the numerical experiment the power and energy losses from higher harmonics and interharmonics in a cable line feeding the load node are determined.

The article describes the simulation of the current resonance that occurs in the power supply system when the degree of reactive power compensation is varied in non-stationary operation modes and the presence of electric receivers having a nonlinear voltagecurrent characteristic. In addition to simulating the mode of parallel resonance arising at frequencies close to the frequencies of higher harmonics, the proposed algorithm determines all possible resonance frequencies at which the parallel resonance condition under different assumptions can be satisfied, as well as the relative error of calculation for different cases: when all the components of complex impedances are taken into account; without taking into account the active components of the resistance; taking into account the active component of the resistance of the transformer, but not taking into account the resistance of the loads; without taking into account the active component of the resistance of the transformer and without taking into account the resistance of the loads. The purpose of the proposed work is to show how the accounting (non-accounting) of the components of complex resistances affects the results of determining the resonant frequencies.