Filyanin D. Methods and tools of information support for mode management tasks of electrical networks in low power quality conditions

The conducted studies have shown the relevance of the problem of the influence of higher harmonics on electric networks equipment. The necessity of differentiation of losses according to harmonics order is substantiated. Existing methods of detection the sources of harmonic distortion do not allow to authentically determine the sources of distortion themselves and do not give a complete snapshot of the distribution of power of higher harmonics in the electrical network. For solve problems related to improving the power quality, a conceptual model for providing the power quality in electric networks has been developed, and the place of identification of the distortion source in the set of measures for improving the power quality has been defined. The simulation model of the distribution network with several sources of harmonic distortions is developed. Based on the results of measurements carried out with this model, the using distribution measurements technology to identify sources of distortion has been substantiated. The method of distribution coefficient on k-th harmonic is developed, which allows distributing compensatory payments between elements of the electric network and consumers, depending on their part in the distribution of higher harmonics power. To improve the authenticity of the detection of distortion sources in case the presence of fast-changing harmonic distortions sources in the electric network, a modified method of harmonic analysis "FFT+DFT" is suggested, which allows to localize the appearance and disappearance of harmonics on the main measurement interval with an accuracy of up to one period of fundamental harmonic. The simulation model of the distribution network with several fast-changing sources of harmonic distortions is proposed. The use of "FFT+DFT" in calculating the distribution coefficient allows to detection not only the degree of participation of each elements of the electrical network in the distribution of distortion power, but also estimate the losses inflicted by each harmonic, to all elements of the electrical network in the event of fast-changing distortion sources. The calculation of the losses from the non-sinusoidal voltage in the electric network of the industrial enterprise for the current method in Ukraine is carried out. According to its results, the economic expediency of differentiating the losses by harmonics order is substantiated. A new method for charging payment for power consumption based on detection of secondary power of higher harmonics and tariff coefficients characterizing the losses to the technological process and electrical equipment of the power system and consumers by the influence of higher harmonics has been developed and substantiated. The recommendations on practical application of the results of the research, which carried out in the dissertation work are given. An algorithm for extension the functionality of electronic power meters is proposed, which allows monitoring the harmonic composition of the supplied power and recording the power and energy of higher harmonics. The issue of application of primary measuring converters with registration of the power of higher harmonics in the automated systems of commercial power accounting is considered, and the method of indirect control of the temperature of cable lines is proposed.