Іierusalіmova T. Influence of non-sinusoidal regimes of electric networks operation on the processes of power consumption

Object of study are energy processes in three-phase four-wire electric networks at the point of connection of a consumer with the linear and nonlinear load. Subject of research are energy parameters and characteristics of three-phase four-wire electric networks under non-sinusoidal regimes of operation. The aim of the work is providing of power consumption in electric networks in the non-sinusoidal regime at the point of a load connection. Research methods are the theoretical methods based on the systematic approach and usage of the methods of electric circuit theory as well as of the linear algebra, vector algebra, three-dimensional real and complex vectors, methods of spectral analysis, decomposition in the complex Fourier series, methods of imitational simulation. The reliability of the work is ensured by the correct usage of the research methods and is confirmed by the numerical experiments in the Matlab environment and by the industrial application. Practical significance of the obtained results for the electrical energy sector is identification of the reserves for improvement of the quality of delivered and consummated electrical energy. Scientific novelty of obtained results consists in the following: classification in the spectral form of the local non-sinusoidal energy processes in four-wire three-phase network at the point of connection to a consumer load has been further developed; a vector mathematical model of the energy processes in three-phase four-wire system, which differs from the existing ones by the fact that it takes into account two methods of analysis of energy processes: temporal and spectral has been firstly developed; usage of spectral method of the energy processes analysis, which allowed to determine the power imbalance and power pulsations as well as to establish a link between instantaneous and integrated powers, which are used for the analysis of unbalanced and balanced regimes of the electric networks operation has been improved; the analytical expressions for the constant and variable components, scalar and vector instantaneous powers for three-phase network in the complex form, which allow to assess the effectiveness of energy consumption in any regimes have been further developed. The main results of the carried in the thesis researches were used in OOO "KIEVPROMELECTRO" (Kiev) in the method of the influence of non-sinusoidal regimes of electric networks operation on the processes of power consumption at design of the power supply systems, as well as in NTU "KHPI" in the educational process at the Department of automation of power systems.