Sobchuk D. Increase of distributive electric grids reliability at the expense of renewable sources of electric energy

Object of the research - normal modes of distributive electric networks with renewable sources of electric power; the aim of research is to increase the reliability of distributive electric networks and improve the quality of energy supply at the expense of renewable sources of electric power. In the dissertation generalized methods of similarity theory and modelling are applied for obtaining integral index of distributive electric networks (DEN) with renewable sources of energy (RSE) operation quality, tools of Markov processes for creation of a unified methodological base in the process of the analysis of structural, balance and mode reliability, probability theory for taking into consideration the stochastic character of renewable source of energy (RSE) operation mode. Stable modes are simulated on the base of the method of node voltages and are analyzed, applying Gauss and Newton methods. Theoretical results - for the first time method of evaluation of correspondence of renewable sources of energy operation schedules and schedules of distributive networks energy consumption in the form of stability factor is suggested, this method unlike already known methods, taking into consideration probabilistic character of generation and consumption of electric power, allows to increase evaluation adequacy of balance reliability of electric networks ; method of evaluation of distributive electric networks with decentralized generation operation quality is developed, that is shown in determination of integral quality index, using the values of quality indices of each of operation modes, in which electric network can be as a result of its elements failure and allows to evaluate comprehensively structural, mode and balance reliability of electric networks operation, taking into account the charecteristic features of renewable sources of energy; method of determination of renewable sources of energy optimal power was further developed. This is shown in the accounting of instability factors of the sources, places of their location and enables to determine the directions of expedient construction of renewable sources of energy to provide reliable and quality energy supply. Practical results - on the basis of the research, carried out, conditions for the solution of the problem dealing with the increase of reliability of distributive electric networks with renewable sources of energy are created, that consists in the choice of optional power of RSE, connected to existing DEN, taking into consideration their impact on mode and balance reliability. Degree of introduction - the results of the research are implemented in joint stock company "Volynoblenergo" (protocol of 19.03.2014) and in educational process at Lytsk National Technical University. Sphere (branch of application) - electrical power engineering.