Definition of the dependability index of power supply systems

Abstract

The article shows that one of the important indicators of energy efficiency is the index (index) of dependability of electricity supply, which is characterized by a decrease in the share of damage from interruptions of power supply in the gross domestic product. The questions of obtaining an expression for the optimal value of the degree of dependability are considered taking into account the values of the reduced costs and their economic and energy components.The significance of an assessment of damage caused by a shortage of electricity is shown in the absence of an emergency reserve. The damage caused by asymmetry and nonsinusoidal tension, on average, is several times less than the voltage associated with the deviations and is most pronounced in the metallurgical and engineering industries. An expert assessment of the annual losses associated with the low quality of electricity in Ukraine and in the world is given.The importance of the problem of improving the quality of electric energy was stressed; attention was drawn to the increased role of the sinusoidal distortion of the voltage curve in determining the dependability of electricity supply, as well as its relation to the economic indicators of the country's development. Virtually all indicators of the quality of electrical energy affect the dependability and economic performance of electrical equipment and ultimately affect the efficiency of the entire power supply system. It is shown the importance in specific cases of exceeding the cost of measures to correct the levels of nonsinusoidality over the value of economic damage. The values of the power supply dependability index in the complex of the energy efficiency index are formulated; the values of the specific capital investments in the reserve generating capacity are given. Estimated calculations of dependability indices of electric power industry subjects of Ukraine are given.In the conclusions, it is justified to apply the minimum of the given costs as a criterion for estimating the dependability of the power supply system with the equality of the optimization values of the dependability index.