Definition of the dependability index of power supply systems
Journal Title: Електромагнітна сумісність та безпека на залізничному транспорті - Year 2017, Vol 1, Issue 13
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 dam-age 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 ac-count 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 ten-sion, 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; at-tention was drawn to the increased role of the sinusoidal distortion of the voltage curve in deter-mining 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 effi-ciency of the entire power supply system. It is shown the importance in specific cases of exceed-ing 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 effi-ciency index are formulated; the values of the specific capital investments in the reserve generat-ing 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 es-timating the dependability of the power supply system with the equality of the optimization val-ues of the dependability index.
Authors and Affiliations
I. Zhezhelenko, V. Saravas
Keywords
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