Development of the Methodology for EconomicalMathematical Modeling of Overhead Power Lines for Rated Voltages of 110 kV and Higher
Abstract
The importance of this study is stemming from the fact that the total discounted expenditures, which are the most important dynamic criterion for selecting the optimal investment project version, do not determine the actual costs for making a unit product, e.g. transmission of 1 kW h of electricity, and cannot serve as a criterion for comparison of versions with different throughput capacities or with different calculated period timeframes. Under the conditions of a competitive market of electric energy, this entails increased price risks and prevents making the optimal choice of electric energy supplier. In view of this, the article proposes an alternative economicalmathematical power line model constructed on the basis of specific total discounted expenditures and discounted amount of transmitted electric energy taking into account the load losses, corona losses, and losses in the line insulation. The proposed model is essentially a dependence of specific discounted expenditures for transmission of electric energy on a number of technicaleconomic parameters of the power line itself and on the parameters of its operation mode. Based on the proposed alternative model, the economic advisability curves of current intervals are drawn, and a procedure for selecting the optimal cross sections of the newly constructed overhead power line wires is proposed. The article also proposes a newly developed procedure for selecting the nominal voltage of the line and of the power supply source for a facility being electrified, as well as a procedure for operational economic optimization of current density in the wires of operating power lines.
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