Минимизация технических потерь активной мощности в воздушных линиях электропередачи сверхвысокого напряжения с учетом коронирования проводов

Abstract

A technique has been developed to minimize active power losses that takes into account the corona effect on extra-high voltage overhead power transmission lines in normal modes of their operation. The corona effect is modeled by a specific conductivity, which is a nonlinear function of the voltage level. The equivalent conductivity value is corrected for the actual weather conditions iteratively by changing the r.m.s. voltage value. A universal expression for estimating the effect of operating parameters on the change of voltage along the line length and a graphic illustration of this effect are presented. By differentiating the functional dependence of the total active power losses, formulas are obtained for calculating the operating parameters corresponding to the minimum loss values, assuming that the conductivity does not depend on voltage. It is shown that the operating and technical limitations on the voltage values at the line ends and in its intermediate sections significantly reduce the range of transmitted power with minimal losses. The iterative calculation sequence for determining the reduced voltage level corresponding to the lowest total losses is outlined. The transmitted power values at different corona intensities are calculated. The study results have shown the need to take into account the nonlinear dependence of equivalent conductivity on the r.m.s. voltage value.