Algorithms For Considering The Temperature Of Overhead Conductors In The Calculation Of Steady States Of An Electrical Network
Keywords:Normal steady state, feasible steady state, conductor heat balance equation, conductor state equation, overhead line resistance, conductor sag in the span
This paper presents an algorithm implemented in the software for calculating the normal steady state of an electrical network based on the joint solution of a system of the nodal power balance equations using the Newton – Raphson method and the heat balance equation for overhead conductors. The algorithm allows considering the resistance of overhead conductors as a function of the magnitude of current in the conductors of various voltage levels based on the calculation of their temperature. The improved expressions for determining the coefficients of the heat balance equation for a conductor are obtained subject to the actual environment parameters (atmospheric pressure, air temperature, etc.), which were calculated by V.V. Burgsdorf and recommended by the regulatory documents for normal values of air parameters. Consideration of the current temperature of overhead conductors also allowed improving the value of the conductor sag in the span and expanding a set of inequality constraints in the calculation of feasible steady states of electrical networks.