Abstract
The paper presents an algorithm to calculate feasible steady-state conditions of an electrical network. A distinctive feature of the calculation is the consideration of constraints on the temperature of bare conductor and the clearance of a controlled span of overhead line. This consideration is based on forming and solving an equation of conductor heat balance to calculate the conductor temperature depending on the current flowing through the conductor and environmental factors, including the actual values of air pressure and air temperature. The paper presents the results of numerical calculations performed for individual overhead lines and for a test 16-node scheme of electrical network. The results illustrate the algorithm performance and the importance of considering the above constraints.
Highlights
The bulk of present-day algorithms and software designed to calculate steady-state and feasible operating conditions of electrical networks do not consider the actual temperature conditions of overhead lines
The design of overhead lines involves consideration of a wide spectrum of factors affecting the line parameters, which enables the safety conditions for people and machinery to be met, and the reliability of the overhead line operation to be provided. Both the parameters of components and the design conditions vary. This leads to the necessity of monitoring the mechanical parameters of the overhead lines [2,3] that are based on both their real measurements and numeric calculations performed during the intervals between planned measurements
We investigated the effect of considering the constraints on conductor sag in the controlled span of the overhead line (14) on the calculation results of feasible power flow on the example of a test tion and load of the electrical network scheme; U nom are the rated voltage levels
Summary
The bulk of present-day algorithms and software designed to calculate steady-state and feasible operating conditions of electrical networks do not consider the actual temperature conditions of overhead lines Such parameters of conductors as active resistance and conductor sag (or clearance) are frequently determined in these conditions considering only the air temperature, and ignoring the effect of many other environmental factors and current load of conductors [1]. The overwhelming majority of domestic and foreign software developed to calculate the feasible load flow (except for the one proposed in this paper) does not take into account mechanical parameters of conductors: the sag and length of the conductor (or clearance) This leads to an incorrect estimation of a capability of transmitting additional power along individual conductors and in the spans of the electrical network.
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