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Abstract
The method of operative determination of active power losses (both loading and crown) in alternating current lines has been improved. The proposed technique allows monitoring of active power losses in lines. Based on the comparative analysis of different approximation methods, the most effective method of analytical representation of regression dependences of active power losses on the corona on voltage for different weather conditions is proposed. The validity and reliability of scientific statements, conclusions, and recommendations given in the dissertation are confirmed by the analysis of the results of comparative calculations performed for different models. The efficiency of the developed algorithms and programs was tested on control examples with reference source data, where the results of the calculations were compared with the results obtained by standard programs. The developed technique of operative determination of losses of active power (loading and on a crown) allows one to carry out current monitoring of losses and passive parameters of high-voltage power lines of alternating current. The phenomena of self-excitation of generators connected to unloaded power lines are considered at great length. A physical analysis of the ongoing processes is given, and calculation methods are proposed that have been experimentally tested on a dynamic model. The paper takes into account the effect of the wire corona on the conditions of self-excitation of generators with the necessary developments to prevent this negative phenomenon in the main electrical network. Models and methods have been developed for evaluating the effect of the wire corona on the conditions for the occurrence of self-excitation in ultra-high voltage transmission lines.
Highlights
There are many works that consider the problem of self-excitation of generators in main electrical networks when generators of power plants operate on an unloaded line [1–4].Briefly, the process of self-excitation of the generator, with negative consequences for the operation of the electrical network, can be described as follows.In the unloaded mode of operation of the ultra-high voltage transmission line (UHV), there is an issue with the auto-parametric self-excitation of paired harmonic components with a resonant voltage increase and the self-excitation of generators
The charging power of the line can significantly exceed the rated power of the generators connected to the power transmission line [5,6]
Since in complex closed networks it is not possible to obtain these characteristics in the same voltage range as in experimental spans, in this paper, we proposed using these dependencies for mixed types of weather obtained in the voltage range, determined by the control characteristics of the transformers
Summary
In the unloaded mode of operation of the ultra-high voltage transmission line (UHV), there is an issue with the auto-parametric self-excitation of paired harmonic components with a resonant voltage increase and the self-excitation of generators In this mode, the charging power of the line can significantly exceed the rated power of the generators connected to the power transmission line [5,6]. Providing the necessary degree of charge power compensation for a specific solution to the operational problem is problematic due to the inability to regulate the inductance of the shunt reactor In this case, the issue of regulated compensation of charging power is acute to prevent the occurrence of negative phenomena, including the self-excitation of generators
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