Operating Modes Optimization of Bulk Electrical Power Networks: Structural and Parametrical Methods

Abstract

One of the main elements of the power system is the extra high voltage transmission lines, which are system-forming for the bulk electric networks. The normal operation of the integrated power system depends on the reliability and efficiency of operation transmission line. To ensure efficient operation of the extra high voltage transmission line, it is necessary to optimize the voltage mode and reactive power. Optimization of the transmission line mode operation by minimizing the losses of active power in it, should be based on solving problems of optimization of voltage and reactive power. The control of the operating mode of the transmission line is the correct choice of the composition of the charging power compensation devices in order to regulate the voltage levels and power factors on the bus terminals. Optimization of the transmission line modes operation in this problem statement is performed, focusing on some of the most significant mode parameters. It should also be noted that previous studies have not addressed issues related to the corona discharge of wires and its impact on voltage distribution and the feasibility of depth regulation in lines of this voltage class. One of the measures to reduce electricity losses is to optimize the operating modes of transmission lines in terms of voltage and reactive power. In this formulation of the problem of transmission lines is considered in isolation for the three most common modes: minimum, maximum and operational operating mode of power transmission. The optimal voltage value at the beginning or end of the transmission line, as a rule, usually cannot be achieved due to the inability to increase the operating voltage to the maximum allowable value under the condition of equipment insulation and insufficient power and regulation of the installed compensating devices. By using modern devices for controlled charging compensation of the power line, you can achieve deeper regulation of reactive power and voltage, and, accordingly, minimize the loss of active power. A complex of interrelated mathematical models has been created to determine the economic effect of optimizing the mode of an electric network with extra high voltage transmission lines in terms of voltage and reactive power, taking into account the probabilistic nature of corona losses. Techniques, algorithms and methods have been developed for the operational optimization of the modes of individual power transmission lines, taking into account corona losses. Expressions for the optimal voltage of power lines and voltage control laws are obtained. A methodology and an algorithm for operational optimization of the mode of an electrical network with power lines in terms of voltage and reactive power have been developed. The verification of the adequacy and effectiveness of the proposed methods and algorithms was carried out by means of comparative calculations for real extra high voltage overhead lines and circuits of electrical systems with operating extra high voltage overhead lines.