DEVELOPMENT AND SIMULATION OF THE INFORMATION SYSTEM FOR CONTROLLING THE PARAMETERS OF OVERHEAD POWER LINES IN SIMULINK

Abstract

The work developed an information system for controlling the value of the shift angle of the voltage and current vectors of various circuits of a two-circuit controlled overhead power line. The proposed control system is used to adjust the wave resistance, the value of which in two-circuit lines also depends on value of the shift angle. The main task of this system is to support the operation of power transmission lines in the matched load mode, when the value of the wave resistance of the line is equal to the value of the load resistance. The implementation of such a system was considered on the example of the use of twocircuit controlled high-voltage power lines using Flexible Alternative Current Transmission Systems devices. These devices allow to change the values of the secondary parameters of power transmission lines based on the required tasks and load parameters in the network. The principle and functional schemes for the control system of the operation of the phase-shifting device using switches of thyristor switches have been developed. These switches allow to change the value of the shift angle of the voltage and current vectors at the input and
output of the device in the range of ±60° with a step of 4°, all the stages of adjusting the positions of the thyristor switches - 31. A mathematical (simulation) model of the information control system was developed in the Matlab Simulink software environment for a two-circuit controlled overhead power line with 4 phaseshifting devices. The description and formulas for calculating the main parameters of the elements of this model are given. Modeling of the control system in different operating modes, i.e. in different positions of the adjustment steps, was carried out. The simulation results are presented in the form of current and voltage diagrams. Based on the results of the conducted simulation, it was possible to confirm the performance of the developed information control system, by changing the operating modes, to obtain values of the shear angle in the range of 0 - 120°.