Improving the voltage profile of transmission line under different loading conditions

Abstract

This Paper discusses the impact of the series compensation on the voltage profile of long transmission line. It gives some recommendations and precautions for some expected scenarios of wrong operation that might be taken due to some unknown information about the line condition. Also the paper shows that, the compensation of the line should be initially determined to avoid any problem that might be occurred under the abnormal conditions. This paper has illustrated that, series compensation can cause either high or low voltage depending on the loading condition of the line and depending on the setting of the voltage control as well. In case of the voltage is inadequately controlled at one end of the capacitor, the other side voltage may cause problem. To investigate and study the effect of series compensation on the voltage profile, a simple model of long transmission line has been considered, and for simplicity, it has been representing by two pie equivalent model, and the capacitor has been inserted at the middle of the line. SIMULINK / MATLAB has been adopted to simulate the system.