Reactive Power Management at High Voltage Long AC Transmission Line

Abstract

In a high voltage long AC transmission system, the system voltage changes continuously with the changes of load. The reactive power also changes with the changing of load which affects the system voltage for this reason it is important to analyze the power system in order to determine system parameters and its variation under various load conditions. The reactive power can be improved by compensation. Reactive power compensation is defined as the management of reactive power to improve the performance of AC power systems. In general, the problem of reactive power compensation is related to load and voltage support. In load support the objectives are to increase the value of the system power factor, to balance the real power drawn from the AC supply, to enhance voltage regulation, and to eliminate current harmonic components produced by large and fluctuating nonlinear industrial loads. Voltage support is generally required to reduce voltage fluctuation at a given terminal of a transmission line. Reactive power compensation in transmission systems also improves the stability of the AC system by increasing the maximum active power that can be transmitted. This thesis presents a different section of transmission line with simulation work by using MATLAB. It also presents reactive power compensation by using capacitor banks at different section of transmission line. There is voltage, current and power level shown in table and graph. How the power level decrease by the inductive load without compensation and how much increase the power level by using the capacitor banks compensation are analyzed in this work.