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Abstract
In this paper, an understanding of reactive power associated with power transmission networks is developed. To make transmission networks operate within desired voltage limits, methods of making up or taking away reactive power - hereafter called reactive-power control – are discussed. Before proceeding further, however, a thorough understanding of the reactive power in ac systems is necessary. The Reactive power management play an important role in voltage profile of the power transmission systems. Adequate reactive power control solves power quality problems like flat voltage profile maintenance at all power transmission levels, improvement in power factor, transmission efficiency and system stability. The Series and shunt Capacitor compensation techniques are used to modify the natural electrical characteristics of the electric power system. Providing reactive shunt compensation with shunt-connected capacitors and reactors in optimal location is a well-established technique to get a better voltage profile in a power system. This paper is not intended to provide a comprehensive analysis of transmission lines. Rather, its objective is to examine those aspects that enhance the understanding of the interplay between voltages on the line and the resulting reactive-power flows.