Beta (phase constant) compensation for flat voltage profile in a transmission line

• A new method of reactive power compensation has been proposed in order to obtain flat voltage profile along the transmission line.
• Flatness Index of the transmission line has been defined and explained for various conditions.
• Simulation results of the proposed method have been presented.

The reliability of the bulk electric power systems is not only dependent on the generation but also on the transmission system. In long lines, the voltage along the transmission line varies with the loading conditions. Proper reactive power compensation helps to maintain the voltage along the line within acceptable limits. This paper proposes a compensation method to adjust the phase constant of the transmission line in order to obtain a flat voltage profile along the line. Case studies conducted on a long transmission line are presented.