Alternate power flow controller for voltage control in an unbalanced distribution network

This paper proposes the use of power flow controller based on multi-winding transformer (MWT) for voltage control in a three phase unbalanced distribution network. The power flow controller can be taken as an add-on block to the existing distribution transformer and its parameters can be adjusted to control voltage magnitude and angle at various buses in the distribution network. The mathematical model of the controller is derived for implementation of load flow program on three phase unbalanced distribution network. The optimal values for controller parameters, for improving voltage profile and reducing unbalance in the distribution network, are found using Grey Wolf Optimization (GWO) with simulation studies carried out on 26 bus test network.