Voltage stability is a major concern in heavily loaded distribution networks. Careful determination of control parameters for loadability enhancement may maximize the utilization of distribution networks. In applicable studies

most of the approaches optimize real/reactive power losses for the current operating conditions of the distribution network. Although

these types of approaches increase the stability margin

such an increase may not be sufficient. The most important factor in loadability enhancement is representation of future load scenarios in addressing the optimization problem. In this paper a look ahead approach is developed for loadability enhancement of an unbalanced distribution system. The determination of the critical loading point is conventionally done using continuation power flow

which is computationally very demanding

and also complex for implementation in unbalanced distribution networks. Therefore

a new

computationally very efficient voltage stability indicator is developed here for determination of the loadability limit. The proposed methodology is demonstrated on IEEE 4 bus and 25 bus unbalanced distribution systems with different transformer connections.