Optimal control strategy of a unified power flow controller incorporated with an active power source

A Unified Power Flow Controller (UPFC) incorporated with a battery energy storage system is examined. The battery system forms an active power (AP) source. The design of the UPFC-AP is formulated as an optimization problem in which practical operating constraints of the network and that of the UPFC-AP are taken into consideration. A feasible operating regime is obtained, within which the range of the AP output power that can be dispatched for given load demand is prescribed. The application of a proposed economic dispatch strategy results in an optimal load tracking scheme, the effectiveness of which is demonstrated through numerical examples.