Abstract
This paper aims at development of a new emergency control scheme that can minimize interrupted power even under a severe fault condition by effectively using advanced power control devices available in the future power system. As the available equipment in the future grid, unified power flow controllers (UPFCs), one of the FACTS devices, and battery energy storage systems (BESSs) are considered in addition to generators and controllable loads. In order to overcome a transmission overload problem caused by a route fault, a new control method based on multiple optimal power flow (OPF) calculations is proposed and applied to the available equipment. Numerical simulations are carried out with a route fault in a meshed test power system. Several simulation cases, with and without UPFCs and BESSs, are compared to verify the effect of UPFCs and BESSs on the reduction of interrupted power. The results show that the UPFCs and the BESSs can work well in the expected operating mode by using the proposed control scheme, and that they make it possible to reduce the PNS.
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