A Study of Japanese Future Power System by Combining DC Security-Constrained Unit Commitment and AC Optimal Power Flow

As one of the measures to accept massive integration of renewable energy into Japanese electric power system, the Japanese version of Connect and Manage is under technical development and demonstration. By combining DC-SCUC and ACOPF models, we developed an operation planning model which considers transmission losses, active and reactive power flows, voltage control, and transformer taps. The verification calculation was performed on a future Tokyo bulk power system model in 2030. The optimal start/stop plan obtained by the combined model was modified from one by DC-SCUC, which indicates that it is important to consider the transmission losses and voltage control appropriately in Unit Commitment.