Energy Management of Connected Co-Phase Traction Power System Considering HESS and PV

A novel energy management model for connected co-phase traction power system (CCTPS) is proposed, in which hybrid energy storage systems (HESS) and photovoltaic (PV) are considered, and the power exchanges between adjacent traction substations (TSSs) can be fulfilled via power transfer controller (PTC). The energy management strategy aims at coordinating the regenerative braking energy, local renewable energy and the peak-valley difference between adjacent TSSs so as to minimize the daily operating costs of CCTPS, and the three phase voltage unbalance constraints are particularly considered, which is a remarkable contribution of this study. This optimization problem is formulated as a mixed integer quadratically constrained programming (MIQCP) model and solved by CPLEX solver. The proposed strategy is tested with a real high-speed railway line and two cases are analyzed and compared. The simulation results show that the developed energy management of CCTPS brings about significant economic benefits while the three-phase voltage unbalance is in line with national standards.