Optimal operation of co-phase traction power supply system with HESS and PV

The co-phase traction power supply system (TPSS) with hybrid energy storage system (HESS) and photovoltaic (PV) is proposed to eliminate the neutral section and improve the regenerative braking energy (RBE) utilization. Although the integration of HESS and PV facilitates the energy saving and cost reduction of the co-phase TPSS, the high cost and configuration of HESS should be considered, which is the key to affect the optimal operation strategy of co-phase TPSS. Here, the optimal operation strategy of co-phase TPSS with HESS and PV is proposed to design the HESS configuration, recycle RBE and improve power quality. The proposed model aims to minimize the total system cost, including HESS investment cost, electricity cost and operation and maintenance cost. Moreover, the proposed model is formulated as a mixed integer linear programming by employing linearization approaches. Finally, case studies verify that the 29.2% cost reduction rate is achieved and the three-phase voltage unbalance meets the standard requirements.