Citation: | LIU Yuanli, LI Qunzhan. Day-Ahead Optimal Scheduling of Co-phase Traction Power Supply System with Photovoltaic and Hybrid Energy Storage[J]. Journal of Southwest Jiaotong University, 2023, 58(1): 30-39. doi: 10.3969/j.issn.0258-2724.20200534 |
Power quality issues represented by voltage unbalance and the electrical sectioning issues have severely restricted the safe and efficient operation of the traction power supply system. At present, the ideal solution is the co-phase power supply technology based on symmetrical compensation theory. By integrating the photovoltaic power generation system and the hybrid energy storage system with the DC bus of power flow controller, the utilization of regenerative braking energy, and peak-shaving and valley-filling of traction load can be further achieved to improve photovoltaic penetration rate. For this purpose, the optimal operation model of co-phase traction power supply system is established, which sets the minimum daily operation cost of traction substation as the objective, and takes the charging and discharging strategy of hybrid energy storage, photovoltaic output and power flow controller power as decision variables, and also takes into account the three-phase voltage unbalance constraint. The nonlinear constraints are linearized to formulate the mixed-integer linear programming model, which can be solved by programming solver CPLEX. The case study results show that the integration of photovoltaic and hybrid energy storage can effectively reduce 36.45% of daily operating cost, while the three-phase voltage unbalance meets the upper limit of 2% in the national standard.
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