An Asymmetrical Connection Balance Transformer-Based Hybrid Railway Power Conditioning System With Cost-Function Optimization

For solving the emerging power quality problems in electrified railway, an asymmetrical connection balance transformer-based hybrid railway power conditioning system with cost-function optimization (ACBT-HRPC) is proposed in this paper. Compared with other balanced traction transformers, the ACBT is characterized with a much higher material utilization, which really matters in practical applications. Besides, the inductively filtered rectifier transformer, with filter-tuned branches used for filtering harmonics and compensating reactive power, is used as a coupling stage of hybrid railway power conditioning system. The mathematical relationship between power factor and design capacity is analyzed, and the costfunction optimization has been proposed to minimize the investment of ACBT-HRPC, which enables a satisfactory compensation performance with relatively attractive costs. Both the simulation and experimental results verify the effectiveness of ACBT-HRPC.