Experimental Investigation and Adaptability Analysis of Hybrid Traction Power Supply System Integrated With Photovoltaic Sources in AC-Fed Railways

To realize energy conservation and emission reduction of railways, as well as alleviate the contradiction between supply and demand of energy, a hybrid traction power supply system integrated with photovoltaic sources (HTPSS-PVSs) is proposed. HTPSS-PVS can achieve the on-site access and consumption of photovoltaic (PV) sources along the railway line, without affecting the original structure of the traction power supply system (TPSS). Considering the strong stochastic volatility of traction loads and PV sources, the adaptability of HTPSS-PVS is analyzed to fully reveal the dynamic interaction mechanism among different subsystems, particularly in port electrical quantity and power quality. The quantitative evaluation methods of different power quality indices are also introduced after PV access. Afterward, the joint simulation and experimental investigation of the whole system are carried out. The results not only demonstrate the feasibility of the proposed scheme but also point out that this coupling system has good adaptability. Compared with other schemes, it can be easily applied to the majority of conventional ac-fed two-phase TPSSs already operated or under construction due to their lower investment cost and shorter construction cycle. Finally, the relevant application suggestions are given to better match different tradeoff indicators and operation modes of the system.