Effective Introduction of Superconducting Cables to DC Railway Feeding Systems

DC railway systems use a low feeding voltage, which can cause some problems such as excessive concentration of substation load, regeneration cancellation, and so on. Superconducting cables can be one of the effective solutions to these problems. MATLAB simulation models were developed to analyze DC railway feeding systems and to obtain their characteristics such as voltages, currents, power loads, and energy consumption. Two different model lines of DC feeding systems were used to investigate how the superconducting cables are to be introduced into the feeding systems for effective reduction of the substation power loads. The results show that we can determine the effective installation of superconducting cables from the data of power loads and output voltages of substations.