A Characteristic Analysis of Power Quality on Railway Distribution Power Network Connection with Regenerative Inverter in DC Railway System

In this paper, the matters to be considered by the regenerative inverter according to the low or high-voltage connection plan of the railway were analyzed to utilize the regenerative energy generated by the urban railway DC traction system. Criteria for various considerations such as energy flow, voltage fluctuations, and power quality of regenerative energy were presented when connecting the railway traction system. Power analysis simulations were used to analyze whether criteria were satisfied. The power analysis program PSCAD/EMTDC confirmed that the criteria were satisfied below the international standard IEEE-519 according to the low-voltage and high-voltage connection method.