Development of DC/DC Converter for Battery Energy Storage Supporting Railway DC Feeder Systems

This paper describes the development of a bilateral dc/dc converter rated at 1500 V with a peak power of 500 kW for battery energy storage systems supporting railway dc feeder systems. The dc/dc converter converts regenerated power from a braking train and charges the batteries. The dc/dc converter discharges the stored energy to feed the train during powering. The converter main circuit and the control system are described, and successful test results obtained at the factory are reported. For the main circuit test, a special test method was applied. For the control system test, a real-time digital simulator was used for hardware-in-loop tests. In addition to the converter tests, the results from dc feeder system tests with an actual rectifier and battery bank are also presented.