A study on regenerative breaking energy on electric multiple unit train

Korean-style EMU(Electric Multiple Unit) train which was developed by Korea Railroad Research Institute (KRRI) has been in trial operation on Honam, Jonngang, Choongbuk and Taebaek line. In this study, the voltage supplied to EMU Train in trial operation was monitored and analyzed to identify the voltage condition supplied by the existing railroad. To directly measure the voltage supplied to EMU Train, PT was installed at the bottom of ttain pantograph for monitoring the primary voltage of the transformer, and for accurate measuring, surrounding environment and conditions were recorded and the analysis of stringing voltage using CBEMA curve was conducted. As a result, some of the section on Honam, Jonngang and Taebaek line were supplied 110[%] pf rated voltage (25 [kV]) for more than 200[s] frequently exceeding 110[%] Taebaek line appeared to have had the installed voltage in worst condition. The analyzed data is expected to be helpful in stabilizing the power system and power conversion system of train which will run Jonngang and Taebaek line.