Improvement of the light-load regenerative brake control is effective for energy saving in DC-electrified railway systems. Light-load regenerative brake control gain is usually determined by a load shutdown test at a factory. The objective of this study is to develop a method to design light-load regenerative brake control gain though simulation of load shutdown. In this paper, a numerical simulation model of load shutdown test is introduced. Then, light-load regenerative brake control gain is designed by illustrating the behavior of the traction circuit system in the numerical simulation. The proposed method is verified by experimental test with a full scale vehicle traction system.
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