Hard- and Soft-Switched
Technical Dialogue Session
DC-DC Converters I
Bidirectional Chopper, Battery Energy Storage System
A Battery energy storage system that is placed inside a dc electric railway vehicle is equipped with a bidirectional chopper that has heavy and bulky inductors. High-voltage-side and low-voltage-side current smoothing inductors are responsible for most of the chopper volume and mass. This paper presents an interleaved bidirectional chopper with auxiliary converters for onboard battery energy storage systems that is capable of achieving a significant reduction in the mass and volume of the current-smoothing inductors. This paper discusses the operating principles and the control method of the proposed chopper, followed by experiments performed on a 150-V, 3-kW downscaled experimental model.