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Control and experiment of a bidirectional chopper with an auxiliary converter
Author(s) -
Ohnishi Haruna,
Hagiwara Makoto
Publication year - 2019
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.12135
Subject(s) - chopper , inductor , ripple , pulse width modulation , voltage , cascade , capacitor , control theory (sociology) , boost converter , braking chopper , electrical engineering , electronic engineering , engineering , computer science , control (management) , chemical engineering , artificial intelligence
A conventional medium‐voltage large‐capacity bidirectional chopper used in a battery energy storage system for DC electric railways is equipped with a heavy and bulky inductor for current smoothing. This paper presents the experimental verification of a bidirectional chopper with an auxiliary converter for the purpose of reducing the size and weight of an inductor. The auxiliary converter is formed by the cascade connection of multiple single‐phase full‐bridge converter cells. Applying the so‐called “phase‐shifted PWM” to each of the cells can reduce the voltage step across an inductor and increase the ripple frequency, resulting in a significant reduction in size and weight of the inductor. This paper discusses the operating principles and control method of the bidirectional chopper, followed by experiments using a 150‐V, 2‐kW down‐scaled model.