Abstract
This paper presents a non-isolated buck-boost bidirectional chopper with auxiliary converter for a battery energy storage system that is installed inside a light rail vehicle. The proposed chopper consists of two bidirectional chopper cells where one chopper cell is connected to each voltage side and an auxiliary converter that is connected in series with an inductor where the auxiliary converter consists of a cascade connection of multiple full-bridge cells. The proposed chopper is controlled such that the capacitors of the auxiliary converter store and release most of the converter energy instead of relying solely on a bulky and heavy inductor. As a result, the proposed chopper is lighter and smaller than the conventional four-switch non-inverting buck-boost converter. The operation of the proposed chopper has been validated by experiments performed on a downscaled experimental model.
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