4.8 Article

Bidirectional Single-Stage Grid-Connected Inverter for a Battery Energy Storage System

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 64, Issue 6, Pages 4581-4590

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2016.2559453

Keywords

Battery energy storage system; grid-connected inverter

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The objective of this paper is to propose a bidirectional single-stage grid-connected inverter (BSG-inverter) for the battery energy storage system. The proposed BSG-inverter is composed of multiple bidirectional buck-boost type dc-dc converters (BBCs) and a dc-ac unfolder. Advantages of the proposed BSG-inverter include: single-stage power conversion, low battery and dc-bus voltages, pulsating charging/discharging currents, and individual power control for each battery module. Therefore, the equalization, lifetime extension, and capacity flexibility of the battery energy storage system can be achieved. Based on the developed equations, the power flow of the battery system can be controlled without the need of input current sensor. Also, with the interleaved operation between BBCs, the current ripple of the output inductor can be reduced too. The computer simulations and hardware experimental results are shown to verify the performance of the proposed BSG-inverter.

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