Small-signal Modeling and Analysis of Cascade Half-bridge Battery Energy Storage System with Distributed Control

Zuoxing Wang, Yibin Tong, Qiang Cui, Jinling Meng, Guangbin Liu

Abstract


This paper focus on the echelon use of batteries. One of the flexible battery group technologies is the cascade half-bridge battery energy storage system with distributed control. It has the advantages of simpler structure, higher reliability, lower cost and it is easier to achieve fault-tolerant. In the paper, the classical droop control method in Microgrid is introduced to the current control of series system. The small-signal model is built at first. By using impedance analysis and characteristic root analysis, the anti-disturbance capability of the system is analyzed,with the current source control and bus voltage source disturbing in different module numbers or inductances. At last, cascade half bridge experimental equipment is designed, constructed and tested to verify the analysis and stable operation.

Keywords


Echelon use of batteries; Flexible battery group technology; Distributed control; Anti-disturbance capability


DOI
10.12783/dteees/iceee2018/27791

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