A hierarchical distributed control architecture for CHB converter with Integrated Battery Energy Storage

A hierarchical distributed control architecture for CHB converter with Integrated Battery Energy Storage

Jothi M Lexmi Devi ^1,*, Sharly R A ²

¹ ME Student, Department of PSE, Maria College of Engineering and Technology, Attoor

² Assistant professor, Department of PSE, Maria College of Engineering and Technology,  Attoor

Abstract— Cascaded H-bridge topology has been used in grid tied converters for battery energy storage system due to its modular structure. To fully utilize the converter’s modularity, this paper proposes a hierarchical distributed control architecture that consists of primary control, secondary control and battery state of charge (SOC) balancing control. Primary control ensures accurate current tracking while a distributed secondary control based on consensus algorithm is presented to regulate power sharing among modules and is proved to be stable theoretically. A distributed SOC balancing control is further introduced to improve energy efficiency of battery energy storage system. Finally, the hierarchical distributed control strategy is implemented using hardware controllers and a software platform. Besides, a carrier phase shift control is also implemented to achieve multilevel output voltage and harmonic reduction. The experimental results demonstrate the performance of the proposed control scheme effectively.

Keywords—: Battery SOC balancing, cascaded H-bridge, consensus algorithm, distributed control.