Comparison of Cascaded H-Bridge and Modular Multilevel Converters for BESS application

This paper compares the Cascaded H-Bridge (CHB) converter topology with the Modular Multilevel Converter topology (M
²
LC) for the use in battery energy storage systems (BESS). Standard modules are examined as well as extended modules allowing an increase in output voltage. Semiconductor and capacitor requirements are evaluated by simulation, and practical considerations are discussed. Experimental results from a laboratory setup of a CHB based BESS are presented.