Control of Second-Life Hybrid Battery Energy Storage System Based on Modular Boost-Multilevel Buck Converter

Analysis and Comparative Study of Different Converter Modes in Modular Second-Life Hybrid Battery Energy Storage Systems

“…Moreover, the presence of hybrid batteries within an ESS provides the opportunity to optimize the system and also provides additional flexibilities. To address this, a generalised boost-buck type of dc-side modular converter using different battery modules was described in [29] as shown in Fig. 1.…”

“…1. Within ref [29], the operation of a new boost-buck mode with its associated control structure for hybrid battery integration was described and an experimental study showing feasibility was undertaken under a couple of different operating conditions. However, no detailed description of other operating modes and practical considerations around switching performance and efficiency although alluded to were not quantified or compared.…”

“…A suitable topology was proposed in [29]. Three operational modes are possible in the converter shown in Fig.…”

“…There could be two types of PWM methods in this mode: a) a phase shifted multiple carrier PWM method where the same control signal is used as reported in [33] and b) uniform carrier method where the control signals are different as described in [29]. Both generate a multilevel voltage across the dc-link inductance (L dc ) as shown in Fig.…”

Control of Cascaded DC-DC Converter Based Hybrid Battery Energy Storage Systems: Part – I: Stability Issue

“…In addition to changes in chemistry, battery sizes are continuous adapting to meet the requirements of the vehicles. Therefore, one of the major challenges of a second life battery energy storage system is to make sure it is not tied to any one chemistry or module size but can integrate different types of batteries with different characteristics into a grid connected converter as reported in [4].…”