Abstract
The use of ex-transportation battery system (i.e. second life EV/HEV batteries) in grid applications is an emerging field of study. A hybrid battery scheme offers a more practical approach in second life battery energy storage systems because battery modules could be from different sources/ vehicle manufacturers depending on the second life supply chain and have different characteristics e.g. voltage levels, maximum capacity and also different levels of degradations. Recent research studies have suggested a dc-side modular multilevel converter topology to integrate these hybrid batteries to a grid-tie inverter. Depending on the battery module characteristics, the dc-side modular converter can adopt different modes such as boost, buck or boost-buck to suitably transfer the power from battery to the grid. These modes have different switching techniques, control range, different efficiencies, which give a system designer choice on operational mode. This paper presents an analysis and comparative study of all the modes of the converter along with their switching performances in detail to understand the relative advantages and disadvantages of each mode to help to select the suitable converter mode. Detailed study of all the converter modes and thorough experimental results based on a multi-modular converter prototype based on hybrid batteries has been presented to validate the analysis.
| Original language | English |
|---|---|
| Pages (from-to) | 547-563 |
| Number of pages | 17 |
| Journal | IEEE Journal of Emerging and Selected Topics in Power Electronics |
| Volume | 4 |
| Issue number | 2 |
| Early online date | 23 Jul 2015 |
| DOIs | |
| Publication status | Published - Jun 2016 |
Bibliographical note
© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Funding: EPSRC (EP/1008764/1).
Keywords
- boost-multilevel buck converter
- comparison
- hybrid battery energy storage system (HBESS)
- multiple battery types
- second-life battery energy storage systems (SLBESS)