Modular ESS with second life batteries operating in grid independent mode

Nilanjan Mukherjee, Dani Strickland

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This work is part of a bigger project which aims to research the potential development of commercial opportunities for the re-use of batteries after their use in low carbon vehicles on an electricity grid or microgrid system. There are three main revenue streams (peak load lopping on the distribution Network to allow for network re-enforcement deferral, National Grid primary/ secondary/ high frequency response, customer energy management optimization). These incomes streams are dependent on the grid system being present. However, there is additional opportunity to be gained from also using these batteries to provide UPS backup when the grid is no longer present. Most UPS or ESS on the market use new batteries in conjunction with a two level converter interface. This produces a reliable backup solution in the case of loss of mains power, but may be expensive to implement. This paper introduces a modular multilevel cascade converter (MMCC) based ESS using second-life batteries for use on a grid independent industrial plant without any additional onsite generator as a potentially cheaper alternative. The number of modules has been designed for a given reliability target and these modules could be used to minimize/eliminate the output filter. An appropriate strategy to provide voltage and frequency control in a grid independent system is described and simulated under different disturbance conditions such as load switching, fault conditions or a large motor starting. A comparison of the results from the modular topology against a traditional two level converter is provided to prove similar performance criteria. The proposed ESS and control strategy is an acceptable way of providing backup power in the event of loss of grid. Additional financial benefit to the customer may be obtained by using a second life battery in this way.
Original languageEnglish
Title of host publication3rd IEEE international symposium on power electronics for distributed generation systems (PEDG)
PublisherIEEE
Pages653-660
Number of pages8
ISBN (Electronic)978-1-4673-2022-1
ISBN (Print)978-1-4673-2021-4
DOIs
Publication statusPublished - 2012
Event3rd IEEE international symposium on power electronics for distributed generation systems (PEDG) - Aalborg, Denmark
Duration: 25 Jun 201228 Jun 2012

Conference

Conference3rd IEEE international symposium on power electronics for distributed generation systems (PEDG)
CountryDenmark
CityAalborg
Period25/06/1228/06/12

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Keywords

  • energy storage system
  • grid independent operation
  • second-life batteries
  • voltage and frequency control

Cite this

Mukherjee, N., & Strickland, D. (2012). Modular ESS with second life batteries operating in grid independent mode. In 3rd IEEE international symposium on power electronics for distributed generation systems (PEDG) (pp. 653-660). IEEE. https://doi.org/10.1109/PEDG.2012.6254072