Hybrid battery-supercapacitor energy storage for enhanced voltage stability in DC microgrids using autonomous control strategy

Khalid Abdullah Khan, Ammar Atif, Muhammad Khalid

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

5 Scopus citations

Abstract

Renewable energy sources (RESs) introduce variations in a power grid that limit their integrative capacity in the power grid. The energy storage system (ESS) serves as a pertinent component, as an energy buffer, by compensating for demand-generation mismatch and smoothing the output power variability of RESs by operating as a dispatchable energy source and reducing the impact of RES variation. A meticulous consideration needs to be made for selecting ESSs. The commonly preferred battery ESSs (BESSs) facilitate numerous challenges associated with renewable integration. Nevertheless, due to low power density and slow dynamic response, BESS proves to incur high current stress and limit its application. Consequently, BESS is oversized and requires premature replacement. Therefore, hybridization of BESS with a supercapacitor ESS (SCSS) that facilitates high power density and possesses rapid dynamic response is conferred. Furthermore, the controller should be able to amply allocate low and high-frequency components to BESS and SCSS to substantially respond and compensate for the transient requirement of the system and regulate the DC-bus voltage. This chapter proposes the development of a decoupled controller framework using k- type compensators for BESS and a nonlinear PI controller for SCSS. The proposed controller framework is tested and validated on a solar Photovoltaics-powered microgrid system. Accordingly, an analytical comparison is presented with the benchmark low pass filter power frequency allocation technique to highlight the superiority and the enhanced response achieved with the proposed controller. Besides, the complexity of the proposed controller is comparatively simpler with a lower number of sensing devices that have a negative impact on the BESS-SCSS response over the transient variation intervals.

Original languageEnglish
Title of host publicationEmerging Trends in Energy Storage Systems and Industrial Applications
PublisherElsevier
Pages535-569
Number of pages35
ISBN (Electronic)9780323905213
ISBN (Print)9780323905220
DOIs
StatePublished - 1 Jan 2022

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Inc. All rights reserved.

Keywords

  • Microgrid
  • battery
  • hybrid energy storage systems
  • power allocation
  • supercapacitor
  • voltage regulation

ASJC Scopus subject areas

  • General Energy

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