Multi-objective control scheme for operation of parallel inverter-based microgrids during asymmetrical grid faults

Çelik D., Meral M. E.

IET RENEWABLE POWER GENERATION, vol.14, no.13, pp.2487-2498, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 14 Issue: 13
  • Publication Date: 2020
  • Doi Number: 10.1049/iet-rpg.2020.0057
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Agricultural & Environmental Science Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Compendex, Computer & Applied Sciences, Greenfile, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.2487-2498
  • Keywords: overcurrent protection, power generation faults, electric current control, reactive power, invertors, power generation control, distributed power generation, power distribution faults, power distribution control, multiobjective control scheme, parallel inverter-based microgrids, asymmetrical grid faults, distributed generation units, utility grid, ancillary services, reactive power oscillations, overcurrent problem, parallel operated grid-connected inverters, GCI, PCC, overcurrent protection, reactive power injection, reactive power support capability, FRT requirements, grid-connected multiDG units, current restraining control, parallel operation, adjustable control coefficients, fault ride-through capability, point of common coupling, RIDE-THROUGH, INTERFACING CONVERTERS, VOLTAGE UNBALANCE, SUPPORT, DROOP, CAPABILITY, QUALITY
  • Van Yüzüncü Yıl University Affiliated: Yes


The growing interest in connecting more distributed generation (DG) units to the utility grid, microgrids deal with the various challenges to satisfy a sufficient level of ancillary services such as active power oscillations (APOs), reactive power oscillations (RPOs), fault ride-through (FRT) capability, and overcurrent problem. Hence, for parallel operated grid-connected inverters (GCIs) based MG, this study presents a multi-objective control scheme that simultaneously ensures elimination of the collective APOs/RPOs at point of common coupling (PCC), overcurrent protection and reactive power injection. One of the significant parts of this study compared with similar existing studies is that provides reactive power support capability to fulfil the FRT requirements of the grid-connected multi-DG units and to remain grid-connected during asymmetrical grid faults. A current restraining control is also presented to ensure the safe operation of the MG system and to avoid overcurrent. The cancellation of the collective APOs and RPOs at the PCC for parallel operation of the GCIs has been achieved by using adjustable control coefficients and demonstrated with theoretical analyses in detail. Extensive case studies are presented and discussed to demonstrate the performance of the proposed ideas and to meet the shortcomings of the previous studies.