Virtual Park-based control strategy for grid-connected inverter interfaced renewable energy sources

Çelik D., Meral M. E., Inci M.

IET RENEWABLE POWER GENERATION, vol.13, no.15, pp.2840-2852, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 15
  • Publication Date: 2019
  • Doi Number: 10.1049/iet-rpg.2019.0144
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2840-2852
  • Keywords: renewable energy sources, electric current control, reactive power control, power grids, reactive power, invertors, overcurrent protection, power generation control, distributed power generation, power supply quality, grid-connected inverter interfaced renewable energy sources, unbalanced grid faults, grid-connected IIRES, unbalanced grid fault conditions, maximum active power injection, active power oscillations, reactive power oscillations, peak current limitation control, control objectives, virtual park-based control strategy, reference current generator, RCG, controllability, overcurrent prevention, maximum current injection, inverter capacity, overcurrent protection, REACTIVE CURRENT INJECTION, POWER-CONTROL STRATEGIES, DUAL CURRENT CONTROL, DISTRIBUTED GENERATION, VOLTAGE, DESIGN, CONVERTERS, MAXIMIZE, SUPPORT, PLL
  • Van Yüzüncü Yıl University Affiliated: Yes


Unbalanced grid faults are the most severe perturbations which degrade the performance of grid-connected inverter interfaced renewable energy sources (IIRESs). In this regard, this study proposes a novel control strategy that provides optimum use of the power capability of the grid-connected IIRES under unbalanced grid fault conditions. One of the major contributions to previous methods is to propose a fast and robust improved Virtual Park (VP) sequence extractor to implement the reference current generator (RCG). The dynamic response of the grid-connected IIRES has also enhanced thanks to the proposed VP sequence extractor. The computing of maximum active power injection and simultaneously amplitude of phase currents is embedded into a new algorithm based the RCG to meet the aimed control objectives. The controllability and minimisation of active and reactive power oscillations are also formulated and carried out with only one control parameter. Another contribution of this study is to prevent overcurrent issues with peak current limitation control. Reference for active power is online computed based on the maximum current injection at inverter capacity for overcurrent protection. The validating effectiveness of the proposed solution is performed by a comprehensive set of cases to show the shortcomings of previous similar studies.