Overcurrent Limiting in Grid-Forming Inverters: A Comprehensive Review and Discussion

Grid-forming (GFM) inverters are increasingly recognized as a solution to facilitate massive grid integration of inverter-based resources and enable 100% power-electronics-based power systems. However, the overcurrent characteristics of GFM inverters exhibit major differences from those of conventional synchronous machines. Accordingly, an in-depth characterization of GFM current-limiting strategies is needed to ascertain their performance during off-nominal conditions. Although GFM current-limiting controls are primarily necessary to protect the inverter power stage, they determine the inverter behavior during and after an off-nominal system disturbance. As a result, they can profoundly impact device-level…

• UD
  U.S. Department of Energy

  Awards: 38637, AC36-08GO28308, Contract No. DE-AC36-08GO28308, -AC36-08GO28308, 08GO28308
• OO
  Office of Energy Efficiency and Renewable Energy

  Awards: 38637, AC36-08GO28308, DE-AC36-08GO28308
• SE
  Solar Energy Technologies Office

  Award: 38637
• OO
  Office of Energy Efficiency
• NR
  National Renewable Energy Laboratory

  Awards: AC36-08GO28308, DE-AC36-08GO28308