September 21, 2022
Conference Paper

Positive-Sequence Phasor Modeling of Droop-Controlled, Grid-Forming Inverters with Fault Current Limiting Function

Abstract

Traditional positive-sequence phasor models of droop-controlled, grid-forming inverters do not have the fault current limiting function. During a short-circuit fault the model generates unrealistic high fault current making the simulation results less practical. This paper develops a fault current limiting function for the positive-sequence phasor model of droop-controlled, grid-forming inverters, which can effectively limit the inverter output current at the predefined maximum during faults. A user-written model has been developed for the commercially-available software Siemens/PTI PSS/E. Fault studies on a modified IEEE 39-bus system with all grid-forming inverters verify the effectiveness of the developed fault current limiting function. The proposed model can be used to evaluate how the limited fault currents of droop-controlled, grid-forming inverters impact the bulk power system transient stability under fault conditions.

Published: September 21, 2022

Citation

Du W., Y. Liu, R. Huang, F.K. Tuffner, J. Xie, and Z. Huang. 2022. Positive-Sequence Phasor Modeling of Droop-Controlled, Grid-Forming Inverters with Fault Current Limiting Function. In IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT 2022), April 24-28, 2022, New Orleans, LA, 1-5. Piscataway, New Jersey:IEEE. PNNL-SA-166355. doi:10.1109/ISGT50606.2022.9817530

Research topics