Stability of Grid-edge Distribution System with Grid-forming and Grid-following Resources: An Australian Case Study
Muhammad Ismail, Rakibuzzaman Shah, Nima Amjady, Syed Mofizul Islam, Md. Sazal Miah · 2024
Modern power systems are shifting with significant penetration of inverter-based resources. Grid-forming (GFM) generators with grid-following (GFL) resources are anticipated to dominate next-generation power systems. Inverter-based resources (IBRs) are changing the dynamics of the distribution systems. Significant work has been done in the device-level solution of the GFM. However, the system-level studies in distribution systems are still limited. This paper reveals the composite stability behaviour (i.e., combined stability performance of the system with two or more stability characteristics) of a medium voltage (MV) distribution system with GFM and GFL resources. The MV network from regional Australia has been used for the study. Significant variations of the composite stability margin could be observed under the WECC composite load model in the MV distribution system. The control parameters' heterogeneity significantly impacts the composite stability of the distribution system considered for this study.