Experimental Transient Stability Analysis of MicroGrid systems: Lessons learned

A Transient Stability Analysis of a low inertia microgrid system is presented in this paper. The analysis is performed on experimental data collected for different case scenarios of grid disturbances. The test bed consists of a reconfigurable 100kW MicroGrid system with more than 10 rotating generators, PV, and Wind penetration capabilities. Both islanded and non-islanded situations are considered for a solid three phase fault analysis and comparison. The paper also presents the results of fault scenario when the rotating machines are pushed to an unstable region. The experimental results and system behavior observed show interesting phenomena. The MicroGrid showed higher resiliency for faults than expected even if the relative angles are more than 160° and even if the fault is sustained for a long time.