This section presents the verification of the models and algorithms implemented in ANDES by comparing the time-domain simulation results with commercial tools.

ANDES produces identical results for the IEEE 14-bus and the NPCC systems with several models. For the CURENT WECC system, ANDES, TSAT, and PSS/E produce slightly different results. In fact, results from different tools can hardly match for large systems with a variety of dynamic models.