Impact of Inertia-Less Generation on Coherency and Damping of Electro-Mechanical Modes

This paper explores the impact of replacing the inertial contribution of conventional synchronous generators connected in the grid by zero inertia renewable energy sources (RES). The impact of such generation transition on the grouping of coherent generators is also studied. The study is performed on the IEEE 68-bus test system. The synchronous generators of the system are replaced by RES one at a time and the electromechanical modes related to the inter-area oscillations are comparatively studied. For eigenvalue analysis, the NETOMAC module of PSS/E software is used.