Control strategy for Inertia Emulation through Grid-Following Inverters

The concern for the environment and the current economic situation result in the growing search for renewable means of energy generation. However, renewable sources of electrical energy interfaced by inverters do not have the same inertia and damping that exists in synchronous machines. The lack of inertia resulting from the high level penetration of renewable energies can lead to increased frequency excursions and, consequently, to system instability. In order to reduce this unwanted effect, this study, proposes the development of a control strategy to emulate inertia through a grid-following inverter. After simulations in a system with solar photovoltaic energy generation connected to a grid with infinite bus, results show the effectiveness of inverter control with virtual inertia. Grid-following Inverter, Virtual Inertia, Renewable Energy Sources, Power System Stability.