A fast EMT simulation method for control and protection studies of microgrids

Abstract

In this work, ac-dc hybrid microgrids are studied, which contains inverter-interfaced distributed generators (DGs) and storages (DSs). As an effective way, electromagnetic transient (EMT) simulations are widely adopted for studies on control and protection strategies of these microgrids. However, detailed EMT simulations are time-consuming, especially for microgrids with many inverter-interfaced DGs/DSs. Based on model reduction, this paper proposes a fast EMT simulation method for microgrids. A piecewise averaged model (PAM) of inverter-interfaced DGs/DSs is established and integrated into the Electromagnetic Transient Program (EMTP). Using a microgrid with 2 PV generators and 1 battery energy storage system (BESS) as test system, the proposed method is verified by comparing simulation results with those obtained from a detailed model built in PSCAD/EMTDC. The results indicate that the proposed method can effectively speed up EMT simulation of microgrids with negligible lost in accuracy.