Event‐triggered distributed secondary control for enhancing efficiency, reliability and communication in island mode DC microgrids

Abstract

AbstractAlthough distributed secondary control helps control microgrids, it can provide insufficient performance in some cases where the system includes both renewable energy sources (RESs) and energy storage systems (ESSs). Therefore, an improved distributed secondary control structure is proposed in this study to improve efficiency and reliability in island mode DC microgrids that include RESs and ESSs. In order to regulate the power flow in accordance with the real time generation of the sources, maximum power calculation algorithms have been created within the secondary control levels of the PV and wind controllers. Furthermore, a fuzzy logic‐based energy management system has been designed in the secondary control of the battery controller to manage the power flow of the whole system considering the battery charge states and the total power generated by RESs. The distributed secondary control operates in event‐triggered mode to reduce the communication burdens. To avoid zeno behavior, event‐triggered control is designed based on sampled data. The proposed control scheme has been tested in Simulink environment and its stability is verified using Lyapunov's stability criteria. Results show that the power demand is successfully provided proportionally among the RESs and the communication burden is reduced considerably.