Chopperless Fault Ride-Through Control for DC Microgrids

The dc microgrid should remain connected to the ac utility grid support stability during faults. However, bidirectional power flow between and will cause either high-voltage or low-voltage faults at bus. It is difficult control a large number of heterogeneous sources bus ride through fault, as well exporting reactive current grid. This article proposes chopperless fault ride-through strategy for microgrid. proposed utilizes controllability microgrids without using chopper circuit on side balance system power. Following goals are achieved by this strategy: 1) maximizing output grid; 2) reducing voltage ripples; 3) realizing decentralized emergency among different distributed generators. effectiveness method has been validated related case studies in both simulation hardware-in-loop (HIL) tests.