Hierarchical control scheme for proportional power sharing and robust operation in multiple virtual synchronization‐based DC/DC converters

Virtual synchronization control can be applied to DC/DC converter for enhanced inertia support by imitating the rotor dynamics of synchronous generator (SG). However, efficient power sharing and robust operation ability cannot guaranteed in a multiple parallel-operated converters system. This paper proposes hierarchical scheme achieve higher efficiency superior anti-disturbance with virtual synchronization-based control. The primary layer enables proportional using improved each converter, which aims at eliminating influence line parameter mismatch among converters. secondary deals DC voltage stability improvement through extended disturbance-observer-based backstepping consideration external fluctuation on whole Two levels are integrated as architecture realize different objectives time scales, while only neighbouring communications information needed Simulations PSCAD/EMTDC conducted show that load is accurately proportionally shared, system oscillations eliminated control, validates advantages proposed scheme.