A Centralized DC Bus Voltage Control Scheme for Isolated DC-DC Converters in Standalone DC System

This article proposes a centralized DC bus voltage control scheme for isolated DC-DC converters in a standalone DC system, which achieves dc-bus voltage restoration based on voltage shifting. The energy management system (EMS) estimates the DC voltage with the aid of a voltage estimator and mitigates the dc-bus voltage deviation by shifting the output voltage reference among isolated DC-DC converters. The proposed scheme suppresses the need for a complex control structure and DC bus voltage measurement. A proposed control scheme for a small-scale DC system is evaluated by using PLECS simulation.