Seamless Entry Control Strategy for Redundant Modules of High-Frequency Bus Electric Energy Router

With the rapid development of renewable energy, high-frequency bus electric energy router that provides multiple ports for different sources and loads is gaining attention, and the application of redundant modules for electric energy router is necessary to improve the reliability of the system. However, the strong coupling characteristics of the common high-frequency bus structure can cause transient current dc bias and current fluctuation for redundant modules during the entry stage, which may result in overcurrent, device damage, and failed entry of redundant modules. This article proposes a partial module high-frequency current model to analyze the causes of transient current dc bias of redundant modules when entering into normal operation and designs a seamless entry control strategy for redundant modules to eliminate the current dc bias and achieve rapid entry into steady-state operation, which can remove the high-frequency current sampling process to simplify the control system. The feasibility of the proposed control strategy is verified by offline simulation and hardware-in-loop real-time simulation platform.