Analysis and Control of a Novel Modular-Based Energy Router for DC Microgrid Cluster

Abstract

Energy router is one of the key elements for power electronic-based DC micro-grid (DCMG) cluster system. Traditional ac/dc converter and solid-state transformer can act as an energy router, but their functions and interfaces are restricted. In this paper, a novel modular-based energy router (MBER) for DCMG cluster has been proposed to extend the functions of energy router. Each module of MBER is composed of an ac/dc converter and an isolated dual-active-bridge converter with high-frequency transformers. The power multidirectional exchange mechanism between ac grid and DCMG cluster is shown. Then, the operation mechanism and the operation modes of MBER are analyzed. Considering the operation range of MBER is limited by the operation modes and the dc voltage of each module, a dc voltage adjustment strategy and the control method have been proposed to expand the operation range of MBER. Finally, the simulation and experimental results are presented to validate the proposed topology and control methods.