Multi-Port Collaborative Control Strategy With Smooth Operational Transitions for Photovoltaics, Energy Storage, Direct Current, and Flexibility System

The photovoltaics, energy storage, direct current, and flexibility (PEDF) system requires coordinated control of distributed PV units, distributed ES units, dc distribution units, and the ac grid to supply power to various types of loads efficiently. This article designs a PEDF collaborative system based on a bipolar dc bus architecture, considering factors, such as port characteristics, voltage gain, and control complexity. Additionally, to prevent potential oscillations that may occur during the mode and control loop transitions in traditional collaborative control, this article proposes a multiport collaborative control strategy with smooth operational transitions. Finally, simulation and experimental results demonstrate the feasibility and effectiveness of the proposed strategy through stable multiport operation and smooth operational transitions under various conditions.