Overview of Power Management Strategies of Hybrid AC/DC Microgrid

TLDR

Conventional power systems are evolving toward smart grids dominated by microgrids with high renewable penetration, and hybrid AC/DC microgrids are seen as a likely future distribution structure, making power management strategies a critical operational aspect. This paper provides an overview of power management strategies for hybrid AC/DC microgrids, covering system structures, operation modes, and detailed control schemes in steady‑state and transient conditions, with illustrative examples. The authors analyze ac‑coupled, dc‑coupled, and ac‑dc‑coupled hybrid microgrid structures, examining multiple operation modes and a comprehensive set of power management and control schemes in both steady‑state and transient scenarios. The paper concludes with a discussion and recommendations for future research on power management strategies.

Abstract

Today, conventional power systems are evolving to modern smart grids, where interconnected microgrids may dominate the distribution system with high penetration of renewable energy and energy storage systems. The hybrid ac/dc systems with dc and ac sources/loads are considered to be the most possible future distribution or even transmission structures. For such hybrid ac/dc microgrids, power management strategies are one of the most critical operation aspects. This paper presents an overview of power management strategies for a hybrid ac/dc microgrid system, which includes different system structures (ac-coupled, dc-coupled, and ac-dc-coupled hybrid microgrids), different operation modes, a thorough study of various power management and control schemes in both steady state and transient conditions, and examples of power management and control strategies. Finally, discussion and recommendations of power management strategies for the further research are presented.