Coordinated Control Strategies for On-Grid/Off-Grid Operation of Photovoltaic-Storage-Hydrogen Microgrid System

With the rapid development of the new energy industry and related technologies, photovoltaic-storage-hydrogen (PV-storage-hydrogen) microgrid systems have emerged. These systems deeply integrate photovoltaic, energy storage, and hydrogen energy technologies to address the issue of photovoltaic power consumption. To tackle the instability problems of PV-storage-hydrogen microgrid systems during grid-connected and off-grid operation and switching, this study starts from the design of the energy storage system. Under the condition of a photovoltaic output power of 600 kW, the selection and capacity configuration of the storage system (200 kW/400 kWh) were determined through transient characteristic simulations and annual photovoltaic power generation simulations. Furthermore, an operational architecture of the PV-storage-hydrogen microgrid system was constructed, and corresponding coordinated control strategies were formulated based on different operating conditions, thereby enhancing the stability and safety of system operation.