Integration Control of Renewable Energy/Hydrogen Energy System Based on Flexible DC Interconnection

Abstract

Wind/solar complementary for hydrogen production and hydrogen energy utilization have become one of the important directions for clean energy transformation and new economic growth point. This paper proposes a renewable energy/hydrogen energy system based on flexible DC interconnection and its coordinated control technology covering AC/DC voltage source converters and photovoltaic units, DC hydrogen production loads and energy storage devices. First, the typical structure of the renewable energy/ hydrogen energy system with low-voltage flexible DC interconnection is proposed, and the local control strategy of each unit is analysed, including the constant DC voltage control strategy and the constant active power control strategy. Then, coordinated control methods of renewable energy/hydrogen energy under different system operation states are proposed. Finally, a corresponding system simulation model and test platform are built, and then used to simulate and verify the proposed coordinated control method.