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Modeling and Coordinated Control of Island DC Hybrid System of Wind/PV /Electrolyzer and BESS

With the development of energy technology, hybrid wind/photovoltaic (PV)/hydrogen production system will become a typical application scenario. In this paper model and coordinated control of wind, PV, electrolyzer (EL) and battery storage system (BESS) is proposed. Firstly, the model of hybrid system is built up based on dc microgrid. Then, a new hierarchical control strategy is designed for keeping power balance and safety of hybrid system. The proposed control strategy consists of two parts: power supervisory control and local control. The power supervisory control is responsible for supervising the power balance hybrid system and equipment operation status, necessarily given the limited power command for Wind/PV. The local control is presented to realize autonomous control of local equipment, which is a kind of distributed method. Here the voltage-power droop control and dc bus signaling (DBS) is introduced for EL and BESS; a hybrid control combining maximum power tracking (MPPT) and constant power generation control (CPGC) is utilized for wind/PV. A general wind/PV/hydrogen production system based on DC microgrid is studied as an example to verify the effectiveness of the proposed control strategy. The simulation results show the proposed method has a good performance and security in isolated mode.