ZHANG Yun-long, KANG Kai, TANG Chang, ZHENG Kai-qi, SHI Nian, CAO Chuan-sheng
Abstract: The structure of the AC/DC hybrid microgrid is the basis of energy management, control, protection and stability. According to the characteristics of the AC/DC hybrid microgrid, a networking design process based on the principle of energy conservation and the principle of zoning and hierarchical matching is proposed. On this basis, the improved master-slave coordination control strategy of AC/DC hybrid microgrid is proposed, and a new type of master controller is adopted. When the energy storage inverter is switched from PQ control to V/f control, it can overcome the transient moment and produce large voltage, frequency and power fluctuations, so as to ensure the safe and stable operation of the microgrid. Based on an actual PV-wind-storage-diesel microgrid project, the topology structure was designed and the PSCAD simulation model was set up, which verified the effectiveness of the proposed networking design and master-slave control strategy,and provided a reference for the planning, design and operation of large-scale AC/DC hybrid microgrid in the future.
Key words: hybrid microgrid; networking method; new type of master controller; stable operation
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