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CHAI Jin,CHEN Alian,WANG Ruiqi,WANG Zhaoxin,CHAI Dongxin.Research on Dynamic Reconfiguration of Hybrid AC/DC Micro-grid[J].JOURNAL OF POWER SUPPLY,2019,17(2):109-116
Research on Dynamic Reconfiguration of Hybrid AC/DC Micro-grid
Received:July 12, 2017  Revised:October 31, 2018
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Keywords:AC/DC hybrid micro-grid  non-dominated sorting genetic algorithm-II(NSGA-Ⅱ)  load forecasting  dyn-amic reconfiguration
Fund Project:
CHAI Jin Engineering Training Center, Shandong University, Jinan , China
CHEN Alian School of Control Science and Engineering, Shandong University, Jinan , China chenalian@sdu.edu.cn
WANG Ruiqi Electric Power Research Institute, State Grid Shandong Electric Power Company, Jinan , China
WANG Zhaoxin State Grid Shandong Electric Power Company, Jinan , China
CHAI Dongxin Shandong Power Equipment Co., Ltd, Jinan , China
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      The architecture of existing micro-grid rarely changes during operation; however, the output power from micro-sources is random and intermittent, and the loads of micro-grid fluctuate widely. As a result, the micro-grid system is difficult to obtain the global optimal operation state. In this paper, the thought of dynamic reconfiguration of hybrid AC/DC micro-grid is proposed to reduce the energy flow between AC and DC buses, thus realizing the optimal operation of the hybrid DC/AC micro-grid. First, an architecture of hybrid AC/DC micro-grid is proposed in this paper, and the mathematical models in grid-connected and island modes are established, respectively. Then, the historical data of photovoltaic(PV) output power and the corresponding user load data of a PV power station in Shandong Province is taken as an example, and a very short-term load forecasting model and a PV output power prediction model are established based on support vector machine. On this basis, the architecture of hybrid micro-grid is dynamically optimized through the non-dominated sorting genetic algorithm-Ⅱ(NSGA-Ⅱ). The results of the numerical example show the effectiveness of reconfiguration thought for the proposed architecture.