期刊
IET RENEWABLE POWER GENERATION
卷 11, 期 7, 页码 1041-1048出版社
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-rpg.2016.0932
关键词
distributed power generation; power generation faults; renewable energy sources; synchronisation; low-pass filters; phase locked loops; invertors; microgrid; islanded mode; grid-connected mode; sliding Goertzel transform based filter; renewable energy sources; synchronisation; firstorder low-pass filter; extended phase-locked loop; inverter applications; voltage deviation; synchronisation process; analytical nonlinear model; small-signal model; seamless transform control
资金
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2016jcyjA0108]
- National Natural Science Foundation of China [51607016]
The micro-grid is a key interface between renewable energy sources and the utility. A micro-grid can work under islanded mode or grid-connected mode. To confirm the seamless transform of a micro-grid from islanded mode to grid-connected mode, synchronisation of the islanded micro-grid to the utility is an essential challenge. In this study, replacing first-order low-pass filter by sliding Goertzel transform based filter, a control strategy with an extended phase-locked loop is presented for the inverter applications in islanded micro-grids. It can ensure the synchronisation between the micro-grid voltage and the utility voltage, and guarantee the seamless reconnection of the micro-grid from islanded mode to grid-connected mode. Considering the influence of the voltage deviation between the micro-grid and the utility voltages in the synchronisation process, detailed analyses are proposed. Analytical non-linear model and small-signal model are presented to prove the fast and effective reconnect performance. Simulated and experimental results are provided to verify the validity and effectiveness of the proposed control strategy. This study is of interest for the seamless transform control of islanded micro-grids.
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