Reconnection of micro-grid from islanded mode to grid-connected mode used sliding Goertzel transform based filter
Reconnection of micro-grid from islanded mode to grid-connected mode used sliding Goertzel transform based filter
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DOI：
10.1049/iet-rpg.2016.0932
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发表时间：
2017-06
影响因子：
2.6
通讯作者：
Zheng Zeng;Weihua Shao
中科院分区：
文献类型：
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作者：
Zheng Zeng;Weihua Shao
微电网是可再生能源和公用事业之间的关键接口。微电网可以工作在孤岛模式和并网模式下。为了确认微电网从孤岛模式到并网模式的无缝转换，孤岛微电网与公用事业的同步是一个重要的挑战。在本研究中，用基于滑动 Goertzel 变换的滤波器代替一阶低通滤波器，提出了一种针对孤岛微电网逆变器应用的扩展锁相环控制策略。可以保证微电网电压与市电电压同步，保证微电网从孤岛模式到并网模式的无缝重连。考虑同步过程中微电网与市电电压偏差的影响，提出详细分析。提出了解析非线性模型和小信号模型来证明快速有效的重连性能。提供仿真和实验结果来验证所提出的控制策略的有效性和有效性。这项研究对于孤岛微电网的无缝变换控制很有意义。
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.