Seamless Transfer Control Strategy Between Grid-connected and Islanding Operation for Synchronous Fixed-frequency Microgrid

被引：0
|
作者：
Bi Y. [1 ]
Xu B. [1 ]
Zhao Y. [1 ]
Cai F. [1 ]
Lu M. [1 ]
机构：
[1] School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo
来源：
Dianwang Jishu/Power System Technology | 2022年 / 46卷 / 03期
关键词：
Microgrid; No information interaction; Seamless transfer; Synchronous fixed-frequency current control; Tracking differentiator;
D O I：
10.13335/j.1000-3673.pst.2021.1245
中图分类号：
学科分类号：
摘要：
In the context of high proportions of the new energy and the power electronic devices, many distributed generations (DGs) with scattered layouts and random access in the microgrid do not have the communication conditions, which requires the grid-connected operation, islanded operation and the switching between these two states of the microgrid not rely on communication. This paper studies the grid-connected/ islanding seamless switching technology of the synchronous fixed-frequency microgrid without information interaction between the devices. Both an islanding state detection method using the satellite timing signal synchronization and a phase non-overshoot tracking method based tracking differentiator are proposed, which improve the speed and smoothness of the grid-connected to the islanding switching in the microgrid. A detection method of the grid connection status based on the frequency offset is proposed, which realizes the rapid switching from the synchronous-fixed frequency current control to the PQ control after the microgrid is reconnected to the grid. Simulation and experimental results verify the effectiveness and feasibility of the method proposed in this paper. © 2022, Power System Technology Press. All right reserved.
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页码：923 / 932
页数：9
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