An Enhanced Power Quality and Smooth Transition Control Strategy for a Microgrid without Remote Pre-Synchronization Communication

被引：0
|
作者：
Guo H. [1 ]
Meng X. [1 ]
He M. [1 ]
Liu X. [1 ]
Liu J. [2 ]
机构：
[1] School of Electrical Engineering, Sichuan University, Chengdu
[2] School of Electrical Engineering, Xi'an Jiaotong University, Xi'an
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2022年 / 37卷 / 10期
关键词：
Grid-connected mode; Power quality; Pre-synchronization; Seamless transition; Stand-alone mode;
D O I：
10.19595/j.cnki.1000-6753.tces.210575
中图分类号：
学科分类号：
摘要：
The paper proposes a smooth transition control strategy for microgrids with high power quality and no need for remote communication lines. The microgrid is mainly composed of multiple parallel distributed power generation units and a pre-synchronization unit. A unified grid-connected current control structure is proposed for the interface inverter in the distributed power generation unit, which has the following advantages: ① Without island detection, the inverter can automatically switch between the current control state of the grid-connected mode and the voltage control state of the stand-alone mode to ensure the load power supply quality; ② The proposed unified grid-connected current control structure can effectively suppress the harmonics in grid-connected current and capacitor voltage; ③ When the grid frequency fluctuates, the inverter can still output the corresponding active and reactive power according to the command value, and can synchronize with the grid without a phase-locked-loop or a frequency-locked-loop in the grid-connected operation state. In addition, the proposed pre-synchronization unit can realize the pre-synchronization control of the microgrid voltage and the grid voltage without relying on the remote communication lines. It also reduces the inrush current when the stand-alone operation state changes to the grid-connected operation state. Finally, the control parameters are optimized, and the effectiveness and feasibility of the proposed control strategy are verified through experiments. © 2022, Electrical Technology Press Co. Ltd. All right reserved.
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页码：2611 / 2621
页数：10
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