Pre-synchronization Control Strategy of Virtual Synchronous Generator in Islanded Microgrid with Heterogeneous Distributed Generators

被引：0
|
作者：
Lan Z. [1 ,2 ]
Diao W. [1 ]
Zeng J. [1 ]
He D. [1 ]
Tu C. [2 ]
Jiang F. [3 ]
机构：
[1] College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou
[2] National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha
[3] College of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2022年 / 46卷 / 19期
基金：
中国国家自然科学基金;
关键词：
heterogeneous distributed generator; islanded microgrid; phase angle difference jump; phase-locked loop (PLL); pre-synchronization; virtual current; virtual synchronous generator (VSG);
D O I：
10.7500/AEPS20211129006
中图分类号：
学科分类号：
摘要：
In the weak power grid environment of the islanded microgrid with heterogeneous distributed generators, the virtual synchronous generator (VSG) based on the phase difference control produces frequency fluctuation due to the periodic jump of the phase angle difference, and the coupling of the phase-locked loop (PLL) and the weak power grid affects it, which easily leads to the instability of VSG and even system collapse. Therefore, a pre-synchronization control strategy of VSG based on the virtual current is proposed. First, the jump mechanism of the phase angle difference is briefly analyzed to reveal its influence on the grid-connection process of VSG. Then, the input variable of the phase angle controller is improved based on the virtual current for eliminating the jump of the phase angle difference, to improve the frequency stability of the grid-connection of VSG and realize the pre-synchronization without PLL. On this basis, a small-signal model is established, and the effects of different parameters on the pre-synchronization process are analyzed, while reasonable controller parameters are designed to improve the dynamic performance of the system. Finally, the simulation on MATLAB/Simulink and the hardware-in-loop experiment on StarSim verify the effectiveness of the proposed strategy. © 2022 Automation of Electric Power Systems Press. All rights reserved.
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页码：154 / 161
页数：7
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