Transient Instability Analysis and Its Stability Strategies for Islanded Microgrid With Heterogeneous Micro-source

被引：0
|
作者：
Lan Z. [1 ,2 ]
Wu F. [1 ]
Yu X. [1 ]
He D. [1 ]
Tu C. [2 ]
Xiao F. [2 ]
机构：
[1] College of Electrical and Information Engineering, Hunan University of Technology, Hunan Province, Zhuzhou
[2] National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Hunan Province, Changsha
来源：
Dianwang Jishu/Power System Technology | 2023年 / 47卷 / 11期
基金：
中国国家自然科学基金;
关键词：
heterogeneous micro-source; model prediction; synchronous generator; transient instability; virtual synchronous generator;
D O I：
10.13335/j.1000-3673.pst.2022.1896
中图分类号：
学科分类号：
摘要：
To improve the inertia of the microgrid, some distributed renewable energy sources are often connected in as the virtual synchronous generators to form a heterogeneous micro-source system operating in parallel with the conventional synchronous generators. Due to the remarkable differences in their physical structures and dynamic characteristics of these two micro-sources, they are prone to some transient instability problems such as the power-frequency oscillations in the isolated microgrids under a large disturbance. In this paper, the oscillating equations of the parallelled system with the heterogeneous micro-sources are established to analyze the transient instability mechanism of the system under the large disturbance; Furthermore, the VSG additional torque control method based on the model prediction is proposed, and the selection principle of the main control parameters is given. The angular frequency and its torque increments of the parallelled system are used as the input to attenuate the effects of the differences in their characteristics between the micro-sources so as to improve the transient stability of the system. Finally, the correctness and effectiveness of the theoretical analysis and the control method are verified in the MATLAB/Simulink simulation and the StarSim hardware-in-the-loop semi-physical experiments. © 2023 Power System Technology Press. All rights reserved.
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页码：4585 / 4597
页数：12
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