Modal Analysis of Multi-virtual Synchronous Machine Grid-connected Power-frequency Oscillation

被引：0
|
作者：
Qin B. [1 ]
Xu Y. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Changping District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 19期
关键词：
Mechanical admittance model; Modal analysis; Multi-VSG; Power oscillation; Sensitivity analysis;
D O I：
10.13334/j.0258-8013.pcsee.201486
中图分类号：
学科分类号：
摘要：
The oscillation analysis method of virtual synchronous generator (VSG) based on the system transfer function needs to establish a complex high-order transfer function to determine the oscillation frequency, which requires a large amount of calculation and can't provide information such as the participation degree of various components. In this paper, a modal evaluation method was proposed to obtain the oscillation frequency and resonance influence range of multi-VSG grid-connected system by analyzing the loop impedance matrix. Firstly, the mechanical admittance model of multi-machine grid-connected system with VSG power frequency control loop was established by analogy method. Secondly, drawing lessons from the difference of series and parallel resonance characteristics in power system, the node admittance matrix and loop impedance matrix of the system were listed separately for modal analysis in order to verify the applicability of modal analysis method. And the sensitivity analysis method was further used to determine the participation degree of each VSG during oscillation. Then, by comparing with the frequency domain analysis method, the change rule of the key oscillation modes of the system was studied when the number of VSG, equivalent impedance of power grid, virtual moment of inertia and line impedance change, which could provide an important theoretical method for solving the power frequency oscillation problem in the application of new energy grid-connected projects with high permeability. Finally, the correctness and effectiveness of the above method were verified by building a simulation model of multi-VSG grid-connected system. © 2021 Chin. Soc. for Elec. Eng.
引用
收藏
页码：6570 / 6580
页数：10
相关论文
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