不同虚拟同步机控制下双馈风机系统频率响应差异研究

doi:10.19595/j.cnki.1000-6753.tces.190787

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摘要

附加虚拟同步机控制的双馈风力发电机系统,其惯性支撑方面的控制效果可由系统传递函数矩阵的H₂/H_∞ 范数来定量描述。该文首先基于矩阵范数的定义,明确在以频率扰动为系统输入时,H₂/H_∞ 范数越小,系统频率振荡抑制的能力越强,惯性支撑效果越好。并结合经典的特征值稳定分析法,验证了上述相关性。然后建立双馈风机系统在不同虚拟同步机控制下的频率响应模型,比较三种控制策略在频率振荡抑制方面的控制效果。通过Matlab/ Simulink仿真验证了H₂/H_∞ 范数在评价系统频率响应方面的有效性,并以H₂ 范数最小为依据,确定了三种控制策略中主导控制参数的选择范围,对比分析了不同控制策略在频率响应方面的差异性。

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关键词 ：双馈风力发电机, 虚拟同步机, 频率响应, H₂/H_∞, 范数

Abstract：

The control effect of inertia support in the doubly-fed induction generator(DFIG) system controlled by virtual synchronous generator(VSG) can be quantitatively described by the H₂/H_∞ norm of the system transfer function matrix. Based on the definition of matrix norm, this paper determines that when the frequency disturbance is taken as the input of the system, the smaller the H₂/H_∞ norm is, the stronger the ability of system frequency oscillation suppression is, and the better the effect of inertia support is. The above correlation was verified by the classical eigenvalue analysis method. The frequency response models of the DFIG system under the controls of different VSG were established, and the control effects of three control strategies on frequency oscillation suppression were compared. Finally, the validity of H₂/H_∞ norm in evaluating system frequency response was verified by the simulation. Based on the minimum H₂ norm, the selection range of the dominant control parameters of the three control strategies was determined, and the difference in frequency response of different control strategies was compared and analyzed.

Key words： Doubly-fed induction generator (DFIG) virtual synchronous generator (VSG) frequency response H₂/H_∞ norm

收稿日期: 2019-06-30

PACS:

TM744

通讯作者: 高晗男,1994年生,硕士,研究方向为双馈风机的稳定及控制。E-mail：gaohan_dlut@163.com

作者简介: 章艳女,1980年生,副教授,研究方向为电力系统稳定及控制。E-mail：zy@dlut.edu.cn

引用本文:

章艳, 高晗, 张萌. 不同虚拟同步机控制下双馈风机系统频率响应差异研究[J]. 电工技术学报, 2020, 35(13): 2889-2900. Zhang Yan, Gao Han, Zhang Meng. Research on Frequency Response Difference of Doubly-Fed Induction Generator System Controlled by Different Virtual Synchronous Generator Controls. Transactions of China Electrotechnical Society, 2020, 35(13): 2889-2900.

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