Iterative approach to impedance model for small-signal stability analysis
Iterative approach to impedance model for small-signal stability analysis
复制标题
用于小信号稳定性分析的阻抗模型迭代方法
DOI：
10.1049/iet-rpg.2018.5265
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发表时间：
2018
影响因子：
2.6
通讯作者：
Ma Hongwei
中科院分区：
文献类型：
--
作者：
Wang Liang;Peng Jingyu;You Yuyang;Ma Hongwei
阻抗分析在电力系统和电力电子装置的小干扰稳定性分析中有着广泛的应用。本研究提出了一种迭代的方法来建立单个器件的阻抗模型。该方法在阻抗模型的计算中采用数值迭代的方法，而不是复杂的数学推导。它很容易在计算机程序中实现。首先，设置目标设备的关键阻抗/导纳的初始值。其次，根据器件的结构和各元件的传递函数，设计了一种迭代算法。最后，计算了系统的等效阻抗，分析了系统的稳定性。所获得的模型可以包括申报器械的所有元件，例如锁相环和轴系统。因此，它也可以应用于次同步控制相互作用和扭转相互作用的分析。所提出的方法可以提供来自目标设备的不同部分的阻抗贡献。这一特性将有利于系统失稳的分析和解决。
Impedance analysis has been widely used in small‐signal stability analysis of power systems and power electronic device. This study proposes an iterative approach to impedance model of individual device. The proposed method applies numerical iteration in the calculation of impedance model instead of complex mathematical derivation. It is easy to be implemented in computer programs. First, initial value of a key impedance/admittance of the target device is set. Second, an iterative algorithm is designed according to structure of the device and transfer functions of its components. Finally, the equivalent impedance is computed and stability characteristics of the whole system are analysed. The obtained model could include all elements of the target device, such as phase‐locked loop and shaft system. Thus, it could also be applied to the analysis of sub‐synchronous control interaction and torsional interaction. The proposed method could provide impedance contribution from different parts of the target device. This character will benefit the analysis and solution of system instability.