弱电网条件下并网逆变器阻抗模型的建立方法综述

Review on impedance modeling of grid-connected inverters under weak grid conditions

阻抗分析法已经成为研究并网逆变器与电网交互系统稳定性的重要手段,为深入研究该问题,回顾了并网逆变器的2种控制模式,其次分析了阻抗建模对于电力系统的稳定性及抑制宽频振荡的重要意义,为解决新型电力系统宽频稳定问题提供理论基础,并详细讨论了dq线性化、谐波线性化的阻抗建模的分析方法以及基于神经网络的并网逆变器阻抗模型辨识方法。通过对比以上方法的应用特点,为实际应用中建模方法提供了理论依据;总结了现有电力电子化系统并网逆变器阻抗建模的优势、挑战,并对其未来研究方向进行了展望,对提高交互系统的稳定性提供了参考指导。

The impedance analysis method has become an important means of studying the stability of the interaction system between grid-connected inverters and the power grid.To make further investigations,two control modes for grid-connected inverters are reviewed,and the impact of impedance modeling on the power system stability and broadband oscillation suppression are analyzed,providing a theoretical basis for solving the broadband stability problem in new power systems.Then,grid-connected inverters′impedance modeling methods including dq linearization,harmonic linearization,as well as the impedance model identification method based on neural networks are expounded.The comparison on the modeling methods facilitates their practical applications.The summaries on the advantages,challenges and opportunities of impedance modeling methods for grid-connected inverters in existing power electronic systems provide guidance for improving the stability of the interaction system.