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

doi:10.3969/j.issn.2097-0706.2024.06.010

Abstract

Abstract:

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.

Key words: grid-connected inverter, impedance modeling, wide frequency oscillation, weak power network, stability analysis

CLC Number:

TM712：TK01

ZHUO Chaoran, XIN Jie, HONG Hanzhuo, AN Bang, LI Ning. Review on impedance modeling of grid-connected inverters under weak grid conditions[J]. Integrated Intelligent Energy, 2024, 46(6): 88-101.

Figures/Tables 12

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