2024年3月5日 · This letter proposes an adaptive hybrid grid-following (GFL) and grid-forming (GFM) control, which ensures small-signal stability of inverter-based resources with ultra-weak and very strong grid connections. The hybrid control offers mixed GFL and GFM characteristics by altering the grid synchronization and outer loop controls.

2024年6月1日 · In this study, we explored small-signal stability of islanded microgrids with hybrid GFM sources based on SMs and converters, with a particular emphasis on the effects of control methods and their interactions on stability in 9 scenarios involving the synchronous machines, GFL and GFM converters.

2024年11月1日 · In this paper, the small-signal stability of a hybrid system with GFM and GFL inverters is investigated. Based on the idea of admittance decomposition, this paper first decomposes the overall admittance of two inverters into several sub-admittances corresponding to different control loops and circuit components.

In this paper, we will demonstrate that only GFM converters can provide effective voltage source behavior and enhance the power grid strength in terms of small signal dynamics. Based on our analysis, we further study the problem of how to configure GFM converters in the grid and how many GFM converters we will need.

2024年10月1日 · A unified small-signal model and impedance stability analysis for grid-forming (GFM) and grid-following (GFL) converters under identical topology and parameters. Analysis of the stability and delineation of stability domains for GFM and GFL converters across varying short circuit ratios (SCRs).

2024年10月11日 · This paper explores the damping effect of a grid-forming (GFM) converter on the small-signal stability of a grid-following (GFL) converter during weak grid configurations. The paralleled operation of GFL and GFM converters is considered in this work.

2025年2月11日 · Recent reports have highlighted small-signal synchronous instability issues in grid-following converter-based renewable energy generation systems connected to weak power grids. This study introduces a Koopman operator-based approach for system state prediction and small-signal synchronization stability enhancement through a data-driven strategy.

2023年9月28日 · Therefore, this paper compares the basic principles and control methods of converters based on GFM strategy and GFL strategy, establishes the small-signal model of 100% REI system, and comparatively analyzes the dynamic characteristics of GFM and GFL converters.

This paper focuses on small-signal stability and conducts a comprehensive analysis of GFM and GFL controls, with emphasis on the interactions between synchronous generators (SGs) and IBRs. The detailed modelings of GFM and GFL inverters as well as SGs are established.

In this paper, a small-signal synchronization stability enhance-ment approach of GFL-based REG is proposed. The main contributions are twofold: We propose a method for system identification and prediction that combines the delay embedding technique with the Koop-man operator.