Transient Voltage Analysis for Hybrid Grid-Following and Grid-Forming Converters

With the integration of power electronic devices, the dynamic characteristics of power system have become increasingly complex. Renewable energy units are integrated into the grid through grid-following (GFL) and grid-forming (GFM) converters. In order to reveal the impact of hybrid GFL and GFM converters on transient voltage in renewable energy base, this paper analyzes the terminal voltage characteristics. Firstly, this paper simplifies the renewable energy base and proposes a formula for calculating terminal voltage. Next, this paper analyzes the impact of GFL converter parameters, GFM converter parameters, and the capacity ratio of GFL to GFM converters on terminal voltage. Then, we propose a calculation formula for the capacity configuration ratio of GFM converters in renewable energy bases. Finally, the theoretical analysis in this paper is verified.