Modeling and Transient Stability Analysis of Mixed-GFM-GFL-Based Power System

Mingfei Li, Xiangjun Quan, Zaijun Wu, Wei Li, Ling Zhu, Qinran Hu

20212021 IEEE Sustainable Power and Energy Conference (iSPEC)19 citationsDOI

Abstract

The transient stability mechanism of grid-following inverter (GFL-inverter) and grid-forming inverter (GFM-inverter) in the power system has been extensively studied respectively, whereas the integration of GFM-inverters and GFL-inverters into the grid unavoidably change the transient stability of the power system. This paper aims to analyze the transient stability for the mixed-GFM-GFL power system (MGGPS). The equilibrium point of the MGGPS system is analyzed. The large-signal model of the system is established. Based on this model, an analysis of the transient stability is carried out. It is revealed that the change of GFM-inverter terminal voltage will move the position of GFL-inverter equilibrium points, and the increase of GFL-inverter terminal current will enhance the transient stability of GFM-inverter. With the simulation of phase portraits, the aforementioned transient stability mechanism is proved.

Topics & Concepts

InverterTransient (computer programming)Control theory (sociology)Stability (learning theory)Power (physics)Phase portraitComputer scienceEquilibrium pointPhysicsBifurcationArtificial intelligenceDifferential equationNonlinear systemControl (management)Machine learningQuantum mechanicsOperating systemMicrogrid Control and OptimizationIslanding Detection in Power SystemsHVDC Systems and Fault Protection