Dynamic Analysis of Uniformity and Difference for Grid-following and Grid-forming Voltage Source Converters Using Phasor and Topological Homology Methods  

作　　者：Haiyu Zhao Hongyu Zhou Wei Yao Qihang Zong Jinyu Wen 

机构地区：[1]State Key Laboratory of Advanced Electromagnetic Technology,School of Electrical and Electronics Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Modern Power Systems and Clean Energy》2025年第1期3-14,共12页现代电力系统与清洁能源学报(英文)

基　　金：supported by National Key R&D Program of China(No.2022YFB4202304)。

摘　　要：Grid-following voltage source converter(GFLVSC)and grid-forming voltage source converter(GFM-VSC)have different dynamic characteristics for active power-frequency and reactive power-voltage supports of the power grid.This paper aims to clarify and recognize the difference between gridfollowing(GFL)and grid-forming(GFM)frequency-voltage support more intuitively and clearly.Firstly,the phasor model considering circuit constraints is established based on the port circuit equations of the converter.It is revealed that the voltage and active power linearly correspond to the horizontal and vertical axes in the phasor space referenced to the grid voltage phasor.Secondly,based on topological homology,GFL and GFM controls are transformed and mapped into different trajectories.The topological similarity of the characteristic curves for GFL and GFM controls is the essential cause of their uniformity.Based on the above model,it is indicated that GFL-VSC and GFM-VSC possess uniformity with regard to active power response,type of coupling,and phasor trajectory.They differ in synchronization,power coupling mechanisms,dynamics,and active power-voltage operation domain in the quasi-steady state.Case studies are undertaken on GFL-VSC and GFM-VSC integrated into a four-machine two-area system.Simulation results verify that the dynamic uniformity and difference of GFL-VSC and GFM-VSC are intuitively and comprehensively revealed.

关 键 词：Renewable energy grid-following converter grid-forming converter phasor method topological homology 

分 类 号：TM46[电气工程—电器]