Performance analysis of modeling scale on multiband oscillations in grid-connected wind farm

Frontiers in Energy Research

Energy Research

Min Xu¹  Mengjun Liao¹  Peiyan Hu²  Yue Wu²  Lin Zhu²  Leke Chen² 

[1] Electric Power Research Institute, China Southern Power Grid, Guangzhou, China;School of Electric Power Engineering, South China University of Technology, Guangzhou, China;

关键词: small-signal stability;    oscillation;    converter control;    permanent magnet synchronous generator (PMSG);    grid strength;    phase-locked loop (PLL);   

DOI  :  10.3389/fenrg.2023.1184119

 received in 2023-03-11, accepted in 2023-05-09,  发布年份 2023

来源: Frontiers

【 摘 要 】

Grid-connected permanent magnet synchronous generator (PMSG) wind farms may be susceptible to oscillation when connected to weak grids. This paper explores the root causes of the oscillations from two perspectives: the model and the oscillation frequency band. First, the small signal model of PMSG wind farm grid-side system is established, and the small disturbance comparison with the PMSGA full-order electromagnetic transient model in MATLAB/Simulink is carried out. Then, we calculatue the eigenvalues of the small signal model and use model analysis techniques such as participation factors calculation and root locus method to identify the critical factors that cause the oscillation modes to be dominant. Finally, time-domain simulation is used to verify the theoretical analysis. Two dominant modes are identified: the subsynchronous oscillation mode and the low-frequency oscillation mode. The subsynchronous oscillation mode is closely related to the direct current (DC) voltage control and the dynamics of DC link. The low-frequency oscillation is significantly weakened with the decrease in grid strength, and it is closely related to the phase-locked loop (PLL) control. The conclusions can provide a reference for tuning the control parameters of PMSG converter.

【 授权许可】

Unknown   
Copyright © 2023 Zhu, Chen, Hu, Wu, Liao and Xu.