Stability Evaluation and Frequency Drift Analysis of Sub-Synchronous Oscillation in Grid-Connected PMSG Wind Turbines

IF 2.6 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Iet Generation Transmission & Distribution Pub Date : 2025-06-05 DOI:10.1049/gtd2.70100

Gangui Yan, Cheng Yang, Yupeng Wang, Lin Yue, Fu Guo

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Abstract

The sub-synchronous oscillation (SSO) in grid-connected permanent magnet synchronous generators (PMSG) is a complex dynamic behaviour influenced by multiple factors. The phenomenon of SSO has the characteristic of frequency drift. Previous studies have mainly focused on the SSO stability, without further explanation of the reasons for frequency drift in SSO. In this paper, a SISO transfer function model is constructed to analyse the SSO characteristics of grid-connected PMSG. The study quantitatively analyses the impacts of grid strength, operating conditions and voltage/current control parameters on system stability and oscillation frequency based on amplitude/phase margin. It reveals the triggering mechanism of SSO instability in weak grid strength and characterises the constraining relationship between grid strength/operating conditions and the stable operational region of the system. The results demonstrate that variations in SSO frequency are predominantly influenced by control parameter settings, with a measurable variation range of up to 26.7 Hz. Finally, the effectiveness of the proposed model and the theoretical analysis results are verified through simulations.

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并网PMSG风力发电机组次同步振荡稳定性评价及频率漂移分析

并网永磁同步发电机的次同步振荡是一个受多种因素影响的复杂动力学行为。单点阵现象具有频率漂移的特点。以往的研究主要集中在单点登录稳定性上，没有进一步解释单点登录频率漂移的原因。为了分析并网PMSG的单点登录特性，建立了单点登录传递函数模型。基于幅相裕度定量分析了电网强度、运行工况和电压/电流控制参数对系统稳定性和振荡频率的影响。揭示了弱电网强度下单点登录失稳的触发机制，刻画了电网强度/运行条件与系统稳定运行区域之间的约束关系。结果表明，单点登录频率的变化主要受控制参数设置的影响，可测量的变化范围高达26.7 Hz。最后，通过仿真验证了所提模型和理论分析结果的有效性。

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来源期刊

Iet Generation Transmission & Distribution 工程技术-工程：电子与电气

CiteScore

6.10

自引率

12.00%

发文量

301

审稿时长

5.4 months

期刊介绍： IET Generation, Transmission & Distribution is intended as a forum for the publication and discussion of current practice and future developments in electric power generation, transmission and distribution. Practical papers in which examples of good present practice can be described and disseminated are particularly sought. Papers of high technical merit relying on mathematical arguments and computation will be considered, but authors are asked to relegate, as far as possible, the details of analysis to an appendix. The scope of IET Generation, Transmission & Distribution includes the following: Design of transmission and distribution systems Operation and control of power generation Power system management, planning and economics Power system operation, protection and control Power system measurement and modelling Computer applications and computational intelligence in power flexible AC or DC transmission systems Special Issues. Current Call for papers: Next Generation of Synchrophasor-based Power System Monitoring, Operation and Control - https://digital-library.theiet.org/files/IET_GTD_CFP_NGSPSMOC.pdf