Low-frequency Oscillations and Resonance Analysis of VSG-controlled PMSG-based Wind Generation Systems  

作　　者：Yizhuo Ma Jin Xu Chenxiang Gao Guojie Li Keyou Wang 

机构地区：[1]Key Laboratory of Control of Power Transmission and Conversion Ministry of Education,Shanghai Jiao Tong University,Shanghai,China

出　　处：《Journal of Modern Power Systems and Clean Energy》2025年第1期115-127,共13页现代电力系统与清洁能源学报(英文)

基　　金：supported in part by the National Key R&D Program of China(No.2022YFE0105200);in part by the State Grid Zhejiang Electric Power Company Science and Technology Program(No.5211JX230004)。

摘　　要：With good adaptability to weak power grids,the grid-forming inverter becomes the foundation of future power grids with high-proportion renewable energy.Moreover,the virtual synchronous generator(VSG)control is recognized as the mainstream control strategy for grid-forming inverters.For permanent magnet synchronous generator(PMSG)based wind generation systems connected to power grid via VSG-controlled grid-forming inverters,some novel impacts on the low-frequency oscillations(LFOs)emerge in power grids.The first impact involves the negative/positive damping effect on LFOs.In this paper,the small-signal torque model of VSG-controlled PMSGbased wind generation systems is established based on the damping torque analysis method,revealing the influence mechanism of machine-side dynamics on LFOs and proving the necessity of the double-mass model for accurate stability analysis.The second impact is the resonance effect between torsional oscillation and LFOs.Subsequently,this paper uses the open-loop resonance analysis method to study the resonance mechanism and to predict the root trajectory.Then,a damping enhancement strategy is proposed to weaken and eliminate the negative damping effect of machine-side dynamics on LFOs and the resonance effect between torsional oscillation and LFOs.Finally,the analysis result is validated through a case study involving the connection of the VSG-controlled PMSG-based wind generation system to the IEEE 39-bus AC grid,supporting the industrial application and stable operation of VSG-controlled PMSGbased wind generation systems.

关 键 词：Grid-forming inverter low-frequency oscillation(LFO) modal resonance permanent magnet synchronous generator(PMSG) torsional oscillation virtual synchronous generator(VSG). 

分 类 号：TM614[电气工程—电力系统及自动化]