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Transient Characteristics and Quantitative Analysis of Electromotive Force for DFIG-based Wind Turbines during grid faults

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Chinese Journal of Electrical Engineering 2022年第2期8卷 3-12页

作者： Yumei Ma Donghai Zhu Xudong Zou Yong Kang Josep M.Guerrero Key Laboratory of Power Electronics and Energy Management for Ministry of Education of China Huazhong University of Science and TechnologyWuhan 430074China Department of Energy Technology Aalborg UniversityAalborg 9220Denmark

For doubly-fed induction generator(DFIG)-based wind turbines(WTs),various advanced control schemes have been proposed to achieve the low voltage ride through(LVRT)capability,whose parameters design is significantly reliant on the rotor electromotive force(EMF)of DFIG-based ***,the influence of the rotor current on EMF is usually ignored in existing studies,which cannot fully reflect the transient characteristics of *** tackle with this issue,this study presents a comprehensive and quantitative analysis of EMF during grid faults considering various control ***,the DFIG model under grid faults is ***,the transient characteristics of EMF are analyzed under different control modes(that is,rotor open-circuit and connected to converter).Furthermore,the EMF transient eigenvolumes(that is,accessorial resistance item,transient decay time constant,and frequency offset)are quantitatively analyzed with the typical parameters of MW-level DFIG-based *** analysis results contribute to the design of the LVRT control ***,the analysis is validated by the hardware-in-the-loop experiments.

关键词： Doubly-fed induction generator(DFIG) electromotive force(EMF) quantitative analysis transient characteristics wind turbines(WTs) grid faults

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Improving low-voltage ride-through capability of a multimegawatt DFIG based wind turbine under grid faults

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Protection and Control of Modern Power Systems 2020年第1期5卷 390-402页

作者： Mohamed Nadour Ahmed Essadki Tamou Nasser Research Center of Engineering and Health Science and Technologies(STIS) High Normal School of Technical Education(ENSET)Mohammed V UniversityRabatMorocco Research Center of Engineering and Health Science and Technologies Higher National School of Computer Science and Systems Analysis(ENSIAS)Mohammed V UniversityRabatMorocco

Large integration of doubly-fed induction generator(DFIG)based wind turbines(WTs)into power networks can have significant consequences for power system operation and the quality of the energy supplied due to their excessive sensitivity towards grid *** voltage dips,the resulting overcurrent and overvoltage in the rotor circuit and the DC link of a DFIG,could lead to the activation of the protection system and WT *** potentially results in sudden loss of several tens/hundreds of MWs of energy,and consequently intensifying the severity of the *** paper aims to combine the use of a crowbar protection circuit and a robust backstepping control strategy that takes into consideration of the dynamics of the magnetic flux,to improve DFIG’s Low-Voltage Ride Through capability and fulfill the latest grid code *** the power electronic interfaces are protected,the WTs also provide large reactive power during the fault to assist system voltage *** results using Matlab/Simulink demonstrate the effectiveness of the proposed strategy in terms of dynamic response and robustness against parametric variations.

关键词： Wind turbine DFIG grid faults Crowbar protection Backstepping control Low-voltage ride through

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