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    Real-time Simulation of No-load Grid-connection Based on dSPACE Doubly-Fed Wind Power Generation System
    2022 IEEE 6th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC ) (2019)
    Ning WangJing WangPengfei ZhanSiyu WangJin Gao
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    Abstract:
    As a flexible grid-connection method, idle-load grid-connection is widely used in AC excitation variable speed constant frequency (VSCF) wind power generation systems with Doubly-Fed Induction Generator (DFIG). In this paper, the idle-load grid-connection control strategy of the VSCF doubly-fed wind turbine is designed. Under the condition of open circuit on the stator side, the rotor exciting current is adjusted to realize VSCF at the stator side while decoupling the output active power and reactive power. Finally, a semi-physical real-time simulation platform of doubly-fed wind power generation system based on dSPACE is established. As a result, there was no inrush current at the time of grid-connection, which verified the correctness of the control strategy, at the same time, accuracy and real-time of the control system were proved.
    Keywords:
    Grid connection
    Decoupling (probability)
    DSPACE
    Idle
    Inrush current
    Topics:
    Real-time simulation and control systems
    Wind Turbine Control Systems
    Multilevel Inverters and Converters
    The simulation of idle grid-connection control system based on VSCF-DFIG
    Journal of Inner Mongolia University of Science and Technology (2011)
    Song Xiong-tao
    VSCF-DFIG is an advanced,highly efficient wind power generation system.According to DFIG principle,the DFIG mathemaical model of idle grid-connection was established and the VSCF-DFIG controlled strategy was analyzed.In MATLAB/SIMULINK simulation platform,a simulation model was validated by simulation.The simulation results show that the model can correctly reflect the characteristics of the idle grid-connection and has great significance for the study of idle grid-connection.
    Idle
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    Methodology for Smooth Connection of Doubly Fed Induction Generators to the Grid
    IEEE Transactions on Energy Conversion (2009)
    G. TapiaG.T. SantamariaMaria TelleriaAna Susperregui
    A systematic methodology for smooth connection of wind-turbine-driven doubly fed induction generators (DFIGs) to the grid is presented. Synchronization of the voltage induced in the DFIG open stator to that of the grid, which needs to be accomplished prior to connection, is thoroughly examined. A particular grid-voltage-oriented rotor control scheme is considered for this purpose. Generic tuning equations for the rotor current integral–proportional (I-P) controllers involved in this scheme are also derived. Transition between the control configurations devoted to synchronization and normal operation—active power generation and reactive power interchange with the grid—at the instant of connection is studied in detail. Mainly due to the reference frame selected for synchronization, the greater part of this transition takes place naturally. However, given that the rotor current dynamics vary significantly depending on whether the DFIG stator is connected to the grid or not, the parameters of the I-P controllers involved in both schemes will accordingly be different. Consequently, a "bumpless" strategy is provided that preserves the smoothness of the connection. A simple method for initial rotor positioning, required when performing vector control based on an incremental encoder, is also suggested. The resulting overall methodology is validated on a 7-kW DFIG-based laboratory-scale test bench.
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    Lang Yong-qiang
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