Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Stability investigation of phase disturbances in doubly-fed wind power systems using phase-locked synchronization

  • Wei Chen (School of Electrical Engineering, Xinjiang University) ;
  • Shan He (School of Electrical Engineering, Xinjiang University) ;
  • Jing Cheng (School of Electrical Engineering, Xinjiang University) ;
  • Zhi Yuan (School of Electrical Engineering, Xinjiang University) ;
  • Xueqin Yan (School of Electrical Engineering, Xinjiang University)
  • Received : 2022.03.23
  • Accepted : 2022.09.05
  • Published : 2023.02.20
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Abstract

Under weak grid conditions, there is a strong nonlinear coupling between phase-locked loops (PLLs) and the doubly-fed induction generators (DFIGs), and the influence of its dynamic characteristics on system stability cannot be ignored. For a system to be stable, the dynamic properties must be considered. First, based on instantaneous power theory, the sub-synchronous frequency component of power oscillation in a three-phase symmetrical system with the participation of a PLL is deduced. Second, the PLL transient stability is studied under two power grid structures. Third, to connect with the power grid model, a DFIG with a PLL structure is established, and the phase disturbance of the PLL is used as the excitation signal. In the rotor current inner loop and the voltage outer loop transfer processes, the PLL phase disturbance component plays a role. A d-axis structure block diagram of the current loop with the PLL phase disturbance component is constructed, and the disturbance transfer function is deduced. The influence mechanism of the PLL control parameters on system power oscillation is investigated. Finally, the modeling simulation verifies the validity of the theoretical analysis.

Keywords

Acknowledgement

This work was supported by the Xinjiang Education Department Key Project under grant XJEDU2021I010, Key R & D projects of Xinjiang Uygur Autonomous Region under grant 2022B01003-3, Open Project of Xinjiang Uygur Autonomous Region Key Laboratory under grant 2020D04048 and Natural Science Foundation of China under grant 51767024.

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