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AssigneeNorth China Electric Power University
InventorsTianshu Bi, Cheng Wang, Jiahao Liu, Guoyi Xu
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A method implemented in a power grid including a DFIG wind turbine is provided. The method includes: assuming the DFIG wind turbine to be operated in a MPPT mode; generating a simplified transient model of the DFIG wind turbine, the simplified transient model including an equivalent circuit model, and an equivalent rotor motion model in a nonlinear form; linearizing the equivalent rotor motion model in the nonlinear form to be an equivalent rotor motion model in a linear form with respect to a steady-state operating point of the DFIG wind turbine; and determining a first contribution and a second contribution of the DFIG wind turbines to a post-disturbance frequency of the power grid, in a center of inertia (COI) frequency frame and in a frequency spatial variation frame, respectively, by incorporating the simplified transient model of the DFIG wind turbine into a frequency dynamics analysis.
A method of power system frequency dynamics analysis implemented in a power grid including a doubly-fed induction generator (DFIG) wind turbine, wherein the DFIG wind turbine includes a doubly-fed induction machine (DFIM), a wind turbine, and proportional-integral (PI) controllers configured for a maximum power point tracking (MPPT) control module, a phase-locked loop (PLL) module, an active power control loop module, and an reactive power control loop module, the method comprising:
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