Modeling of Grid-Connected DFIG-Based Wind Turbines for DC-Link Voltage Stability Analysis


The electromagnetic stability problems of the grid-connected doubly fed induction generator (DFIG) system are usually overlooked. This paper presents a reduced order small-signal model that can be used to research the soundness of DFIGs dc-link voltage control system, especially under weak ac grid conditions. This model neglects DFIG flux and quick current control dynamics. But, the effects of operating points, grid strengths and management loops interactions on system dynamic performance are taken into consideration. An eigenvalue comparison shows the proposed model holds dominant oscillation mode featured by the detailed model and is appropriate for stability analysis of dc-link voltage management system of DFIG. Influence coefficients reflecting control loops interactions are presented. Application studies of the proposed model show it is appropriate for illustrating the result of grid strength on dynamic performance of the DFIGs dc-link voltage control system. Meanwhile, section-locked loop (PLL) and rotor-side converter (RSC) active power control (APC)/reactive power controls (RPC) result on system stability are explored.

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