Research on Frequency Modulation Optimization Strategy for DFIG Stator Winding Inter-turn Short Circuit Fault
Research on frequency modulation optimization strategy for doubly fed induction generator(DFIG)stator winding inter-turn short circuit(SWITSC)fault is a common high-risk fault that causes sudden power changes in doubly fed wind turbines,leading to a decrease in system frequency.At the same time,due to the decoupling control between speed and frequency,it is difficult to provide dynamic support to the system during frequency fluctuations.To address the above issues,a composite frequency control strategy based on additional torque control was proposed.Firstly,a mathematical model of stator winding inter-turn short circuit fault was constructed,and the impact characteristics of the fault on frequency were analyzed;then,based on traditional frequency control methods,a composite inertial frequency control strategy based on an additional controller was put forward;finally,the performance characteristics of the proposed control strategy under stator winding inter-turn short circuit were verified through simulation platform.The results show that composite frequency control reduces the frequency change rate and frequency drift after stator winding inter-turn short circuit faults.Composite frequency control can provide dynamic frequency support under SWITSC,improve the frequency drop problem of weak power grid under inter-turn short circuit fault,and enhance the robustness of the system.
doubly-fed induction generatorstator winding inter-turn short circuit(SWITSC)frequency fluctuationadditional torquecomposite frequency control
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