本章首先介绍了电网频率的静态特点与动态特点，分析了电网产生频率波动的原

This chapter first introduces the static and dynamic characteristics of power grid frequency, and analyzes the reasons for frequency fluctuations in the power grid. Aiming at frequency fluctuations, the method of system frequency adjustment is introduced, and the mechanism of frequency response is studied. On this basis, the analysis points out that a large number of doubly-fed induction wind turbines will affect the frequency adjustment of the system after being connected to the grid. Finally, the frequency characteristics of the doubly-fed induction wind generators are studied, and it is pointed out that the grid-connected doubly-fed induction wind generators will make the system As the moment of inertia is reduced, it is necessary to add a frequency control link to the doubly-fed induction wind turbine to convert the kinetic energy stored in the rotor into active power, provide certain active support for system frequency adjustment, and provide the control strategy proposed in the next chapter Theoretical basis.

This chapter first introduces the static and dynamic characteristics of the frequency of the power grid, and analyzes the causes of frequency fluctuations in the power grid. In view of frequency fluctuation, the method of system frequency regulation is introduced, and the mechanism of frequency response is studied. On this basis, the analysis points out that a large number of dual-feed induction wind turbines will affect the frequency regulation of the system, and finally studies the frequency characteristics of dual-feed induction wind turbines, and points out that the dual-feed induction wind turbine grid-connected will reduce the system rotation inertia, the need to increase the frequency control link of dual-feed induction wind turbines, so that the momentum stored in the rotor into a working power, the system frequency regulation provides a certain amount of effective support for the next chapter of the control strategy provides a theoretical basis.

This chapter first introduces the static and dynamic characteristics of power grid frequency, and analyzes the causes of frequency fluctuation. Aiming at the frequency fluctuation, the method of system frequency regulation is introduced, and the mechanism of frequency response is studied. On this basis, it is pointed out that a large number of doubly fed induction wind turbines will affect the frequency regulation of the system after grid connection. Finally, the frequency characteristics of doubly fed induction wind turbines are studied. It is pointed out that the system moment of inertia will be reduced after grid connection of doubly fed induction wind turbines. It is necessary to add a frequency control link to the doubly fed induction wind turbines to convert the kinetic energy stored in the rotor into active power It provides a certain active power support for the frequency regulation of the system, which provides a theoretical basis for the control strategy proposed in the next chapter.<br>