Virtual double-fed induction generator inertia control method coordinated with secondary frequency regulation

Abstract

The invention discloses a virtual double-fed induction generator inertia control method coordinated with secondary frequency regulation, which solves the problem of cooperation between the virtual inertia control of a wind turbine generator and the secondary frequency regulation of a power system. On the basis of an original virtual inertia control module, a module which is coordinated with the secondary frequency regulation of a power system is added, so that the overall frequency regulation effect is increased. Moreover, in the added module, the rotational speed of the rotor of the wind turbine generator is considered, so that the wind turbine generator can continuously operate within a safe rotational speed range; the problem of the affection of system frequency fluctuation on the active regulation capability of the wind turbine generator is solved; because the affection of system frequency fluctuation on the active regulation capability of the wind turbine generator is great, in order to ensure that the double-fed induction generator has better frequency regulation capability, the steady-state frequency response of the wind turbine generator is optimized, and moreover, accordingly, a control strategy is designed, so that the frequency regulation effect of the wind turbine generator is increased to a certain degree.

Description

Technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a virtual inertia control method for a doubly-fed wind turbine coordinated with secondary frequency modulation. Background technique [0002] Doubly-fed wind turbine (DFIG) is currently the main model of wind power generation. The DFIG rotor-side converter inputs a controllable variable frequency current to the rotor of the doubly-fed asynchronous generator through a slip ring. The grid-side converter is connected to the three-phase grid, and power exchange is realized between the rotor of the doubly-fed asynchronous generator and the grid through the DC link. The technology involved in this article is mainly the control technology of the rotor-side converter. The specific control objectives of the rotor-side converter are as follows: ①By controlling the torque / power, the rotor speed will always follow the most curve of the power, thereby achieving the maxi...

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Problems solved by technology

[0015] The technical problem to be solved by the present invention is to overcome the deficiency that the existing doubly-fed wind turbine virtual inertia control method is not coordinated with the secondary frequency modulation of the power system and does not consider the influence of frequency fluctuation on the active power regulation ability of the wind turbine

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