Frequency-modulation method, device, equipment and medium of wind turbine generator system

Abstract

The invention discloses a frequency modulation method, a device, a device and a medium of a wind turbine generator system. Under the ultra-low wind speed mode, the frequency modulation is controlled by a flywheel energy storage frequency modulation control module. In the low wind speed mode, the flywheel energy storage module still participates in frequency modulation, the overspeed load sheddingcontrol in the integrated load shedding control module plays a role, and the droop control and virtual inertial control participate in frequency modulation. In medium wind speed mode, overspeed load shedding control and variable pitch control are used to control frequency modulation, sag control and virtual inertia control. In high wind speed mode, variable pitch control FM, droop control and virtual inertia control are used to control FM. Frequency modulation is realized by coordinating and coordinating all kinds of control links under different wind speed modes, so that the frequency of thepower network is stable.

Description

technical field [0001] The invention relates to the technical field of power system analysis, in particular to a method, device, equipment and medium for frequency regulation of wind turbines. Background technique [0002] Doubly-fed wind turbines are connected to the grid through converters, so that their active power output cannot respond to system frequency changes. When large-scale doubly-fed wind turbines without frequency regulation capabilities are connected to the grid, the frequency regulation capability of the system will be severely weakened. Therefore, it is necessary to make the doubly-fed wind turbine have a certain frequency regulation capability to improve the frequency stability of the power grid. [0003] The prior art basically improves the active power control link in the wind turbine so that the active output of the wind turbine can respond to system frequency changes. From the control principle, it is mainly divided into rotor kinetic energy control an...

AI Technical Summary

Problems solved by technology

Various control methods have their own advantages and disadvantages, and the applicable scenarios are also different

[0004] Although many scholars have conducted a lot of research on the mutual cooperation of various control methods, there are many and complex constraints when various strategies are used together, and how to adapt to complex operating conditions has not been resolved.

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