High-voltage crossing control method and device under imbalanced sudden rise of power grid voltage

Abstract

The invention provides a high-voltage crossing control method and device under an imbalanced sudden rise of a power grid voltage, wherein the method comprises the steps of: detecting voltage effective values of three power grid lines at a grid connection side of a wind generating set in real time when imbalanced sudden rise of the power grid voltage occurs; if the difference between at least one of the voltage effective values of three power grid lines at the grid connection side and a power grid voltage set value is detected to be higher than a preset threshold, then calculating a reference reactive current value according to the maximum value in the three detected voltage effective values, and calculating an active current value according to the reference reactive current value; and if the calculated active current value is smaller than an active current set value input at the grid connection side at present, then using the calculated reference reactive current value as a reactive current value input at the grid connection side, and using the calculated active current value as an active current set value input at the grid connection side. According to the invention, the wind generating set is enabled to have the fault ride-through capability under the imbalanced sudden rise of the power grid voltage.

Description

technical field [0001] The invention relates to the technical field of wind power generating sets, in particular to a control method and device for high-voltage ride-through under unbalanced power grid voltage surge. Background technique [0002] Among various types of wind turbines, the direct-drive wind turbine (PermanentMagnetSynchronousGenerator, PMSG) is currently one of the mainstream models of megawatt-scale wind turbines. Large-scale wind power bases are generally far away from the load center, and their power needs to be transmitted to the load center through long distances and high voltage for consumption. With the continuous expansion of the single unit capacity of wind turbines and the scale of wind farms, when the grid fails, if the wind turbines are disconnected from the grid, they cannot provide frequency and voltage support for the grid in the event of a grid failure like conventional energy generation. , it is likely to cause a serious chain reaction and ha...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a control method for high voltage ride-through when the unbalanced grid voltage rises suddenly, so as to solve the technical problem in the prior art that the wind power generating set will run off-grid during the grid voltage unbalanced surge period, the method include:

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