Method for anticipation protection and energy regulation of full-power wind turbine generator under symmetrical grid failure

Abstract

The invention provides a method for anticipation protection and energy regulation of a full-power wind turbine generator under symmetrical grid failure, wherein the method comprises a step for judging whether the wind turbine generator is to be protect by calculating the relationship among current air speed V, rated air speed Ve, safe air speed Vs, declination depth K of grid voltage U and safetycurrent I of a converter; the method also can be used for replenishing electric power of the grid. The method for anticipation protection and energy regulation of a full-power wind turbine generator under symmetrical grid failure provided by the invention has the advantage that the electric energy can be stored, discharged and controlled safely and etc.

Description

technical field The invention relates to the field of safe operation control of an asynchronous full-power wind power generating set, in particular to a method for predicting voltage ride-through and protection and energy regulation of a full-power wind power generating set when a symmetrical fault occurs in a power grid. Background technique In the past 10 years, the world's wind power industry has grown rapidly at an average annual rate of 28%, becoming the fastest growing renewable energy. With the continuous increase of the scale of wind power generation and the single unit capacity of wind turbines, the proportion of total wind power generation in the entire power system is also increasing. When the proportion of wind power generation is small in the past, once the power grid fails, the grid-connected wind turbines can be directly disconnected to realize the protection of the unit, and the impact on the power grid can be ignored. However, when the proportion of wind po...

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