A wind farm power control method

Abstract

The invention discloses a wind farm power control method. The method comprises the following steps of S1. calculating power deviation according to a given power grid scheduling power and a wind farm measured power, and determining to perform power raising control or power reducing control; S2. detecting wind turbine states; S3. detecting standby time and running time under continuously limited power of each wind turbine; S4. calculating power raising margin of a wind turbine in the standby state under limited power in real time according to actual power and wind speed; S5. ranking priorities;S6. in power reducing control, classifying the wind turbines into three groups and preprocessing; S7. in power raising control, classifying and preprocessing the wind turbines, S8. controlling runningstates of all wind turbines in the wind farm according to a preprocessing result; and S9. controlling rotating speed through a pitch PI controller. The wind farm power control method controls the wind farm power accurately and reduces wind turbine load, in addition, a single wind turbine adopts a close loop power control method, so that the power of the single wind turbine is controlled accurately.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a power control method of a wind farm. Background technique [0002] As domestic wind power has gone through a big development cycle, especially the capacity of centralized wind farms is getting bigger and bigger, and the proportion of their grid-connected capacity is also increasing, and their impact on the dynamic image of the power grid cannot be ignored. In order to ensure the stable operation of the power grid, the wind farms connected to the power grid are required to have power regulation capabilities, and the requirements for regulation accuracy are getting higher and higher. At present, relevant literature and patents at home and abroad have studied this requirement. For example: the document "Active Power Control Strategy of Wind Farm Based on Unit Status Classification" introduces a power control method based on the status of wind turbines, classifies the wind turb...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned patents have the following deficiencies and problems: 1) only combined start-stop control, without power control for a single unit, and the control accuracy is difficult to guarantee; 2) the optimization goal is simply to quickly approach the given power, which is likely to cause frequent start-stop Or the problem that the running time of each unit is seriously unbalanced; 3) The implementation process of the genetic algorithm is relatively complicated

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