A method and system for controlling power of a wind turbine group

Abstract

The invention discloses a wind power generator group control method and system. The wind power generator group control method comprises the following steps: establishing and initializing a population adapted to the scale of a wind power generator group in advance to obtain an initial population; determining a penalty function of each wind power generator unit by utilizing a penalty function determining formula; calculating a target function value of each individual by utilizing a target function value calculation formula; carrying out population evolution treatment on the initial population based on a differential evolution algorithm and in combination with the target function value of each individual until converging to obtain a global optimal individual; and according to the global optimal individual, correspondingly controlling the wind power generator group so as to control a blade pitch angle of each wind power generator unit and the frequency of a variable-frequency alternating-current bus. According to the wind power generator group control method and system, wind power loss quantity in the control process of the wind power generator group can be reduced, and the phenomenon that the output power of the wind power generator group exceeds a rated power value can be prevented.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and system for controlling the power of a wind turbine group. Background technique [0002] Offshore wind power has the advantages of high wind speed, low turbulence intensity, and stable wind speed and direction, and is the main trend of the development of the wind power industry. If the wind turbine cluster control is used to replace the single-unit discrete control, it will help reduce the failure rate, thereby reducing offshore maintenance work, increasing effective power generation time, and reducing the total system cost. However, when the wind speed distribution in the wind farm is uneven, the control of wind turbine clusters will easily lead to a large wind energy loss, and the output power will easily exceed the rated power value. How to reduce the wind energy loss in the process of wind turbine cluster control under the condition of uneven wind sp...

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Problems solved by technology

However, when the wind speed distribution in the wind farm is uneven, the control of wind turbine clusters will easily lead to a large wind energy loss, and the output power will easily exceed the rated power value. How to reduce the wind energy loss in the process of wind turbine cluster control under the condition of uneven wind speed distribution To measure and avoid the output power of wind turbines exceeding the rated power value is a problem that needs to be further solved

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