Method and system for controlling a wind turbine group

Abstract

The invention discloses a wind power unit group control method and system. The method comprises the steps of pre-establishing and initializing a particle swarm matched with the scale of a wind power unit group to obtain a target particle swarm; utilizing a penalty function determination formula for determining a penalty function of each wind power unit; utilizing a fitness calculation formula for calculating a fitness value of each particle; utilizing the position and the fitness value of each particle for performing iteration updating on the speed and position of each particle to obtain a global optimum particle; according to the global optimum particle, correspondingly controlling the wind power unit group so as to control the pitch angle of each wind power unit and the frequency of a frequency conversion alternate-current bus. The wind energy loss amount in the wind power unit group controlling process is decreased, the phenomenon that the output power of the wind power units is larger than a rated power value can be avoided, and safe and stable operation of the wind power system is promoted.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and system for controlling 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 speed distribut...

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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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