Method and device for distributing active power for wind farm

A device for distributing active power for a wind farm, comprising:

• a total active power variation calculation unit, implemented by a processor executing a computer program stored in a memory, being configured to calculate a current total active power variation of the wind farm according to a current frequency variation of a power grid;
• a single-unit active power variation distribution unit, implemented by the processor executing the computer program stored in the memory, being configured to:
• distribute a current single-unit active power variation to each wind turbine according to a first preset strategy based on the current total active power variation and a single-unit storage energy value of each wind turbine in the wind farm in a case that the current total active power variation of the wind farm is greater than zero, and to distribute the current single-unit active power variation to each wind turbine according to the first preset strategy based on the current total active power variation and a lowerable power value of each wind turbine in the wind farm in a case that the current total active power variation of the wind farm is smaller than zero;
• and
• an operating state adjustment unit, implemented by the processor executing the computer program stored in the memory, being configured to control each wind turbine to adjust its operating state according to the distributed current single-unit active power variation,
• wherein the single-unit active power variation distribution unit comprises:
• a single-unit storage energy value ranking module, implemented by the processor executing the computer program stored in the memory, being configured to acquire the single-unit storage energy value of each wind turbine in the wind farm, and rank the single-unit storage energy values of all wind turbines in an ascending order;
• an average active power calculation module, implemented by the processor executing the computer program stored in the memory, being configured to calculate a value of a current undistributed total active power variation divided by a quantity of undistributed wind turbines, to serve as undistributed average active power;
• a single-unit storage energy value determination module, implemented by the processor executing the computer program stored in the memory, being configured to determine whether the single-unit storage energy values are smaller than the undistributed average active power in sequence in an ascending order;
• and
• a first single-unit active power variation distribution module, implemented by the processor executing the computer program stored in the memory, being configured to distribute to a wind turbine a current single-unit active power variation, that is equal to a single-unit storage energy value thereof, in a case that the single-unit storage energy value is smaller than the undistributed average active power, and to distribute to the wind turbine a current single-unit active power variation, that is equal to the undistributed average active power, in a case that the single-unit storage energy value is greater than or equal to the undistributed average active power.