CONTROL METHOD FOR OUTPUTTING ACTIVE POWER THROUGH GRID-CONNECTED ELECTRICITY GENERATION OF WIND POWER PLANT

摘要

A control method for outputting active power through grid-connected electricity generation of a wind power plant, belonging to the technical field of grid-connected control of wind power plants. The present invention comprises: firstly, establishing a relationship between a power P_W which may be currently generated by a wind power plant and a fluctuating power P_RES which needs to be abandoned to suppress fluctuation, so as to obtain the fluctuating value required to suppress an active power; in accordance with the requirement of a power grid for the fluctuating amplitude of different wind power plants in different time periods, determining a time constant T of a first-order low-pass filter, determining a sampling interval t, and further discretizing same in a time domain to obtain a stabilization parameter α; concluding the single-machine control of the wind power plant as a target-adjustable integral control policy; and obtaining an adjustable active power target value adapted to the power grid. The load can be rationally distributed in accordance with the target value through the coordinated control of the wind power plant. The self-protection of a draught fan is also changed from passive adjustment of an oar or a splitting type to an active preventing type, thereby not only effectively improving the operation efficiency of the draught fan, but also reducing the impact on the power grid and protecting the operation of the draught fan.