The invention belongs to the technical field of novel power
system operation optimization, and particularly discloses a
power unit combination optimization method and
system based on rapid
frequency response of a
wind power plant. The method comprises the following steps: establishing a
system frequency response model considering a
wind power rapid
frequency response characteristic; taking the difference between the active step disturbance and the
wind power response power and the wind power slope exit power as the input of a system frequency
response model, and respectively obtaining the
time domain expressions of the lowest point of the first frequency drop and the lowest point of the second frequency drop; on the premise that the safe and stable operation constraint of the system is met, with the purpose of minimizing the operation cost, a unit commitment optimization model containing the frequency change constraint is constructed; and performing equivalent
processing on the nonlinear constraint, and solving the unit combination optimization model to obtain an optimal
power unit combination operation strategy. The method can give full play to the quick response performance of wind power, and gives full play to the adjustable capability of the wind power while coordinating with the synchronous
machine for
frequency modulation.