Control method for variable-pitch wind power generation system and with primary frequency modulation function

The invention relates to a control method for a variable-pitch wind power generation system and with a primary frequency modulation function. The control method comprises the steps: the rated wind speed of the wind power generation system, the cut-in wind speed of the wind power generation system, the cut-out wind speed of the wind power generation system and the fan rotating frequency of the windpower generation system are determined, the frequency deviation is calculated, whether the frequency deviation is within a specified range or not is judged, the current rotation frequency of fan blades are increased or decreased according to a certain step length, and optimal power tracking is conducted; the on-site wind speed magnitude is judged, and the fan pitch angle beta is obtained according to the frequency change function F(x); and after participating in primary frequency modulation of the negative frequency difference class, searching for the optimal power is continued. Primary frequency modulation energy st