Method for controlling direct-drive wind power generation convertor

The invention relates to a method for controlling power generation equipment, in particular to a method for controlling a direct-drive wind power generation convertor. The method for controlling the convertor in a wind power generation system comprises the following steps: transforming positive-sequence coordinates d and negative-sequence coordinates q on the three-phase asymmetric voltage Ua, Ub and Uc and the three-phase current Ia, Ib and Ic of an electric network in the convertor of a wind motor group to obtain a voltage shaft component and a current shaft component along the shafts of a positive sequence d and a negative sequence q; then, removing secondary harmonics in the three-phase asymmetric voltage by filtration by a mathematical algorithm, decoupling the obtained voltage shaft direct-current component and the obtained current shaft direct-current component along the shafts of the positive sequence d and the negative sequence q to obtain a reference voltage vector and generating a control pulse signal by the reference voltage vector through a pulse width modulator so as to control the convertor to generate the corresponding voltage; and the invention has the advantages of high efficiency, low cost and higher response speed of the system, and a filtering device is replaced by the mathematical algorithm.