Method of supporting power grid frequency by grid-connected power electronic equipment

The invention discloses a method of supporting a power grid frequency by grid-connected power electronic equipment. The method comprises the following steps of: acquiring an angular frequency deviation signal obtained by PI control of a phase-locked loop of the grid-connected power electronic equipment in real time, enabling a feed-forward channel of the phase-locked loop based on the angular frequency deviation signal when the absolute value of the angular frequency deviation signal is greater than a threshold value to obtain a voltage instruction corresponding to the power grid frequency deviation value and the differential component and controlling the phase-locked loop to perform PI control based on the voltage instruction to obtain a coordinate transformation angle signal, and controlling the power electronic equipment to output active power to the power grid based on the coordinate transformation angle signal and realizing active support of the grid-connected power electronic equipment on the power grid