Converter control method, controller and power grid power conversion system

The embodiment of the invention provides a control method of a converter, a controller and a power grid power conversion system. The method is applied to a converter which is used for converting electric energy of a power transmission network. The method comprises the following steps: acquiring power data of a converter; the electric power data are processed through a pre-built converter control model, control data of the converter are obtained, the control data are used for controlling the operation state of the converter, and the converter control model is obtained through discretization of a state observer model built through the electric power parameters of the filter and the parameter variation of the converter. The method is used for achieving the effect of improving the control performance of the converter.