A controller and method

The present invention discloses a method and a controller, comprising: a collector for real-time data acquisition reactive power and voltage data, a processor for reactive power and voltage data to input the preset data in the model to predict, to give a certain period reactive power data prediction value and the voltage data prediction value and the time adjuster for limiting the reactive power and the voltage is adjusted based on the reactive power prediction value and the voltage data prediction value, reactive power and voltage after the adjusted limit, based on a control command to the controller limits of reactive power and the voltage after the adjustment, the regulator according to the control instruction for adjusting the grid voltage, the controller adjusts the value of the reactive power according to forecast data and the predictive value of the data voltage voltage and reactive power limits and limiting the reactive power according to the voltage and the trigger controller issues control commands, and adjust the grid voltage according to the control command, such grid voltage within the acceptable range.