METHOD AND SYSTEM FOR CONTROLLING GRID-CONNECTED POWER CONVERTER

The invention provides a method for controlling a grid-connected power converter. The method comprises the steps: collecting three-phase alternating voltage and three-phase alternating current on a public power grid; taking the three-phase alternating-current voltage as a first input quantity of a reference current generator; collecting DC bus voltage on the DC side of a converter; observing the detected DC bus voltage through a reduced-order generalized proportional-integral observer RGPIO, wherein the obtained observed quantity is used as a second input quantity of a reference current generator; and taking the reference current output by the reference current generator and the acquired three-phase alternating current as the input of a resonance super-spiral sliding mode controller RST-SMC so as to generate a PWM signal for controlling the converter.