Three-phase PWM rectifier model prediction control method for optical storage direct-flexible system

The invention discloses a three-phase PWM rectifier model prediction control method for an optical storage direct-current flexible system, which comprises the following steps of: subtracting a direct-current bus voltage reference value from a direct-current side voltage reference value, generating an active current reference value through a PI (Proportional Integral) controller, and setting a reactive current reference value to be 0 so as to ensure a unit power factor; performing conversion from a two-phase static coordinate system to a two-phase static coordinate system to generate an alpha-axis current reference value and a beta-axis current reference value under the two-phase static coordinate system; the action time of three different switching states in the switching sequence is calculated, and then the current of the next sampling period under the switching sequence is predicted; and optimizing the value function, finding out a group of switching sequences enabling the absolute value of the value functi