Multi-module master-slave parallel operation current sharing method under equivalent SVPWM (Space Vector Pulse Width Modulation)

The invention discloses a multi-module master-slave parallel operation current sharing method under equivalent SVPWM (Space Vector Pulse Width Modulation). The multi-module master-slave parallel operation current sharing method comprises the following steps: performing phase locking on each module to obtain wt of power grid voltage; calculating by the host to obtain a cubic zero-sequence component Uh3; the host superposes the calculated three-time zero-sequence components Uh3 to given values of A, B and C three-phase inverter voltage outer rings respectively; the host three-phase voltage outer loop outputs a three-phase current loop instruction Ixref by adopting proportional resonance and repetitive control; the host transmits the three-phase current loop Ixref to the slave through an optical fiber; the slave machine receives the three-phase current instruction Ixref, and then the master machine and the slave machine make a difference between the three-phase current instruction Ixref and three-phase inductive