Based converter parallel system circulating zero-sequence current deadbeat control method for suppressing

Suppression method based on circulation of zero sequence current deadbeat control the ever-changing flow parallel system, belonging to the technical field of control converter parallel system. It solves the changing flow parallel system, a plurality of current converters given different filter inductor and the AC side is not the same circulation suppressing dynamic response slow. It proposes a concept of virtual modules, that is, when the processing loop of the N parallel converter system, in which the N-1 parallel converter as a virtual module, and zero-sequence current in discrete mathematics based model, introduced involving multiple inverter SVPWM vector zero and non-zero vector duty cycle, and the AC-side filter inductor zero-sequence current deadbeat control with high dynamic response speed, without regard to DC bus voltage capacity, the system will be zero-sequence current sampling periods before the next reaches a given value 0. The present invention is applicable to the changing flow parallel circulation system suppression.