METHOD AND SYSTEM OF PARALLEL CONTROL FOR SINGLE-PHASE INVERTERS AND INVERTER

摘要

FIELD: electrical engineering.;SUBSTANCE: invention relates to the field of electrical engineering, in particular to a parallel control method and a parallel control system for single-phase inverters. The method includes: obtaining an output voltage and an output current of a single-phase inverter; by recovering and transforming coordinates, transforming voltage and current in a static coordinate system abc into a coordinate system dq and performing voltage and current decoupling; the implementation of the coordinate transformation for the command value of the output voltage of the current loop; converting the dq output voltage command value to the abc coordinate system; and generating a modulated wave for switching control of the power device according to the abc output voltage command value. A plurality of single-phase inverters are controlled to be run in parallel at the same time. If a malfunction occurs on a single-phase inverter, any other single-phase inverter automatically takes over its load, thereby eliminating the problem associated with a delay in restarting the backup module; uninterrupted power supply is realized in the full sense; reliability is high and there is no negative impact on movement.;EFFECT: improving the reliability of power continuity.;12 cl, 6 dwg