Parallel operation of SPWM inverters based on auto-master-slave technique

This paper presents a new control scheme: Auto\|Master\|Slave parallel operation technique of inverters. This control scheme can be used in large scale UPS systems and distributed power systems. With this control scheme the paralleled inverters can share linear or nonlinear load current. Based on DSP and high performance inverter modules which have inner filter capacitor current loops, an experiment system is built to verify this control scheme, and the results indicate that the inverters in parallel connection realize load current sharing. 