A novel multiple output grid-connected inverter based on DSP control

A novel DSP-based multiple output grid-connected inverter is proposed in this paper. Compared to conventional grid-connected inverter, the proposed grid-connected inverter can output various voltages by cascading or parallel connection of two inverters and with digital signal processor (DSP) control. Stability and relative stability of the grid-connected inverter are unaffected in these two operation modes. Load current of these two inverters at parallel operation mode and load voltage of both at cascading operation mode can be shared. Operation principle and control strategy are analyzed in detail. A 1 kVA DSP-based cascading and parallel combined dual-buck half-bridge inverter has been established and tested. Experimental results verify the theoretical analysis.