Dual-sliding mode control of nine-switch inverter

Abstract

This work introduces a novel dual-sliding mode control approach for nine-switch inverter topology. The nine-switch inverter helps regulate multiple ac-loads by using fewer semiconductor devices than the conventional two parallel voltage source inverter system. However, achieving independent control of two sets of ac loads is not a straightforward task when a nine-switch inverter feeds separate load stages. Regarding this consideration, a dual-sliding mode controller that includes a specific decision-making algorithm can be an efficient solution for a multi-load control problem. The proposed strategy offers a good compensation performance for the unconnected load stage under different load utilization profiles. The designed closed-loop system has a rapid response to sudden load change, and no unwanted interaction between individual load stages is observed. The detailed design steps and performance analyses are reported. Experimental results demonstrate the capability and usefulness of the proposed control strategy.