Control of single switch inverters

Abstract

This paper presents a control approach for a single switch inverter. The inverter exhibits non-minimum phase behavior in some of the operating modes. A dual feedforward controller was employed with an adaptive PI controller to obtain perfect tracking performance. The controller successfully isolates the non-minimum phase part of the system from the minimum phase. Both separated minimum phase and non-minimum phase sub-systems were used in the dual feedforward scheme to generate desired references. The non-minimum phase dynamics are transformed to minimum phase by using an inverse system transfer function as parallel compensator. The adaptive PI controller was used to track the voltage references.