Abstract
In this article, a novel Z(AC)-source single-phase ac-ac converter with high buck and boost voltage conversion capability is introduced. The proposed topology utilizes the Z(AC)-source network to regulate the frequency and magnitude of the output voltage. The proposed converter operates in buck mode when the duty cycle lies between 0 and 0.33, and boost mode when the duty cycle lies between 0.33 and 1. The switching control strategy is discussed and the proposed converter provides a feature to control the magnitude and frequency of the output voltage independently. Employment of capacitors in the outer closed loop results in a highly consistent operation characterized by inherent soft commutation capability, removal of the source shoot-through risk, and enhanced input current waveform quality. Due to these advantages, it can be applied to the adjustable speed drives and traction systems. The control code is executed in dSPACE 1006 embedded with field-programmable gate array (FPGA) dS5203 board and the performance of the proposed converter is tested experimentally. The obtained experimental results are provided which validates the theoretical analysis and performance of the proposed converter.