Delta and Adaptive delta modulated single phase AC/AC converter

Abstract

A single phase AC/AC converter (SPAAC) employing Insulated-gate bipolar transistors (IGBTs) is proposed, where undesirable harmonics are reduced using Delta modulation (DM) and Adaptive delta modulation (ADM) techniques. This converter not only works as a Cyclo-inverter (CI) but also as a Cyclo-converter (CC). The comparative performance analysis is done for DM and ADM techniques using output voltage and associated Total harmonic distortion (THD) waveform son MATLAB/Simulink platform for different mode of operations. Simulated results for CI demonstrate that the minimum THD is approximately 5.2% for DMand3.3% for ADM at output frequency, f 0 = 1 kHz whereas it is less than 1% for both (DM and ADM)at output frequency, f 0 = 100 Hz. For CC, the minimum THD values are 1.13, 1.10% for DM and 0.93, 0.92% for ADM at output frequencies, f 0 = 25 and 5 Hz respectively. Though, the performance of both the modulation techniques is comparable for CI at lower output frequencies, yet on the whole ADM outperforms DM.