Control of AC-DC matrix converter using digital PLL

In this paper, the implementation of a DSP controlled ac-dc matrix converter is presented. A Phase Locked Loop is used to synchronize the high frequency ac voltage synthesized by the matrix converter with the three phase input line. This solution allows obtaining a stable output dc voltage even in case of non ideal input phases, which is the typical actual input in an industrial environment. Experimental results, obtained with a 5 kW prototype and compared with computer simulated model results, are shown. Functional issues are discussed and design solutions proposed and implemented.