Z-source matrix converter with unity voltage transfer ratio

This paper proposes a novel Z-source matrix converter structure and a switching technique for unity voltage transfer ratio. The conventional matrix converter is well known for its advantages over a DC-linked back-to-back converter, but yet it does not receive much attention in the industry owing to its reduced voltage ratio (max. 0.866). To overcome the inherent drawback of the low voltage transfer ratio, a novel matrix converter topology employing a Z-source network is introduced, and then the operating principle and control scheme are clarified. A simulation of the overall system is carried out and theoretical calculations and feasibility of the proposed topology are verified. The results show that the proposed Z-source matrix converter can achieve unity voltage transfer ratio by controlling shoot-through zero interval (T₀) and the proposed switching strategy can effectively reduce the harmonic distortion of output waveforms.