In this work a novel topology featuring an Indirect Matrix Converter (IMC) supplying a three-phase open-end load is proposed to allow multiple levels of voltage while reducing common mode voltages (CMV) at load terminals. The topology features a T-Type three phase inverter connected to the grid neutral terminal, allowing phase to phase or phase to neutral voltages to be supplied to the load. A comparison with the already known IMC open-end load scheme, based on two voltage source inverters (VSI), is performed achieving promising results in terms of Common Mode Voltage reduction at the load terminals, while achieving current waveforms with lower distortion. The improvement of CMV waveforms is useful for motor drives, reducing drive bearing currents and increasing overall lifespan.
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Alexandre Bento1,2,*, Ricardo Luís1,3, Sónia Pinto1,2, J. Fernando Silva1,2,
1INESC-ID Lisboa, Portugal
2DEEC, Instituto Superior Técnico, Universidade de Lisboa, Portugal
3Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Portugal
*Author to whom correspondence should be addressed.