Novel three Phase Quasi Z source Multilevel Inverter Topology forWind Turbine Driven Permanent Magnet Generator [articol]

Abstract

This paper presents the utilization of multilevel inverter that has been designed to reduce the circuit complexity and optimizing the use of bidirectional switches. A new three phase Quasi Z source multilevel inverter (QZS-MLI) for direct drive wind turbine generator applications has been proposed. The proposed inverter consists of an auxiliary circuit, made up of inductor and capacitor network and 5 bidirectional switches along with the full bridge inverter configuration. The proposed QZSMLI is able to produce 7 levels of staircase waveforms with only 2 shared power switches. The output voltage is similar to the conventional multilevel inverters but with less power switches and THD. A modified carrier based level shifted pulse width modulation control strategy has also been developed. The performance of the proposed inverter is analyzed through MATLAB/SIMULINK and the results are verified with experimental setup.