Design and Development of a Novel 19-Level Inverter Using an Effective Fundamental Switching Strategy

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Abstract
This paper presents a single phase 19-level inverter with less number of switching components, leading to reduce the cost and enhance reliability for renewable applications. The anticipated multilevel inverter has two bridges generate quasi-square and seven level uneven waveforms with an equal magnitude steps. Two voltage waveforms are cascaded at secondary side of transformers to create nineteen level output voltage waveform. Further, to find the appropriate switching instants of the proposed configuration, a new fundamental switching method named as fundamental sine quantized switching technique (FSQST) is presented. In fact, it has the capacity to provide N number of switching instants with less computational efforts, and attains optimized Total Harmonic Distortion (THD) in the output voltage. Finally, performance of the proposed topology is validated with simulations and hardware setup.

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