Performance Analysis of Discontinuous Pulse Width Modulation Schemes on PUC-5 Inverter

Considerable research is being carried out on the effect of the choice of PWM scheme on inverter performance. Discontinuous PWM schemes, initially developed by “Depenbrock” in 1977, has become one of the most promising modern PWM methods. This modulation scheme is also known as “Depenbrock PWM” scheme. In this paper the discontinuous modulation schemes are applied on the recently introduced five level Packed U-Cell (PUC-5) inverter. The THD index, common mode voltage (CMV) and utilization of DC link voltage are analyzed as they are important parameters of a typical inverter. To control theses parameters and output voltage, PWM is a best option for it. A comprehensive analysis of these modulation schemes are shown on the basis of the output THD and common mode voltage applied for PUC-5 inverter. A single phase prototype model is also presented which is used for validation of the concept.

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