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A simple algorithm for 4-level inverter based on Space Vector PWM scheme is proposed. 4-level inversion is achieved by connecting a 3-level inverter and a 2-level inverter in open-end winding configuration. 3-level inverter is realized by cascaded connection of two 2-level inverters. The 3-level inverter is used to realize the sub hexagon center vector and 2-level inverter is used to realize the PWM...
A scheme for spreading the harmonic spectrum of Three-level Voltage Source Inverters is proposed in this paper. Space Vector based Sigma Delta Modulation is employed in the proposed scheme. The principle of Vector Quantization is applied for quantizing the reference Space Vector in the Sigma Delta Modulator. For the spatial quantization, the inverter voltage vector space is divided into different...
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