Switching Modulation Strategies for Multilevel Inverter

CHAPTER 3 NOVEL MODULATION TECHNIQUES for MULTILEVEL INVERTER and HYBRID MULTILEVEL INVERTER

Minimization of Switching Losses for Diode Clamped Multilevel Inverter

Multilevel inverters are emerging as a most promising alternative for reducing the harmonics and to achieve high-voltage, high-power capability but switching losses are increased because of increased device count. Many modulation techniques like soft switching techniques, space vector-based PWM techniques or sinusoidal PWM-based techniques were employed to reduce the switching losses. In this p...

Comparative Study of Constant Switching Frequency and Variable Switching Frequency Multicarrier Pulse width Modulation for Three Phase Cascaded Multilevel Inverter

This Paper Presents a comparative study of Constant Switching frequency Multicarrier Pulse width Modulation and Variable Switching frequency Multicarrier Pulse width Modulation. The emergence of Multilevel converter has been in increase since the last decade . These new type of converters are suitable in high voltage & high power application due to their ability to synthesize waveforms with bet...

An Improved Modulation Strategy for a Hybrid Multilevel Inverter

Multilevel cascaded and hybrid inverter systems conventionally use three level bipolar PWM for each individual inverter, with their carriers phase shifted to achieve maximum harmonic cancellation within each phase leg. This has been shown to give a harmonic performance equivalent to APOD modulation of a NPC multilevel inverter, when the switching frequencies are scaled to achieve the same numbe...

Analysis of Control Strategies for Diode Clamped Multilevel Inverter

This paper presents the comparison of various Pulse Width Modulation (PWM) strategies for the three phase Diode Clamped Multi Level Inverter (DCMLI). The main contribution of this paper is the proposal of new modulation schemes with Variable Amplitude (VA) and various new schemes adopting the constant switching frequency and also variable switching frequency multicarrier control freedom degree ...