This paper presents a new transformer based multilevel inverter, with a novel pulse width modulation scheme to achieve seven-level inverter output voltage. The proposed inverter switching pattern consists of three fundamental frequency sinusoidal reference signals with an offset value, and one high frequency triangular carrier signal. This switching scheme has been implemented using an 8-bit Xi...

A multilevel inverter is a power electronic device made to synthesize a desired AC voltage from several levels of DC voltages. Some industrial drives require medium voltage and megawatt power level. For a medium voltage grid, it is troublesome to connect only one power semiconductor switch directly. A multilevel power converter structure has been introduced as an alternative in high power and m...

Received Apr 29, 2012 Revised Jan 7, 2013 Accepted Jan 24, 2013 Multilevel inverters can reach the increasing demand for power quality and power ratings along with lower harmonic distortion and lesser electromagnetic interference (EMI). As the number of levels increases, it is important to control more switches in parallel with their concurrent processing capability. In this paper space vector ...

The multi level inverters are mainly classified as Diode clamped, Flying capacitor inverter and cascaded multi level inverter. The cascaded H-bridge multilevel control method is very easy when compare to other multilevel inverter because it doesn‟t require any clamping diode and flying capacitor. The simulation had been carried for single leg of three phase three and five level Half-bridge modu...

Higher power levels can be obtained from utilizing lower voltage levels which was the theory proposed over thirty years ago. Conversion of DC to AC having desired output voltage and frequency can be obtained from two types of inverters which are single level and multilevel inverter (MLI). Amongst all MLI topologies, Cascaded H-Bridge type is taken into consideration for this paper. Advantages o...

Multilevel converters offer high power capability, associated with lower output harmonics and lower commutation losses. Their main disadvantage is their complexity, requiring a great number of power devices and passive components, and a rather complex control circuitry. This paper proposes a single-phase sevenlevel inverter for grid connected PV systems, with a novel pulse width-modulated (PWM)...

Recently, several numbers of multilevel inverter topologies have been presented that the numbers of power electronic devices have been reduced. This paper presents a novel single-phase topology for multilevel inverter. The proposed topology is based on cascaded connection of basic units. This topology uses minimum lumber of power electronic components such as IGBT, gate driver circuit and antip...

This paper presents a strategy for vector control of Permanent Magnet Synchronous Motor (PMSM) drive fed with a diode clamped multilevel inverter. In the proposed work the conventional 2-level inverter is replaced with three and five level inverters in PMSM drive system. The implementation of multilevel inverters improved the torque and speed response under various operating conditions. PI cont...

Multilevel inverter (MLI) has emerged as a key player in medium and high voltage application due to its tremendous popularity in reduced voltage stress across the power switches and low total harmonic distortion in output waveform. MLI requires large amount of power switches to perform conversion as compared to conventional converter. In MLI, as the number of levels increase number of switches ...