This paper presents the comparison of various multicarrier Pulse Width Modulation (PWM) techniques for the Cascaded Hybrid Multi Level Inverter (CHBMLI). Due to switch combination redundancies, there are certain degrees of freedom to generate the five level AC output voltage. This paper presents the use of Control Freedom Degree (CFD) combination. The effectiveness of the PWM strategies develop...

In this paper, hybrid modulation methods suitable for H-bridge MLI are discussed. The results of experimental work using dSPACE system only are presented for three phase five level cascaded type inverter. Different hybrid carrier PWM (Pulse Width Modulation) strategies using sinusoidal reference, third harmonic injection reference, 60 degree reference and stepped wave reference for the chosen i...

A voltage source inverter is commonly used to supply a three-phase induction motor with variable frequency and variable voltage for variable speed applications. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. The different methods for PWM generation can be broadly classified into Triangle comparison based PWM ...

Soft Switcing techniques have recently been applied in the design of dc-ac converters, in order to achive better performance, higher efficiency, and power density. One of the soft switching techniques uesd in inverters is resonant dc links. These topologies have some disadvantages such as irregular current peaks, large voltage peaks, uncotrollble pulse width, etc. Another soft switching method ...

A multilevel inverter have become more popular over the year. multilevel inverter can eliminate the need for the step-up transformer and reduce the harmonics produced by the inverter. Although the multilevel inverter structure was initially introduced as a means of reducing the output waveform harmonic content, it was found that the dc bus voltage could be increased beyond the voltage rating of...

The rapid evolution of renewable energy within the last several years has resulted in the design of efficient power converters appropriate for medium and high-power applications such as wind turbine and photovoltaic (PV) systems. A new group of multilevel inverters has introduced as a solution for working with higher voltage levels. Besides this important feature, multilevel converters have the...

A PWM technique is used to achieve the low total harmonic distortion (THD) at the output of inverter during the construction of pulses to the converter switches. By using PWM modulation techniques we can minimize harmonics generated by the PWM technique itself. First, we present converter topology characteristics with PWM techniques. Then we describe how a suggested modulation minimizes harmoni...

In order to improve the quality of the billet continuous casting, a two-phase orthogonal power supply (TPOPS) for electromagnetic stirrer is researched, which is composed of three-phase PWM rectifier and three-leg inverter. According to the power analysis of system, the ripple of dc-link voltage is analyzed and its analytical expression is derived. In order to improve the performance of electro...

In this paper, a simplified space–vector pulse width modulation technique for multilevel inverters is proposed. This method is based on the simplification of the space–vector diagram of a five level inverter into that of a three level inverter. In turn, the three level inverter space vector diagram is simplified into that of two level inverter. Hence, the algorithm of five level space-vector pu...

This paper presents a three level NPC LCswitched voltage source inverter. Conventional multilevel voltage source inverter behaves like voltage step down converter. Recently multilevel buck-boost Z-source inverter (ZSI) has been developed for better efficiency and power quality in renewable energy system. The impedance network of the Z-source inverter requires equal inductors and equal capacitor...